CN107453838B

CN107453838B - Data frame header sending method and sending device

Info

Publication number: CN107453838B
Application number: CN201611051709.XA
Authority: CN
Inventors: 李东声
Original assignee: Tendyron Corp
Current assignee: Tendyron Corp
Priority date: 2016-11-24
Filing date: 2016-11-24
Publication date: 2020-08-21
Anticipated expiration: 2036-11-24
Also published as: CN107453838A

Abstract

The invention discloses a data frame header sending method and a sending device, wherein the data frame header sending method comprises the following steps: acquiring N waveform sequences corresponding to a preset data frame header, wherein each waveform sequence is one of the following sequences: a first waveform sequence, a second waveform sequence, and a third waveform sequence, each waveform sequence having the following characteristics: the transmission duration of each waveform sequence is the same, the high level of the first waveform sequence starts to jump to the low level after lasting for a first preset time, the high level of the second waveform sequence continues to the high level, the high level of the third waveform sequence starts to jump to the low level after lasting for a second preset time, and the first preset time is different from the second preset time; obtaining X level jumps in the N waveform sequences according to the characteristics of each waveform sequence, wherein the X level jumps are all changed from high level jumps to low level jumps; and controlling the level of the sending port to change according to the X level jumps so as to send the data frame header.

Description

Data frame header sending method and sending device

Technical Field

The present invention relates to the field of electronic technologies, and in particular, to a method and a device for sending a data frame header.

Background

The serial communication mode between electronic devices is usually that one character is transmitted one by one, each character is transmitted one by one, and when one character is transmitted, the transmission always starts with a "start bit" and ends with a "stop bit", and there is no fixed time interval requirement between characters. When two electronic devices communicate, a sending clock of a sending end and a receiving clock of a receiving end may be different, and when the frequency difference between the sending clock and the receiving clock is too large, sampling dislocation of the receiving end is caused, so that receiving errors are caused, and communication efficiency is reduced.

In addition, when communication between electronic devices is performed using only two wires, power supply/charging cannot be performed during communication, and another power supply needs to be externally connected, which causes great inconvenience to the use of the electronic devices.

Disclosure of Invention

The present invention is directed to solving the above problems.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

the invention mainly aims to provide a method for sending a data frame header, which comprises the following steps: acquiring N waveform sequences corresponding to a preset data frame header, wherein N is a positive integer, and each waveform sequence in the N waveform sequences is one of the following sequences: a first waveform sequence, a second waveform sequence, and a third waveform sequence, wherein the first waveform sequence, the second waveform sequence, and the third waveform sequence have the following waveform sequence characteristics: the transmission durations of the first waveform sequence, the second waveform sequence and the third waveform sequence are the same, the first waveform sequence starts from a high level and jumps to a low level after lasting for a first preset time, the second waveform sequence continues to the high level within the transmission duration, the third waveform sequence starts from the high level and jumps to the low level after lasting for a second preset time, wherein the durations of the first preset time and the second preset time are different; obtaining X level jumps in the N waveform sequences according to the waveform sequence characteristics of each waveform sequence in the N waveform sequences, wherein X is a positive integer and is greater than 1, and the X level jumps from a high level jump to a low level; and controlling the level of the sending port to change according to X level jumps in the N waveform sequences so as to send the data frame header.

Further, the waveform sequence is characterized by: the transmission duration and the baud rate of transmitting the waveform sequence are in an inverse proportion relation, the first waveform sequence is ended at a high level, and the total duration of a low level appearing in the first waveform sequence in the transmission duration is not changed along with the change of the baud rate of transmitting the waveform sequence; and/or the third waveform sequence ends with a high level, and the total duration of the low level appearing in the third waveform sequence in the transmission duration does not change with the change of the baud rate of transmitting the waveform sequence.

Further, the waveform sequence is characterized by: the total duration of the low levels appearing in the first waveform sequence within the transmission duration is less than one-half of the duration; and/or the total duration of the low levels appearing in the third waveform sequence in the transmission duration is less than one half of the duration.

Further, the waveform sequence is characterized by: t1 ═ a × T, where T1 is the first preset time, T is the transmission duration, a is a preset duty cycle coefficient, and 0< a < 1; t2 ═ b × T, where T2 is the second preset time, b is a preset duty cycle coefficient, and b is 0 or more and 1 or less; and, a ≠ b.

Further, the waveform sequence is characterized by: the second preset time is equal to 0, and the third waveform sequence has only one level jump from low level to high level within the transmission duration and is ended with high level; the first waveform sequence starts at a high level and occurs only once a transition from a high level to a low level within the transmission duration in case the first waveform sequence ends at a high level, or starts at a high level and occurs only once a transition from a high level to a low level within the transmission duration and ends at a low level in case the first waveform sequence ends at a low level.

In addition, the N waveform sequences at least comprise M waveform sequences, and the M waveform sequences are the first M waveform sequences in the N waveform sequences, wherein M is a positive integer and is more than or equal to 2; the M waveform sequences consist of the first waveform sequence; or, the M waveform sequences consist of the third waveform sequence; alternatively, the M waveform sequences include at least one first waveform sequence and at least one third waveform sequence.

Further, when the M waveform sequences are composed of the first waveform sequence, the N waveform sequences further include: at least 1 interference rejection waveform sequence following the M waveform sequences, wherein the at least 1 interference rejection waveform sequence is the second waveform sequence or the third waveform sequence; when the M waveform sequences consist of the third waveform sequence, the N waveform sequences further include: at least 1 interference rejection waveform sequence following the M waveform sequences, wherein the at least 1 interference rejection waveform sequence is the second waveform sequence or the first waveform sequence.

Further, N is 8, and the N waveform sequences are the third waveform sequence, the second waveform sequence, and the third waveform sequence in this order.

Another main object of the present invention is to provide a transmission apparatus, including: a waveform sequence obtaining module, configured to obtain N waveform sequences corresponding to a preset data frame header, where N is a positive integer, and each of the N waveform sequences is one of the following: a first waveform sequence, a second waveform sequence, and a third waveform sequence, wherein the first waveform sequence, the second waveform sequence, and the third waveform sequence have the following waveform sequence characteristics: the transmission durations of the first waveform sequence, the second waveform sequence and the third waveform sequence are the same, the first waveform sequence starts from a high level and jumps to a low level after lasting for a first preset time, the second waveform sequence continues to the high level within the transmission duration, the third waveform sequence starts from the high level and jumps to the low level after lasting for a second preset time, wherein the durations of the first preset time and the second preset time are different; obtaining X level jumps in the N waveform sequences according to the waveform sequence characteristics of each waveform sequence in the N waveform sequences, wherein X is a positive integer and is greater than 1, and the X level jumps from a high level jump to a low level; and the sending module is used for controlling the level of the sending port to change according to the X level jumps in the N waveform sequences so as to send the data frame header.

Further, the waveform sequence is characterized by: t1 ═ a × T, where T1 is the first preset time, T is the transmission duration, a is a preset duty cycle coefficient, and 0< a < 1; t2 ═ b × T, where T2 is the second preset time, b is a preset duty cycle coefficient, and b is 0 or more and less than 1; and, a ≠ b.

In addition, the N waveform sequences at least include M waveform sequences, where M is a positive integer and M is greater than or equal to 2, and the M waveform sequences are the first M waveform sequences of the N waveform sequences corresponding to the preset data frame header; the M waveform sequences consist of the first waveform sequence; or, the M waveform sequences consist of the third waveform sequence; alternatively, the M waveform sequences include at least one first waveform sequence and at least one third waveform sequence.

According to the technical scheme provided by the invention, the data frame header sending method and the sending device can control the sending port to carry out level change according to the obtained level jump to send the data frame header by obtaining the waveform sequence corresponding to the preset data frame header and the corresponding level jump, so that the receiving device can obtain the transmission duration time through the data frame header, and the sending end and the receiving end can ensure that the values of the transmission duration time are consistent during each data transmission. In addition, the sending end and the receiving end can only use two lines to complete data receiving and sending, and power supply/charging between the two devices is completed simultaneously in the data receiving and sending process, and the high level ratio in the waveform sequence during data transmission is higher, so that the power supply/charging efficiency is greatly improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1A is a flowchart of a transmission parameter obtaining method according to embodiment 1 of the present invention;

FIG. 1B is a diagram illustrating various waveform sequences provided in example 1 of the present invention;

FIG. 1C is a diagram illustrating a predetermined waveform sequence according to an alternative embodiment of the present invention provided in example 1;

fig. 1D is a schematic diagram of a detected level jump in an alternative embodiment provided in embodiment 1 of the present invention;

fig. 1e (a) is a schematic diagram of a first waveform sequence according to an alternative embodiment provided in example 1 of the present invention;

fig. 1e (b) is a schematic diagram of a first waveform sequence and a third waveform sequence according to an alternative embodiment provided in example 1 of the present invention;

fig. 1F is a schematic diagram of another first waveform sequence and a third waveform sequence according to an alternative embodiment of the present invention, provided in example 1;

fig. 1G is a schematic diagram of the first M waveform sequences of the alternative implementation provided in example 1 of the present invention, which are composed of the first waveform sequence;

fig. 1H is a schematic diagram of the first M waveform sequences including a first waveform sequence and a third waveform sequence according to the alternative embodiment provided in example 1 of the present invention;

fig. 1I is a schematic diagram of a waveform sequence of N-8 according to embodiment 1 of the present invention;

fig. 2A is a schematic structural diagram of a terminal according to embodiment 2 of the present invention;

FIG. 2B is a diagram illustrating various waveform sequences provided in embodiment 2 of the present invention;

FIG. 2C is a diagram illustrating a preset waveform sequence according to an alternative embodiment of the present invention provided in example 2;

fig. 2D is a diagram illustrating a detected level jump according to an alternative embodiment of the present invention, which is provided in embodiment 2;

fig. 3A is a flowchart of a method for sending a data frame header according to embodiment 3 of the present invention;

FIG. 3B is a diagram illustrating various waveform sequences provided in embodiment 3 of the present invention;

fig. 3C is a schematic diagram of a waveform sequence corresponding to a preset data frame header according to an alternative embodiment of the present invention in embodiment 3;

fig. 3d (a) is a schematic diagram of a first waveform sequence according to an alternative embodiment provided in example 3 of the present invention;

fig. 3d (b) is a schematic diagram of a first waveform sequence and a third waveform sequence according to an alternative embodiment of the present invention provided in example 1;

fig. 3E is a schematic diagram of another first waveform sequence and a third waveform sequence according to an alternative embodiment of example 3 of the present invention;

fig. 3F is a schematic diagram of a waveform sequence of N-8 according to embodiment 3 of the present invention;

fig. 4A is a schematic structural diagram of a transmitting apparatus according to embodiment 4 of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or quantity or location.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

Example 1

The embodiment provides a transmission parameter acquisition method, which can be applied to communication between a master device and a slave device. The device for acquiring the transmission parameters may be a slave device or a master device. The device as the master device may be, for example, a terminal, and the device as the slave device may be, for example, an electronic payment device (e.g., an electronic signature tool key, a smart card, a key-engaging device, etc.).

Fig. 1A is a flowchart of a transmission parameter obtaining method according to an embodiment of the present invention, and as shown in fig. 1A, the transmission parameter obtaining method according to the embodiment mainly includes the following steps:

step 101, obtaining waveform sequence characteristics of N waveform sequences formed by X preset level jumps, where N is a positive integer, X is a positive integer and greater than 1, and each waveform sequence in the N waveform sequences formed by the X preset level jumps is one of the following: the first waveform sequence, the second waveform sequence and the third waveform sequence are characterized in that: the transmission duration time T of the first waveform sequence, the transmission duration time T of the second waveform sequence, and the transmission duration time T of the third waveform sequence are the same, and the first waveform sequence starts with a high level and jumps to a low level after lasting for a first preset time T1, the second waveform sequence lasts for a high level within the transmission duration time T, and the third waveform sequence starts with a high level and jumps to a low level after lasting for a second preset time T2, wherein the first preset time T1 is different from the second preset time T2 in duration, and all the preset X level jumps from a high level to a low level.

In this embodiment, as shown in fig. 1B, the first waveform sequence may exist in various ways, for example: starting with a high level, jumping to a low level after lasting for a first preset time T1, and finally ending with the low level; or, starting with a high level, jumping to a low level after a first preset time, and finally ending with a high level. That is, the present embodiment only defines the first waveform sequence starting with a high level and jumping to a low level after lasting for the first preset time T1, and there is no specific limitation on what level the first waveform sequence ends. The third waveform sequence can exist in a variety of ways: starting with a high level, jumping to a low level after lasting for a second preset time T2, and finally ending with the low level; or starts with a high level, makes a transition to a low level after lasting for a second preset time T2, and finally ends with a high level. That is, the present embodiment only limits the level at which the third waveform sequence starts at the high level and transitions to the low level after the second predetermined time T2, and is not limited in any way as to what level the third waveform sequence ends. The first preset time T1 is different from the second preset time T2 in duration, so that the data receiving apparatus can determine whether the waveform sequence corresponding to the received level change is the first waveform sequence or the third waveform sequence according to the duration of the high level before the high level of each waveform sequence jumps to the low level.

In this step, for example, when X is 4, N is 5, and 5 waveform sequences are preset as a first waveform sequence, a second waveform sequence, and a third waveform sequence (where the first waveform sequence starts at a high level, transitions to a low level after a first preset time, and ends at a low level, the third waveform sequence starts at a high level, transitions to a low level after a second preset time, and ends at a low level, for example), the waveform sequence characteristics of the 5 waveform sequences formed by the preset 4 level transitions are obtained as shown in fig. 1C, that is: after the high level lasts for T1 time, the high level jumps to the low level (first jump), after T-T1, the low level returns to the high level, after the high level lasts for T1 time, the low level jumps to the low level (second jump), after T-T1, the low level jumps to the high level (third jump) after the high level lasts for T1 time, after T-T1, the low level returns to the high level, after the high level lasts for T2 time, the low level jumps to the low level (fourth jump), and after the low level lasts for T-T2 time.

And 102, continuously detecting X level jumps on a receiving port, wherein all the continuously detected X level jumps are changed from a high level to a low level.

In this step, the device for receiving data, which detects level jump, may continuously sample the level of the receiving port to obtain the level change of the receiving port, and the sampling frequency used in the sampling should be higher than the preset minimum standard, so as to ensure the authenticity of the level change of the receiving port obtained by sampling, and also only obtain the time when the level jump of the receiving port changes into the high level jump or into the low level.

And 103, calculating the transmission duration of a waveform sequence according to the waveform sequence characteristics of N waveform sequences formed by the preset X level jumps and the time interval between any two level jumps in the continuously detected X level jumps.

In this step, for example, X is 4, N is 5, and the continuously detected 4 level jumps are as shown in fig. 1D, the transmission duration of one waveform sequence can be calculated according to the waveform sequence characteristics of 5 waveform sequences formed by the preset 4 level jumps obtained in step 101 and the time interval between any two level jumps, for example, as shown in fig. 1C, the time interval between the first jump and the second jump is T-T1+ T1, i.e., the transmission duration of one waveform sequence, the time interval between the first jump and the third jump is T-T1+ T1+ T1+ T1 is 2T, i.e., the transmission duration of two waveform sequences, the time interval between the third jump and the fourth jump is T-T1+ T2, and in the case that the proportional relationship between T1, T2 and T is known, i.e. the transmission duration of a sequence of waveforms can be calculated.

In the embodiment, the transmission duration of one waveform sequence is calculated by using the time interval between the same hopping moments, and the method is simple in calculation mode, easy to operate and high in accuracy.

In an optional implementation manner of this embodiment, between step 102 and step 103, step 102a may further be included:

and judging whether each time interval of all the continuously detected X level jumps conforms to the same preset relation with the corresponding time interval of all the X level jumps contained in the N waveform sequences formed by the preset X level jumps or not, and if so, calculating the transmission duration of one waveform sequence according to the waveform sequence characteristics of the N waveform sequences formed by the preset X level jumps and the time interval between any two continuously detected X level jumps. As shown in fig. 1D and 1C, when N is 5 and X is 4, it is determined whether each of all time intervals (shown in fig. 1D) of the detected 4 level transitions and corresponding time intervals (shown in fig. 1C) of all the preset 4 level transitions conform to the same preset relationship, where the same preset relationship is: for example, the time interval between the detected first level jump and the second level jump is 50ns, the time interval between the preset first level jump and the second level jump is 100ns, and the time interval between the detected level jump and the preset corresponding jump is 0.5 times of the time interval; the time interval between the detected second level jump and the detected third level jump is 50ns, the time interval between the preset second level jump and the preset third level jump is 100ns, and the time interval between the detected level jump and the preset corresponding jump is 0.5 times of the time interval; that is, the time interval between the detected W-th level jump and the W + 1-th (where W is a positive integer and W +1 is less than or equal to X) level jump is 0.5 times of the preset time interval between the W-th level jump and the W + 1-th level jump; the time interval between the detected first level jump and the detected third level jump is 100ns, the time interval between the preset first level jump and the preset third level jump is 200ns, the time interval between the detected level jump and the preset corresponding jump is 0.5 times of the relationship, namely the time interval between the detected Y level jump and the Y +2 (wherein, Y is a positive integer, and Y +1 is less than or equal to X) level jump is 0.5 times of the relationship with the time interval between the preset Y level jump and the Y +2 level jump; by analogy, when the time intervals of all detected level jumps and the time intervals of the preset corresponding jumps are 0.5 times of the relationship, the same preset relationship can be regarded, and it can be determined that the continuously transmitted 5 waveform sequences are the 5 waveform sequences corresponding to the preset data frame header. When whether each time interval of all the continuously detected X level jumps conforms to the same preset relationship with the corresponding time interval of all the X level jumps in the N waveform sequences formed by the preset X level jumps, the continuously detected X level jumps can be determined as a data frame header, the transmission duration of one waveform sequence is calculated after the data frame header is determined, the calculation accuracy of the transmission duration can be guaranteed, and the transmission efficiency is improved.

In an optional implementation of this embodiment, the waveform sequence further includes: the transmission duration and the baud rate of the transmission waveform sequence are in inverse proportion, the first waveform sequence is ended by a high level, and the total duration of a low level appearing in the first waveform sequence in the transmission duration does not change along with the change of the baud rate of the transmission waveform sequence; and/or the third waveform sequence ends with a high level, and the total time length of the low level appearing in the third waveform sequence in the transmission duration time does not change along with the change of the baud rate of the transmission waveform sequence. For example, taking the first waveform sequence as an example, when the baud rate is 50Mbps, the transmission duration of the first waveform sequence is 20ns, and when the baud rate is 25Mbps, the transmission duration of the first waveform sequence is 40ns, i.e., the transmission duration is in inverse proportion to the baud rate of the transmission waveform sequence, the longer the transmission duration, the smaller the baud rate, i.e., the lower the transmission speed, and the shorter the transmission duration, the larger the baud rate, i.e., the higher the transmission speed.

The total duration of the low level appearing in the first waveform sequence in the transmission duration does not change with the change of the baud rate of the transmission waveform sequence, that is, as shown in fig. 1e (a), when the baud rate of the first waveform sequence is 50Mbps, the transmission duration of the first waveform sequence is 20ns, the duration of the low level is 8ns, when the baud rate is 25Mbps, the transmission duration of the first waveform sequence is 40ns, and the duration of the low level is still 8 ns. The total duration of the low level appearing in the third waveform sequence in the transmission duration does not change with the change of the baud rate of the transmission waveform sequence, namely when the baud rate of the third waveform sequence is 50Mbps, the transmission duration of the third waveform sequence is 20ns, the duration of the low level is 8ns, when the baud rate is 25Mbps, the transmission duration of the third waveform sequence is 40ns, and the duration of the low level is still 8 ns. Under the condition that data transmission and power supply are carried out simultaneously, the shorter the time of the total time length occupied by the low-level duration time is, the longer the power supply or power taking duration time is in the data transmission process, namely under the condition that the baud rate is 50Mbps, the transmission duration time of the first waveform sequence or the third waveform sequence is 20ns, the duration time of the low level is 8ns, the power supply or power taking duration time of the first waveform sequence or the third waveform sequence is 60%, under the condition that the baud rate is 25Mbps, the transmission duration time of the first waveform sequence or the third waveform sequence is 40ns, the duration time of the low level is 8ns, and the power supply or power taking duration time of the first waveform sequence or the third waveform sequence is 80%, namely under the condition that the duration time of the low level is fixed, the lower the baud rate is, the higher the power supply or power taking efficiency is, and the baud rate can be properly reduced for improving the power supply efficiency.

In an optional implementation of this embodiment: the time length occupied by the low level of the first waveform sequence in the transmission duration is variable time length, namely the total time length occupied by the low level in the transmission duration is not fixed and is variable time length irrelevant to the change of the baud rate; the duration of the low level of the third waveform sequence in the transmission duration is variable, that is, the total duration of the low level in the transmission duration is not fixed, and is a variable duration independent of the change of the baud rate. For example, as shown in fig. 1e (b), when the baud rate is not changed, the first waveform sequence starts at a high level, transitions to a low level after a first preset time T1, ends at a high level or a low level after a low level continues for a variable time, starts at a high level, transitions to a low level after a second preset time T2, and ends at a high level after a low level continues for a variable time. The low level duration is variable, the sending waveform sequence and the receiving waveform sequence are more flexible on the premise of not influencing the accurate calculation of the transmission duration, the requirement on the accuracy of hardware equipment is also reduced, and the application range of the scheme is wider.

In an optional implementation manner of this embodiment, the waveform sequence further includes: the total duration of the low level appearing in the first waveform sequence in the transmission duration is less than one half of the duration; and/or the low levels present in the third waveform sequence occupy less than half of the duration of the transmission. Under the condition that data transmission and power supply are carried out simultaneously, the shorter the total duration occupied by the low-level duration time is, the longer the power supply or power taking duration is in the data transmission process, and the higher the power supply/power taking efficiency is.

In an optional implementation manner of this embodiment, the waveform sequence further includes: t1 ═ a × T, where T1 is a first preset time, T is a transmission duration, a is a preset duty cycle coefficient, and 0< a < 1; t2 ═ b × T, where T2 is a second preset time, b is a preset duty cycle coefficient, and b is 0 or more and b < 1; and, a ≠ b. For example, when the duration is 20ns, if a is 0.5, T1 is 10ns, and if b is 0.25, T2 is 5 ns. and a and b are different, so that the waveforms of the first waveform sequence and the third waveform sequence are different in characteristics, and the data receiving equipment is ensured not to be confused during data receiving.

In an optional implementation manner of this embodiment, the waveform sequence further includes: that is, as shown in fig. 1F, the second duration T2 is equal to 0, and the third waveform sequence has only one level jump from low level to high level within the transmission duration and ends with high level; the first waveform sequence starts at a high level and occurs only once a transition from a high level to a low level within the transmission duration in the case where the first waveform sequence ends at a high level, or starts at a high level and occurs only once a transition from a high level to a low level within the transmission duration and ends at a low level in the case where the first waveform sequence ends at a low level. In the case of a second time duration equal to 0, the third waveform sequence starts at low and ends at high with only one transition from low to high occurring within the time duration. Under the condition that the second duration is equal to 0, the difference between the third waveform sequence and the first waveform sequence is larger, the waveform sequence is easier to identify, the first waveform sequence can continue to be at the low level until the transmission duration is finished after the first waveform sequence is changed from the high level to the low level, or can continue to be at the low level for a period of time after the first waveform sequence is changed from the high level to the low level, then is changed from the low level to the high level, and continues to be at the high level until the transmission duration is finished. The first waveform sequence has only one jump within the transmission duration, the first waveform sequence is easier to send and receive, the first waveform sequence is changed from high level to low level in the transmission duration and then from low level to high level, the proportion of the low level to the transmission duration is lower, and the power supply/power taking efficiency is higher under the condition that data transmission and power supply are carried out simultaneously.

In an optional implementation manner of this embodiment, the N waveform sequences corresponding to the preset data frame header at least include M waveform sequences, where M waveform sequences are the first M waveform sequences of the N waveform sequences corresponding to the preset data frame header, where M is a positive integer and M is greater than or equal to 2; the M waveform sequences consist of a first waveform sequence; or, the M waveform sequences consist of a third waveform sequence; alternatively, the M waveform sequences include at least one first waveform sequence and at least one third waveform sequence. Taking N to 5 and M to 2, the first 2 waveform sequences of the 5 waveform sequences corresponding to the preset data frame header are exemplified by 2 first waveform sequence groups, and as shown in fig. 1G, a time interval between a time when a high level jumps to a low level for the first time of a 1 st waveform sequence and a time when a high level jumps to a low level for the first time of a 2 nd waveform sequence in the first 2 waveform sequences is transmission duration of the first waveform sequence; alternatively, taking N as 5, M as 2, and the first 2 waveform sequences of the 5 waveform sequences corresponding to the preset data frame header include a first waveform sequence and a third waveform sequence as an example, as shown in fig. 1H, the 1 st waveform sequence is the first waveform sequence, the 2 nd waveform sequence is the third waveform sequence, and when T1 as T1/3 and T2 as T1/6, the time interval between two transitions is T2/3 + T1/6 as T5/6, and the transmission duration T can be calculated according to the time interval. It can be seen that, when the M waveform sequences are composed of the first or third waveform sequences, or include the first and third waveform sequences, since the first and third waveform sequences both include level jump, the calculation of the transmission duration is simpler and faster, and the baud rate of the waveform sequence can be obtained according to the transmission duration T, i.e., the transmission parameter of the current data transmission can be obtained.

Further, when the M waveform sequences are composed of the first waveform sequence, the N waveform sequences corresponding to the preset data frame header further include: at least 1 interference rejection waveform sequence after the M waveform sequences, wherein the at least 1 interference rejection waveform sequence is a second waveform sequence or a third waveform sequence; when the M waveform sequences are composed of the third waveform sequence, the N waveform sequences corresponding to the preset data frame header further include: at least 1 interference rejection waveform sequence after the M waveform sequences, wherein the at least 1 interference rejection waveform sequence is the second waveform sequence or the first waveform sequence. When the M waveform sequences are the first waveform sequence or the third waveform sequence, in order to prevent the data receiving device from judging that the data content is misjudged by considering a plurality of continuous waveform sequences with the same level change time interval as single-frequency interference, the data sending device needs to add an anti-interference waveform sequence after the plurality of waveform sequences with the same waveform change, so that the time interval of the level change is not repeated singly, the data receiving device can identify the level change as normal data transmission instead of single-frequency interference, and the accuracy of the data transmission is improved. For example, after two consecutive first waveform sequences, the device that transmits data adds a second waveform sequence or a third waveform sequence, and the device that receives data can determine that the two consecutive first waveform sequences are normal data and are not single-frequency interference.

In an alternative embodiment of this embodiment, N is 8, and as shown in fig. 1I (taking the second preset time T2 of the third waveform sequence as an example), the N waveform sequences are sequentially a third waveform sequence, a second waveform sequence, and a third waveform sequence.

In the following, a method for calculating the transmission duration is briefly described, taking N as 8 as an example in the present alternative embodiment:

the method comprises the following steps: acquiring waveform sequence characteristics of 8 preset waveform sequences formed by 6 level jumps, wherein the 8 waveform sequences sequentially comprise: a third waveform sequence, a second waveform sequence, and a third waveform sequence; in the present embodiment, the first waveform sequence, the second waveform sequence, and the third waveform sequence have the following waveform sequence characteristics: the transmission duration time T of the first waveform sequence, the second waveform sequence and the third waveform sequence is the same, the first waveform sequence starts with a high level and jumps to a low level after lasting for a first preset time T1, and ends with the high level, the first preset time T1 ≠ 0, the second waveform sequence continues with the high level within the transmission duration time, the third waveform sequence starts with the high level and jumps to a low level after lasting for a second preset time T2, and ends with the high level, the second preset time T2 ═ 0, wherein the preset X level jumps from the high level to the low level;

step two: continuously detecting 6 level jumps at a receiving port, wherein the continuously detected 6 level jumps are all changed from a high level to a low level;

step three: and calculating the transmission duration of one waveform sequence according to the preset waveform sequence characteristics of 8 waveform sequences formed by 6 level jumps and the time interval between any two of the 6 detected level jumps. And if the time interval between the first level jump and the second level jump in the 6 detected level jumps is 50ns, the transmission duration is 50ns, and the time interval between the fourth level jump and the fifth level jump is 100ns, the transmission duration is 50 ns.

The transmission duration is calculated by using the 8 preset waveform sequences and the characteristics of the waveform sequences in the optional embodiment, and the calculation mode, the data sending mode and the data receiving mode are both simple.

In an optional implementation manner of this embodiment, N waveform sequences formed by preset X level jumps are N waveform sequences corresponding to a header of a data frame; after the receiving port continuously detects X level transitions, the method further comprises: continuously detecting level jump at the receiving port; after calculating the transmission duration of a waveform sequence according to the waveform sequence characteristics of the N waveform sequences formed by the preset X level jumps and the time interval between any two of the continuously detected X level jumps, the method further comprises: determining a waveform sequence corresponding to the data transmission frame header according to the level jump continuously detected at the receiving port and the waveform sequence characteristics by taking the transmission duration as the duration of each waveform sequence; and determining a bit sequence of the transmission data according to a waveform sequence corresponding to the transmission data, wherein one of bit 1 and bit 0 is represented by a first waveform sequence, and the other of bit 1 and bit 0 is represented by a second waveform sequence and a third waveform sequence respectively. In this alternative embodiment, the determining the waveform sequence corresponding to the data frame header according to the level jump continuously detected at the receiving port and the waveform sequence characteristic includes, but is not limited to, the following ways: the first method is as follows: the calculated transmission duration is used as the transmission duration of each waveform sequence, the level change in each transmission duration is received by taking the transmission duration as a unit, and the corresponding waveform sequence in the transmission duration is determined according to the level change in each transmission duration and the characteristics of the waveform sequence; the second method comprises the following steps: the receiving port continuously detects the level change, divides the detected level change into at least one waveform sequence by taking the transmission duration as a unit, and determines each waveform sequence according to the characteristics of the waveform sequence. Taking the first mode as an example, the calculated transmission duration is 20ns, a level change within 20ns is received, and a level jump from high level to low level occurs at 6.67ns in the transmission duration, then according to the waveform characteristics that the first waveform sequence starts with high level, the high level jumps to low level after lasting for a first preset time, and T1 is T × 1/3, it is determined that the waveform sequence within the first 20ns is the first waveform sequence, the data bit transmitted by the waveform sequence is 1, the level change within the next 20ns is continuously received, and the data bit of the transmission duration is obtained. Taking the second mode as an example, the calculated transmission duration is 20ns, the level jump is continuously detected at the receiving port, and the received level jump is divided by 20ns, so as to obtain the level change in each transmission duration, for example, the level jump continuously detected at the receiving port is divided into 5 transmission durations, where in the third transmission duration, a level jump from a high level to a low level occurs at 6.67ns, and then the level jump starts at the high level and after the high level continues for a first preset time, and T1 ═ T × 1/3 is a waveform characteristic, so that the waveform sequence in the first 20ns is determined to be the first waveform sequence, and the data bit transmitted by the waveform sequence is 1. In the embodiment, after the transmission duration is obtained, the waveform sequence and the bit sequence corresponding to the transmission data are determined according to the transmission duration, so that the authenticity and the reliability of data transmission are guaranteed, and data receiving errors caused by transmission duration errors are avoided.

In an optional implementation manner of this embodiment, before the transmission duration is taken as the duration of each waveform sequence, and the waveform sequence corresponding to the data is transmitted after the data frame header is determined according to the level jump continuously detected at the receiving port and the waveform sequence characteristics, the method further includes: and judging whether the transmission duration is locally supported transmission duration, if so, executing the step of taking the transmission duration as the duration of each waveform sequence, and determining the waveform sequence corresponding to the transmission data after the data frame header according to the level jump continuously detected at the receiving port and the waveform sequence characteristics. Optionally, if not, the level change of the receiving port is not detected, or the transmitted waveform sequence is not determined after the level change of the receiving port is detected. In this optional embodiment, it is determined whether the transmission duration is the locally supported transmission duration, and then the level change is continuously detected at the receiving port and the waveform sequence is determined, so that the authenticity and accuracy of the data bit represented by the obtained waveform sequence can be ensured, and if the transmission duration is not the locally supported transmission duration, the level change is not continuously detected or the waveform sequence is not determined, thereby avoiding the waste of the device computation capability.

The transmission parameter obtaining method of this embodiment obtains waveform sequence characteristics of N waveform sequences formed by preset X level jumps, continuously detects X level jumps at a receiving port, and calculates a transmission duration of one waveform sequence according to a time interval between any two of the continuously detected X level jumps. By the method for determining the transmission duration, the transmission duration does not need to be negotiated before the data transmission starts, data receiving and transmitting errors caused by different transmission durations of the two devices can be avoided, and the data transmission efficiency and accuracy are improved. In the method, the high level ratio is high, the equipment for receiving the data can be charged within the duration time of the high level, and the charging efficiency is improved.

Example 2

This embodiment provides a terminal, where the terminal corresponds to the transmission parameter obtaining method in embodiment 1 one to one, and details are not repeated herein, and only briefly described, and in an optional implementation manner of this embodiment, specific operations performed by each unit in the terminal may refer to embodiment 1.

In this embodiment, the terminal may be a PC, an iPAD, a mobile phone, an electronic signature tool key, a smart card, a key that engages with a device, or the like.

Fig. 2A is a schematic structural diagram of an alternative terminal 200 of this embodiment, where the terminal includes: a detection module 201, an acquisition module 202, a duration identification module 203, wherein:

an obtaining module 202, configured to obtain waveform sequence characteristics of N waveform sequences formed by X preset level jumps, where N is a positive integer, X is a positive integer and greater than 1, and each waveform sequence of the N waveform sequences formed by the X preset level jumps is one of the following: the first waveform sequence, the second waveform sequence and the third waveform sequence are characterized in that: the transmission duration of the first waveform sequence, the transmission duration of the second waveform sequence and the transmission duration of the third waveform sequence are the same, the first waveform sequence starts from a high level and jumps to a low level after lasting for a first preset time, the second waveform sequence lasts for the high level within the transmission duration, the third waveform sequence starts from the high level and jumps to the low level after lasting for a second preset time, wherein the first preset time and the second preset time are different in duration, and the preset X level jumps from the high level to the low level.

In this embodiment, as shown in fig. 2B, the first waveform sequence may exist in various ways, for example: starting with a high level, jumping to a low level after lasting for a first preset time T1, and finally ending with the low level; or, starting with a high level, jumping to a low level after a first preset time, and finally ending with a high level. That is, the present embodiment only defines the first waveform sequence starting with a high level and jumping to a low level after lasting for the first preset time T1, and there is no specific limitation on what level the first waveform sequence ends. The third waveform sequence can exist in a variety of ways: starting with a high level, jumping to a low level after lasting for a second preset time T2, and finally ending with the low level; or starts with a high level, makes a transition to a low level after lasting for a second preset time T2, and finally ends with a high level. That is, the present embodiment only limits the level at which the third waveform sequence starts at the high level and transitions to the low level after the second predetermined time T2, and is not limited in any way as to what level the third waveform sequence ends. The first preset time T1 is different from the second preset time T2 in duration, so that the data receiving apparatus can determine whether the waveform sequence corresponding to the received level change is the first waveform sequence or the third waveform sequence according to the duration of the high level before the high level of each waveform sequence jumps to the low level.

In this embodiment, for example, when X is 4, N is 5, and 5 waveform sequences are respectively preset as a first waveform sequence, a second waveform sequence, and a third waveform sequence (where, for example, the first waveform sequence starts at a high level, transitions to a low level after a first preset time, and ends at a low level, the third waveform sequence starts at a high level, transitions to a low level after a second preset time, and ends at a low level), the waveform sequence characteristics of the 5 waveform sequences formed by the preset 4 level transitions are obtained as shown in fig. 2C, that is: after the high level lasts for T1 time, the high level jumps to the low level (first jump), after T-T1, the low level returns to the high level, after the high level lasts for T1 time, the low level jumps to the low level (second jump), after T-T1, the low level jumps to the high level (third jump) after the high level lasts for T1 time, after T-T1, the low level returns to the high level, after the high level lasts for T2 time, the low level jumps to the low level (fourth jump), and after the low level lasts for T-T2 time.

The detecting module 201 is configured to continuously detect X level jumps at the receiving port, where the continuously detected X level jumps are all changed from a high level to a low level.

And the duration identifying module 203 is configured to calculate a transmission duration of a waveform sequence according to the waveform sequence characteristics of N waveform sequences formed by the preset X level transitions and a time interval between any two of the continuously detected X level transitions.

In this embodiment, for example, X is 4, N is 5, and 4 level jumps continuously detected by the detection module 201 are as shown in fig. 2D, the transmission duration of one waveform sequence can be calculated according to the waveform sequence characteristics of 5 waveform sequences formed by 4 preset level jumps obtained in the acquisition module 202, and the time interval between any two level jumps, for example, as shown in fig. 2C, the time interval between the first jump and the second jump is T-T1+ T1, i.e., the transmission duration of one waveform sequence, the time interval between the first jump and the third jump is T-T1+ T1+ T1+ T1, i.e., the transmission duration of two waveform sequences, the time interval between the third jump and the fourth jump is T-T1+ T2, and in the case that the proportional relationship between T1, T2 and T is known, i.e. the transmission duration of a sequence of waveforms can be calculated.

In this embodiment, the terminal 200 calculates the transmission duration of a waveform sequence by using the time interval between the same hopping times, and the calculation method is simple, easy to operate and high in accuracy.

In an optional implementation manner of this embodiment, before the duration identifying module 203 calculates the transmission duration of a waveform sequence according to the waveform sequence characteristics of N waveform sequences formed by preset X level hops and the time interval between any two of the detected X level hops, the duration identifying module 203 is further configured to determine whether each of all time intervals of the detected X level hops matches the same preset relationship as the corresponding time interval of all time intervals of the X level hops included in the N waveform sequences formed by the preset X level hops, and if so, trigger an operation of calculating the transmission duration of a waveform sequence according to the waveform sequence characteristics of N waveform sequences formed by the preset X level hops and the time interval between any two of the detected X level hops . When whether each of all time intervals of the continuously detected X level transitions corresponds to the same preset relationship with corresponding time intervals of all time intervals of the X level transitions included in the N waveform sequences formed by the preset X level transitions, the transmission duration module 203 may determine the continuously detected X level transitions as a data frame header, and calculate the transmission duration of one waveform sequence by the transmission duration module 203 after determining the data frame header, which may ensure the accuracy of the calculation of the transmission duration and improve the transmission efficiency.

In an optional implementation of this embodiment, the waveform sequence further includes: the transmission duration and the baud rate of the transmission waveform sequence are in inverse proportion, the first waveform sequence is ended by a high level, and the total duration of a low level appearing in the first waveform sequence in the transmission duration does not change along with the change of the baud rate of the transmission waveform sequence; and/or the third waveform sequence ends with a high level, and the total time length of the low level appearing in the third waveform sequence in the transmission duration time does not change along with the change of the baud rate of the transmission waveform sequence. Under the condition that data transmission and power supply are carried out simultaneously, the shorter the time of the total time length occupied by the low-level duration time is, the longer the power supply or power taking duration time is in the data transmission process, namely under the condition that the baud rate is 50Mbps, the transmission duration time of the first waveform sequence or the third waveform sequence is 20ns, the duration time of the low level is 8ns, the power supply or power taking duration time of the first waveform sequence or the third waveform sequence is 60%, under the condition that the baud rate is 25Mbps, the transmission duration time of the first waveform sequence or the third waveform sequence is 40ns, the duration time of the low level is 8ns, and the power supply or power taking duration time of the first waveform sequence or the third waveform sequence is 80%, namely under the condition that the duration time of the low level is fixed, the lower the baud rate is, the higher the power supply or power taking efficiency is, and the baud rate can be properly reduced for improving the power supply efficiency.

In an optional implementation of this embodiment, the waveform sequence further includes: the total duration of the low level appearing in the first waveform sequence in the transmission duration is less than one half of the duration; and/or the low levels present in the third waveform sequence occupy less than half of the duration of the transmission. Under the condition that data transmission and power supply are carried out simultaneously, the shorter the total duration occupied by the low-level duration time is, the longer the power supply or power taking duration is in the data transmission process, and the higher the power supply/power taking efficiency is.

In an optional implementation of this embodiment, the waveform sequence further includes: t1 ═ a × T, where T1 is a first preset time, T is a transmission duration, a is a preset duty cycle coefficient, and 0< a < 1; t2 ═ b × T, where T2 is a second preset time, b is a preset duty factor, and b is 0 or more and less than 1; and, a ≠ b. For example, when the duration is 20ns, if a is 0.5, T1 is 10ns, and if b is 0.25, T2 is 5 ns. and a and b are different, so that the waveforms of the first waveform sequence and the third waveform sequence are different in characteristics, and the data receiving equipment is ensured not to be confused during data receiving.

In an optional implementation of this embodiment, the waveform sequence further includes: the second preset time is equal to 0, and the third waveform sequence has only one level jump from low level to high level within the transmission duration and is ended by high level; the first waveform sequence starts at a high level and occurs only once a transition from a high level to a low level within the transmission duration in the case where the first waveform sequence ends at a high level, or starts at a high level and occurs only once a transition from a high level to a low level within the transmission duration and ends at a low level in the case where the first waveform sequence ends at a low level. In the case of a second time duration equal to 0, the third waveform sequence starts at low and ends at high with only one transition from low to high occurring within the time duration. Under the condition that the second duration is equal to 0, the difference between the third waveform sequence and the first waveform sequence is larger, the waveform sequence is easier to identify, the first waveform sequence can continue to be at the low level until the transmission duration is finished after the first waveform sequence is changed from the high level to the low level, or can continue to be at the low level for a period of time after the first waveform sequence is changed from the high level to the low level, then is changed from the low level to the high level, and continues to be at the high level until the transmission duration is finished. The first waveform sequence has only one jump within the transmission duration, the first waveform sequence is easier to send and receive, the first waveform sequence is changed from high level to low level in the transmission duration and then from low level to high level, the proportion of the low level to the transmission duration is lower, and the power supply/power taking efficiency is higher under the condition that data transmission and power supply are carried out simultaneously.

In an optional implementation manner of this embodiment, the N waveform sequences formed by the preset X level jumps at least include M waveform sequences, where the M waveform sequences are the first M waveform sequences of the N waveform sequences corresponding to the preset data frame header, where M is a positive integer and is greater than or equal to 2; the M waveform sequences consist of a first waveform sequence; or, the M waveform sequences consist of a third waveform sequence; alternatively, the M waveform sequences include at least one first waveform sequence and at least one third waveform sequence. When the M waveform sequences are composed of the first or third waveform sequences, or include the first and third waveform sequences, since both the first and third waveform sequences include level hopping, the calculation of the transmission duration is simpler and faster, and the baud rate of the waveform sequence can be obtained according to the transmission duration T, i.e., the transmission parameter of the current data transmission can be obtained.

Further, when the M waveform sequences are composed of the first waveform sequence, the N waveform sequences formed by the preset X level jumps further include: at least 1 interference rejection waveform sequence after the M waveform sequences, wherein the at least 1 interference rejection waveform sequence is a second waveform sequence or a third waveform sequence; when the M waveform sequences are composed of the third waveform sequence, the N waveform sequences formed by the preset X level jumps further include: at least 1 interference rejection waveform sequence after the M waveform sequences, wherein the at least 1 interference rejection waveform sequence is the second waveform sequence or the first waveform sequence. When the M waveform sequences are the first waveform sequence or the third waveform sequence, in order to prevent the data receiving device from judging that the data content is misjudged by considering a plurality of continuous waveform sequences with the same level change time interval as single-frequency interference, the data sending device needs to add an anti-interference waveform sequence after the plurality of waveform sequences with the same waveform change, so that the time interval of the level change is not repeated singly, the data receiving device can identify the level change as normal data transmission instead of single-frequency interference, and the accuracy of the data transmission is improved. For example, after two consecutive first waveform sequences, the device that transmits data adds a second waveform sequence or a third waveform sequence, and the device that receives data can determine that the two consecutive first waveform sequences are normal data and are not single-frequency interference.

In an optional implementation manner of this embodiment, N is 8, and the N waveform sequences formed by the preset X level transitions are sequentially a third waveform sequence, a second waveform sequence, and a third waveform sequence.

In an optional implementation manner of this embodiment, N waveform sequences formed by preset X level jumps are N waveform sequences corresponding to a header of a data frame; the detecting module 201 is further configured to continue to detect the level jump at the receiving port after the receiving port continuously detects the X level jumps; the obtaining module 202 is further configured to, after the duration identifying module 203 calculates a transmission duration of one waveform sequence according to waveform sequence characteristics of N waveform sequences formed by preset X level hops and a time interval between any two of the continuously detected X level hops, take the transmission duration as the duration of each waveform sequence, and determine, according to the continuously detected level hops at the receiving port and the waveform sequence characteristics, L waveform sequences corresponding to data transmission after the data frame header; and determining a bit sequence of the transmission data according to a waveform sequence corresponding to the transmission data, wherein one of bit 1 and bit 0 is represented by a first waveform sequence, and the other of bit 1 and bit 0 is represented by a second waveform sequence and a third waveform sequence respectively. In the embodiment, after the transmission duration is obtained, the waveform sequence and the bit sequence corresponding to the transmission data are determined according to the transmission duration, so that the authenticity and the reliability of data transmission are guaranteed, and data receiving errors caused by transmission duration errors are avoided.

In an optional implementation manner of this embodiment, the terminal further includes: the determining module 204 is configured to determine whether the transmission duration is a locally supported transmission duration, and if so, trigger the obtaining module 202 to use the transmission duration as the duration of each waveform sequence, and determine L waveforms corresponding to the transmission data after the data frame header according to the level jump continuously detected at the receiving port and the waveform sequence characteristics. In this optional embodiment, it is determined whether the transmission duration is the locally supported transmission duration, and then the level change is continuously detected at the receiving port and the waveform sequence is determined, so that the authenticity and accuracy of the data bit represented by the obtained waveform sequence can be ensured, and if the transmission duration is not the locally supported transmission duration, the level change is not continuously detected or the waveform sequence is not determined, thereby avoiding the waste of the device computation capability.

In the terminal 200 of this embodiment, the obtaining module 202 obtains the waveform sequence characteristics of N waveform sequences formed by preset X level jumps, the detecting module 201 continuously detects X level jumps at the receiving port, and the duration identifying module 203 calculates the transmission duration of one waveform sequence according to the time interval between any two of the continuously detected X level jumps. By determining the transmission duration, the terminal 200 does not need to negotiate the transmission duration before the data transmission starts, and can also avoid data transceiving errors caused by different transmission durations of the two devices, thereby improving the data transmission efficiency and accuracy. In the embodiment provided by the invention, the high-level ratio is higher, the terminal 200 can be charged within the high-level duration time, and the charging efficiency is improved.

Example 3

The embodiment provides a method for sending a data frame header, which can be applied to communication between a master device and a slave device. The device for sending the header of the data frame may be a master device or a slave device. The device as the master device may be, for example, a terminal, and the device as the slave device may be, for example, an electronic payment device (e.g., an electronic signature tool key, a smart card, a key-engaging device, etc.).

Fig. 3A is a flowchart of a method for sending a header of a data frame according to an embodiment of the present invention, where the method for sending a header of a data frame corresponds to the method for obtaining transmission parameters according to embodiment 1, and how to obtain the transmission parameters by using the header of the data frame and the same contents as those in embodiment 1 refer to embodiment 1, which is not described in detail in this embodiment. As shown in fig. 3A, the sending method of a header of a data frame provided in this embodiment mainly includes the following steps:

step 301, obtaining N waveform sequences corresponding to a preset data frame header, where N is a positive integer, and each of the N waveform sequences is one of the following: the first waveform sequence, the second waveform sequence and the third waveform sequence are characterized in that: the transmission duration of the first waveform sequence, the transmission duration of the second waveform sequence and the transmission duration of the third waveform sequence are the same, the first waveform sequence starts from a high level and jumps to a low level after lasting for a first preset time, the second waveform sequence continues to the high level within the transmission duration, the third waveform sequence starts from the high level and jumps to the low level after lasting for a second preset time, wherein the first preset time and the second preset time are different in duration; and obtaining X level jumps in the N waveform sequences according to the waveform sequence characteristics of each waveform sequence in the N waveform sequences, wherein X is a positive integer and is greater than 1, and the X level jumps from a high level jump to a low level.

In this embodiment, as shown in fig. 3B, the first waveform sequence may exist in various ways, for example: starting with a high level, jumping to a low level after lasting for a first preset time T1, and finally ending with the low level; or, starting with a high level, jumping to a low level after a first preset time, and finally ending with a high level. That is, the present embodiment only defines the first waveform sequence starting with a high level and jumping to a low level after lasting for the first preset time T1, and there is no specific limitation on what level the first waveform sequence ends. The third waveform sequence can exist in a variety of ways: starting with a high level, jumping to a low level after lasting for a second preset time T2, and finally ending with the low level; or starts with a high level, makes a transition to a low level after lasting for a second preset time T2, and finally ends with a high level. That is, the present embodiment only limits the level at which the third waveform sequence starts at the high level and transitions to the low level after the second predetermined time T2, and is not limited in any way as to what level the third waveform sequence ends. The first preset time T1 is different from the second preset time T2 in duration, so that the data receiving apparatus can determine whether the waveform sequence corresponding to the received level change is the first waveform sequence or the third waveform sequence according to the duration of the high level before the high level of each waveform sequence jumps to the low level.

In this step, for example, the preset data frame header corresponds to 5 waveform sequences, and the 5 waveform sequences are respectively a first waveform sequence, a second waveform sequence, and a third waveform sequence (where, taking the first waveform sequence starting with a high level, jumping to a low level after lasting a first preset time, ending with a low level, the third waveform sequence starting with a high level, jumping to a low level after lasting a second preset time, ending with a low level as an example), 4 level jumps in the 5 waveform sequences are obtained according to the waveform sequence characteristics of each waveform sequence in the 5 waveform sequences as shown in fig. 3C, that is: after the high level lasts for T1 time, the high level jumps to the low level (first jump), after T-T1, the low level returns to the high level, after the high level lasts for T1 time, the low level jumps to the low level (second jump), after T-T1, the low level jumps to the high level (third jump) after the high level lasts for T1 time, after T-T1, the low level returns to the high level, after the high level lasts for T2 time, the low level jumps to the low level (fourth jump), and after the low level lasts for T-T2 time.

Step 302, controlling the level of the transmitting port to change according to the X level jumps in the N waveform sequences so as to transmit the data frame header.

In this step, the level of the sending port may be controlled by the main control chip or the sending chip of the data frame header sending device, and the data frame header is sent according to the X level jumps in the N waveform sequences obtained in step 301, so that the data frame header receiving device can obtain the transmission duration of one waveform sequence according to the data frame header.

The total duration of the low level appearing in the first waveform sequence in the transmission duration does not change with the change of the baud rate of the transmission waveform sequence, that is, as shown in fig. 3d (a), when the baud rate of the first waveform sequence is 50Mbps, the transmission duration of the first waveform sequence is 20ns, the duration of the low level is 8ns, when the baud rate is 25Mbps, the transmission duration of the first waveform sequence is 40ns, and the duration of the low level is still 8 ns. The total duration of the low level appearing in the third waveform sequence in the transmission duration does not change with the change of the baud rate of the transmission waveform sequence, namely when the baud rate of the third waveform sequence is 50Mbps, the transmission duration of the third waveform sequence is 20ns, the duration of the low level is 8ns, when the baud rate is 25Mbps, the transmission duration of the third waveform sequence is 40ns, and the duration of the low level is still 8 ns. Under the condition that data transmission and power supply are carried out simultaneously, the shorter the time of the total time length occupied by the low-level duration time is, the longer the power supply or power taking duration time is in the data transmission process, namely under the condition that the baud rate is 50Mbps, the transmission duration time of the first waveform sequence or the third waveform sequence is 20ns, the duration time of the low level is 8ns, the power supply or power taking duration time of the first waveform sequence or the third waveform sequence is 60%, under the condition that the baud rate is 25Mbps, the transmission duration time of the first waveform sequence or the third waveform sequence is 40ns, the duration time of the low level is 8ns, and the power supply or power taking duration time of the first waveform sequence or the third waveform sequence is 80%, namely under the condition that the duration time of the low level is fixed, the lower the baud rate is, the higher the power supply or power taking efficiency is, and the baud rate can be properly reduced for improving the power supply efficiency.

In an optional implementation of this embodiment, the waveform sequence further includes: t1 ═ a × T, where T1 is a first preset time, T is a transmission duration, a is a preset duty cycle coefficient, and 0< a < 1; t2 ═ b × T, where T2 is a second preset time, b is a preset duty factor, and b is 0 or more and 1 or less; and, a ≠ b. and a and b are different, so that the waveforms of the first waveform sequence and the third waveform sequence are different in characteristics, and the data receiving equipment is ensured not to be confused during data receiving.

In an optional implementation of this embodiment, the waveform sequence further includes: as shown in fig. 3E, the second predetermined time is equal to 0, and the third waveform sequence has only one level jump from low level to high level within the transmission duration and ends with high level; the first waveform sequence starts at a high level and occurs only once a transition from a high level to a low level within the transmission duration in the case where the first waveform sequence ends at a high level, or starts at a high level and occurs only once a transition from a high level to a low level within the transmission duration and ends at a low level in the case where the first waveform sequence ends at a low level. In the case of a second time duration equal to 0, the third waveform sequence starts at low and ends at high with only one transition from low to high occurring within the time duration. Under the condition that the second duration is equal to 0, the difference between the third waveform sequence and the first waveform sequence is larger, the waveform sequence is easier to identify, the first waveform sequence can continue to be at the low level until the transmission duration is finished after the first waveform sequence is changed from the high level to the low level, or can continue to be at the low level for a period of time after the first waveform sequence is changed from the high level to the low level, then is changed from the low level to the high level, and continues to be at the high level until the transmission duration is finished. The first waveform sequence has only one jump within the transmission duration, the first waveform sequence is easier to send and receive, the first waveform sequence is changed from high level to low level in the transmission duration and then from low level to high level, the proportion of the low level to the transmission duration is lower, and the power supply/power taking efficiency is higher under the condition that data transmission and power supply are carried out simultaneously.

In an optional implementation manner of this embodiment, the N waveform sequences at least include M waveform sequences, where M is a positive integer and M is greater than or equal to 2; the M waveform sequences consist of a first waveform sequence; or, the M waveform sequences consist of a third waveform sequence; alternatively, the M waveform sequences include at least one first waveform sequence and at least one third waveform sequence. When the M waveform sequences are composed of the first or third waveform sequences, or include the first and third waveform sequences, since both the first and third waveform sequences include level hopping, the calculation of the transmission duration is simpler and faster, and the baud rate of the waveform sequence can be obtained according to the transmission duration T, i.e., the transmission parameter of the current data transmission can be obtained.

Further, when the M waveform sequences are composed of the first waveform sequence, the N waveform sequences further include: at least 1 interference rejection waveform sequence after the M waveform sequences, wherein the at least 1 interference rejection waveform sequence is a second waveform sequence or a third waveform sequence; when the M waveform sequences are composed of the third waveform sequence, the N waveform sequences further include: at least 1 interference rejection waveform sequence after the M waveform sequences, wherein the at least 1 interference rejection waveform sequence is the second waveform sequence or the first waveform sequence. When the M waveform sequences are the first waveform sequence or the third waveform sequence, in order to prevent the data receiving device from judging that the data content is misjudged by considering a plurality of continuous waveform sequences with the same level change time interval as single-frequency interference, the data sending device needs to add an anti-interference waveform sequence after the plurality of waveform sequences with the same waveform change, so that the time interval of the level change is not repeated singly, the data receiving device can identify the level change as normal data transmission instead of single-frequency interference, and the accuracy of the data transmission is improved. For example, after two consecutive first waveform sequences, the device that transmits data adds a second waveform sequence or a third waveform sequence, and the device that receives data can determine that the two consecutive first waveform sequences are normal data and are not single-frequency interference.

In an alternative embodiment of the present embodiment, N is 8, and as shown in fig. 3F (taking the second preset time T2 of the third waveform sequence as an example, the N waveform sequences are sequentially a third waveform sequence, a second waveform sequence, and a third waveform sequence. The 8 preset waveform sequences in the optional embodiment are used as data frame headers to be sent, and the receiving equipment of the data frame headers is simpler in calculation of transmission duration and calculation mode.

The data frame header sending method of this embodiment obtains N waveform sequences corresponding to a preset data frame header, obtains X level jumps in the N waveform sequences according to waveform sequence characteristics of each waveform sequence in the N waveform sequences, and controls a sending port to perform level change according to the X level jumps to send the data frame header. The device for receiving the data frame header can determine the transmission duration through the data frame header without negotiating the transmission duration before the data transmission is started, and can avoid data receiving and transmitting errors caused by different transmission durations of the two devices, thereby improving the data transmission efficiency and accuracy. In the method, the high level ratio is high, and the equipment capable of receiving data can supply power within the duration time of the high level, so that the power supply efficiency is improved.

Example 4

This embodiment provides a sending apparatus, which corresponds to the sending method of the data frame header in embodiment 3 one to one, and is not repeated herein, and only briefly described, in an optional implementation manner of this embodiment, the specific operations performed by each unit in the sending apparatus may refer to embodiment 3.

In this embodiment, the sending device may be a PC, an iPAD, a mobile phone, an electronic signature tool key, a smart card, a key that engages with a device, or the like.

Fig. 4A is a schematic structural diagram of an alternative transmitting apparatus 400 according to this embodiment, where the transmitting apparatus includes: a waveform sequence acquiring module 401 and a sending module 402, wherein:

a waveform sequence obtaining module 401, configured to obtain N waveform sequences corresponding to a preset data frame header, where N is a positive integer, and each of the N waveform sequences is one of the following: the first waveform sequence, the second waveform sequence and the third waveform sequence are characterized in that: the transmission duration of the first waveform sequence, the transmission duration of the second waveform sequence and the transmission duration of the third waveform sequence are the same, the first waveform sequence starts from a high level and jumps to a low level after lasting for a first preset time, the second waveform sequence continues to the high level within the transmission duration, the third waveform sequence starts from the high level and jumps to the low level after lasting for a second preset time, wherein the first preset time and the second preset time are different in duration; obtaining X level jumps in the N waveform sequences according to the waveform sequence characteristics of each waveform sequence in the N waveform sequences, wherein X is a positive integer and is greater than 1, and the X level jumps from a high level jump to a low level;

a sending module 402, configured to control the level of the sending port to change according to X level jumps in the N waveform sequences obtained by the waveform sequence obtaining module 401, so as to send a header of the data frame.

In this embodiment, the sending module 402 changes according to X level jumps in the N waveform sequences obtained by the waveform sequence obtaining module 401, and sends the data frame header, so that the data frame header receiving device obtains the transmission duration of one waveform sequence according to the data frame header.

In an optional implementation of the embodiment of the present invention, the waveform sequence further comprises: the transmission duration and the baud rate of the transmission waveform sequence are in inverse proportion, the first waveform sequence is ended by a high level, and the total duration of a low level appearing in the first waveform sequence in the transmission duration does not change along with the change of the baud rate of the transmission waveform sequence; and/or the third waveform sequence ends with a high level, and the total time length of the low level appearing in the third waveform sequence in the transmission duration time does not change along with the change of the baud rate of the transmission waveform sequence. The transmission duration and the baud rate of the transmission waveform sequence are in an inverse proportion relation, and the longer the transmission duration, the smaller the baud rate, i.e. the slower the transmission speed, and the shorter the transmission duration, the larger the baud rate, i.e. the faster the transmission speed. That is, under the condition that the duration of the low level is fixed, the lower the baud rate is, the higher the power supply or power taking efficiency is, and in order to improve the power supply efficiency, the baud rate can be properly reduced.

In an optional implementation of the embodiment of the present invention, the waveform sequence further comprises: the total duration of the low level appearing in the first waveform sequence in the transmission duration is less than one half of the duration; and/or the low levels present in the third waveform sequence occupy less than half of the duration of the transmission. Under the condition that data transmission and power supply are carried out simultaneously, the shorter the total duration occupied by the low-level duration time is, the longer the power supply or power taking duration is in the data transmission process, and the higher the power supply/power taking efficiency is.

In an optional implementation of the embodiment of the present invention, the waveform sequence further comprises: t1 ═ a × T, where T1 is a first preset time, T is a transmission duration, a is a preset duty cycle coefficient, and 0< a < 1; t2 ═ b × T, where T2 is a second preset time, b is a preset duty factor, and b is 0 or more and less than 1; and, a ≠ b. and a and b are different, so that the waveforms of the first waveform sequence and the third waveform sequence are different in characteristics, and the data receiving equipment is ensured not to be confused during data receiving.

In an optional implementation of the embodiment of the present invention, the waveform sequence further comprises: the second preset time is equal to 0, and the third waveform sequence has only one level jump from low level to high level within the transmission duration and is ended by high level; the first waveform sequence starts at a high level and occurs only once a transition from a high level to a low level within the transmission duration in the case where the first waveform sequence ends at a high level, or starts at a high level and occurs only once a transition from a high level to a low level within the transmission duration and ends at a low level in the case where the first waveform sequence ends at a low level. In the case of a second time duration equal to 0, the third waveform sequence starts at low and ends at high with only one transition from low to high occurring within the time duration. Under the condition that the second duration is equal to 0, the difference between the third waveform sequence and the first waveform sequence is larger, the waveform sequence is easier to identify, the first waveform sequence can continue to be at the low level until the transmission duration is finished after the first waveform sequence is changed from the high level to the low level, or can continue to be at the low level for a period of time after the first waveform sequence is changed from the high level to the low level, then is changed from the low level to the high level, and continues to be at the high level until the transmission duration is finished. The first waveform sequence has only one jump within the transmission duration, the first waveform sequence is easier to send and receive, the first waveform sequence is changed from high level to low level in the transmission duration and then from low level to high level, the proportion of the low level to the transmission duration is lower, and the power supply/power taking efficiency is higher under the condition that data transmission and power supply are carried out simultaneously.

In an optional implementation manner of the embodiment of the present invention, the N waveform sequences at least include M waveform sequences, where M waveform sequences are first M waveform sequences of N waveform sequences corresponding to a preset data frame header, where M is a positive integer and M is greater than or equal to 2; the M waveform sequences consist of a first waveform sequence; or, the M waveform sequences consist of a third waveform sequence; alternatively, the M waveform sequences include at least one first waveform sequence and at least one third waveform sequence. When the M waveform sequences are composed of the first or third waveform sequences, or include the first and third waveform sequences, since both the first and third waveform sequences include level hopping, the calculation of the transmission duration is simpler and faster, and the baud rate of the waveform sequence can be obtained according to the transmission duration T, i.e., the transmission parameter of the current data transmission can be obtained.

In an alternative implementation of the embodiment of the present invention, N is 8, and the N waveform sequences are sequentially a third waveform sequence, a second waveform sequence, and a third waveform sequence. The 8 preset waveform sequences in the optional embodiment are used as data frame headers to be sent, and the receiving equipment of the data frame headers is simpler in calculation of transmission duration and calculation mode.

In the sending apparatus of this embodiment, the waveform sequence obtaining module 401 obtains N waveform sequences corresponding to a preset data frame header, obtains X level jumps in the N waveform sequences according to waveform sequence characteristics of each waveform sequence in the N waveform sequences, and the sending port of the sending module 402 performs level change according to the X level jumps to send the data frame header. The device for receiving the data frame header can determine the transmission duration through the data frame header without negotiating the transmission duration before the data transmission is started, and can avoid data receiving and transmitting errors caused by different transmission durations of the two devices, thereby improving the data transmission efficiency and accuracy. In the method, the high level ratio is high, and the device capable of receiving data by the sending device 400 can supply power within the duration of the high level, so that the power supply efficiency is improved.

Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.

It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.

It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware that is related to instructions of a program, and the program may be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a separate product, may also be stored in a computer readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A method for sending a header of a data frame is characterized by comprising the following steps:

acquiring N waveform sequences corresponding to a preset data frame header, wherein N is a positive integer, and each waveform sequence in the N waveform sequences is one of the following sequences: a first waveform sequence, a second waveform sequence, and a third waveform sequence, wherein the first waveform sequence, the second waveform sequence, and the third waveform sequence have the following waveform sequence characteristics: the transmission durations of the first waveform sequence, the second waveform sequence and the third waveform sequence are the same, the transmission durations are in inverse proportion to the baud rate of the transmission waveform sequence, and the first waveform sequence starts with a high level and jumps to a low level after lasting for a first preset time, and ends with a high level, and the total duration of the low level appearing in the first waveform sequence within the transmission duration does not vary with the baud rate of the transmission waveform sequence, the second waveform sequence continues to be at a high level for the transmission duration, the third waveform sequence starts at the high level and jumps to a low level after the second waveform sequence continues for a second preset time, ending with a high level, wherein the total duration of the low level appearing in the third waveform sequence in the transmission duration does not change with the change of the baud rate of the transmission waveform sequence; the first preset time and the second preset time are different in duration; obtaining X level jumps in the N waveform sequences according to the waveform sequence characteristics of each waveform sequence in the N waveform sequences, wherein X is a positive integer and is greater than 1, and the X level jumps from a high level jump to a low level;

and controlling the level of the sending port to change according to X level jumps in the N waveform sequences so as to send the data frame header.

2. The method of claim 1,

the waveform sequence features further include:

the total duration of the low levels appearing in the first waveform sequence within the transmission duration is less than one-half of the transmission duration;

and/or the presence of a gas in the gas,

the total duration of the low levels appearing in the third waveform sequence within the transmission duration is less than one-half of the transmission duration.

3. The method according to any one of claims 1-2,

the waveform sequence features further include:

t1 ═ a × T, where T1 is the first preset time, T is the transmission duration, a is a preset duty cycle coefficient, and 0< a < 1;

t2 ═ b × T, where T2 is the second preset time, b is a preset duty cycle coefficient, and b is 0 or more and 1 or less;

and, a ≠ b.

4. The method of claim 1,

the N waveform sequences at least comprise M waveform sequences, and the M waveform sequences are the first M waveform sequences in the N waveform sequences, wherein M is a positive integer and is more than or equal to 2;

the M waveform sequences consist of the first waveform sequence; or, the M waveform sequences consist of the third waveform sequence; alternatively, the M waveform sequences include at least one first waveform sequence and at least one third waveform sequence.

5. The method of claim 4,

when the M waveform sequences consist of the first waveform sequence, the N waveform sequences further include: at least 1 interference rejection waveform sequence following the M waveform sequences, wherein the at least 1 interference rejection waveform sequence is the second waveform sequence or the third waveform sequence;

when the M waveform sequences consist of the third waveform sequence, the N waveform sequences further include: at least 1 interference rejection waveform sequence following the M waveform sequences, wherein the at least 1 interference rejection waveform sequence is the second waveform sequence or the first waveform sequence.

6. The method of any one of claims 1, 2, 4, or 5,

and N is 8, and the N waveform sequences are sequentially the third waveform sequence, the second waveform sequence, the third waveform sequence, the second waveform sequence and the third waveform sequence.

7. A transmitting apparatus, comprising:

a waveform sequence obtaining module, configured to obtain N waveform sequences corresponding to a preset data frame header, where N is a positive integer, and each of the N waveform sequences is one of the following: a first waveform sequence, a second waveform sequence, and a third waveform sequence, wherein the first waveform sequence, the second waveform sequence, and the third waveform sequence have the following waveform sequence characteristics: the transmission durations of the first waveform sequence, the second waveform sequence and the third waveform sequence are the same, the transmission durations are in inverse proportion to the baud rate of the transmission waveform sequence, and the first waveform sequence starts with a high level and jumps to a low level after lasting for a first preset time, and ends with a high level, and the total duration of the low level appearing in the first waveform sequence within the transmission duration does not vary with the baud rate of the transmission waveform sequence, the second waveform sequence continues to be at a high level for the transmission duration, the third waveform sequence starts at the high level and jumps to a low level after the second waveform sequence continues for a second preset time, ending with a high level, wherein the total duration of the low level appearing in the third waveform sequence in the transmission duration does not change with the change of the baud rate of the transmission waveform sequence; the first preset time and the second preset time are different in duration; obtaining X level jumps in the N waveform sequences according to the waveform sequence characteristics of each waveform sequence in the N waveform sequences, wherein X is a positive integer and is greater than 1, and the X level jumps from a high level jump to a low level;

and the sending module is used for controlling the level of the sending port to change according to the X level jumps in the N waveform sequences so as to send the data frame header.

8. The apparatus of claim 7,

the waveform sequence features further include:

and/or the presence of a gas in the gas,

9. The apparatus according to any one of claims 7-8,

the waveform sequence features further include:

t2 ═ b × T, where T2 is the second preset time, b is a preset duty cycle coefficient, and b is 0 or more and less than 1;

and, a ≠ b.

10. The apparatus of claim 7,

the N waveform sequences at least comprise M waveform sequences, and the M waveform sequences are the first M waveform sequences in the N waveform sequences corresponding to the preset data frame header, wherein M is a positive integer and is more than or equal to 2;

11. The apparatus of claim 10,

12. The apparatus of any one of claims 8, 10 or 11,