CN116257483A - Asynchronous serial port communication baud rate self-adaption method and device and asynchronous serial port equipment - Google Patents
Asynchronous serial port communication baud rate self-adaption method and device and asynchronous serial port equipment Download PDFInfo
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- CN116257483A CN116257483A CN202310251737.XA CN202310251737A CN116257483A CN 116257483 A CN116257483 A CN 116257483A CN 202310251737 A CN202310251737 A CN 202310251737A CN 116257483 A CN116257483 A CN 116257483A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
- G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
- G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus
- G06F13/4291—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus using a clocked protocol
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F2213/0002—Serial port, e.g. RS232C
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate
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Abstract
The invention provides an asynchronous serial port communication baud rate self-adaption method and device and asynchronous serial port equipment, wherein the method comprises the steps of receiving a signal waveform sent by a sending end; when the signal waveform is received, edge detection is carried out on a target bit of the signal waveform to detect the time for transmitting the target bit by an asynchronous serial port, wherein a fixed signal turning feature is arranged between the target bit and a subsequent data bit in the signal waveform; calculating according to the time for transmitting the target bit by the asynchronous serial port to obtain a baud rate result when the transmitting end transmits data; generating a received baud rate matched with the transmitted signal according to the baud rate result; and receiving the signal waveform sent by the sending end according to the received baud rate. The invention realizes the self-adaption of the baud rate of serial port communication between the sending end and the receiving end, and improves the flexibility and the reliability of serial port communication.
Description
Technical Field
The present invention relates to the field of electronic technologies, and in particular, to an asynchronous serial port communication baud rate adaptive method and apparatus, and an asynchronous serial port device.
Background
UART asynchronous serial communication is a communication mode commonly used at present because of low cost and easy implementation. .
In existing UART designs, the communication reliability is very high for the baud rate of each UART, and it is specified that the baud rate deviation of each UART cannot exceed 10% of the communication protocol, otherwise, the communication will fail. In digital designs, the baud rate is typically determined by the clock frequency and the number of clocks occupied by a unit bit, meaning that UART communication fails if the actual chip clock frequency and the expected difference exceeds 10%. Without a corrected (TRIM) clock circuit, the clock bias easily exceeds the expected 10% and therefore the UART function of the chip is not available until this correction stage. However, UARTs only need two data lines for communication, no clock signal is needed, and the transceiving protocol is simple and needs to be widely used in the calibration stage of the chip, so how to provide an adaptive method for the baud rate of asynchronous serial port communication has important significance for improving the flexibility and reliability of asynchronous serial port communication.
Disclosure of Invention
The invention describes an asynchronous serial port communication baud rate self-adaption method and device and asynchronous serial port equipment, so as to realize serial port communication baud rate self-adaption between a sending end and a receiving end and improve flexibility and reliability of serial port communication.
In one aspect of the present invention, there is provided an asynchronous serial port communication baud rate adaptive method, the method comprising:
receiving a signal waveform sent by a sending end;
when the signal waveform is received, edge detection is carried out on a target bit of the signal waveform to detect the time for transmitting the target bit by an asynchronous serial port, wherein a fixed signal turning feature is arranged between the target bit and a subsequent data bit in the signal waveform;
calculating according to the time for transmitting the target bit by the asynchronous serial port to obtain a baud rate result when the transmitting end transmits data;
generating a received baud rate matched with the transmitted signal according to the baud rate result;
and receiving the signal waveform sent by the sending end according to the received baud rate.
Further, the method further comprises:
and encoding a signal to be transmitted at the transmitting end according to a preset encoding mode so as to enable the signal to be transmitted to form a signal waveform containing the target bit.
Further, the coding mode comprises non-return-to-zero coding.
Further, edge detection of the target bit of the signal waveform to detect the time taken for the asynchronous serial port to transmit the target bit includes:
and detecting the time difference between the falling edge position of the starting moment of the target bit of the signal waveform and the rising edge position of the ending moment of the target bit to obtain the time for transmitting the target bit by the asynchronous serial port.
Further, the clock frequency of the receiving end is larger than the baud rate of the asynchronous serial port.
In a second aspect of the present invention, there is provided an asynchronous serial port communication baud rate adaptive device, the device comprising:
the serial port receiving port is used for receiving the signal waveform sent by the sending end;
the edge detection module is used for carrying out edge detection on a target bit of the signal waveform when the signal waveform is received so as to detect the time for transmitting the target bit by an asynchronous serial port, wherein a fixed signal turning feature is arranged between the target bit and a subsequent data bit in the signal waveform;
the baud rate calculation module is used for calculating and obtaining a baud rate result when the sending end sends data according to the time for the asynchronous serial port to transmit the target bit;
the baud rate generation module is used for generating a received baud rate matched with the transmitted signal according to the baud rate result;
and the data receiving module is used for receiving the signal waveform sent by the sending end according to the received baud rate.
Further, the edge detection module is configured to detect a time difference between a falling edge position of the start time of the target bit and a rising edge position of the end time of the target bit of the signal waveform, so as to obtain a time for transmitting the target bit by the asynchronous serial port.
In a third aspect of the present invention, an asynchronous serial port device is provided, comprising an asynchronous serial port communication baud rate adaptive device as described above.
In a fourth aspect of the present invention, a fast charging device is provided, including an asynchronous serial device as described above.
The asynchronous serial port communication baud rate self-adaption method and device and the asynchronous serial port equipment provided by the embodiment of the invention simplify communication among UART equipment, save the configuration flow of the baud rate before communication, avoid communication failure caused by inaccurate clocks, realize serial port communication baud rate self-adaption between a sending end and a receiving end, and effectively improve flexibility and reliability of serial port communication.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
Drawings
In order to more clearly illustrate the embodiments of the present description or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present description, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of an adaptive method for baud rate of asynchronous serial port communication according to an embodiment of the present invention;
FIG. 2 shows a schematic diagram of a signal flip waveform for non-return-to-zero encoding;
fig. 3 is a schematic structural diagram of an adaptive device for baud rate of asynchronous serial port communication according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It will be understood by those skilled in the art that all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs unless defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Fig. 1 is a flow chart of an adaptive method for baud rate of asynchronous serial port communication according to an embodiment of the present invention. As shown in fig. 1, the adaptive method for the baud rate of the asynchronous serial port communication provided by the invention specifically comprises the following steps:
s11, receiving a signal waveform sent by a sending end;
and S12, when the signal waveform is received, performing edge detection on a target bit of the signal waveform to detect the time for transmitting the target bit by an asynchronous serial port, wherein a fixed signal turning feature is arranged between the target bit and a subsequent data bit in the signal waveform. The target bit is preferably a bit near the start position of the signal waveform, such as the start bit.
S13, calculating according to the time for transmitting the target bit by the asynchronous serial port to obtain a baud rate result when the transmitting end transmits data;
s14, generating a received baud rate matched with the transmitted signal according to the baud rate result;
and S15, receiving the signal waveform sent by the sending end according to the received baud rate.
According to the asynchronous serial port communication baud rate self-adaption method provided by the embodiment of the invention, when the signal waveform of the transmitting end is received, the target bit with the fixed signal overturning characteristic between the signal waveform and the subsequent data bit is subjected to edge detection to detect the time for transmitting the target bit by the asynchronous serial port, the received baud rate matched with the transmitting signal is determined according to the time for transmitting the target bit by the asynchronous serial port, and the signal waveform transmitted by the transmitting end is received, so that the configuration flow of the baud rate before communication is omitted, communication failure caused by inaccurate clocks is avoided, serial port communication baud rate self-adaption between the transmitting end and the receiving end is realized, and the flexibility and reliability of serial port communication are effectively improved.
In the embodiment of the invention, the signal to be transmitted is encoded at the transmitting end according to a preset encoding mode, so that the signal to be transmitted forms a signal waveform containing the target bit. The preset encoding mode includes, but is not limited to, non-return-to-zero encoding, as long as the encoded data has a specific flip characteristic in the transmission process of each bit.
In a specific example, one coding mode of non-return-to-zero coding is selected to code a signal to be transmitted, and the characteristic that the selected coding is turned at least once in the transmission process of each bit is utilized, so that communication failure caused by inaccurate clocks is completely avoided. Wherein fig. 2 shows a signal flip waveform schematic diagram of non-return-to-zero coding. As shown in fig. 2, at the beginning of each bit transmission, the signal toggles, again in the middle of the bit if signal 1 is transmitted, and not in the middle of the bit if signal 0 is transmitted.
Specifically, when the UART is idle, it always outputs a high level, and when data is to be transmitted, it outputs a low level of 1 bit, which is a start bit, then 5-8 bits of data, immediately follows an optional check bit of 1 bit, and finally a stop bit of 1-2 bits high level, and then continuously outputs a high level, which indicates that the frame is sent completely. On the basis of the UART frame structure, the selected code is introduced, the initial bit is not needed to be coded, or a low level is output, the data is needed to be coded by adopting the selected code mode, namely, a rising edge signal is turned over between the initial bit and the first bit to be transmitted, therefore, a receiving circuit can measure and detect the time difference between the falling edge position of the initial bit (namely, the target bit) of the signal waveform to the rising edge position of the ending moment of the initial bit, namely, the time interval used by UART transmission is obtained, the baud rate result when the transmitting end transmits data is calculated by utilizing the time interval, the receiving baud rate matched with the transmitting signal is generated according to the baud rate result, the data and check bits transmitted next are sampled according to the receiving baud rate, and the receiving of the data and the check bits is completed.
In this embodiment, the clock frequency of the receiving end is greater than the baud rate of the asynchronous serial port. Alternatively, the clock frequency of the receiving end may be more than 10 times the baud rate of the asynchronous serial port. In practical applications, as long as the clock frequency of the receiving circuit is greater than or far greater than the baud rate of the UART, the UART reception will not fail, and even if the clock frequency is shifted, the UART signal reception will not be affected at all. The baud rate of UART is generally from tens of K to hundreds of K, so the clock frequency of the receiving end is only greater than from tens of K to hundreds of K, so the requirement of the clock frequency is easy to realize.
In a specific embodiment, when the master device or the upper computer transmits UART data to the slave device, the slave device does not need to configure the baud rate of the slave device in advance, and the slave device calculates the baud rate of communication from the target bit of transmission according to the non-return-to-zero code, receives subsequent data and check bits according to the baud rate, and replies the master device or the upper computer with the baud rate in turn. The invention simplifies the communication between UARTs, omits the configuration of the baud rate before communication, has no requirement on the accuracy of clock frequency, and greatly improves the reliability of communication.
In addition, the embodiment of the invention also provides an asynchronous serial port communication baud rate self-adapting device, which comprises a functional module for realizing the asynchronous serial port communication baud rate self-adapting method. Fig. 3 is a schematic structural diagram of an adaptive device for baud rate of asynchronous serial port communication according to an embodiment of the present invention. As shown in fig. 3, the apparatus includes a serial port receiving port 201, an edge detection module 202, a baud rate calculation module 203, a baud rate generation module 204, and a data receiving module 205, where:
a serial port receiving port 201, configured to receive a signal waveform sent by a sending end;
an edge detection module 202, configured to, when receiving the signal waveform, perform edge detection on a target bit of the signal waveform to detect a time taken for an asynchronous serial port to transmit the target bit, where the target bit is a start bit of the signal waveform, and a fixed signal flip feature is provided between the target bit and a subsequent data bit in the signal waveform;
the baud rate calculation module 203 is configured to calculate, according to the time taken by the asynchronous serial port to transmit the target bit, a baud rate result when the transmitting end performs data transmission;
a baud rate generating module 204, configured to generate a received baud rate matched with the transmission signal according to the baud rate result;
and the data receiving module 205 is configured to receive a signal waveform sent by the sending end according to the received baud rate.
Further, the edge detection module 202 is configured to detect a time difference between a falling edge position of the target bit start time and a rising edge position of the target bit end time of the signal waveform, so as to obtain a time for the asynchronous serial port to transmit the target bit.
For the embodiment of the adaptive device for the baud rate of the asynchronous serial port communication, the implementation process is consistent with the adaptive method for the baud rate of the asynchronous serial port communication provided by the embodiment of the invention, and the achieved effect is the same as that of the adaptive method for the baud rate of the asynchronous serial port communication provided by the embodiment of the application, and the relevant parts are referred to the part of the description of the system embodiment and are not repeated here.
In addition, the embodiment of the invention also provides asynchronous serial port equipment, which comprises the adaptive device for the baud rate of the asynchronous serial port communication.
For the asynchronous serial device embodiment, the implementation process is consistent with the asynchronous serial communication baud rate adaptive method provided by the embodiment of the present invention, and the achieved effect is the same as that of the asynchronous serial communication baud rate adaptive method provided by the embodiment of the present application, and the relevant parts are referred to the part of the description of the system embodiment and are not repeated here.
In addition, the embodiment of the invention also provides a quick charging device which comprises the asynchronous serial port equipment.
For the fast charging device embodiment, the implementation process is consistent with the adaptive method of the baud rate of the asynchronous serial port communication provided by the embodiment of the present invention, and the achieved effect is the same as that of the adaptive method of the baud rate of the asynchronous serial port communication provided by the embodiment of the present application, and the relevant parts are referred to the part of the description of the system embodiment and are not repeated here.
The asynchronous serial port communication baud rate self-adaption method and device and the asynchronous serial port equipment provided by the embodiment of the invention simplify communication among UART equipment, save the configuration flow of the baud rate before communication, avoid communication failure caused by inaccurate clocks, realize serial port communication baud rate self-adaption between a sending end and a receiving end, and effectively improve flexibility and reliability of serial port communication.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for the device embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and reference is made to the description of the method embodiments in part.
Those skilled in the art will appreciate that in one or more of the examples described above, the functions described in the present invention may be implemented in hardware, software, a pendant, or any combination thereof. When implemented in software, these functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium.
The foregoing embodiments have been provided for the purpose of illustrating the general principles of the present invention in further detail, and are not to be construed as limiting the scope of the invention, but are merely intended to cover any modifications, equivalents, improvements, etc. based on the teachings of the invention.
Claims (9)
1. An asynchronous serial port communication baud rate self-adaption method, which is characterized by comprising the following steps:
receiving a signal waveform sent by a sending end;
when the signal waveform is received, edge detection is carried out on a target bit of the signal waveform to detect the time for transmitting the target bit by an asynchronous serial port, wherein a fixed signal turning feature is arranged between the target bit and a subsequent data bit in the signal waveform;
calculating according to the time for transmitting the target bit by the asynchronous serial port to obtain a baud rate result when the transmitting end transmits data;
generating a received baud rate matched with the transmitted signal according to the baud rate result;
and receiving the signal waveform sent by the sending end according to the received baud rate.
2. The asynchronous serial port communication baud rate adaptation method according to claim 1, further comprising:
and encoding a signal to be transmitted at the transmitting end according to a preset encoding mode so as to enable the signal to be transmitted to form a signal waveform containing the target bit.
3. The method according to claim 2, wherein the coding mode includes non-return-to-zero coding.
4. A method of adapting the baud rate of an asynchronous serial port communication according to any of claims 1-3, wherein edge detecting a target bit of said signal waveform to detect the time taken for an asynchronous serial port to transmit said target bit comprises:
and detecting the time difference between the falling edge position of the starting moment of the target bit of the signal waveform and the rising edge position of the ending moment of the target bit to obtain the time for transmitting the target bit by the asynchronous serial port.
5. The adaptive method of baud rate for asynchronous serial port communication according to claim 1, wherein the clock frequency of the receiving end is greater than the baud rate of the asynchronous serial port.
6. An asynchronous serial port communication baud rate adaptive device, comprising:
the serial port receiving port is used for receiving the signal waveform sent by the sending end;
the edge detection module is used for carrying out edge detection on a target bit of the signal waveform when the signal waveform is received so as to detect the time for transmitting the target bit by an asynchronous serial port, wherein a fixed signal turning feature is arranged between the target bit and a subsequent data bit in the signal waveform;
the baud rate calculation module is used for calculating and obtaining a baud rate result when the sending end sends data according to the time for the asynchronous serial port to transmit the target bit;
the baud rate generation module is used for generating a received baud rate matched with the transmitted signal according to the baud rate result;
and the data receiving module is used for receiving the signal waveform sent by the sending end according to the received baud rate.
7. The adaptive device of the baud rate of the asynchronous serial port communication according to claim 6, wherein said edge detecting module is configured to detect a time difference between a falling edge position of a start time of said target bit of said signal waveform and a rising edge position of an end time of said target bit, so as to obtain a time for the asynchronous serial port to transmit said target bit.
8. An asynchronous serial device comprising an asynchronous serial communication baud rate adaptation means according to any of claims 6-7.
9. A quick charge apparatus comprising an asynchronous serial device according to claim 8.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117155782A (en) * | 2023-09-15 | 2023-12-01 | 江苏舒茨测控设备股份有限公司 | Method for automatically analyzing communication parameters |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117155782A (en) * | 2023-09-15 | 2023-12-01 | 江苏舒茨测控设备股份有限公司 | Method for automatically analyzing communication parameters |
| CN117155782B (en) * | 2023-09-15 | 2024-06-07 | 江苏舒茨测控设备股份有限公司 | Method for automatically analyzing communication parameters |
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