CN203574663U - Automatic baud rate detection module - Google Patents
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- CN203574663U CN203574663U CN201320759120.0U CN201320759120U CN203574663U CN 203574663 U CN203574663 U CN 203574663U CN 201320759120 U CN201320759120 U CN 201320759120U CN 203574663 U CN203574663 U CN 203574663U
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Abstract
The utility model discloses an automatic baud rate detection module which includes an accurate baud rate detection unit, a start bit time detection unit, a half bit detection unit, a data frame matching detection unit and an OR gate. The OR gate has three input terminals and one output terminal; the accurate baud rate detection unit includes a baud rate counter, the input of the accurate baud rate detection unit is received data, and the output of the accurate baud rate detection unit is selected baud rate; the input of the data frame matching detection unit is the received data and a baud rate synchronous signal, and the output of the data frame matching detection unit is connected with a first input of the OR gate; the input of the start bit time detection unit is the received data, and the output of the start bit time detection unit is connected with a second input of the OR gate; the input of the half bit detection unit is the received data and the baud rate synchronous signal, and the output of the half bit detection unit is connected with a third input of the OR gate; and the output of the OR gate is baud rate detection error indication. The automatic baud rate detection module of the utility model can realize automatic baud rate detection which is more accurate and faster compared with the prior art.
Description
Technical field
The utility model relates to data communication technology field, relates in particular to a kind of auto-baud-detect module that is applied to the extensive serial data communication field in triones navigation system.
Background technology
In a triones navigation system chip, universal asynchronous receiver/transmitter (UART) (UART) provides asynchronous communication interface as system and extraneous main frame/carry out from the equipment main path of exchanges data.During with main-machine communication, the main interface that it is downloaded/upgrade as program; When from devices communicating, it is for exporting information of navigation and location.
The structure of a typical universal asynchronous receiver/transmitter (UART) (UART) is referring to Fig. 1.For transmitting portion, data t1(8bit to be sent) from bus interface circuit 11, import transmit buffer 13 into; When transmit control device 14 enters transmission state, baud rate selector 12 selects the baud rate brr1 arranging as baud rate brr3 output, and baud rate generator 15 produces baud rate synchronizing signal s1 according to baud rate brr3; Transmit control device 14 is with reference to baud rate synchronizing signal s1, the data t2(8bit that transmit buffer 13 is sent into) be converted into serial data t3 and give external host/from equipment.For receiving unit, serial data r1 is from external host/input from equipment; Receive controller 17 when accepting state, if known baud rate, baud rate selector 12 selects baud rate brr1 as baud rate brr3 output, and baud rate generator 15 produces baud rate synchronizing signal s2 according to baud rate brr3; Receive controller 17 with reference to baud rate synchronizing signal s2, serial data r1 changed into parallel data r2(8bit) send into reception buffer 18; If baud rate the unknown, serial data r1 will be that the baud rate that external equipment sends detects appointment data, now auto-baud-detect module 16 is given baud rate selector 12 according to baud rate detection method by the baud rate brr2 detecting, baud rate selector 12 selects baud rate brr2 to export as baud rate brr3; If successfully received above-mentioned appointment data according to the baud rate detecting, just can use the baud rate brr2 detecting to proceed data receiver; The data r3(8bit that last reception buffer is 18 li) from bus interface circuit 11, read away.
Wherein, auto-baud-detect module 16 comprises baud rate counter 21, referring to Fig. 2, the auto-baud-detect process of auto-baud-detect module 16 comprises: the serial data r1 of reception is the Frame (being above-mentioned appointment data) that agreement sends, and its form is after start bit (start) 0, to meet 8bit serial data 0X41(to send from low level to a high position); Baud rate counter 21 is during start bit, and namely T0 counts between the T1 moment, obtains baud rate value B0; Use baud rate value B0 as the baud rate detecting, remaining data to be sampled, if obtain the result identical with appointment data, think that baud rate detects successfully, baud rate value B0 reception for remainder data as the baud rate detecting; If appointment data do not detected, think that baud rate detects unsuccessfully, when next start bit arrives, restart baud rate and detect.
Because data likely produce deviation through conversion and quantification in transmitting procedure, the low and high level length of the every bit of square wave forming is unequal, the baud rate coming out according to start bit low level is like this likely bigger than normal or less than normal, and result is exactly that auto-baud-detect is unsuccessful or detect successfully but the baud rate obtaining can not meet the error requirements of transmission.Therefore visible, the baud rate detection module of above-mentioned prior art is to have some problems.
Therefore, those skilled in the art is devoted to develop a kind of auto-baud-detect module, realizes more accurate and auto-baud-detect fast.
Utility model content
Because the above-mentioned defect of prior art, technical problem to be solved in the utility model is to provide a kind of auto-baud-detect module, by using accurate baud rate detecting unit, realizes more accurate and auto-baud-detect fast.
For achieving the above object, the utility model provides a kind of auto-baud-detect module, for selecting baud rate at asynchronous receiver-transmitter, described asynchronous receiver-transmitter comprises reception controller and baud rate generator, described reception controller is used for receiving one and receives data, described baud rate generator produces baud rate synchronizing signal according to described baud rate, it is characterized in that, comprise accurate baud rate detecting unit, Frame matching detection unit and or door; Described accurate baud rate detecting unit comprises baud rate counter, and the input of described accurate baud rate detecting unit is described reception data, and the output of described accurate baud rate detecting unit is described baud rate; Described Frame matching detection unit is for judging that whether use the sample data of described reception data acquisition of baud rate synchronizing signal identical with appointment data, the input of described Frame matching detection unit is described reception data and described baud rate synchronizing signal, and the output of described Frame matching detection unit is connected with first input end described or door.
Further, described appointment data is 0X41.
Further, the described output of described accurate baud rate detecting unit comprises the special rate value of first wave, the second baud rate value and the 3rd baud rate value.
Further, described the first baud rate value is the counting of described baud rate counter between the zero hour and the first moment; Described the second baud rate value is the half of the counting of described baud rate counter between the described zero hour and the second moment; Described the 3rd baud rate value is 1/8th of the counting of described baud rate counter between the described zero hour and the 3rd moment; The low level trailing edge of the described reception data of the described correspondence zero hour; The rising edge of first high level of described corresponding described reception data of the first moment; The trailing edge of first high level of described corresponding described reception data of the second moment; The trailing edge of second high level of described corresponding described reception data of the 3rd moment.
Further, described auto-baud-detect module also comprises start bit time detecting unit, and the input of described start bit time detecting unit is described reception data, and the output of described start bit time detecting unit is connected with the second input described or door.
Further, described auto-baud-detect module also comprises half bit detection unit, the input of described half bit detection unit is described reception data and described baud rate synchronizing signal, and the output of described half bit detection unit is connected with the 3rd input described or door.
Further, described or door is output as baud rate and detects wrong indication.
In preferred embodiments of the present utility model, provide a kind of auto-baud-detect module, for selecting baud rate at asynchronous receiver-transmitter.This asynchronous receiver-transmitter comprises reception controller and baud rate generator, receives controller and is used for receiving reception data, and baud rate generator produces baud rate synchronizing signal according to this selected baud rate.Auto-baud-detect module of the present utility model comprises accurate baud rate detecting unit, start bit time detecting unit, half bit detection unit, Frame matching detection unit and or door.Wherein, accurately baud rate detecting unit comprises baud rate counter, baud rate counter is according to reference clock, carves from the outset to the first moment, from the first moment in moment to the second and from the second three moment of moment to the, constantly counts, and obtains respectively first, second and the 3rd baud rate value; The baud rate generator of asynchronous receiver-transmitter, using first, second and third baud rate value as baud rate, produces first, second and third baud rate synchronizing signal; Frame matching detection unit compares and judges whether to send baud rate and detect wrong indication receiving data and appointment data that controller uses first, second and third baud rate synchronizing signal to sample to received signal to obtain; By baud rate counter, the counting between the zero hour and the first moment and 0X8000 compare and judge whether to send baud rate and detect wrong indication in start bit time detecting unit; Half bit detection unit compares arbitrarycounter judge whether to send baud rate with the counting of this counter between the zero hour and the first moment and detects wrong indication receiving counting in single high level or the single low level pulsewidth of data; Any one in start bit time detecting unit, half bit detection unit and Frame matching detection unit sent baud rate and detected wrong indication, auto-baud-detect module of the present utility model is sent baud rate and is detected wrong indication, re-starts auto-baud-detect.
As can be seen here, auto-baud-detect module of the present utility model is by being used baud rate counter to count to obtain three baud rate values for three times in one-time detection process, and correspondingly baud rate generator produces three baud rate synchronizing signals, can eliminate due to the impact that quantizes the low and high level deviation of bringing; And, auto-baud-detect module of the present utility model can also judge receive data start bit whether extremely and whether the situation of data pulse widths deficiency occurs, and when there are above-mentioned abnormal conditions, send baud rate and detect wrong indication to re-start auto-baud-detect.Thus, auto-baud-detect module of the present utility model can provide with respect to prior art auto-baud-detect more accurately and fast.
Below with reference to accompanying drawing, the technique effect of design of the present utility model, concrete structure and generation is described further, to understand fully the purpose of this utility model, feature and effect.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the asynchronous receiver-transmitter of prior art.
Fig. 2 has shown the auto-baud-detect of prior art.
Fig. 3 is the structured flowchart of auto-baud-detect module of the present utility model.
Fig. 4 has shown the auto-baud-detect of auto-baud-detect module of the present utility model.
Fig. 5 has shown half bit-detection of auto-baud-detect module of the present utility model.
Fig. 6 has shown the auto-baud-detect of auto-baud-detect module of the present utility model when reception data exist quantization error.
Embodiment
Auto-baud-detect module of the present utility model, for the auto-baud-detect module 16 of the asynchronous receiver-transmitter of the prior art shown in alternate figures 1, selected baud rate in asynchronous receiver-transmitter.Asynchronous receiver-transmitter comprises reception controller 17 and baud rate generator 15, receives controller 17 and receives data for receiving one, and baud rate generator 15 produces baud rate synchronizing signal according to selected baud rate.
As shown in Figure 3, auto-baud-detect module of the present utility model comprise accurate baud rate detecting unit 41, start bit time detecting unit 42, half bit detection unit 43, Frame matching detection unit 44 and one or.Wherein, or door there is three inputs and an output; Accurately baud rate detecting unit 41 comprises baud rate counter 21, and accurately the input of baud rate detecting unit 41 is to receive data (being serial data r1), and accurately the output of baud rate detecting unit 41 is selected baud rates; The input of Frame matching detection unit 44 is to receive data r1 and baud rate synchronizing signal s2, the output of Frame matching detection unit 44 with or the first input end of door be connected; The input of start bit time detecting unit 42 is to receive data r1, the output of start bit time detecting unit 42 with or the second input of door be connected; The input of half bit detection unit 43 is to receive data r1 and baud rate synchronizing signal s2, the output of half bit detection unit 43 with or the 3rd input of door be connected; Or door is output as the wrong indication of baud rate detection.
Fig. 4 has shown the auto-baud-detect of auto-baud-detect module of the present utility model, and its detailed process is as follows:
Setting appointment data is 0X41, and the reception data that receive controller 17 are the serial data r1 shown in Fig. 4, and its form is after start bit (start) 0, to meet 8bit serial data 0X41(to send from low level to a high position).The corresponding first moment T1 of rising edge of first high level of these reception data; The corresponding second moment T2 of trailing edge of its first high level; Corresponding the 3rd moment T3 of trailing edge of its second high level.In addition, the low level trailing edge corresponding zero hour of the T0 of start bit 0.
It is the prior art of asynchronous receiver-transmitter that baud rate generator 15 produces baud rate synchronizing signal s2 according to selected baud rate, is not repeated herein.Particularly, using the first baud rate value B01 as baud rate, according to this selected baud rate, baud rate generator 15 produces the first baud rate synchronizing signal as baud rate synchronizing signal s2.Receive controller 17 and use the first baud rate synchronizing signal reception data that receive after the first moment T1 of sampling.Data and appointment data that Frame matching detection unit 44 obtains sampling compare, if both are not identical, send baud rate detection mistake and are indicated to or door.
Using the second baud rate value B02 as baud rate, according to this selected baud rate, baud rate generator 15 produces the second baud rate synchronizing signal as baud rate synchronizing signal s2.Receive controller 17 and use the second baud rate synchronizing signal reception data that receive after the second moment T2 of sampling.Data and appointment data that Frame matching detection unit 44 obtains sampling compare, if both are not identical, send baud rate detection mistake and are indicated to or door.
Using the 3rd baud rate value B03 as baud rate, according to this selected baud rate, baud rate generator 15 produces the 3rd baud rate synchronizing signal as baud rate synchronizing signal s2.Receive controller 17 and use the reception data that receive after the 3rd baud rate synchronizing signal sampling the 3rd moment T3.Data and appointment data that Frame matching detection unit 44 obtains sampling compare, if both are not identical, send baud rate detection mistake and are indicated to or door.
When the data that receive are long 0, during auto-baud-detect, may be judged as start bit, for fear of baud rate counter 21, under this state, to count always and cause overflowing, start bit time detecting module 42 can be carried out start bit time detecting.In the present embodiment, start bit time detecting module 42 compares baud rate counter 21 at counting and 0X8000 between the zero hour T0 and the first moment T1, if the counting of baud rate counter 21 between the zero hour T0 and the first moment T1 exceedes 0X8000, send baud rate and detect that mistake is indicated to or door.
When being used as a start bit and processing continuous several 0, once there be a 0 or 1 independent pulsewidth in follow-up data, half bit-detection module 43 is used arbitrarycounter, this counter is compared at the counting between the zero hour T0 and the first moment T1 receiving counting in single high level or the single low level pulsewidth of data and this counter, if the former is less than the latter's 11/16, just can judge the half (consider to quantize and sampling to affect condition restriction be here not enough start bit 11/16) that has the not enough start bit of data pulse widths, sending baud rate detection mistake is indicated to or door.As shown in Figure 5, the counter is here to count according to definite at that time baud rate synchronizing signal, the number of the baud rate synchronizing signal in the corresponding time is counted.As seen from the figure, the first baud rate value B01 that the zero hour, T0 obtained to the baud rate counter 21 of the first moment T1 is as baud rate, but come then along (rising edge or trailing edge) in the next jumping that receives data, it is 16 that the counting of discovery baud rate synchronizing signal s2 is less than 11(normal condition), at this, jump along finishing immediately current baud rate and detect, then re-start auto-baud-detect, until correctly determine start bit.The reason of doing is like this because start bit pulsewidth should be minimum pulsewidth as single-bit pulsewidth in normal reception, just can show start bit misjudgment, and then exit this baud rate and detect if find that there is data pulse widths less than the half of start bit.
When there is quantization error in reception data, 0 and 1 judgement while generally showing level hopping edge, as shown in Figure 6, when it shows as low and high level variation, the length of high level pulsewidth will be significantly shorter than low-level pulse width.In this case, the zero hour T0 to the first moment T1, to collect the first baud rate value B01 will be obviously bigger than normal, therefore only with the first baud rate value B01, generation the first moment T1, to the baud rate synchronizing signal s2 of the second moment T2, samples to next Bit data.To the second moment T2, upgrade the average counter value of continuous two bits of data as the second baud rate value B02, the second baud rate value B02 is now because substantially eliminated the impact quantizing, comparatively accurate as baud rate.Finally to the 3rd moment T3, upgrade the average counter value of continuous eight Bit datas as the 3rd baud rate value B03, due in this process, level common property has been given birth to four saltus steps, issuable each saltus step error is offset between two, and the 3rd baud rate value B03 finally obtaining approaches true baud rate the most.
When low level pulsewidth is shorter in length than high level pulsewidth, with above-mentioned discussion similarly, known the first baud rate value B01 obtaining will be obviously less than normal, and by correction below, the 3rd baud rate value B03 finally obtaining approaches true baud rate the most.
More than describe preferred embodiment of the present utility model in detail.Should be appreciated that those of ordinary skill in the art just can make many modifications and variations according to design of the present utility model without creative work.Therefore, all those skilled in the art comply with design of the present utility model on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment, all should be in by the determined protection range of claims.
Claims (7)
1. an auto-baud-detect module, for selecting baud rate at asynchronous receiver-transmitter, described asynchronous receiver-transmitter comprises reception controller and baud rate generator, described reception controller is used for receiving one and receives data, described baud rate generator produces baud rate synchronizing signal according to described baud rate, it is characterized in that, comprise accurate baud rate detecting unit, Frame matching detection unit and or door; Described accurate baud rate detecting unit comprises baud rate counter, and the input of described accurate baud rate detecting unit is described reception data, and the output of described accurate baud rate detecting unit is described baud rate; Described Frame matching detection unit is for judging that whether use the sample data of described reception data acquisition of baud rate synchronizing signal identical with appointment data, the input of described Frame matching detection unit is described reception data and described baud rate synchronizing signal, and the output of described Frame matching detection unit is connected with first input end described or door.
2. auto-baud-detect module as claimed in claim 1, wherein said appointment data is 0X41.
3. auto-baud-detect module as claimed in claim 2, the described output of wherein said accurate baud rate detecting unit comprises the special rate value of first wave, the second baud rate value and the 3rd baud rate value.
4. auto-baud-detect module as claimed in claim 3, wherein said the first baud rate value is the counting of described baud rate counter between the zero hour and the first moment; Described the second baud rate value is the half of the counting of described baud rate counter between the described zero hour and the second moment; Described the 3rd baud rate value is 1/8th of the counting of described baud rate counter between the described zero hour and the 3rd moment; The low level trailing edge of the described reception data of the described correspondence zero hour; The rising edge of first high level of described corresponding described reception data of the first moment; The trailing edge of first high level of described corresponding described reception data of the second moment; The trailing edge of second high level of described corresponding described reception data of the 3rd moment.
5. auto-baud-detect module as claimed in claim 4, wherein also comprise start bit time detecting unit, the input of described start bit time detecting unit is described reception data, and the output of described start bit time detecting unit is connected with the second input described or door.
6. auto-baud-detect module as claimed in claim 5, wherein also comprise half bit detection unit, the input of described half bit detection unit is described reception data and described baud rate synchronizing signal, and the output of described half bit detection unit is connected with the 3rd input described or door.
7. auto-baud-detect module as claimed in claim 6, wherein said or door is output as baud rate and detects wrong indication.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104702470A (en) * | 2015-03-31 | 2015-06-10 | 南京埃斯顿自动控制技术有限公司 | FPGA-based baud rate online detection method |
| CN105553628A (en) * | 2015-12-05 | 2016-05-04 | 中国航空工业集团公司洛阳电光设备研究所 | Method and device for detecting serial communication baud rate |
| CN106788920A (en) * | 2016-12-19 | 2017-05-31 | 珠海格力电器股份有限公司 | A kind of baud rate deviation detecting method, device and indoor apparatus of air conditioner |
| CN109450607A (en) * | 2018-09-10 | 2019-03-08 | 北京中电华大电子设计有限责任公司 | A kind of calibration of baud rate and device of UART Universal Asynchronous Receiver Transmitter |
| CN110266405A (en) * | 2019-05-10 | 2019-09-20 | 珠海格力电器股份有限公司 | Device talk deviation of signal detection system |
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2013
- 2013-11-26 CN CN201320759120.0U patent/CN203574663U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104702470A (en) * | 2015-03-31 | 2015-06-10 | 南京埃斯顿自动控制技术有限公司 | FPGA-based baud rate online detection method |
| CN104702470B (en) * | 2015-03-31 | 2017-11-14 | 南京埃斯顿自动控制技术有限公司 | Baud rate online test method based on FPGA |
| CN105553628A (en) * | 2015-12-05 | 2016-05-04 | 中国航空工业集团公司洛阳电光设备研究所 | Method and device for detecting serial communication baud rate |
| CN105553628B (en) * | 2015-12-05 | 2018-11-16 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of serial communication baud rate detection method and device |
| CN106788920A (en) * | 2016-12-19 | 2017-05-31 | 珠海格力电器股份有限公司 | A kind of baud rate deviation detecting method, device and indoor apparatus of air conditioner |
| CN106788920B (en) * | 2016-12-19 | 2019-08-23 | 珠海格力电器股份有限公司 | A kind of baud rate deviation detecting method, device and air conditioner indoor unit |
| CN109450607A (en) * | 2018-09-10 | 2019-03-08 | 北京中电华大电子设计有限责任公司 | A kind of calibration of baud rate and device of UART Universal Asynchronous Receiver Transmitter |
| CN109450607B (en) * | 2018-09-10 | 2021-02-09 | 北京中电华大电子设计有限责任公司 | Baud rate calibration method and device for universal asynchronous receiver-transmitter |
| CN110266405A (en) * | 2019-05-10 | 2019-09-20 | 珠海格力电器股份有限公司 | Device talk deviation of signal detection system |
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Effective date of registration: 20230731 Address after: 310053 room 1001, innovation building, 3850 Jiangnan Road, high tech (Binjiang), Hangzhou, Zhejiang Patentee after: Hangzhou Zhongke Microelectronics Co.,Ltd. Address before: 314006 Building 2, No. 778, Asia Pacific Road, Jiaxing, Zhejiang Province (Jiaxing Technopole) Patentee before: JIAXING MICROELECTRONICS AND SYSTEM ENGINEERING CENTER, CHINESE ACADEMY OF SCIENCES |
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