CN1866310A - Manchester code decoding method and application apparatus therefor - Google Patents
Manchester code decoding method and application apparatus therefor Download PDFInfo
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- CN1866310A CN1866310A CN 200610050824 CN200610050824A CN1866310A CN 1866310 A CN1866310 A CN 1866310A CN 200610050824 CN200610050824 CN 200610050824 CN 200610050824 A CN200610050824 A CN 200610050824A CN 1866310 A CN1866310 A CN 1866310A
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Abstract
The disclosed decoding method for Manchester code comprises: the first SCM organizes the data into a data frame with the lead code, the synchronization code and check code; before decoding, the second SCM decodes the lead code wirelessly before the synchronization code by means of interrupt method and then decides whether the lead code right; if yes, the second SCM samples the data port, or continues to monitor and receive signal combined a timing technique or else continues to monitor signal. This invention improves sensitivity and validation, reduces cost, and has wide application.
Description
Technical field
The present invention relates to a kind of coding/decoding method of coding, especially relate to a kind of coding/decoding method and application apparatus of Manchester's cde.
Background technology
Existing Manchester's cde is widely used in the various low speed communication devices, as in present widely used automobile tire pressure monitoring system, by being installed in the sensor in each tire, accurately measure the air pressure of tire, physical quantitys such as temperature, and be transferred to these information on the automobile tire pressure monitoring system receiver that is installed in the pilothouse by wireless mode, make the driver grasp the pressure and temperature situation of doughnut at any time, and when appearring in tire pressure and temperature, abnormal conditions report to the police, impel the driver in time to solve tire fault, eliminate accident potential, thus guarantee driving safety.
Automobile tire pressure monitoring system is the data that transmit the tire sensor with wireless mode, reliability and stability for the wireless data communications that improves automobile tire pressure monitoring system, mainly contain two kinds of settling modes at present: 1, improve transmitted power, 2, improve receiving sensitivity.
But, because civilian class wireless product emissive power all is restricted, and, improve the serviceable life that emissive power can shorten battery undoubtedly greatly, so this method is worthless because the sensor assembly in the automobile tire pressure monitoring system all is battery-powered.
Improving receiving sensitivity is a feasible solution, but the weak point of method is to need to increase partial circuit at present, and has therefore increased cost of products.
And aspect the decoding of Manchester's cde, also have two kinds of decoding schemas at present at receiving end, and the one, FPDP real-time sampling software decode, the 2nd, decode with interrupt mode by Mancunian peculiar rising edge and negative edge.But because receiving chip still has clutter output when not having Data Receiving, this has brought very big problem to data decode, if adopt pure data sampling decoding then can influence the treating apparatus such as keyboard, LCD demonstration and sound and light alarm of automobile tire pressure monitoring system; And adopt the interrupt mode decoding, and because single-chip microcomputer can only respond a kind of interruption, also can make troubles to decode procedure, therefore say that currently used two kinds of coding/decoding methods to Manchester's cde all exist defective.
Summary of the invention
Technical matters to be solved by this invention provides a kind of coding/decoding method of novel Manchester's cde, can improve the sensitivity of Data Receiving effectively, improve communication distance, reduce cost of products, and solve the contradiction between the cost and reliability when being applied on the Related product.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: a kind of coding/decoding method of Manchester's cde, first single-chip microcomputer is made into a Frame to data set before signal sends data, this Frame comprises synchronous code and check code, before synchronous code, also be provided with lead code, second singlechip at first carries out the wireless data decoding with interrupt mode to lead code before synchronous code is decoded, and judge whether lead code is correct, after being correct, the judgement lead code passes through second singlechip Direct Sampling FPDP again, and in conjunction with a timer timing mode to synchronous code and data decode after the lead code, otherwise continue the monitoring received signal.
The detailed process that described lead code decoding is judged is: " 1 " of definition Manchester's cde is negative edge, " 0 " is rising edge, the 1. step, have I/O mouth that the second singlechip of interrupt function is connected with the data output pin of radiofrequency receiving chip in data when high level drops to low level, produce a singlechip interruption, receive totalizer for simultaneously data " 1 " and add 1, and timer timing from this moment; The 2. step, come interim in port interruption next time, judge whether the timer timing overflows, if interrupt for timer overflows interruption next time, then forwarded for the 3. step to, if interrupting is not that timer overflows interruption next time, then stop the timer timing, read the timer timing time, data " 1 " count pick up device adds 1 simultaneously, timer zero clearing reclocking is waited for next time and being interrupted; The 3. step, judge to receive whether data " 1 " counter is greater than 10, correct if then whole lead code receives, jumped to for the 4. step, if receive data " 1 " rolling counters forward value less than 10, then lead code is monitored in counter O reset again, returns for the 1. step; The 4. step, beginning synchronous code and data decode.
Described lead code is two bytes of 0xFFh, 0xFEh preferably.
Described the 4. the concrete steps in step are as follows: in the 4.-1 step, second singlechip begins the sampled data port, and preserves the data " 0 " of current sampling or " 1 " to data buffer; In the 4.-2 step, when detecting data, whether judgment data produces saltus step, is then to change for the 4.-3 step over to, is not then to return for the 4.-1 step; The 4.-3 step, opening timing device meter, and wait for that timer overflows interruption next time; The 4.-4 step, judge whether timer overflows interruption, be then to change for the 4.-5 step over to, 4.-3 go on foot otherwise return the; In the 4.-5 step, preserve this secondary data, and continue to receive follow-up data; In the 4.-6 step, the data that the data buffer internal interface is taken in and synchronous code relatively judge whether to equate, if equate, then enters the and 5. go on foot; If unequal with synchronous code, Zhi Qian all data decodes all are considered as invalidly so, begin to monitor again lead code; The 5. step received data and CRC8 check code with the same manner, when Data Receiving number of times totalizer reaches in the communication protocol predetermined data length, stopped to receive data, changed for the 6. step over to; The 6. step, data are carried out the CRC8 verification, if data check is correct, then finish decoding; If verification makes mistakes, then abandon this secondary data, returned for the 1. step.
A kind of application apparatus that uses above-mentioned coding/decoding method, comprise emitter and a receiving trap, described emitter comprises that has a pressure, temperature, the intelligence sensor of acceleration and voltage detecting and back signal processing function, first single-chip microcomputer of a 4-8 position, a radio-frequency transmissions core and an emitting antenna, described receiving trap comprises a receiving antenna, a radiofrequency receiving chip and a second singlechip, described intelligence sensor contacts with doughnut, the data-out port of described radiofrequency receiving chip is connected with the I/O interface of described second singlechip, described intelligence sensor contacts with doughnut, the data-out port of described radiofrequency receiving chip is connected with the I/O interface of described second singlechip, described second singlechip carries out the wireless data decoding with the lead code of interrupt mode in to received signal, and described second singlechip is to synchronous code and data decode after the lead code of Direct Sampling FPDP.
Compared with prior art, the invention has the advantages that by before signal sends data, data set being made into a Frame that comprises synchronous code and check code, and lead code is set before synchronous code, before being decoded, synchronous code at first lead code is carried out the wireless data decoding with interrupt mode, and judge whether lead code is correct, this method only needs the input of an external interrupt mouth of single-chip microcomputer as manchester encoded signals, an and internal timing/counter that only needs single-chip microcomputer, as the clock of manchester encoded signals, just can realize efficient real-time decoding is carried out in Manchester's cde; The lead code that is provided with can pick out correct active data in the clutter of data-out port output, can improve the sensitivity of Data Receiving effectively, and improves communication distance, reduces cost of products; Contradiction between workout cost and the reliability well when being applied to Related product (as automobile tire pressure monitoring system) and going up.The present invention can be used for multiple field, be suitable in the strict field of resource requirement harshness, system cost to the decoding of wired or wireless data signal.
Description of drawings
Fig. 1 is the main flow chart of the inventive method;
Fig. 2 is the sub-process figure of the lead code decoding of the inventive method;
Fig. 3 is the decoded sub-process figure of the lead code of the inventive method;
Fig. 4 is the frame format of the Manchester's cde of automobile tire pressure monitoring system of the present invention;
Fig. 5 is the structural representation of application apparatus automobile tire pressure monitoring system of the present invention.
Embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
As shown in Figure 1, with the automobile tire pressure monitoring system is example, it comprises emitter 1 and receiving trap 2, emitter comprises the intelligence sensor 11 that a model is NPXII, it has pressure, temperature, acceleration and voltage detecting and back signal processing function, a model is first single-chip microcomputer 12 with 8 single-chip microcomputer kernels of PCH7970, a TDK5111F radio-frequency transmissions chip 13 and the emitting antenna 14 that model is, receiving trap 2 comprises a receiving antenna 21, a TDA5211 radiofrequency receiving chip 22 and the HT49R50A-1 second singlechip 23 that model is that model is, second singlechip 23 also is connected with keyboard 24 and TN type LCDs 25, intelligence sensor 11 contacts with doughnut, and the data-out port of radiofrequency receiving chip 22 is connected with the I/O interface of second singlechip 23.In order to realize Manchester's cde coding/decoding method of the present invention, utilize first single-chip microcomputer before signal sends data, data set to be made into a Frame, this Frame mainly comprises following content:
| Lead code | | Data | 1 | …… | Data n | The CRC8 check code |
In order to cooperate software decode, the design lead code is the data of two bytes: 0xFFh, 0xFEh.
Suppose that at first the data " 0 " of Manchester's cde, the time that " 1 " continues are T1, the error time of data waveform is ± t1 that each authentic data " 0 " or " 1 " waveform duration are t2:(T1-t1 so)＜=t2＜=(T1+t1).
Can draw the lasting maximum duration of each data waveform by t2 is t3, t3=(T1+t1); Shortest time is t4, t4=(T1-t1).
" 1 " of Manchester's cde is defined as negative edge
" 0 " is defined as rising edge accordingly
Two kinds of particular processing modes when concrete decoding, have been adopted.
1, at lead code.It is these two bytes of 0xFFh, 0xFEh that lead code is set, because these data are except last bit is " 0 ", the whole of other are " 1 ", the data waveform of the preceding 15bit of this lead code is the same so, therefore we are as long as judge that the time interval between two " 1 " is just correct within the manchester encoded data effective impulse width range of appointment, otherwise with regard to mistake, therefore, our design is decoded to wireless data with interrupt mode at lead code.
2, at the data after the lead code.Because this partial data is arbitrarily, its pulse waveform also is arbitrarily.Simple is impracticable with top coding/decoding method at lead code.Consider the arbitrariness of this data waveform, we pass through single-chip microcomputer Direct Sampling FPDP, and come decoded data in conjunction with a timer timing mode, but the moment regularly each and that sampling action changes on the data edge.
Specific implementation step to the lead code software decode is as follows: the 1. step, have I/O mouth that the second singlechip 23 of interrupt function is connected with the data output pin of radiofrequency receiving chip 22 in data when high level drops to low level, produce a singlechip interruption, receive totalizer for simultaneously data " 1 " and add 1, and timer timing from this moment; The 2. step, come interim in port interruption next time, judge whether the timer timing overflows, if interrupt overflowing interruption next time for timer, the data " 1 " that are not Manchester's cde are described, then forwarded for the 3. step to, if interrupting is not that timer overflows interruption next time, then stop the timer timing, read the timer timing time, this time is within t2 scope effective time, it is correct then to go up secondary data " 1 " accumulative total, data " 1 " count pick up device adds 1 simultaneously, and timer zero clearing reclocking is waited for next time and being interrupted; The 3. step, judge and receive whether data " 1 " counter is greater than 10, if then whole lead code receives correct, show that simultaneously ensuing may be synchronous code, jumped to for the 4. step, if receive data " 1 " rolling counters forward value less than 10, then explanation when prepulse be not real data lead code, lead code is monitored in counter O reset again, returns for the 1. step; The 4. step, after receiving last lead code " 0 ", second singlechip 23 is closed the external interrupt function of this port, second singlechip 23 begins to receive the data of synchronous code, data and CRC8 verification, and beginning synchronous code and data decode, concrete steps are as follows: the 4.-1 step, and second singlechip 23 beginning sampled data ports, and preserve the data " 0 " of current sampling or " 1 " to data buffer; In the 4.-2 step, when detecting data, whether judgment data produces saltus step, is then to change for the 4.-3 step over to, is not then to return for the 4.-1 step; The 4.-3 step, the timing of opening timing device, this time regularly is the maximum duration t3 of the valid data pulse of Manchester's cde, afterwards, second singlechip 23 is handled other tasks, and waits for that timer overflows interruption next time; The 4.-4 step, judge whether timer overflows interruption, be then to change for the 4.-5 step over to, 4.-3 go on foot otherwise return the; In the 4.-5 step, timer overflows interruption, preserves this secondary data, and continues to receive follow-up data; In the 4.-6 step, it is 16 times that judgment data receives number of times, and the data that the data buffer internal interface is taken in and synchronous code relatively judge whether to equate, if equate, then enters the and 5. goes on foot; If unequal with synchronous code, Zhi Qian all data decodes all are considered as invalidly so, begin to monitor again lead code; If the Data Receiving number of times is not 16, synchronous code does not also receive so, and 4.-1 the step continues to receive synchronous code to return the; The 5. step received data and CRC8 check code with the same manner, when Data Receiving number of times totalizer reaches in the communication protocol predetermined data length, stopped to receive data, changed for the 6. step over to; The 6. step, data are carried out the CRC8 verification, if data check is correct, illustrate that then this Data Receiving is correct, then finish decoding, second singlechip 23 is made other respective handling function; If verification makes mistakes, this data decode mistake is described, then abandon this secondary data, returned for the 1. step.
Claims (5)
1, a kind of coding/decoding method of Manchester's cde, it is characterized in that first single-chip microcomputer is made into a Frame to data set before signal sends data, this Frame comprises synchronous code and check code, before synchronous code, also be provided with lead code, second singlechip at first carries out the wireless data decoding with interrupt mode to lead code before synchronous code is decoded, and judge whether lead code is correct, after being correct, the judgement lead code passes through second singlechip Direct Sampling FPDP again, and in conjunction with a timer timing mode to synchronous code and data decode after the lead code, otherwise continue the monitoring received signal.
2, the coding/decoding method of a kind of Manchester's cde as claimed in claim 1, it is characterized in that the detailed process that described lead code decoding is judged is: " 1 " of definition Manchester's cde is negative edge, " 0 " is rising edge, the 1. step, have I/O mouth that the second singlechip of interrupt function is connected with the data output pin of radiofrequency receiving chip in data when high level drops to low level, produce a singlechip interruption, receive totalizer for simultaneously data " 1 " and add 1, and timer timing from this moment; The 2. step, come interim in port interruption next time, judge whether the timer timing overflows, if interrupt for timer overflows interruption next time, then forwarded for the 3. step to, if interrupting is not that timer overflows interruption next time, then stop the timer timing, read the timer timing time, data " 1 " count pick up device adds 1 simultaneously, timer zero clearing reclocking is waited for next time and being interrupted; The 3. step, judge to receive whether data " 1 " counter is greater than 10, correct if then whole lead code receives, jumped to for the 4. step, if receive data " 1 " rolling counters forward value less than 10, then lead code is monitored in counter O reset again, returns for the 1. step; The 4. step, beginning synchronous code and data decode.
3, the coding/decoding method of a kind of Manchester's cde as claimed in claim 1 or 2 is characterized in that described lead code is two bytes of 0xFFh, 0xFEh.
4, the coding/decoding method of a kind of Manchester's cde as claimed in claim 2,4. the concrete steps in step are as follows to it is characterized in that described the: the 4.-1 step, second singlechip begins the sampled data port, and preserves the data " 0 " of current sampling or " 1 " to data buffer; In the 4.-2 step, when detecting data, whether judgment data produces saltus step, is then to change for the 4.-3 step over to, is not then to return for the 4.-1 step; The 4.-3 step, opening timing device meter, and wait for that timer overflows interruption next time; The 4.-4 step, judge whether timer overflows interruption, be then to change for the 4.-5 step over to, 4.-3 go on foot otherwise return the; In the 4.-5 step, preserve this secondary data, and continue to receive follow-up data; In the 4.-6 step, the data that the data buffer internal interface is taken in and synchronous code relatively judge whether to equate, if equate, then enters the and 5. go on foot; If unequal with synchronous code, Zhi Qian all data decodes all are considered as invalidly so, begin to monitor again lead code; The 5. step received data and CRC8 check code with the same manner, when Data Receiving number of times totalizer reaches in the communication protocol predetermined data length, stopped to receive data, changed for the 6. step over to; The 6. step, data are carried out the CRC8 verification, if data check is correct, then finish decoding; If verification makes mistakes, then abandon this secondary data, returned for the 1. step.
5, a kind of application apparatus that uses the coding/decoding method of claim 1, comprise emitter and a receiving trap, described emitter comprises that has a pressure, temperature, the intelligence sensor of acceleration and voltage detecting and back signal processing function, first single-chip microcomputer of a 4-8 position, a radio-frequency transmissions core and an emitting antenna, described receiving trap comprises a receiving antenna, a radiofrequency receiving chip and a second singlechip, it is characterized in that described intelligence sensor contacts with doughnut, the data-out port of described radiofrequency receiving chip is connected with the I/O interface of described second singlechip, described second singlechip carries out the wireless data decoding with the lead code of interrupt mode in to received signal, and described second singlechip is to synchronous code and data decode after the lead code of Direct Sampling FPDP.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101902225A (en) * | 2010-07-21 | 2010-12-01 | 中国航空工业集团公司洛阳电光设备研究所 | Bipolar Manchester code decoding device and method |
| CN102045275A (en) * | 2009-10-16 | 2011-05-04 | 昆山九华电子设备厂 | Cable-transmitted Manchester coded signal receiver |
| CN102265129B (en) * | 2008-12-08 | 2013-08-14 | 横滨橡胶株式会社 | Method of monitoring tire status and system for monitoring tire status |
| CN103759888A (en) * | 2014-01-03 | 2014-04-30 | 深圳市道通科技有限公司 | Method and device for correcting Z-axis accelerated speed of tire pressure sensor |
| CN103888458A (en) * | 2014-03-20 | 2014-06-25 | 南京邮电大学 | Point-to-point wireless transmission optimization method based on USRP N200 |
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| CN109217875A (en) * | 2018-10-24 | 2019-01-15 | 江苏沁恒股份有限公司 | Manchester's code coding/decoding method |
| CN110148292A (en) * | 2019-06-28 | 2019-08-20 | 湖南纳雷科技有限公司 | A kind of wireless remote control decoding method and coding and decoding device |
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| US5163067A (en) * | 1991-11-21 | 1992-11-10 | Northern Telecom Limited | Method and apparatus for decoding Manchester encoded data |
| US5475705A (en) * | 1993-04-29 | 1995-12-12 | Ericsson Ge Mobile Communications Inc. | Demodulator for Manchester-coded FM signals |
| JP3347667B2 (en) * | 1998-05-20 | 2002-11-20 | 沖電気工業株式会社 | Manchester encoded data decoding device |
| US6977973B1 (en) * | 2001-10-05 | 2005-12-20 | Raytheon Company | System and method for decoding manchester data |
| EP1347609B1 (en) * | 2002-03-22 | 2007-11-21 | STMicroelectronics S.r.l. | Method and apparatus for decoding Manchester-encoded signals |
| CN1255952C (en) * | 2003-08-21 | 2006-05-10 | 哈尔滨工业大学 | Manchester coder and decoder |
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| CN102265129B (en) * | 2008-12-08 | 2013-08-14 | 横滨橡胶株式会社 | Method of monitoring tire status and system for monitoring tire status |
| US8781760B2 (en) | 2008-12-08 | 2014-07-15 | The Yokohama Rubber Co., Ltd. | Tire condition monitoring method and tire condition monitoring system |
| CN102045275A (en) * | 2009-10-16 | 2011-05-04 | 昆山九华电子设备厂 | Cable-transmitted Manchester coded signal receiver |
| CN101902225A (en) * | 2010-07-21 | 2010-12-01 | 中国航空工业集团公司洛阳电光设备研究所 | Bipolar Manchester code decoding device and method |
| CN101902225B (en) * | 2010-07-21 | 2014-02-12 | 中国航空工业集团公司洛阳电光设备研究所 | Bipolar Manchester code decoding device and method |
| CN103759888A (en) * | 2014-01-03 | 2014-04-30 | 深圳市道通科技有限公司 | Method and device for correcting Z-axis accelerated speed of tire pressure sensor |
| CN103759888B (en) * | 2014-01-03 | 2016-08-17 | 深圳市道通科技股份有限公司 | The bearing calibration of tyre pressure sensor Z axis acceleration and device |
| CN103888458A (en) * | 2014-03-20 | 2014-06-25 | 南京邮电大学 | Point-to-point wireless transmission optimization method based on USRP N200 |
| CN106911334A (en) * | 2017-02-28 | 2017-06-30 | 四川赛科安全技术有限公司 | A kind of fire-fighting industrial bus coding method |
| CN106911334B (en) * | 2017-02-28 | 2021-08-10 | 光和电科技(广东)有限公司 | Fire-fighting industrial bus coding method |
| CN108040022A (en) * | 2017-12-25 | 2018-05-15 | 中天启明石油技术有限公司 | A kind of bus coding and decoding device and method for measurement while-drilling instrument |
| CN108040022B (en) * | 2017-12-25 | 2023-12-29 | 中天启明石油技术有限公司 | Bus coding and decoding device and method for measurement while drilling instrument |
| CN108128104A (en) * | 2018-01-11 | 2018-06-08 | 宁波琻捷电子科技有限公司 | Wireless programming system and its method for burn-recording |
| CN109217875A (en) * | 2018-10-24 | 2019-01-15 | 江苏沁恒股份有限公司 | Manchester's code coding/decoding method |
| CN110148292A (en) * | 2019-06-28 | 2019-08-20 | 湖南纳雷科技有限公司 | A kind of wireless remote control decoding method and coding and decoding device |
| CN110838204A (en) * | 2019-11-05 | 2020-02-25 | 艾体威尔电子技术(北京)有限公司 | Decoding method for magnetic stripe card swiping terminal |
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