CN114070341B - Tire pressure detection signal receiving circuit, system and method - Google Patents
Tire pressure detection signal receiving circuit, system and method Download PDFInfo
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- CN114070341B CN114070341B CN202111359397.XA CN202111359397A CN114070341B CN 114070341 B CN114070341 B CN 114070341B CN 202111359397 A CN202111359397 A CN 202111359397A CN 114070341 B CN114070341 B CN 114070341B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
- B60C23/02—Signalling devices actuated by tyre pressure
- B60C23/04—Signalling devices actuated by tyre pressure mounted on the wheel or tyre
- B60C23/0408—Signalling devices actuated by tyre pressure mounted on the wheel or tyre transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
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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
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Abstract
The invention provides a tire pressure detection signal receiving circuit, a system and a method.A synchronous module carries out synchronous and filtering processing on a received coded baseband signal, and a configuration module outputs a preset baud rate and a preset synchronous mode; the detection module detects the processed baseband signal based on a preset baud rate and outputs an effective signal and an actual baud rate; the clock generation module receives a preset baud rate or an actual baud rate and outputs a baud rate clock; the frame synchronization module receives the effective signal and the baud rate clock, samples the effective signal, matches the sampled signal with a preset synchronization mode, and outputs a buffer signal; the decoding module receives the buffer signal and the baud rate clock and decodes the buffer signal; the configuration module receives the decoded data and sends the decoded data to the application module. The tire pressure detection signal receiving circuit is realized by adopting a hardware circuit, has smaller dependence on software, can reduce the requirement on frequency, and further can reduce the power consumption and the cost of the tire pressure detection signal receiving circuit.
Description
Technical Field
The invention relates to the technical field of chip circuit design, in particular to a tire pressure detection signal receiving circuit, a system and a method.
Background
With the formal implementation of the mandatory standards for Tire Pressure Monitoring Systems (TPMS), a safe, reliable and low-cost tire pressure monitoring system becomes a key to standard implementation. The normal tire pressure is the assurance of safety, and the too low tire pressure not only can lead to the increase of oil consumption, can cause braking distance extension, understeer even turn on one's side moreover, therefore it is very important to effectively receive the tire pressure detection signal, among the mode of correlation technique, receives the decoding through software control GPIO to the tire pressure detection signal, and this mode mainly relies on software to realize, and the requirement to the frequency is higher, leads to the tire pressure detection signal receiving system's consumption great, and the cost is higher.
Disclosure of Invention
The invention aims to provide a tire pressure detection signal receiving circuit, a system and a method, so as to reduce the system power consumption and the cost.
The invention provides a tire pressure detection signal receiving circuit, which comprises: the device comprises a synchronization module, a detection module, a frame synchronization module, a decoding module and a configuration module which are sequentially connected in series; the configuration module is also respectively connected with the detection module, the clock generation module, the frame synchronization module and the external application module; the clock generation module is also respectively connected with the detection module, the frame synchronization module and the decoding module; the synchronous module is also connected with an external radio frequency demodulation module; the synchronous module is used for receiving the coded baseband signal of the tire pressure detection signal output by the radio frequency demodulation module, synchronizing and filtering the baseband signal and outputting the processed baseband signal; the configuration module is used for outputting a preset baud rate and a preset synchronous mode; the detection module is used for detecting the processed baseband signal based on a preset baud rate and outputting an effective signal and an actual baud rate; the clock generation module is used for receiving a preset baud rate or an actual baud rate and outputting a baud rate clock; the frame synchronization module is used for receiving the effective signal and the baud rate clock, sampling the effective signal based on the baud rate clock to obtain a sampling signal, matching the sampling signal with a preset synchronization mode, and outputting a buffer signal matched with the preset synchronization mode; the decoding module is used for receiving the buffer signal and the baud rate clock, decoding the buffer signal based on the baud rate clock and outputting decoded data; the configuration module is also used for receiving the decoded data and sending the decoded data to the application module.
Further, the circuit further comprises: an interrupt signal generation module; the interrupt signal generation module is respectively connected with the frame synchronization module and the application module; the frame synchronization module is further used for outputting a matching overtime signal if the sampling signal is not successfully matched with the preset synchronization mode in the preset time; the interrupt signal generation module is used for receiving the matched timeout signal, outputting an interrupt signal, a reset signal and a timeout state signal corresponding to the matched timeout signal, and sending the interrupt signal to the application module; wherein, the interrupt signal is used for indicating: interrupting the receiving operation of the tire pressure detection signal; the reset signal is used for indicating: resetting the tire pressure detection signal receiving circuit.
Further, the interrupt signal generation module is also connected with the decoding module; the decoding module is also used for outputting a receiving error identifier when detecting the error of the coding format of the buffer signal; the interrupt signal generation module is also used for receiving the receiving error identifier, outputting an interrupt signal, a reset signal and a receiving error state signal corresponding to the receiving error identifier, and sending the interrupt signal to the application module; the interrupt signal generation module is also used for receiving the decoding completion identification output by the decoding module when the decoding is completed and generating a decoding completion status signal corresponding to the decoding completion identification.
Further, the interrupt signal generation module is also connected with the decryption verification module; the interrupt signal generating module is further configured to receive a decryption verification completion identifier output when the decryption verification is completed by the decryption verification module, and generate a decryption verification completion status signal corresponding to the decryption verification completion identifier.
Further, the encoded baseband signal has been encrypted; the circuit further comprises: a decryption verification module; the decryption verification module is respectively connected with the decoding module and the configuration module; the decryption verification module is used for receiving the decoded data output by the decoding module, carrying out decryption verification on the decoded data and outputting the decrypted and verified decoded data; the configuration module is also used for receiving the decoded data after decryption and verification and sending the decoded data after decryption and verification to the application module.
Further, the encoded baseband signal is encoded in one of the following manners: manchester encoding, differential Manchester encoding, and inverse Manchester encoding.
The invention provides a tire pressure detection signal receiving system, which comprises: a system-in-chip, the tire pressure detection signal receiving circuit of any one of the above; the tire pressure detection signal receiving circuit is integrated in a system-in-chip.
Further, the tire pressure detection signal receiving circuit is connected with a CPU core in the system-in-chip; the tire pressure detection signal receiving circuit is used for sending the output interrupt signal to the CPU core so as to control the tire pressure detection signal receiving system to stop running through the CPU core.
Further, the tire pressure detection signal receiving circuit is connected with a bus node module in the system-in-chip; the tire pressure detection signal receiving circuit is used for sending the output decoded data to the bus node module so as to send the decoded data to an external application module through the bus node module.
The invention provides a tire pressure detection signal receiving method, which comprises the following steps: the synchronous module receives the coded baseband signal of the tire pressure detection signal output by the radio frequency demodulation module, synchronizes and filters the baseband signal and outputs the processed baseband signal; the configuration module outputs a preset baud rate and a preset synchronous mode; the detection module detects the processed baseband signal based on a preset baud rate and outputs an effective signal and an actual baud rate; the clock generation module receives a preset baud rate or an actual baud rate and outputs a baud rate clock; the frame synchronization module receives the effective signal and the baud rate clock, samples the effective signal based on the baud rate clock to obtain a sampling signal, matches the sampling signal with a preset synchronization mode, and outputs a buffer signal matched with the preset synchronization mode; the decoding module receives the buffer signal and the baud rate clock, decodes the buffer signal based on the baud rate clock, and outputs decoded data; the configuration module receives the decoded data and sends the decoded data to the application module.
The invention provides a tire pressure detection signal receiving circuit, a system and a method.A synchronous module carries out synchronous and filtering processing on a received coded baseband signal, and a configuration module outputs a preset baud rate and a preset synchronous mode; the detection module detects the processed baseband signal based on a preset baud rate and outputs an effective signal and an actual baud rate; the clock generation module receives a preset baud rate or an actual baud rate and outputs a baud rate clock; the frame synchronization module receives the effective signal and the baud rate clock, samples the effective signal, matches the sampled signal with a preset synchronization mode, and outputs a buffer signal; the decoding module receives the buffer signal and the baud rate clock and decodes the buffer signal; the configuration module receives the decoded data and sends the decoded data to the application module. The tire pressure detection signal receiving circuit is realized by adopting a hardware circuit, has smaller dependence on software, can reduce the requirement on frequency, and further can reduce the power consumption and the cost of the tire pressure detection signal receiving circuit.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a tire pressure detecting signal receiving circuit according to an embodiment of the present invention;
fig. 2 is a frame format of a baseband signal according to an embodiment of the present invention;
fig. 3 is a frame format example of a baseband signal according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another tire pressure detecting signal receiving circuit according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a system-on-chip structure according to an embodiment of the present invention;
fig. 6 is a schematic diagram of an external application module receiving decoded data according to an embodiment of the present invention;
fig. 7 is a flowchart of a method for receiving a tire pressure detecting signal according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
At present, the traditional tire pressure detection signal receiving method is that the tire pressure detection signal is received and decoded through the software control GPIO, only the signal with lower baud rate can be detected, and the requirement on frequency is higher, so that the system power consumption is large and the cost is high. Based on the above, the embodiment of the invention provides a tire pressure detection signal receiving circuit, a system and a method, and the technology can be applied to an application requiring a chip circuit to be designed for receiving signals.
For the convenience of understanding the present embodiment, a tire pressure detecting signal receiving circuit disclosed in the embodiment of the present invention will be described in detail.
Referring to a schematic structural diagram of a tire pressure detecting signal receiving circuit shown in fig. 1, the tire pressure detecting signal receiving circuit includes a synchronization module 10, a detection module 11, a frame synchronization module 12, a decoding module 13, and a configuration module 14, which are sequentially connected in series; the configuration module 14 is also respectively connected with the detection module 11, the clock generation module 15, the frame synchronization module 12 and an external application module 17; the clock generation module 15 is also respectively connected with the detection module 11, the frame synchronization module 12 and the decoding module 13; the synchronization module 10 is also connected with an external radio frequency demodulation module 16; the synchronization module 10 is configured to receive the encoded baseband signal of the tire pressure detection signal output by the radio frequency demodulation module 16, perform synchronization and filtering processing on the baseband signal, and output a processed baseband signal; the configuration module 14 is configured to output a preset baud rate and a preset synchronization pattern; the detection module 11 is configured to detect the processed baseband signal based on a preset baud rate, and output an effective signal and an actual baud rate; the clock generation module 15 is configured to receive a preset baud rate or an actual baud rate, and output a baud rate clock; the frame synchronization module 12 is configured to receive the effective signal and the baud rate clock, sample the effective signal based on the baud rate clock to obtain a sampling signal, match the sampling signal with a preset synchronization pattern, and output a buffer signal matched with the preset synchronization pattern; the decoding module 13 is configured to receive the buffered signal and the baud rate clock, decode the buffered signal based on the baud rate clock, and output decoded data; the configuration module 14 is further configured to receive the decoded data and send the decoded data to the application module 17.
The above-described tire pressure detecting signal receiving circuit may receive a baseband signal in a frame format as shown in fig. 2, which is composed of four parts of a run, a SYNC (synchronization), a DATA and a CRC (Cyclic Redundancy Check ), wherein the run represents a preamble of a specific baud rate, the frequency is twice the baud rate, here, 6 to 128chips, the SYNC represents the synchronization, 1 to 32chips, and the value of the preset synchronization pattern is 0x86, the output is 10000110chips, the DATA represents the DATA, 1 to 256bits, the same rule of the high-order first, the chip is a chip, the bit is a bit, the concept of a time length is also regarded as a bit, one bit is equal to two chip durations, AES (Advanced Encryption Standard ) and CRC, AES represents encryption, the CRC represents AES, and 8bits are actually implemented, and the DATA is encrypted by using an algorithm of 1+8+1+2+2+2+2+2.
For a better understanding of fig. 2 described above, see an example of a frame format of a baseband signal shown in fig. 3, the running is 12chips, the sync is 11110110chips, and the data is 0101100100100bits, which does not appear AES and CRC because AES and CRC are optional in actual implementation.
In practical implementation, the configuration module is usually a register, and is used for configuring circuit parameters, reading circuit states and data, and the radio frequency demodulation module is usually a low-cost radio frequency demodulation circuit, and the radio frequency demodulation circuit modulates the tire pressure signals collected and sent by the tire pressure sensing chip TPMS (Tire Pressure Monitoring System ) into the baseband signals and outputs the baseband signals to the synchronization module. The synchronous module synchronously receives the baseband signals, simultaneously carries out filtering and deburring, sends the processed signals to the detection module, the detection module detects the signals according to the baud rate configured by the register, outputs effective signals to the frame synchronous module, and simultaneously sends the detected actual baud rate to the clock generation module, wherein the effective signals comprise effective signal marks and buffer data signals of the marks, wherein the effective signal marks are given after the RUNING signals of more than 6 chips are detected. The clock generation module generates a baud rate clock according to the baud rate configured by the register or the actual baud rate detected by the detection module, and the clock is sent to the frame synchronization module and the decoding module as their working clocks. The frame synchronization module receives the effective signal and the baud rate clock, samples the effective signal detected by the detection module based on the baud rate clock generated by the clock generation module to obtain a sampling signal, matches the sampling signal with a synchronization pattern (SYNC_pattern) configured by a register, and when the pattern and the length are completely consistent, the matching is successful, and a mark given after the matching success and a buffer data signal of the mark to the mark are output to the decoding module. The decoding module receives the buffer signal and the baud rate clock, decodes the buffer signal successfully matched by the frame synchronization module based on the baud rate clock generated by the clock generation module, and outputs decoded data to the configuration module. The configuration module receives the decoded data and sends the decoded data to the application module for data exchange.
The tire pressure detection signal receiving circuit provided by the above, the synchronization module performs synchronization and filtering processing on the received encoded baseband signal, and the configuration module outputs a preset baud rate and a preset synchronization mode; the detection module detects the processed baseband signal based on a preset baud rate and outputs an effective signal and an actual baud rate; the clock generation module receives a preset baud rate or an actual baud rate and outputs a baud rate clock; the frame synchronization module receives the effective signal and the baud rate clock, samples the effective signal, matches the sampled signal with a preset synchronization mode, and outputs a buffer signal; the decoding module receives the buffer signal and the baud rate clock and decodes the buffer signal; the configuration module receives the decoded data and sends the decoded data to the application module. The tire pressure detection signal receiving circuit is realized by adopting a hardware circuit, has smaller dependence on software, can reduce the requirement on frequency, and further can reduce the power consumption and the cost of the tire pressure detection signal receiving circuit.
Further, the circuit further comprises: an interrupt signal generation module; the interrupt signal generation module is respectively connected with the frame synchronization module and the application module; the frame synchronization module is further used for outputting a matching overtime signal if the sampling signal is not successfully matched with the preset synchronization mode in the preset time; the interrupt signal generation module is used for receiving the matched timeout signal, outputting an interrupt signal, a reset signal and a timeout state signal corresponding to the matched timeout signal, and sending the interrupt signal to the application module; wherein, the interrupt signal is used for indicating: interrupting the receiving operation of the tire pressure detection signal; the reset signal is used for indicating: resetting the tire pressure detection signal receiving circuit.
In practical implementation, referring to the schematic structural diagram of another tire pressure detecting signal receiving circuit shown in fig. 4, the tire pressure detecting signal receiving circuit includes a synchronization module 10, a detection module 11, a frame synchronization module 12, a decoding module 13, and a configuration module 14, which are sequentially connected in series, and connected with an external radio frequency demodulation module 16; the configuration module 14 is also respectively connected with the detection module 11, the clock generation module 15, the frame synchronization module 12, the interrupt signal generation module 18 and the external application module 17; the clock generation module 15 is also respectively connected with the detection module 11, the frame synchronization module 12 and the decoding module 13; the interrupt signal generating module 18 is respectively connected with the frame synchronizing module 12 and the application module 17, if the sampling signal of the frame synchronizing module 12 and the synchronizing mode configured by the register are not successfully matched within the configured duration, the interrupt signal generating module 18 outputs a matching timeout signal to the interrupt signal generating module 18, and the interrupt signal generating module 18 outputs an interrupt signal, a reset signal and a timeout state signal corresponding to the matching timeout signal after receiving the matching timeout signal, sends the interrupt signal to the application module 17, and stops receiving the tire pressure detection signal; the reset signal resets the tire pressure detection signal receiving circuit to a starting state, and sends a timeout state signal corresponding to the matching timeout signal to the configuration module 14 to wait for the application module 17 to read.
Further, the interrupt signal generation module is also connected with the decoding module; the decoding module is also used for outputting a receiving error identifier when detecting the error of the coding format of the buffer signal; the interrupt signal generation module is also used for receiving the receiving error identifier, outputting an interrupt signal, a reset signal and a receiving error state signal corresponding to the receiving error identifier, and sending the interrupt signal to the application module; the interrupt signal generation module is also used for receiving the decoding completion identification output by the decoding module when the decoding is completed and generating a decoding completion status signal corresponding to the decoding completion identification.
The decoding module may decode the three kinds of codes, i.e., the mannchester code, the differential mannchester code, and the inverse mannchester code, taking fig. 4 as an example, the interrupt signal generating module 18 is further connected to the decoding module 13, and if a buffer signal code format error is found in the buffer signal receiving process output by the frame synchronization module 12, a receiving error flag signal is generated, where the receiving error flag signal is the receiving error flag; the receiving error flag signal is sent to the interrupt signal generating module 18, the interrupt signal generating module 18 receives the receiving error flag signal, outputs an interrupt signal, a reset signal and a receiving error state signal corresponding to the receiving error flag signal, and sends the interrupt signal to the application module 17; stopping the reception of the tire pressure detection signal; the reset signal resets the tire pressure detection signal receiving circuit to a starting state, and sends a reception error state signal corresponding to the reception error flag signal to the configuration module 14, waiting for the application module 17 to read. When the buffer signal output by the frame synchronization module 12 is received, it represents that the decoding is successful, the decoding module 13 generates a decoding completion flag signal, where the decoding completion flag signal is the decoding completion flag, and the decoding completion flag signal is sent to the interrupt signal generating module 18, and the interrupt signal generating module 18 receives the decoding completion flag signal, generates a decoding completion status signal corresponding to the decoding completion flag signal, sends the decoding completion status signal corresponding to the decoding completion flag signal to the configuration module 14, and waits for the application module 17 to read.
Further, the interrupt signal generation module is also connected with the decryption verification module; the interrupt signal generating module is further configured to receive a decryption verification completion identifier output when the decryption verification is completed by the decryption verification module, and generate a decryption verification completion status signal corresponding to the decryption verification completion identifier.
Still taking fig. 4 as an example, the interrupt signal generating module 18 is further connected to a decryption checking module 19, and if the decryption checking module 19 checks that an error occurs, a check error flag signal is output to the interrupt signal generating module 18, the interrupt signal generating module 18 outputs an interrupt signal, a reset signal, and a check error status signal corresponding to the check error flag signal after receiving the interrupt signal, and sends the interrupt signal to the application module 17 to stop receiving the tire pressure detection signal; the reset signal resets the tire pressure detection signal receiving circuit to the initial state, and sends a check error state signal corresponding to the check error flag signal to the configuration module 14, and waits for the application module 17 to read. If the verification is successful, a verification completion flag signal (corresponding to the decryption verification completion identifier) is output to the interrupt signal generation module 18, the interrupt signal generation module 18 receives the verification completion status signal (corresponding to the decryption verification completion status signal) corresponding to the verification completion flag signal, and the verification completion status signal corresponding to the verification completion flag signal is sent to the configuration module 14 to wait for the application module 17 to read.
Further, the encoded baseband signal has been encrypted; the circuit further comprises: a decryption verification module; the decryption verification module is respectively connected with the decoding module and the configuration module; the decryption verification module is used for receiving the decoded data output by the decoding module, carrying out decryption verification on the decoded data and outputting the decrypted and verified decoded data; the configuration module is also used for receiving the decoded data after decryption and verification and sending the decoded data after decryption and verification to the application module.
Still taking fig. 4 as an example, the decryption verification module 19 is connected to the decoding module 13 and the configuration module 14 respectively; the decryption and verification module 19 receives the decoded data output by the decoding module 13, the data is the data before decryption and verification, and since the data encryption is usually AES, the data decryption is completed based on the encryption algorithm, and the verification is performed by using the algorithm CRC-8 (x8+x2+x1+1), which is a common verification method. The data after decryption and verification is output to the configuration module 14, the configuration module 14 receives the data after decryption and verification, and sends the data after decryption and verification to the application module 17 for data exchange, otherwise, other modules have the same functions as the modules described in fig. 1, and the description thereof will not be repeated here.
Further, the encoded baseband signal is encoded in one of the following manners: manchester encoding, differential Manchester encoding, and inverse Manchester encoding.
The Manchester encoding has good characteristics in the aspect of communication data transmission, so the encoding formats adopt Manchester encoding or variant formats thereof, wherein the differential Manchester encoding and the anti-Manchester encoding are variant formats of the Manchester encoding.
On the basis of the above embodiment, the present invention also provides another tire pressure detecting signal receiving system, including: a system-in-chip, the tire pressure detection signal receiving circuit of any one of the above; the tire pressure detection signal receiving circuit is integrated in a system-in-chip.
Taking fig. 4 as an example, the configuration module 44 in the tire pressure detecting signal receiving circuit is an APB (Advanced PeripheralBus ) control interface, and the tire pressure detecting signal receiving circuit adopts an APB standard bus protocol, which is one of AMBA (Advanced Microcontroller Bus Architectur, advanced microcontroller bus structure), and almost becomes a standard on-chip bus structure, so that the module can be very conveniently integrated in a system-on-chip system.
In practical implementation, referring to a schematic diagram of a system-on-chip structure shown in fig. 5, the chip contains 1 CPU Core (Central Processing Unit Core ) 50, and is connected to an AHB GPIO (General-purpose input/output) 52,AHB to APB Bridge (Advanced High-performance Bus to Advanced peripheral Bus bridge) 53 and a memory 54 according to an AHB (Advanced High-performance Bus) Bus protocol 51. The AHB GPIO52 is used for connection with an I/O (input/output) 55, AHB to APB Bridge is used for connection with a bus node module 56, and DBR (Digital Baseband Receiver), CAN (Controller Area Network), 58, LIN (Local Interconnect Network) 59 and other peripherals 60 are mounted on the bus node module 56 for development of an application layer. The DBR57 is the tire pressure detecting signal receiving circuit.
Further, the tire pressure detection signal receiving circuit is connected with a CPU in the system-in-chip; the tire pressure detection signal receiving circuit is used for sending the output interrupt signal to the CPU core so as to control the tire pressure detection signal receiving system to stop running through the CPU core.
Taking fig. 4 as an example, the interrupt signal generating module 18 in the tire pressure detecting signal receiving circuit is connected to the CPU Core 50 in the system-in-chip of fig. 5, and the interrupt signal generating module 18 sends the generated interrupt signal to the CPU Core 50, and the CPU Core controls the tire pressure detecting signal receiving system to stop operating.
Further, the tire pressure detection signal receiving circuit is connected with a bus node module in the system-in-chip; the tire pressure detection signal receiving circuit is used for sending the output decoded data to the bus node module so as to send the decoded data to an external application module through the bus node module.
For easy understanding, referring to a scheme schematic of receiving decoded data by an external application module shown in fig. 6, the tire pressure signal collecting and transmitting end 61 is sequentially connected to the radio frequency demodulation module 16, the system level chip 62, and the external application module 17, where the external application module 17 further includes a CAN/LIN transceiver (Controller Area Network transceiver/Local Interconnect Network transceiver ) chip 63 and an ECU (Electronic Control Unit, electronic control unit) circuit 64.
In practical implementation, the tire pressure signal collecting and transmitting end 61 is usually a tire pressure sensing chip TPMS, the collected tire pressure signal is sent to the radio frequency demodulation module 16, the radio frequency demodulation module 16 modulates the signal into a baseband signal and outputs the baseband signal to the system-level chip 62, the DBR57 in the system-level chip 62 receives the signal and decodes the signal, the decoded data is sent to the internal bus node module 56, the decoded data is output to the CAN/LIN transceiver chip 63 in the external application module 17 through the mounted CAN58 and LIN59, and the data interaction is performed with the subsequent ECU circuit 64 by using the CAN/LIN protocol.
On the basis of the embodiment, the invention also provides another tire pressure detection signal receiving method, which is realized on the basis of the embodiment; as shown in fig. 7, the method includes the steps of:
in step S702, the synchronization module receives the encoded baseband signal of the tire pressure detection signal output by the radio frequency demodulation module, performs synchronization and filtering processing on the baseband signal, and outputs the processed baseband signal.
In practical implementation, the radio frequency demodulation module is usually a low-cost radio frequency demodulation circuit, and the circuit modulates the tire pressure signal collected and sent by the tire pressure sensing chip TPMS (Tire Pressure Monitoring System) into the baseband signal and outputs the baseband signal to the synchronization module, and the synchronization module synchronously receives the baseband signal, performs filtering and deburring processing, and sends the processed signal to the detection module.
In step S704, the configuration module outputs a preset baud rate and a preset synchronization pattern.
In actual implementation, the configuration module is usually a register, which is used for configuring circuit parameters, reading circuit states and data, and in actual implementation, the register outputs configured baud rate to the clock generation module and the detection module, and outputs configured synchronization pattern (sync_pattern) to the frame synchronization module.
In step S706, the detection module detects the processed baseband signal based on the preset baud rate, and outputs an effective signal and an actual baud rate.
The detection module detects signals according to the baud rate configured by the register, outputs effective signals to the frame synchronization module, and simultaneously sends the detected actual baud rate to the clock generation module, wherein the effective signals comprise effective signal marks and buffer data signals of the marks after detecting the RUNING signals of more than 6 chips.
Step S708, the clock generation module receives the preset baud rate or the actual baud rate and outputs a baud rate clock; the clock generation module generates a baud rate clock according to the baud rate configured by the register or the actual baud rate detected by the detection module, and the clock is sent to the frame synchronization module and the decoding module as their working clocks.
In step S710, the frame synchronization module receives the effective signal and the baud rate clock, samples the effective signal based on the baud rate clock to obtain a sampling signal, matches the sampling signal with a preset synchronization pattern, and outputs a buffer signal matched with the preset synchronization pattern.
The frame synchronization module receives the effective signal and the baud rate clock, samples the effective signal detected by the detection module based on the baud rate clock generated by the clock generation module to obtain a sampling signal, matches the sampling signal with a synchronization pattern (SYNC_pattern) configured by a register, and when the pattern and the length are completely consistent, the matching is successful, and a mark given after the matching success and a buffer data signal of the mark are output to the decoding module.
In step S712, the decoding module receives the buffered signal and the baud rate clock, decodes the buffered signal based on the baud rate clock, and outputs decoded data.
The decoding module receives the buffer signal and the baud rate clock, decodes the buffer signal successfully matched by the frame synchronization module based on the baud rate clock generated by the clock generation module, and outputs decoded data to the configuration module.
In step S714, the configuration module receives the decoded data and sends the decoded data to the application module.
The configuration module receives the decoded data and sends the decoded data to the application module for data exchange.
According to the tire pressure detection signal receiving method, the synchronous module is used for synchronizing and filtering the received coded baseband signals, and the configuration module outputs a preset baud rate and a preset synchronous mode; the detection module detects the processed baseband signal based on a preset baud rate and outputs an effective signal and an actual baud rate; the clock generation module receives a preset baud rate or an actual baud rate and outputs a baud rate clock; the frame synchronization module receives the effective signal and the baud rate clock, samples the effective signal, matches the sampled signal with a preset synchronization mode, and outputs a buffer signal; the decoding module receives the buffer signal and the baud rate clock and decodes the buffer signal; the configuration module receives the decoded data and sends the decoded data to the application module. The tire pressure detection signal receiving method is realized by adopting a hardware circuit, has smaller dependence on software, can reduce the requirement on frequency, and further can reduce the power consumption and the cost of the tire pressure detection signal receiving circuit.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (10)
1. A tire pressure detecting signal receiving circuit, characterized by comprising: the device comprises a synchronization module, a detection module, a frame synchronization module, a decoding module and a configuration module which are sequentially connected in series; the configuration module is also respectively connected with the detection module, the clock generation module, the frame synchronization module and an external application module; the clock generation module is also respectively connected with the detection module, the frame synchronization module and the decoding module; the synchronous module is also connected with an external radio frequency demodulation module;
the synchronous module is used for receiving the coded baseband signal of the tire pressure detection signal output by the radio frequency demodulation module, synchronizing and filtering the baseband signal and outputting the processed baseband signal; the configuration module is used for outputting a preset baud rate and a preset synchronous mode; the detection module is used for detecting the processed baseband signal based on the preset baud rate and outputting an effective signal and an actual baud rate; the clock generation module is used for receiving the preset baud rate or the actual baud rate and outputting a baud rate clock; the frame synchronization module is used for receiving the effective signal and the baud rate clock, sampling the effective signal based on the baud rate clock to obtain a sampling signal, matching the sampling signal with the preset synchronization mode, and outputting a buffer signal matched with the preset synchronization mode; the decoding module is used for receiving the buffer signal and the baud rate clock, decoding the buffer signal based on the baud rate clock and outputting decoded data; the configuration module is also used for receiving the decoded data and sending the decoded data to the application module.
2. The circuit of claim 1, wherein the circuit further comprises: an interrupt signal generation module; the interrupt signal generation module is respectively connected with the frame synchronization module and the application module;
the frame synchronization module is further configured to output a match timeout signal if the sampling signal is not successfully matched with the preset synchronization pattern within a preset time;
the interrupt signal generation module is used for receiving the matching timeout signal, outputting an interrupt signal, a reset signal and a timeout state signal corresponding to the matching timeout signal, and sending the interrupt signal to the application module; wherein, the interrupt signal is used for indicating: interrupting the receiving operation of the tire pressure detection signal; the reset signal is used for indicating: resetting the tire pressure detection signal receiving circuit.
3. The circuit of claim 2, wherein the interrupt signal generation module is further coupled to the decoding module;
the decoding module is further used for outputting a receiving error identifier when detecting the buffer signal coding format error;
the interrupt signal generation module is further configured to receive the reception error identifier, output the interrupt signal, the reset signal, and a reception error status signal corresponding to the reception error identifier, and send the interrupt signal to the application module;
the interrupt signal generation module is also used for receiving the decoding completion identification output by the decoding module when the decoding is completed and generating a decoding completion state signal corresponding to the decoding completion identification.
4. The circuit of claim 2, wherein the interrupt signal generation module is further coupled to a decryption verification module;
the interrupt signal generating module is further configured to receive a decryption verification completion identifier output by the decryption verification module when the decryption verification is completed, and generate a decryption verification completion status signal corresponding to the decryption verification completion identifier.
5. The circuit of claim 1, wherein the encoded baseband signal has been encrypted; the circuit further comprises: a decryption verification module; the decryption verification module is respectively connected with the decoding module and the configuration module;
the decryption verification module is used for receiving the decoded data output by the decoding module, carrying out decryption verification on the decoded data and outputting the decoded data after decryption verification;
the configuration module is also used for receiving the decoded data after decryption and verification and sending the decoded data after decryption and verification to the application module.
6. The circuit of claim 1, wherein the encoded baseband signal is encoded in one of the following ways: manchester encoding, differential Manchester encoding, and inverse Manchester encoding.
7. A tire pressure detection signal receiving system, characterized in that the system comprises: a system-in-chip, the tire pressure detection signal receiving circuit of any one of claims 1 to 6;
the tire pressure detection signal receiving circuit is integrated in the system-on-chip.
8. The system according to claim 7, wherein the tire pressure detection signal receiving circuit is connected to a CPU core in the system-in-chip; the tire pressure detection signal receiving circuit further includes: an interrupt signal generation module; the interrupt signal generation module is respectively connected with the frame synchronization module and the application module;
the tire pressure detection signal receiving circuit is used for sending the interrupt signal output by the interrupt signal generation module to the CPU core so as to control the tire pressure detection signal receiving system to stop running through the CPU core.
9. The system of claim 7, wherein the tire pressure detection signal receiving circuit is connected to a bus node module in the system-in-chip;
the tire pressure detection signal receiving circuit is used for sending the output decoded data to the bus node module so as to send the decoded data to an external application module through the bus node module.
10. A tire pressure detection signal receiving method, characterized in that the method comprises:
the synchronous module receives the coded baseband signal of the tire pressure detection signal output by the radio frequency demodulation module, performs synchronous and filtering processing on the baseband signal and outputs the processed baseband signal;
the configuration module outputs a preset baud rate and a preset synchronous mode;
the detection module detects the processed baseband signal based on the preset baud rate and outputs an effective signal and an actual baud rate;
the clock generation module receives the preset baud rate or the actual baud rate and outputs a baud rate clock;
the frame synchronization module receives the effective signal and the baud rate clock, samples the effective signal based on the baud rate clock to obtain a sampling signal, matches the sampling signal with the preset synchronization mode, and outputs a buffer signal matched with the preset synchronization mode;
the decoding module receives the buffer signal and the baud rate clock, decodes the buffer signal based on the baud rate clock, and outputs decoded data;
the configuration module receives the decoded data and sends the decoded data to an application module.
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| DE102014112652A1 (en) * | 2014-01-17 | 2015-07-23 | Huf Hülsbeck & Fürst Gmbh & Co. Kg | Method for adapting a tire pressure monitoring device to a vehicle type and a tire pressure monitoring system with at least one tire pressure monitoring device and tire pressure monitoring device adaptable thereto by this method |
| EP3404873B1 (en) * | 2017-05-18 | 2019-10-02 | Melexis Technologies NV | Low-power data bus receiver |
| CN112534282A (en) * | 2018-06-14 | 2021-03-19 | 特克特朗尼克公司 | Integrated communication link testing |
| CN208805229U (en) * | 2018-10-12 | 2019-04-30 | 河北稳控科技有限公司 | A kind of Multidimensional Comprehensive measuring device having remote communicating function |
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