A serial communication baud rate adaptive data recording unit and its implementation method

Abstract

This invention relates to the field of data recording in railway locomotive wireless communication equipment, and provides a serial communication baud rate adaptive data recording unit and its implementation method. The unit includes a main processor module, a serial port interface, an audio encoding / decoding module, a clock module, a data storage module, non-volatile storage, and an external expansion storage module, constituting a data recording and communication processing unit. The main processor module processes communication messages and audio data from the main control unit of the locomotive integrated wireless communication equipment, and generates a time-stamped data storage format based on time information provided by the clock module, storing it in the data storage module. The non-volatile storage module stores management information such as the data recording address. A baud rate adaptive method based on a query-response mechanism is adopted, enabling automatic switching between a first baud rate and a second baud rate in serial communication, thereby alleviating the buffer accumulation problem caused by a fixed baud rate and improving communication efficiency and data recording quality.

Description

Technical Field

[0001] This invention relates to the field of data recording technology for railway locomotive wireless communication equipment, and particularly to a serial communication baud rate adaptive data recording unit and its implementation method. Background Technology

[0002] The locomotive integrated wireless communication equipment (CIR) is an important component of the railway dispatching communication system and a crucial device for ensuring train operation safety. To ensure the normal operation of the locomotive integrated wireless communication equipment, a data logging unit is typically installed to record and store CIR operation information, operating status information, and voice communication information, providing a basis for equipment maintenance, fault analysis, and event tracing.

[0003] In existing technologies, the data recording unit typically communicates with the main control unit of the locomotive integrated wireless communication equipment via a serial port to transmit service data and control information. With the development of railway communication services, the types of data that the main control unit of the locomotive integrated wireless communication equipment needs to process and transmit are constantly increasing, as is the data volume. This includes scheduling communication data, control command information, and voice-related data, placing higher demands on the communication capabilities between the main control unit and the data recording unit.

[0004] However, the serial communication baud rate used between the existing main control unit and the data recording unit is usually fixed. While it can meet the basic data transmission requirements when the amount of business data is small, it is prone to insufficient data transmission efficiency when the business is in high demand or the amount of data increases. This may lead to communication buffer accumulation, or even data loss or incomplete recording, thus affecting the complete storage of communication data and voice data by the data recording unit.

[0005] Therefore, without changing the overall structure and communication method of the existing equipment, how to improve the adaptability and communication efficiency of serial communication between the main control unit and the data recording unit has become an urgent issue to be addressed in the existing technology. Summary of the Invention

[0006] Given that existing technologies use a fixed serial communication baud rate between the main control unit and the data recording unit of locomotive integrated wireless communication equipment, problems such as decreased communication efficiency, buffer accumulation, and even incomplete data recording easily arise when the amount of service data increases. This invention aims to improve the adaptability and data transmission efficiency of serial communication without changing the overall structure and communication method of the existing equipment. To this end, a serial communication baud rate adaptive data recording unit and its implementation method are proposed. By introducing a multi-baud rate negotiation and switching mechanism between the data recording unit and the main control unit of the locomotive integrated wireless communication equipment, the serial communication can automatically adjust between at least two preset baud rates according to the communication status, thereby alleviating serial port queue congestion, improving communication reliability, and ensuring the continuity and integrity of communication data and voice data recording.

[0007] The technical solution adopted in this invention is: a serial communication baud rate adaptive data recording unit, comprising a main processor module, a serial port interface, an audio codec module, a clock module, a data storage module, a non-volatile storage module, and an external expansion storage module; the main processor module is connected to the serial port interface, the audio codec module, the clock module, the data storage module, the non-volatile storage module, and the external expansion storage module respectively; the audio codec module is also connected to the main control unit of the locomotive integrated wireless communication equipment, thereby forming an integrated data recording and communication processing unit; the main processor module is used to complete serial communication management, serial communication baud rate adaptive control, and processing of communication messages and audio data; the serial port... The interface is used to establish serial communication between the main processor module and the main control unit of the locomotive integrated wireless communication equipment, and supports different serial communication baud rate configurations to cooperate with baud rate adaptive control; the audio codec module is used to receive the analog audio signal output by the main control unit of the locomotive integrated wireless communication equipment and convert it into a digital audio signal for processing by the main processor module; the clock module is used to provide the main processor module with current time information and temperature information, and the main processor module timestamps the communication message data and audio data according to the time information and generates the corresponding data storage format; the data storage module is used to store the communication message storage format data and audio storage format data processed by the main processor module. The non-volatile storage module stores data recording addresses and recording management information to ensure data recording continues after power failure or restart. The external expansion storage module expands the system's runtime data cache space to reduce write pressure on the main memory and enables the main processor module to automatically switch between at least two preset baud rates via serial communication baud rate adaptive control based on a query-response mechanism. This improves the reliability of serial communication with the locomotive integrated wireless communication equipment's main control unit and ensures continuous data recording. The main processor module is configured to send serial port data to the locomotive integrated wireless communication equipment's main control unit at preset time intervals at the current serial communication baud rate. The system queries information and initiates response detection after each transmission. During the response detection period, it monitors the serial port receive buffer and determines whether complete and correctly formatted query and response data has been received. When complete and correctly formatted query and response data is received, the system determines that the current serial communication baud rate is valid and clears the non-response count counter. When no complete and correctly formatted query and response data is received, the system accumulates the number of non-response counts and controls the serial communication baud rate to switch between a first baud rate and a second baud rate when the number of non-response counts reaches a preset threshold. After the switch is completed, the response detection is re-executed to verify the validity of the switched serial communication baud rate, thereby achieving adaptive negotiation of the serial communication baud rate.

[0008] The serial communication baud rate adaptive data recording unit implementation method of this invention is as follows: When the data recording unit is powered on, the main processor module initializes the serial communication baud rate to the first baud rate and initializes the non-response count counter; the main processor module sends serial port query information to the main control unit of the locomotive integrated wireless communication equipment at preset time intervals, and starts response detection after each query information is sent; during the response detection period, the main processor module listens to the serial port received data and determines whether complete and correctly formatted query response data has been received; when query response data is received, the main processor module determines that the current serial communication baud rate is valid, clears the non-response count counter, and maintains the current baud rate. The serial communication baud rate is adjusted as follows: When no query response data is received, the main processor module accumulates the number of unanswered queries and performs a serial communication baud rate switch when the number of unanswered queries reaches a preset threshold. During the serial communication baud rate switch, the main processor module switches between a first baud rate and a second baud rate based on the current serial communication baud rate, and clears the unanswered query counter after the switch is completed. Under the switched serial communication baud rate, the main processor module continues to perform query response detection to verify the validity of the switched serial communication baud rate, thereby realizing adaptive negotiation of the serial communication baud rate between the data recording unit and the main control unit of the locomotive integrated wireless communication equipment.

[0009] The beneficial effects of this invention are as follows: By setting up a data recording unit, the communication data and audio data of the main control unit of the locomotive integrated wireless communication equipment are accurately and completely recorded, providing reliable data support for equipment operation status analysis, fault diagnosis, and event tracing. By introducing a serial port communication baud rate adaptive mechanism between the data recording unit and the main control unit of the locomotive integrated wireless communication equipment, the serial port can automatically adjust its operating baud rate according to the communication status, effectively improving the data transmission capability of serial communication and avoiding communication buffer accumulation and serial port queue congestion problems caused by a fixed baud rate, thereby improving communication efficiency and overall machine performance. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the system connection of the present invention; Figure 2 This is a flowchart of the serial communication baud rate adaptive method of the present invention. Detailed Implementation

[0011] To better understand the present invention, the invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0012] like Figure 1As shown, the serial communication baud rate adaptive data recording unit provided by this invention includes a main processor module, a serial port interface, an audio codec module, a clock module, a data storage module, a non-volatile storage module, and an external expansion storage module. The main processor module is connected to the serial port interface, audio codec module, clock module, data storage module, non-volatile storage module, and external expansion storage module. The serial port interface enables serial communication between the main processor module and the main control unit of the locomotive integrated wireless communication equipment. The audio codec module is connected to the main control unit to receive audio signals and convert analog audio signals into digital audio signals for processing by the main processor module, thereby enabling data interaction between the main control unit's audio signals and the main processor module. The clock module provides time information to the main processor module. The data storage module and non-volatile storage module store communication data and record management information, respectively. The external expansion storage module expands the data buffer space of the main processor module, thus forming a complete data recording and communication processing unit.

[0013] In this embodiment, the main processor module is implemented using a microprocessor chip of model MIMXRT1062CVL5B, which is used to complete serial communication management, baud rate adaptive control and data processing functions. Without changing the above-mentioned function implementation method, the main processor module can also be implemented using other microprocessor chips with the same or similar functions.

[0014] The main processor module logically includes an interrogation sending unit, an response detection unit, a non-response counting unit, and a baud rate switching control unit. The interrogation sending unit sends serial port interrogation information to the main control unit of the locomotive integrated wireless communication equipment at preset time intervals under the current serial communication baud rate. The response detection unit determines whether complete and correctly formatted interrogation response data has been received within a preset response detection period. The non-response counting unit accumulates the number of times valid interrogation response data has not been received. The baud rate switching control unit controls the serial communication baud rate to switch between a first baud rate and a second baud rate when the number of non-response counts reaches a preset threshold, and re-triggers response detection after the baud rate switch to verify the validity of the current baud rate.

[0015] The audio codec module is connected to the main processor module via an I2C interface and a SAI interface. The I2C interface is used to transmit control commands, and the SAI interface is used to transmit digital audio data. In this embodiment, the audio codec module is implemented using a TLV320AIC3106 audio codec chip, which converts the analog audio signal output by the main control unit of the locomotive integrated wireless communication equipment into a digital audio signal and sends the converted digital audio signal to the main processor module.

[0016] The clock module is connected to the main processor module via an I2C interface. In this embodiment, the clock module uses a DS3232SN real-time clock chip to provide current time information and store year, month, day, hour, minute, second, and temperature information. Without changing the implementation method of time information acquisition, the clock module can also be implemented using other real-time clock chips with the same or similar functions.

[0017] The data storage module is connected to the main processor module via a uSDHC interface to enable data writing and reading. In this embodiment, the data storage module uses a FEMDRW008G memory chip to store communication message data and audio data; however, without changing the data storage function implementation, the data storage module can also be implemented using other memory chips with the same or similar functions.

[0018] The non-volatile memory module is connected to the main processor module via an I2C interface. In this embodiment, the non-volatile memory module uses an FM24CL64B non-volatile memory chip to store data record addresses and data record numbers, ensuring that the data recording unit can continue recording data after power failure or restart. Without changing the implementation method of the non-volatile data storage function, the non-volatile memory module can also be implemented using other non-volatile memory chips with the same or similar functions.

[0019] The external expansion storage module is connected to the main processor module via the SEMC interface. In this embodiment, the external expansion storage module uses an SDRAM chip of model MT48LC16M16A2P-6AIT to expand the data cache space during system operation and reduce the write pressure on the main memory. Without changing the implementation method of the cache expansion function, the external expansion storage module can also be implemented using other memory chips with the same or similar functions.

[0020] Without changing the way the above functions are implemented, the above functional modules can also be implemented using other devices or chips with the same or similar functions.

[0021] During the operation of the data recording unit, the main control unit of the locomotive integrated wireless communication equipment sends communication messages to the data recording unit via a serial port interface. Upon receiving a communication message, the main processor module parses the message data, reads the current time information through the clock module, encapsulates the message data, data number, and time information into a communication message storage format, and writes it into the data storage module. After completing one communication message recording, the main processor module updates the current data recording address and writes the updated address into the non-volatile storage module, ensuring that each communication message corresponds to a unique data recording address.

[0022] When the main control unit of the locomotive's integrated wireless communication equipment conducts voice communication, the audio codec module converts the analog audio signal into a digital audio signal and sends it to the main processor module via the SAI interface. Upon receiving the digital audio data, the main processor module reads the current time information through the clock module, encapsulates the audio data, voice number, and time information into audio storage format data, and writes it into the data storage module. After a voice communication session ends, the main processor module updates the audio data recording address and writes the updated address into the non-volatile storage module.

[0023] In the above structure, the main processor module in the data recording unit automatically switches between at least two preset baud rates through serial communication baud rate adaptive control based on an interrogation-response mechanism. The serial port interface is configured to support different serial communication baud rates to cooperate with the baud rate adaptive control. When processing communication message data and audio data, the main processor module timestamps the communication message data and audio data based on the current time information provided by the clock module, generates corresponding communication message storage format data and audio storage format data, and stores them in the data storage module. The non-volatile storage module is used to store the corresponding data recording address and recording management information. The external expansion storage module is used to expand the data cache space during system operation and reduce the write pressure on the main memory. Thus, even in the case of fixed baud rate mismatch, the reliability of serial communication with the main control unit of the locomotive integrated wireless communication equipment can still be maintained through baud rate adaptive negotiation, and the continuity of the data recording process can be guaranteed.

[0024] like Figure 2As shown, taking the use of two preset baud rates as an example, the data recording unit of this invention adopts a serial communication baud rate adaptive method based on an interrogation and response mechanism. This method includes the following steps: When the data recording unit is powered on, the main processor module initializes the serial communication baud rate connected to the main control unit of the locomotive integrated wireless communication equipment to the first baud rate and initializes a counter for the number of unanswered responses; the main processor module sends serial port interrogation information to the main control unit of the locomotive integrated wireless communication equipment at preset time intervals, and starts an response detection timer after each transmission of the serial port interrogation information. During the response detection timer period, it monitors the serial port receive buffer and determines whether complete and correctly formatted interrogation and response data has been received; when the response... When a complete and correctly formatted query-response data is received within the response detection timing period, the main processor module determines that the current serial communication baud rate is valid, clears the non-response count counter to zero, and maintains the current serial communication baud rate unchanged. When no complete and correctly formatted query-response data is received within the response detection timing period, the main processor module increments the non-response count counter by one and determines whether the number of non-response counts has reached a preset threshold. When the number of non-response counts has not reached the preset threshold, the current serial communication baud rate remains unchanged, and the module returns to continue sending serial port query information and performing response detection at preset time intervals. When the number of non-response counts reaches the preset threshold, the main processor module enters the baud rate switching determination process. The system determines whether the current serial communication baud rate is the first baud rate. If it is, it indicates that the first baud rate is invalid and cannot meet the communication requirements. Therefore, the serial communication baud rate is switched to the second baud rate, and the non-acknowledgment count counter is cleared. If the serial communication baud rate is not the first baud rate, it indicates that the currently used second baud rate is invalid and cannot meet the communication requirements. Therefore, the serial communication baud rate is switched back to the first baud rate, and the non-acknowledgment count counter is cleared. After completing the serial communication baud rate switch, the main processor module resends serial port query information at preset time intervals and performs response detection at the switched baud rate to verify the stability of the switched serial communication baud rate, thereby achieving adaptive negotiation of the serial communication baud rate between the first and second baud rates. It should be noted that, since this invention employs at least two preset baud rates, both of which may be effective under different communication conditions, the main processor module switches between the first and second baud rates to try another potentially applicable baud rate. This switching process is not a baud rate upgrade or downgrade, but rather a means to quickly restore the normal working state of the serial communication link. After the switch is complete, the main processor module clears the non-responder count counter and continues to perform query response detection to verify whether the switched baud rate is effective, thereby ensuring the reliability of serial communication and the continuity of data recording.

[0025] In the above embodiments, the preset time interval, the response detection timing period, and the threshold for the number of non-response times are all configurable parameters, and the main processor module can set or adjust the above parameters according to the communication stability or system operating status.

[0026] In one embodiment, the implementation method of the serial communication baud rate adaptive data recording unit includes the following steps: S01. When the data recording unit is powered on, the main processor module initializes the serial communication baud rate connected to the main control unit of the locomotive integrated wireless communication equipment to the first baud rate, and initializes the counter for the number of unanswered calls. The first baud rate is 19200bps.

[0027] S02. The main processor module sends serial port query information to the main control unit of the locomotive integrated wireless communication equipment at preset time intervals, and starts the response detection timer after each serial port query information is sent. In this embodiment, the query interval period is 5 seconds.

[0028] S03. During the response detection timing period, the main processor module listens to the serial port receive buffer and determines whether complete and correctly formatted query response data has been received.

[0029] S04. When a complete and correctly formatted query response data is received within the response detection timing period, the main processor module determines that the current serial communication baud rate is valid, clears the non-response count counter to zero, maintains the current serial communication baud rate, and returns to step S02.

[0030] S05. When no complete and correctly formatted query response data is received within the response detection timing period, the main processor module increments the non-response count counter by one and determines whether the number of non-response counts has reached the preset threshold, which is 3 times.

[0031] S06. When the number of unanswered attempts does not reach the preset threshold, the main processor module keeps the current serial communication baud rate unchanged, returns to step S02, and continues to perform query and response detection.

[0032] S07. When the number of unanswered calls reaches the preset threshold, the main processor module enters the baud rate switching determination process to determine whether the current serial communication baud rate is the first baud rate.

[0033] S08. When the serial communication baud rate is the first baud rate, the main processor module switches the serial communication baud rate to the second baud rate, which is 115200bps, and clears the counter for the number of unanswered calls.

[0034] S09. When the serial communication baud rate is not the first baud rate, the main processor module switches the serial communication baud rate to the first baud rate and clears the counter for the number of unanswered calls.

[0035] S10. After completing the serial communication baud rate switching, the main processor module re-executes steps S02 to S06 at the switched serial communication baud rate to verify the stability of the switched serial communication baud rate.

[0036] In the above embodiments, after the serial communication baud rate switching is completed, if no valid query response data is received multiple times at the switched baud rate, the main processor module can continue to maintain the current baud rate and perform query response detection, or execute the baud rate switching process again, so as to avoid frequent switching due to instantaneous communication abnormalities, which would affect the stability of system operation.

Claims

1. A serial communication baud rate adaptive data recording unit, characterized in that, The system includes a main processor module, a serial port interface, an audio codec module, a clock module, a data storage module, a non-volatile memory module, and an external expansion memory module. The main processor module is connected to the serial port interface, the audio codec module, the clock module, the data storage module, the non-volatile memory module, and the external expansion memory module. The audio codec module is also connected to the main control unit of the locomotive integrated wireless communication equipment, thus forming an integrated data recording and communication processing unit. The main processor module is used to perform serial communication management, serial communication baud rate adaptive control, and processing of communication messages and audio data. The serial port interface is used to establish serial communication between the main processor module and the main control unit of the locomotive integrated wireless communication equipment, and supports different serial communication baud rate configurations to cooperate with the baud rate adaptive control; the audio codec module is used to receive the analog audio signal output by the main control unit of the locomotive integrated wireless communication equipment and convert it into a digital audio signal for processing by the main processor module; the clock module is used to provide the main processor module with current time information and temperature information, and the main processor module timestamps the communication message data and audio data according to the time information and generates corresponding data storage formats; the data storage module is used to store the communication message storage format data and audio storage format data processed by the main processor module; The non-volatile storage module stores data recording addresses and recording management information to ensure continued data recording after power failure or restart. The external extended storage module expands the data cache space during system operation and enables the main processor module to automatically switch between at least two preset baud rates through adaptive control of the serial communication baud rate based on an interrogation-response mechanism. The main processor module is configured to: send serial port interrogation information to the main control unit of the locomotive integrated wireless communication equipment at preset time intervals under the current serial communication baud rate, and initiate response detection after each transmission; monitor the serial port receive buffer during the response detection period and determine whether complete and correctly formatted interrogation-response data has been received; when complete and correctly formatted interrogation-response data is received, determine that the current serial communication baud rate is valid and clear the non-response count counter; when no complete and correctly formatted interrogation-response data is received, accumulate the non-response count, and when the non-response count reaches a preset threshold, control the serial communication baud rate to switch between a first baud rate and a second baud rate, and re-execute the response detection after the switch to verify the validity of the switched serial communication baud rate, thereby achieving adaptive negotiation of the serial communication baud rate.

2. The serial communication baud rate adaptive data recording unit according to claim 1, characterized in that, The main processor module is implemented using a MIMXRT1062CVL5B microprocessor chip; the audio codec module is implemented using a TLV320AIC3106 audio codec chip, which connects to the main processor module via an I2C interface to receive control commands and via a SAI interface to transmit digital audio data; the clock module is implemented using a DS3232SN real-time clock chip and connects to the main processor module via an I2C interface; the data storage module is implemented using a FEMDRW008G memory chip and connects to the main processor module via a uSDHC interface; the non-volatile memory module is implemented using an FM24CL64B non-volatile memory chip and connects to the main processor module via an I2C interface; and the external expansion memory module is implemented using an MT48LC16M16A2P-6AIT SDRAM chip and connects to the main processor module via an SEMC interface.

3. A method for implementing a serial communication baud rate adaptive data recording unit, characterized in that, Includes the following steps: When the data recording unit is powered on, the main processor module initializes the serial communication baud rate to the first baud rate and initializes the counter for the number of unanswered calls. The main processor module sends serial port query information to the main control unit of the locomotive integrated wireless communication equipment at preset time intervals, and initiates response detection after each sending of the query information; During the response detection period, the main processor module listens for data received via the serial port and determines whether it has received complete and correctly formatted query response data. When a complete and correctly formatted query response is received, the main processor module determines that the current serial communication baud rate is valid, clears the counter for the number of unanswered queries, and maintains the current serial communication baud rate. When no complete and correctly formatted query response data is received, the main processor module accumulates the number of unresponded attempts and performs serial communication baud rate switching when the number of unresponded attempts reaches a preset threshold. When performing serial communication baud rate switching, the main processor module switches between a first baud rate and a second baud rate based on the current serial communication baud rate: when the current serial communication baud rate is the first baud rate, it switches to the second baud rate; when the current serial communication baud rate is not the first baud rate, it switches to the first baud rate; and after completing the switching, it clears the unanswered count counter. Under the switched serial communication baud rate, the main processor module continues to perform query-response detection to verify the effectiveness of the switched serial communication baud rate.

4. The implementation method of the serial communication baud rate adaptive data recording unit according to claim 3, characterized in that, The implementation method specifically includes the following steps: S01. When the data recording unit is powered on, the main processor module initializes the serial communication baud rate connected to the main control unit of the locomotive integrated wireless communication equipment to the first baud rate, and initializes the counter for the number of unanswered calls. S02. The main processor module sends serial port query information to the main control unit of the locomotive integrated wireless communication equipment at preset time intervals, and starts the response detection timer after each time the query information is sent. S03. During the response detection timing period, the main processor module listens to the serial port receive buffer and determines whether complete and correctly formatted query response data has been received. S04. When a complete and correctly formatted query response data is received within the response detection timing period, the main processor module determines that the current serial communication baud rate is valid, clears the non-response count counter to zero, maintains the current serial communication baud rate, and returns to step S02. S05. If no complete and correctly formatted query response data is received within the response detection timing period, the main processor module increments the non-response count counter by one and determines whether the number of non-response counts has reached the preset count threshold. S06. When the number of unanswered attempts does not reach the preset threshold, the main processor module keeps the current serial communication baud rate unchanged, returns to step S02, and continues to perform query response detection. S07. When the number of unanswered calls reaches the preset threshold, the main processor module enters the baud rate switching determination process to determine whether the current serial communication baud rate is the first baud rate. S08. When the serial communication baud rate is the first baud rate, the main processor module switches the serial communication baud rate to the second baud rate and clears the count of unanswered calls. S09. When the serial communication baud rate is not the first baud rate, the main processor module switches the serial communication baud rate to the first baud rate and clears the count of unanswered calls. S10. After completing the serial communication baud rate switching, the main processor module re-executes steps S02 to S06 at the switched serial communication baud rate to verify the stability of the switched serial communication baud rate.

5. The implementation method of the serial communication baud rate adaptive data recording unit according to claim 3, characterized in that: The first baud rate is 19200bps, the second baud rate is 115200bps, the preset time interval is 5 seconds, and the preset number threshold is 3 times.

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