CN112445508A - ARM application program online upgrading method based on CAN bus - Google Patents
ARM application program online upgrading method based on CAN bus Download PDFInfo
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- CN112445508A CN112445508A CN202011113731.9A CN202011113731A CN112445508A CN 112445508 A CN112445508 A CN 112445508A CN 202011113731 A CN202011113731 A CN 202011113731A CN 112445508 A CN112445508 A CN 112445508A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F8/00—Arrangements for software engineering
- G06F8/60—Software deployment
- G06F8/65—Updates
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/08—Error detection or correction by redundancy in data representation, e.g. by using checking codes
- G06F11/10—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's
- G06F11/1004—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's to protect a block of data words, e.g. CRC or checksum
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/34—Network arrangements or protocols for supporting network services or applications involving the movement of software or configuration parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L2012/40208—Bus networks characterized by the use of a particular bus standard
- H04L2012/40215—Controller Area Network CAN
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Abstract
The invention provides a method for upgrading ARM application programs on line based on a CAN bus, which realizes the purpose of upgrading the ARM application programs on line through a CAN bus interface, enters a BOOT program, enters an on-line upgrading mode when an upgrading indicating signal is low level, finishes upgrading handshake when receiving an on-line upgrading instruction through the bus within a specified time, receives on-line upgrading data through the bus, acquires the number of upgrading data packets through a header file, starts counting operation, writes the received data into an off-chip SRAM (static random access memory) and performs CRC (cyclic redundancy check) on the upgrading data. The invention solves the problem of remote online upgrading of the ARM application program, simplifies the upgrading process of the product application program based on the ARM, effectively improves the product upgrading efficiency, and saves the labor, material resources and time cost.
Description
Technical Field
The invention relates to the field of electronic circuit design, in particular to an online application program upgrading method.
Background
ARM is a 32-bit reduced instruction set processor architecture, and is widely used in many embedded system designs. The method has the characteristics of fixed instruction length, high execution efficiency, small size, low power consumption, low cost, high performance and the like. ARM is usually composed of a control unit, an arithmetic logic unit and a register. The ARM is widely applied to products such as commercial microcontrollers, automobile control systems, motor control systems, large household appliance controllers, medical equipment, network equipment, airborne equipment and the like. Due to the characteristics of low cost, high performance and the like of the ARM, the ARM is more and more widely applied.
The ARM usually integrates a FLASH memory on chip for storing codes and data. The program updating process is a process for updating the application program stored in the FLASH. The ARM common program updating mode has two modes, the emulator is programmed through a serial JTAG interface, and the serial port is programmed in the system through the serial port. In both modes, an upgrade worker needs to arrive at the field to update the ARM program through the upgrade equipment, and certain inconvenience exists in upgrade.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a method for upgrading an ARM application program on line based on a CAN bus, which realizes the purpose of upgrading the ARM application program on line through a CAN bus interface.
The technical scheme adopted by the invention for solving the technical problem comprises the following steps:
step 1: after the ARM is powered on, the ARM enters a BOOT program, firstly, an upgrade indicating signal is judged, when the upgrade indicating signal is at a high level, the upgrade is not performed correspondingly, the program jumps to an application program, and when the upgrade indicating signal is at a low level, an online upgrade mode is entered;
step 2: in an online upgrading mode, ARM waits for an online upgrading instruction of a CAN bus, and when the upgrading instruction is not received within a specified time T, ARM reports an upgrading failure message through the bus, and upgrading fails; when an online upgrading instruction is received through the bus within a specified time T, upgrading handshake is completed, and the ARM waits for the bus to send an upgrading data packet;
and step 3: the ARM receives online upgrade data through a bus, acquires the number of upgrade data packets through a header file, starts counting operation, and writes the received data into an off-chip SRAM;
in order to ensure that the transmission process of the upgrade data is not changed, after the data is written into the SRAM, the ARM performs CRC on the upgrade data, compares the CRC result with the CRC result at the end of the upgrade file, and proves that the data is not changed when the comparison is consistent; if the comparison is inconsistent, reporting upgrading failure by the bus;
and 4, step 4: the ARM executes erasing operation on the application program in the chip, and writes the application upgrading data stored in the SRAM into the chip for storage after the erasing is finished;
after the writing is finished, the ARM reads back the upgrade data written in the chip and compares and checks the upgrade data with the upgrade data in the SRAM outside the chip, and after the comparison is correct, an upgrade success message is reported through the bus, so that the on-line upgrade of the ARM application program is finished.
The upgrade data packet is composed of 3 parts as shown in fig. 2, each 8 bytes is defined as 1 packet data, the upgrade data is composed of a header file, upgrade data and a CRC check result, the header file corresponds to the number of the online upgrade data packets, and the end of the data packet is the CRC check result.
The prescribed time T is 2S.
The invention has the advantages that the problem of remote online upgrading of the ARM application program is solved due to the adoption of the ARM online upgrading scheme based on the CAN bus, the upgrading process of the product application program based on the ARM is simplified, the upgrading efficiency of the product is effectively improved, and the labor, material and time costs are saved.
Drawings
FIG. 1 is a schematic block diagram of an ARM online upgrade of the present invention.
FIG. 2 is a diagram of upgrade data package composition according to the present invention.
FIG. 3 is a flowchart illustrating an ARM online upgrade process according to the present invention.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
Programs in the ARM are divided into a BOOT program and an application program, and the BOOT program is responsible for finishing the work of bus communication, upgrade state judgment, ARM application program upgrade data writing, data verification, state reporting and the like. And the ARM is electrified to enter a BOOT program, functions of receiving an upgrade data packet, checking data CRC, updating program data, comparing data and the like are completed according to the CAN bus instruction, and when the checking of the written program data is completed, the ARM application program is successfully upgraded.
Fig. 1 is a schematic block diagram of online upgrade, where an ARM receives data required for upgrade through a bus and completes upgrade of its own application program, and a specific upgrade flow is as follows:
a BOOT program and an application program exist in the ARM at the same time, the storage positions of the BOOT program and the application program are different, the program used for online upgrading is stored in the BOOT program, the storage positions of the BOOT program and the application program are different in storage, and the application program can be upgraded through the upgrading program in the BOOT.
The online upgrade flow chart is shown in fig. 3, and the detailed steps are as follows:
step 1: after the ARM is powered on, the ARM enters a BOOT program, firstly, an upgrade indicating signal is judged, when the upgrade indicating signal is at a high level, the upgrade is not performed correspondingly, the program jumps to an application program, and when the upgrade indicating signal is at a low level, an online upgrade mode is entered;
step 2: in the online upgrading mode, ARM waits for the online upgrading instruction of the CAN bus, and when the upgrading instruction is not received in 2S, ARM reports upgrading failure information through the bus, and upgrading fails; when an online upgrading instruction is received through the bus in 2S, upgrading handshake is completed, and the ARM waits for the bus to send an upgrading data packet;
and step 3: the ARM receives online upgrade data through a bus, acquires the number of upgrade data packets through a header file, starts counting operation, and writes the received data into an off-chip SRAM;
in order to ensure that the transmission process of the upgrade data is not changed, after the data is written into the SRAM, the ARM performs CRC on the upgrade data, compares the CRC result with the CRC result at the end of the upgrade file, and proves that the data is not changed when the comparison is consistent; if the comparison is inconsistent, reporting upgrading failure by the bus;
and 4, step 4: the ARM executes erasing operation on the application program in the chip, and writes the application upgrading data stored in the SRAM into the chip for storage after the erasing is finished;
after the writing is finished, the ARM reads back the upgrade data written in the chip and compares and checks the upgrade data with the upgrade data in the SRAM outside the chip, and after the comparison is correct, an upgrade success message is reported through the bus, so that the on-line upgrade of the ARM application program is finished.
The upgrade data packet is composed of 3 parts as shown in fig. 2, each 8 bytes is defined as 1 packet data, the upgrade data is composed of a header file, upgrade data and a CRC check result, the header file corresponds to the number of the online upgrade data packets, and the end of the data packet is the CRC check result.
Claims (3)
1. A method for upgrading ARM application program on line based on CAN bus is characterized by comprising the following steps:
step 1: after the ARM is powered on, the ARM enters a BOOT program, firstly, an upgrade indicating signal is judged, when the upgrade indicating signal is at a high level, the upgrade is not performed correspondingly, the program jumps to an application program, and when the upgrade indicating signal is at a low level, an online upgrade mode is entered;
step 2: in an online upgrading mode, ARM waits for an online upgrading instruction of a CAN bus, and when the upgrading instruction is not received within a specified time T, ARM reports an upgrading failure message through the bus, and upgrading fails; when an online upgrading instruction is received through the bus within a specified time T, upgrading handshake is completed, and the ARM waits for the bus to send an upgrading data packet;
and step 3: the ARM receives online upgrade data through a bus, acquires the number of upgrade data packets through a header file, starts counting operation, and writes the received data into an off-chip SRAM;
in order to ensure that the transmission process of the upgrade data is not changed, after the data is written into the SRAM, the ARM performs CRC on the upgrade data, compares the CRC result with the CRC result at the end of the upgrade file, and proves that the data is not changed when the comparison is consistent; if the comparison is inconsistent, reporting upgrading failure by the bus;
and 4, step 4: the ARM executes erasing operation on the application program in the chip, and writes the application upgrading data stored in the SRAM into the chip for storage after the erasing is finished;
after the writing is finished, the ARM reads back the upgrade data written in the chip and compares and checks the upgrade data with the upgrade data in the SRAM outside the chip, and after the comparison is correct, an upgrade success message is reported through the bus, so that the on-line upgrade of the ARM application program is finished.
2. The method for upgrading the ARM application program based on the CAN bus according to claim 1, wherein the method comprises the following steps:
the upgrade data packet is composed of 3 parts, each 8 bytes is specified as 1 packet data, the upgrade data is composed of a header file, upgrade data and a CRC (cyclic redundancy check) result, the header file corresponds to the number of the online upgrade data packets, and the CRC result is at the end of each data packet.
3. The method for upgrading the ARM application program based on the CAN bus according to claim 1, wherein the method comprises the following steps:
the prescribed time T is 2S.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113672271A (en) * | 2021-08-24 | 2021-11-19 | 天津津航计算技术研究所 | Domestic FPGA remote upgrading system and method |
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2020
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