CANOPEN-protocol-based embedded software upgrading method

Abstract

The invention relates to a CANOPEN-protocol-based embedded software upgrading method. The method is applied to a system formed by an upper computer and a lower computer which are in network connection through a CAN bus. The method comprises the following steps: connecting the upper computer and the lower computer, and confirming the effectiveness of the programming address after the successful connection; adopting a block transmission mechanism in an SDO protocol when the effectiveness is ensured; sending the block data in a subpackage way until all data of the application program are sent; afterwards, skipping to the application program area of a storer to implement the application program to complete the program upgrading. Compared with the prior art, the method has the advantages of strong anti-interference ability, high transmission rate, wide application range, convenience in follow-up development, and the like.

Description

technical field [0001] The present invention relates to one, in particular to an embedded software upgrading method based on the CANOPEN protocol. Background technique [0002] Bootloader, also known as the boot loader, is the first piece of software code that runs after the system is powered on. It can realize the two functions of booting the user program and firmware self-update. The firmware self-update needs to provide an additional data transmission medium to the chip so that the chip can write the received machine code into its own Flash. The traditional method is to use the UART interface to implement the update function of the Bootloader. The communication rate is low, usually only tens of KBPS, and the upgrade efficiency is low; due to the UART communication method, the communication signal has poor anti-interference ability, especially in the case of serious electromagnetic interference. car operating environment. The traditional method is not suitable for fieldb...

AI Technical Summary

Problems solved by technology

The traditional method is to use the UART interface to implement the update function of the Bootloader. The communication rate is low, usually only tens of KBPS, and the upgrade efficiency is low; due to the UART communication method, the communication signal has poor anti-interference ability, especially in the case of serious electromagnetic interference. car operating environment

The traditional method is not suitable for fieldbus upgrades, especially when multiple terminals work in the same network. When upgrading, the terminal to be upgraded needs to be disconnected from the entire network bus system for separate upgrades, which is not suitable for field upgrades. Especially in automobiles, due to the compact space of the automobile, the installation space of each terminal is narrow, and it is not easy to disassemble; moreover, the communication protocols in the traditional method are self-defined, the scope of use is small, and it is not universal

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