Serial port upgrading method and system for multiple MCU slave stations

Abstract

The invention discloses a serial port upgrading method and system for multiple MCU slave stations, and belongs to the technical field of MCU upgrading, and the method comprises the following steps: all MCU slave stations are initialized to set a serial port analysis chip as read enabling, only after an upgrading frame of a corresponding slave station is obtained from an upper computer, the serial port analysis chip is set as write enabling when a reply frame is sent, and the serial port analysis chip is reset as read enabling immediately after sending is completed; therefore, the bus multiplexed by the plurality of MCU slave stations can complete data receiving and transmitting without generating conflicts; specifically, after a single MCU slave station obtains a complete upgrading file frame by frame, the MCU slave station copies the upgrading file to an application engineering storage area. By utilizing the method, a plurality of MCU slave stations can be simultaneously upgraded through a single serial port, all MCUs have the same priority in the system, the transmission speed is relatively high, the upgrading efficiency is high, the number of interfaces is not limited, the upgrading of other MCUs is not influenced when the upgrading of a single MCU fails, the stability is high, data conflicts can be avoided, and the upgrading risk is favorably reduced.

Description

technical field [0001] The invention relates to a serial port upgrading method and system of multiple MCU slave stations, and belongs to the technical field of MCU upgrading. Background technique [0002] In the actual use of embedded systems, there is often a need for upgrading. Among them, the iteration speed of software is usually much faster than that of hardware. When upgrading the software, it is costly and inconvenient to mail the hardware back to the manufacturer for upgrading; it is easy for users to disassemble the hardware and reprogram it by themselves, and it is easy to make mistakes in the upgrade. Therefore, the online upgrade technology (IAP, In Application Programming) is usually used in the market to add a bootloader project (boot project) in the MCU (micro control unit), allowing customers to directly use the original communication interface of the product to perform iterative software upgrades. [0003] In the prior art, the solution for upgrading a sin...

AI Technical Summary

Problems solved by technology

[0006] The first method has a low transmission speed. Assuming that the transmission time to an MCU slave station is t, the nth MCU slave station takes n*t to receive a frame, and the lower the MCU slave station is, the lower the upgrade efficiency is.

The transmission speed of the second method is higher than that of the first method, but the number of interfaces of the main MCU restricts the size of the system

In addition, both methods have the same problem, poor system stability, when the upgrade of the first MCU slave in the first method or the master MCU in the second method fails to work, other MCUs cannot be upgraded

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