Communication method of double-MCU (Microcontroller Unit)-architecture system updating program

Abstract

The invention discloses a communication method of a double-MCU (Microcontroller Unit)-architecture system updating program. The communication method comprises the following steps: defining four types of unit frames of 16-bit data width, wherein the unit frames are used as a minimum unit during disassembling and combination in a communication way that CAN (Controller Area Network) is transformed to SPI (Serial Peripheral Interface); filling a flow control instruction of a communication node and the effective information of an S19 file into the above frame types to form unit frames, and combining and filling every four unit frames to form one frame of CAN data field; and splitting the CAN data field by a transfer gateway, splitting and reducing each frame of CAN data field into four unit frames which are directly used as the SPI frames of double-MCU communication, analyzing the SPI frames by a communication terminal node to obtain effective data contained in an original S19 file, and updating a program. The communication method conforms to an interaction information protocol between a CAN message and the SPI frames in the multi-node networking of the double-MCU-architecture system, and the target code S19 (or Hex) file can be more effectively downloaded to a SMCU (Subsidiary Microcontroller Unit).

Description

technical field [0001] The invention relates to the communication field, in particular to a communication method for updating programs of a dual-MCU architecture system. Background technique [0002] Such as figure 1 As shown, the dual MCU control system often used in the structure of the automotive controller with dual MCU architecture collects signals independently from the main control chip (MMCU) and the auxiliary control chip (SMCU), and then passes the 16-bit data between the main and auxiliary The wide SPI communication method is used to complete the interaction and comparison of the two data, so as to realize the output jointly controlled by the dual MCU, and achieve a safer and more reliable control effect. At present, the MMCU upgrade program technology is mature and generally complies with BoschCAN specification 2.0B. The upper computer extracts the effective information in the program's target code S19 (or Hex) file, and completes the MMCU programming program in...

AI Technical Summary

Problems solved by technology

[0006] The main disadvantage of the above two methods is that it is impossible to realize the online refresh and upgrade of the SMCU software in the CAN network environment of the vehicle. The external network port or plug-in for programming is not reserved for SMCU, which is very inconvenient for software upgrades

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