A method and system for optimizing MCU communication by using GPIO

Abstract

The present invention provides a method for utilizing GPIO to optimize MCU communication. At least two MCUs need to be provided, and a GPIO connection is added between the two MCUs, and a master-slave mode is adopted in combination with a question-and-answer communication structure for communication. The method includes: setting Master-slave mode, to ensure that all data frames must be initiated by the master MCU. For the MCUs of both communication parties, the party whose GPIO is configured as input is used as the master MCU, and the party whose GPIO is configured as output is used as the slave MCU, so as to ensure that at the same time In the communication, there can only be one master and one slave; and there are event notification mechanism, asynchronous response mechanism, master-slave switching mechanism and big data transmission mechanism. The invention also provides a system for optimizing MCU communication by using GPIO, which satisfies the functions supported by the general protocol and the advantages of simplicity and high efficiency of the special protocol, and is applicable to both high-end and low-end MCUs.

Description

technical field [0001] The invention relates to the field of single-chip microcomputer communication, in particular to a method and system for optimizing MCU communication by utilizing GPIO. Background technique [0002] In the embedded field, there are cases where a product is configured with two or more MCUs. Taking POS products as an example, due to strict security requirements and limited types of MCUs with security configurations, they are often configured in one POS machine. Two MCUs, one is an ordinary MCU, which is mainly responsible for processing business, and the other is an MCU with security, which is mainly responsible for processing security. Compared with a single MCU, this multi-MCU usage scenario increases the requirement for cooperative work between MCUs. This requires the establishment of a set of communication protocols between MCUs to meet this requirement. For the communication requirements between MCUs, the general practice in the industry is: [00...

AI Technical Summary

Problems solved by technology

The disadvantage is that, except for the hardware communication interface, other resources of the MCU cannot be used, the protocol will inevitably be very complicated, and the requirements for development and maintenance personnel are relatively high

At the same time, the developed protocol program has relatively high requirements on MCU resources and operating speed, and cannot be applied to embedded products using low-cost MCUs.

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