Mutual exclusion resource access method based on single-chip microcomputer platform without operating system

Abstract

A mutual exclusion resource access method based on a single-chip microcomputer platform without an operating system comprises the steps that a background program or low-priority interrupt sets a mutual exclusion lock for a mutual exclusion resource to be accessed before accessing the mutual exclusion resource; the high-priority interrupt interrupts the operation of the background program or the low-priority interrupt program, sets an interrupt return context, and closes the current interrupt, add a mutual exclusion resource waiting queue and sets a waiting resource context if detecting that amutual exclusion lock is valid before accessing the mutual exclusion resource, and then jumps to the interrupt return context to realize interrupt return; the background program or the low-priority interrupt restores operating, releases the mutual exclusion lock after accessing the mutual exclusion resources, and enables the high-priority interrupt in the mutual exclusion resource waiting queue; and the high-priority interrupt jumps to the waiting resource context, and if it is detected that the mutual exclusion lock is released, the mutual exclusion resource is accessed. According to the method, multitask synchronous access of mutually exclusive resources in a single-chip microcomputer platform without an operating system is realized.

Description

technical field [0001] The invention relates to the technique of multitasking accessing mutually exclusive resources. Background technique [0002] With the development of automated production lines, digital factories, etc., the real-time requirements for control and drive units are getting higher and higher. Most control units use real-time operating systems or microkernels to implement task scheduling and real-time control. Because the operating system or the microkernel itself will bring task jitter and delay, affecting real-time performance. [0003] In order to further improve real-time performance and reduce costs, most drive units and low-end control units are developed based on single-chip microcomputers, without an operating system, and adopt the method of interrupt program plus background program. Due to the high real-time performance of interrupts, it can be better Real-time control. Since there is no operating system, access to some mutually exclusive resource...

AI Technical Summary

Problems solved by technology

Since there is no operating system, access to some mutually exclusive resources (such as EEPROM, FRAM) becomes complicated and requires good reentrant code

Images