A method for multi-process interactive sharing of spi communication bus in embedded system

Abstract

The invention discloses a method for interactively sharing an SPI communication bus through embedded system multiple processes. The method comprises the following steps: (1) a system is initialized and the processes are built; (2) all kinds of SPI information are marked one by one by the system; (3) the processes respectively register required SPI information for the system; and (4) SPI information is respectively sent to each corresponding process by the system according to marks of the received SPI information. The method for interactively sharing the SPI communication bus through the embedded system multiple processes has the advantages that each process of an application layer is respectivley provided with an independent SPI communication queue, can respectivley register SPI information focused by the process according to requirements, and does not need to process interaction of other SPI information. Single-process SPI communication is not limited by other processes any more, whether the SPI information needs processing or not is completely not affected by other processes, and building of a process and exiting of the process are not affected by other processes. If an SPI information queue of a process is blocked, communication of other processes is completely not affected, and therefore system stability is improved.

Description

technical field [0001] The invention relates to a method for interactively sharing an SPI communication bus among multiple processes of an embedded system. Background technique [0002] In the prior art, the SPI communication of the interactive multi-process embedded multimedia system mostly adopts such as figure 1 System design scheme: System A is an embedded system without a display device, which mainly realizes functions such as driving and management of Tuner chip, driving and management of CD or DVD movement, power detection and management, detection and management of reversing, etc. And if these functions need to be displayed, another Arm-based multi-process multimedia embedded B system is required to complete. The embedded B system needs, in addition to completing its own tasks, it also needs to display and process all the functions of the A system. Show tasks. The communication between system A and system B has only one SPI communication bus, that is, the data exch...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of the SPI communication of the above-mentioned existing interactive multi-process embedded multimedia system, the present invention provides a design scheme for the multi-process interactive shared SPI communication bus of the embedded system

Images