DMA-based SPI communication method, electronic device, storage medium, and device

Abstract

The invention provides a SPI communication method based on DMA, comprising the following steps: after the processor is powered on, the SPI interface is initialized; the processor initializes the receiving and transmitting configurations of the DMA; a main program of the processor cycle to detect the SPI interface, when the main program of the processor detects the data to be sent, the DMA is started to send the data to be sent in parallel, and when the data to be sent is finished, the DMA generates a transmission completion interrupt; a main program of the processor cycle to detect the SPI interface, when the main program of the processor detects the data to be receive, the DMA is started to receive the data to be received in parallel, and when the data to be received is received, the DMAgenerates a reception completion interrupt. The present invention relates to an electronic device and a readable storage medium for performing the method described above. The invention also relates toa DMA-based SPI communication device. The invention adopts the DMA technology and the interrupt generated by the DMA to enable the main program of the processor to quickly fetch the data and processthe data in the interrupt service program, thereby obviously reducing the time resource occupying of the single chip microcomputer.

Description

technical field [0001] The invention relates to the technical field of computers, in particular to a DMA-based SPI communication method, electronic equipment, storage media and devices. Background technique [0002] In the single-chip microcomputer system, there are usually many external chips connected to the single-chip microcomputer. These external chips can realize a specific function that the single-chip microcomputer cannot realize, such as data memory, temperature sensor, Ethernet network communication, etc. The single-chip microcomputer communicates with the external chip through a specific interface protocol, such as the SPI interface protocol, so as to achieve the purpose of controlling the external chip. Therefore, the speed and efficiency of the interface protocol for communicating with external chips is very important. [0003] At present, most single-chip microcomputers do not have integrated DMA function. The SPI communication method with external chips is us...

AI Technical Summary

Problems solved by technology

The program communication speed and efficiency of this method are very low, occupying a large amount of time resources of the single-chip microcomputer, causing the running speed of the single-chip microcomputer to slow down, and when the function of the product is more complicated or there are many transactions to be processed, the SPI communication with the external chip cannot be realized.

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