DMA (direct memory access)-based SPI (serial peripheral interface) data transmission method and DMA-based SPI data transmission device

Abstract

The invention relates to a DMA (direct memory access)-based SPI (serial peripheral interface) data transmission method and a DMA-based SPI data transmission device. The method includes the steps: configuring a DMA controller for an SPI; and loading / downloading bootstrap program codes by means of SPI data transmission between an external memory device and an RAM (random access memory) through the DMA controller. By means of introducing a DMA mechanism and combining an SPI serial bus, when the bootstrap program codes are loaded / downloaded, the DMA controller controls data to be directly transmitted, and control power of an MCU (microcontroller unit) is released during data transmission, so that accuracy and continuous reading / writing of a bootstrap program are guaranteed, transmission reliability of the bootstrap program is enhanced, and systematic transmission efficiency is improved. The method is capable of flexibly supporting various communication protocols based on the SPI by means of DMA and is compatible with program code constitutions of different types, so that configurability of the systematic data transmission is enhanced.

Description

technical field [0001] The present invention relates to the field of computer technology, in particular to a DMA (Direct Memory Access, Direct Memory Access)-based SPI (Serial Peripheral Interface, Serial Peripheral Interface) data transmission method and device for loading / or starting program codes. Background technique [0002] At present, in an embedded system, when the system is powered on, it is necessary to boot the loader to initialize the hardware device and complete the memory space mapping, so that the system enters a suitable software and hardware environment. The boot loader is usually written in some solid-state storage devices in the system, such as ROM (Read-Only Memory, read-only memory) or Flash (Flash Memory, flash memory). Therefore, reliable and error-free data exchange is required between the solid-state storage device and RAM (random access memory, random access memory). [0003] The current general method includes using NAND FLASH / NOR FLASH to load th...

AI Technical Summary

Problems solved by technology

[0003] The current common method includes using NAND FLASH / NOR FLASH to load the startup program. By loading the startup program, the MCU (MicroControllerUnit, microcontroller) controls the loading process, due to a large number of interrupt loads of the CPU (Central Processing Unit, central processing unit) And interrupt processing affects the loading efficiency, further reduces the system efficiency, and also affects the reliability of data code transmission

Images