STM32F4 SPI with DMA

Extension of the STM32 Arduino core SPI library with DMA support for F4 devices, such as the Black Pill. Tested with version 2.3.0 of the Arduino core.

Usage

In place of the transfer or transfer16 method of the SPI class, use DMAtransfer or DMAtransfer16. The DMA controller is set up before each transfer and disconnected from the SPI interface afterwards, so DMA and non-DMA transfers can be mixed in the same application.

Example:

#include <STM32F4_SPI_DMA.h>

// Create a class that can be used in place of SPIClass.
// The mosi/miso/sclk pins must match one of the hardware SPI instances.
SPIDMAClass _spi(mosi, miso, sclk);

// Transfer some data
uint8_t data;
_spi.DMAtransfer(data);

uint16_t value;
_spi.DMAtransfer16(value);

// Transfer a larger buffer of data
uint8_t buffer[100];
_spi.DMAtransfer(buffer, sizeof(buffer));

Current limitations

• Transfer only, use the non-DMA methods if receive is needed.
• Only tested with a Black Pill, STM32F401CC.

License

This worked is licensed under the Apache License, version 2.0.