TsyDMASPI

This is SPI library using DMA buffer for Teensy, inspired by @crteensy 's DmaSpi and its @KurtE 's fork for Teensy 4.0.

Feature

• support DMA buffer (more than 64 byte transfer is available)
• Master has two ways to send/receive transactions
  • transfer() to send/receive transaction one by one
  • queue() and yield() to send/receive multiple transactions at once

WARNING

This library currently supports only Teensy 4.0.

Usage

#include <TsyDMASPI.h>

#define PIN_CS 10
#define DMASIZE 8192
uint8_t src[DMASIZE];
volatile uint8_t dest[DMASIZE];
volatile uint8_t dest1[DMASIZE];

void setup() {
    TsyDMASPI0.begin(PIN_CS, SPISettings(4000000, MSBFIRST, SPI_MODE3));

    // one by one transaction
    TsyDMASPI0.transfer(src, dest, DMASIZE);
    
    // multiple transaction at once
    TsyDMASPI0.queue(src, dest, DMASIZE);
    TsyDMASPI0.queue(src, dest1, DMASIZE);
    TsyDMASPI0.yield();
}

One by One transfer

// SPI with DMA on SPI0
TsyDMASPI0.begin(PIN_CS, SPISettings(4000000, MSBFIRST, SPI_MODE3));
TsyDMASPI0.transfer(tx_buf, rx_buf, DMASIZE);

Multiple queued transfer

// SPI with DMA on SPI0
TsyDMASPI0.begin(PIN_CS, SPISettings(4000000, MSBFIRST, SPI_MODE3));
TsyDMASPI0.queue(tx_buf0, rx_buf0, DMASIZE);
TsyDMASPI0.queue(tx_buf1, rx_buf1, DMASIZE);
TsyDMASPI0.yield(); // wait until all transactions will be done

TODO (PR Welcome!!)

• Teensy LC, 3.2, 3.5, 3.6 implementation
• Slave mode with DMA for example like this thread

Embedded Libraries

• TeensyDirtySTLErrorSolution v0.1.0

License

MIT