SPI across two Arduino DUE's

mantoui · September 28, 2014, 4:58pm

Here is a simple DUE spislave.ino sketch, proof of concept,

manitou48/DUEZoo/blob/master/spislave.ino

// SPI slave for DUE, hack
//  master will lower CS and manage CLK
// MISO to MISO  MOSI to MOSI   CLK to CLK   CS to CS, common ground
//   http://forum.arduino.cc/index.php/topic,157203.0.html
// core hardware/arduino/sam/system/libsam/source/spi.c
// TODO:  C class, interrupt, FIFO/16-bit, DMA?

#include <SPI.h>

// assumes MSB
static BitOrder bitOrder = MSBFIRST;

void slaveBegin(uint8_t _pin) {
	SPI.begin(_pin);
	REG_SPI0_CR = SPI_CR_SWRST;     // reset SPI
	REG_SPI0_CR = SPI_CR_SPIEN;     // enable SPI
	REG_SPI0_MR = SPI_MR_MODFDIS;     // slave and no modefault
	REG_SPI0_CSR = SPI_MODE0;    // DLYBCT=0, DLYBS=0, SCBR=0, 8 bit transfer
}

This file has been truncated. show original

I've tested it with a maple (3.3v) master at various data rates, sending various number of bytes between SS LOW/HIGH.
sketch utilizes SPI library (SPI.begin(SS)) to get pins and such set up, then resets the SPI and enables it in slave mode.

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SPI across two Arduino DUE's

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