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/*
* Copyright (c) 2014 Daniel Tullemans <tully@be-lumino.us>
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
*/
#include "spidevice.h"
#include <sys/ioctl.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <linux/spi/spidev.h>
SpiDevice::SpiDevice(const char *devicePath, uint16_t delay, uint32_t speed, uint8_t wordLength)
:
_devicePath(devicePath),
_delay(delay),
_speed(speed),
_wordLength(wordLength),
_deviceHandle(0)
{
}
void SpiDevice::Open()
{
if(_deviceHandle == 0) {
_deviceHandle = open(_devicePath, O_RDWR);
if (_deviceHandle < 0)
{
perror("Couldn't open SPI device");
abort();
}
}
}
void SpiDevice::Close()
{
if(_deviceHandle != 0) {
close(_deviceHandle);
}
}
// badbadbad
uint8_t rx[32768] = {0, };
void SpiDevice::Transfer(const uint8_t buffer[], uint16_t length)
{
struct spi_ioc_transfer tr;
tr.tx_buf = (unsigned long)buffer;
tr.rx_buf = (unsigned long)rx;
tr.len = length;
tr.speed_hz = _speed;
tr.delay_usecs = _delay;
tr.bits_per_word = _wordLength;
int ret;
ret = ioctl(_deviceHandle, SPI_IOC_MESSAGE(1), &tr);
if (ret < 1)
{
perror("Couldn't send SPI message");
abort();
}
}