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/*
* Spi.cpp
*
* Created on: 2 May 2017
* Author: jeremy
*/
#include "SpiDev.h"
#include <fcntl.h>
#include <linux/spi/spidev.h>
#include <sys/ioctl.h>
namespace IO
{
SpiDev::SpiDev(const std::string& name, size_t dev, size_t cs, size_t bits, uint8_t channels)
: name{name}, bus{dev}, cs{cs}, nBits{bits}, nChannels{channels}
{
this->devicePath = spiDevPath + std::to_string(dev) + "." + std::to_string(cs);
}
void SpiDev::Open(size_t freq, int mode) noexcept
{
this->clkFreq = freq;
this->fd = open(devicePath.c_str(), O_RDWR);
mode &= 3;
ioctl(this->fd, SPI_IOC_WR_MODE, &mode);
ioctl(this->fd, SPI_IOC_WR_BITS_PER_WORD, &bitsPerWord);
ioctl(this->fd, SPI_IOC_WR_MAX_SPEED_HZ, &this->clkFreq);
}
void SpiDev::Close() noexcept
{
if(fd != -1)
{
close(this->fd);
fd = -1;
}
return;
}
int SpiDev::DataRW(uint8_t* data, size_t len) const noexcept
{
spi_ioc_transfer spiData{};
spiData.tx_buf = reinterpret_cast<decltype(spiData.tx_buf)>(data);
spiData.rx_buf = reinterpret_cast<decltype(spiData.rx_buf)>(data);
spiData.len = len ;
spiData.speed_hz = this->clkFreq;
spiData.delay_usecs = 0;
spiData.bits_per_word = SpiDev::bitsPerWord;
spiData.cs_change = 0;
spiData.pad = 0;
return ioctl(this->fd, SPI_IOC_MESSAGE(1), &spiData);
}
} /* namespace IO */
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