hyperion.ng/libsrc/leddevice/LedSpiDevice.cpp

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// STL includes
#include <cstring>
#include <cstdio>
#include <iostream>
#include <cerrno>
// Linux includes
#include <fcntl.h>
#include <sys/ioctl.h>
// Local Hyperion includes
#include "LedSpiDevice.h"
#include <utils/Logger.h>
LedSpiDevice::LedSpiDevice(const std::string& outputDevice, const unsigned baudrate, const int latchTime_ns, const int spiMode, const bool spiDataInvert)
: _deviceName(outputDevice)
, _baudRate_Hz(baudrate)
, _latchTime_ns(latchTime_ns)
, _fid(-1)
, _spiMode(spiMode)
, _spiDataInvert(spiDataInvert)
{
memset(&_spi, 0, sizeof(_spi));
Debug(_log, "_spiDataInvert %d, _spiMode %d", _spiDataInvert, _spiMode);
}
LedSpiDevice::~LedSpiDevice()
{
// close(_fid);
}
int LedSpiDevice::open()
{
const int bitsPerWord = 8;
_fid = ::open(_deviceName.c_str(), O_RDWR);
if (_fid < 0)
{
Error( _log, "Failed to open device (%s). Error message: %s", _deviceName.c_str(), strerror(errno) );
return -1;
}
if (ioctl(_fid, SPI_IOC_WR_MODE, &_spiMode) == -1 || ioctl(_fid, SPI_IOC_RD_MODE, &_spiMode) == -1)
{
return -2;
}
if (ioctl(_fid, SPI_IOC_WR_BITS_PER_WORD, &bitsPerWord) == -1 || ioctl(_fid, SPI_IOC_RD_BITS_PER_WORD, &bitsPerWord) == -1)
{
return -4;
}
if (ioctl(_fid, SPI_IOC_WR_MAX_SPEED_HZ, &_baudRate_Hz) == -1 || ioctl(_fid, SPI_IOC_RD_MAX_SPEED_HZ, &_baudRate_Hz) == -1)
{
return -6;
}
return 0;
}
int LedSpiDevice::writeBytes(const unsigned size, const uint8_t * data)
{
if (_fid < 0)
{
return -1;
}
_spi.tx_buf = __u64(data);
_spi.len = __u32(size);
if (_spiDataInvert)
{
uint8_t * newdata = (uint8_t *)malloc(size);
for (unsigned i = 0; i<size; i++) {
newdata[i] = data[i] ^ 0xff;
}
_spi.tx_buf = __u64(newdata);
}
int retVal = ioctl(_fid, SPI_IOC_MESSAGE(1), &_spi);
if (retVal == 0 && _latchTime_ns > 0)
{
// The 'latch' time for latching the shifted-value into the leds
timespec latchTime;
latchTime.tv_sec = 0;
latchTime.tv_nsec = _latchTime_ns;
// Sleep to latch the leds (only if write succesfull)
nanosleep(&latchTime, NULL);
}
return retVal;
}