hyperion.ng/libsrc/leddevice/ProviderSpi.cpp

115 lines
2.5 KiB
C++

// STL includes
#include <cstring>
#include <cstdio>
#include <iostream>
#include <cerrno>
// Linux includes
#include <fcntl.h>
#include <sys/ioctl.h>
// Local Hyperion includes
#include "ProviderSpi.h"
#include <utils/Logger.h>
ProviderSpi::ProviderSpi()
: LedDevice()
, _deviceName("/dev/spidev0.0")
, _baudRate_Hz(1000000)
, _latchTime_ns(0)
, _fid(-1)
, _spiMode(SPI_MODE_0)
, _spiDataInvert(false)
{
memset(&_spi, 0, sizeof(_spi));
}
ProviderSpi::~ProviderSpi()
{
// close(_fid);
}
bool ProviderSpi::init(const QJsonObject &deviceConfig)
{
LedDevice::init(deviceConfig);
_deviceName = deviceConfig["output"].toString(QString::fromStdString(_deviceName)).toStdString();
_baudRate_Hz = deviceConfig["rate"].toInt(_baudRate_Hz);
_latchTime_ns = deviceConfig["latchtime"].toInt(_latchTime_ns);
_spiMode = deviceConfig["spimode"].toInt(_spiMode);
_spiDataInvert = deviceConfig["invert"].toBool(_spiDataInvert);
return true;
}
int ProviderSpi::open()
{
Debug(_log, "_baudRate_Hz %d, _latchTime_ns %d", _baudRate_Hz, _latchTime_ns);
Debug(_log, "_spiDataInvert %d, _spiMode %d", _spiDataInvert, _spiMode);
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 ProviderSpi::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);
ErrorIf((retVal < 0), _log, "SPI failed to write. errno: %d, %s", errno, strerror(errno) );
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;
}