hyperion.ng/libsrc/leddevice/LedSpiDevice.cpp

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// STL includes
#include <cstring>
#include <cstdio>
#include <iostream>
// Linux includes
#include <fcntl.h>
#include <sys/ioctl.h>
// Local Hyperion includes
#include "LedSpiDevice.h"
LedSpiDevice::LedSpiDevice(const std::string& outputDevice, const unsigned baudrate, const int latchTime_ns) :
mDeviceName(outputDevice),
mBaudRate_Hz(baudrate),
mLatchTime_ns(latchTime_ns),
mFid(-1)
{
memset(&spi, 0, sizeof(spi));
}
LedSpiDevice::~LedSpiDevice()
{
// close(mFid);
}
int LedSpiDevice::open()
{
const int bitsPerWord = 8;
mFid = ::open(mDeviceName.c_str(), O_RDWR);
if (mFid < 0)
{
std::cerr << "Failed to open device('" << mDeviceName << "') " << std::endl;
return -1;
}
int mode = SPI_MODE_0;
if (ioctl(mFid, SPI_IOC_WR_MODE, &mode) == -1 || ioctl(mFid, SPI_IOC_RD_MODE, &mode) == -1)
{
return -2;
}
if (ioctl(mFid, SPI_IOC_WR_BITS_PER_WORD, &bitsPerWord) == -1 || ioctl(mFid, SPI_IOC_RD_BITS_PER_WORD, &bitsPerWord) == -1)
{
return -4;
}
if (ioctl(mFid, SPI_IOC_WR_MAX_SPEED_HZ, &mBaudRate_Hz) == -1 || ioctl(mFid, SPI_IOC_RD_MAX_SPEED_HZ, &mBaudRate_Hz) == -1)
{
return -6;
}
return 0;
}
int LedSpiDevice::writeBytes(const unsigned size, const uint8_t * data)
{
if (mFid < 0)
{
return -1;
}
spi.tx_buf = __u64(data);
spi.len = __u32(size);
int retVal = ioctl(mFid, SPI_IOC_MESSAGE(1), &spi);
if (retVal == 0 && mLatchTime_ns > 0)
{
// The 'latch' time for latching the shifted-value into the leds
timespec latchTime;
latchTime.tv_sec = 0;
latchTime.tv_nsec = mLatchTime_ns;
// Sleep to latch the leds (only if write succesfull)
nanosleep(&latchTime, NULL);
}
return retVal;
}