hyperion.ng/libsrc/hyperion/LedDeviceWs2801.cpp

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// STL includes
#include <cstring>
#include <cstdio>
#include <iostream>
// Linux includes
#include <fcntl.h>
#include <sys/ioctl.h>
// hyperion local includes
#include "LedDeviceWs2801.h"
2013-09-09 04:54:13 +02:00
LedDeviceWs2801::LedDeviceWs2801(const std::string& outputDevice,
const unsigned baudrate) :
mDeviceName(outputDevice),
mBaudRate_Hz(baudrate),
mFid(-1)
{
memset(&spi, 0, sizeof(spi));
latchTime.tv_sec = 0;
latchTime.tv_nsec = 500000;
}
LedDeviceWs2801::~LedDeviceWs2801()
{
// close(mFid);
}
int LedDeviceWs2801::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 LedDeviceWs2801::write(const std::vector<RgbColor> &ledValues)
{
if (mFid < 0)
{
std::cerr << "Can not write to device which is open." << std::endl;
return -1;
}
spi.tx_buf = (__u64)ledValues.data();
spi.len = ledValues.size() * sizeof(RgbColor);
int retVal = ioctl(mFid, SPI_IOC_MESSAGE(1), &spi);
if (retVal == 0)
{
// Sleep to latch the leds (only if write succesfull)
nanosleep(&latchTime, NULL);
}
return retVal;
}