hyperion.ng/libsrc/leddevice/LedDeviceTpm2.cpp

// STL includes
#include <cstring>
#include <cstdio>
#include <iostream>

// Linux includes
#include <fcntl.h>
#include <sys/ioctl.h>

// hyperion local includes
#include "LedDeviceTpm2.h"

LedDeviceTpm2::LedDeviceTpm2(const std::string& outputDevice, const unsigned baudrate) :
	LedRs232Device(outputDevice, baudrate),
	_ledBuffer(0)
{
	// empty
}

int LedDeviceTpm2::write(const std::vector<ColorRgb> &ledValues)
{
  	if (_ledBuffer.size() == 0)
  	{
    		_ledBuffer.resize(5 + 3*ledValues.size());
    		_ledBuffer[0] = 0xC9; // block-start byte
    		_ledBuffer[1] = 0xDA; // DATA frame
    		_ledBuffer[2] = ((3 * ledValues.size()) >> 8) & 0xFF; // frame size high byte
    		_ledBuffer[3] = (3 * ledValues.size()) & 0xFF; // frame size low byte
    		_ledBuffer.back() = 0x36; // block-end byte
  	}

  	// write data
  	memcpy(4 + _ledBuffer.data(), ledValues.data(), ledValues.size() * 3);
	return writeBytes(_ledBuffer.size(), _ledBuffer.data());
}

int LedDeviceTpm2::switchOff()
{
	memset(4 + _ledBuffer.data(), 0, _ledBuffer.size() - 5);
	return writeBytes(_ledBuffer.size(), _ledBuffer.data());
}