hyperion.ng/libsrc/leddevice/dev_net/LedDeviceTpm2net.cpp

#include "LedDeviceTpm2net.h"

LedDeviceTpm2net::LedDeviceTpm2net(const QJsonObject &deviceConfig)
	: ProviderUdp()
{
	_deviceReady = init(deviceConfig);
}

bool LedDeviceTpm2net::init(const QJsonObject &deviceConfig)
{
	_port = TPM2_DEFAULT_PORT;
	ProviderUdp::init(deviceConfig);
	_tpm2_max  = deviceConfig["max-packet"].toInt(170);
	_tpm2ByteCount = 3 * _ledCount;
	_tpm2TotalPackets = 1 + _tpm2ByteCount / _tpm2_max;

	return true;
}

LedDevice* LedDeviceTpm2net::construct(const QJsonObject &deviceConfig)
{
	return new LedDeviceTpm2net(deviceConfig);
}


// populates the headers

int LedDeviceTpm2net::write(const std::vector<ColorRgb> &ledValues)
{
	uint8_t * tpm2_buffer = (uint8_t*) malloc(_tpm2_max+7);

	int retVal = 0;

	int _thisPacketBytes = 0;
	_tpm2ThisPacket = 1;

	const uint8_t * rawdata = reinterpret_cast<const uint8_t *>(ledValues.data());

	for (int rawIdx = 0; rawIdx < _tpm2ByteCount; rawIdx++)
	{
		if (rawIdx % _tpm2_max == 0) // start of new packet
		{
			_thisPacketBytes = (_tpm2ByteCount - rawIdx < _tpm2_max) ? _tpm2ByteCount % _tpm2_max : _tpm2_max;
//			                        is this the last packet?         ?    ^^ last packet          : ^^ earlier packets

			tpm2_buffer[0] = 0x9c;	// Packet start byte
			tpm2_buffer[1] = 0xda; // Packet type Data frame
			tpm2_buffer[2] = (_thisPacketBytes >> 8) & 0xff; // Frame size high
			tpm2_buffer[3] = _thisPacketBytes & 0xff; // Frame size low
			tpm2_buffer[4] = _tpm2ThisPacket++; // Packet Number
			tpm2_buffer[5] = _tpm2TotalPackets; // Number of packets
		}

		tpm2_buffer [6 + rawIdx%_tpm2_max] = rawdata[rawIdx];

//     is this the      last byte of last packet    ||   last byte of other packets
		if ( (rawIdx == _tpm2ByteCount-1) || (rawIdx %_tpm2_max == _tpm2_max-1) )
		{
			tpm2_buffer [6 + rawIdx%_tpm2_max +1] = 0x36;		// Packet end byte
			retVal &= writeBytes(_thisPacketBytes+7, tpm2_buffer);
		}
	}

	return retVal;
}