hyperion.ng/libsrc/leddevice/LedDeviceFadeCandy.cpp

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#include "LedDeviceFadeCandy.h"
static const unsigned MAX_NUM_LEDS = 512;
static const unsigned OPC_BROADCAST = 0; // OPC broadcast channel
static const unsigned OPC_SET_PIXELS = 0; // OPC command codes
static const unsigned OPC_HEADER_SIZE = 4; // OPC header size
LedDeviceFadeCandy::LedDeviceFadeCandy(const std::string& host, const uint16_t port) :
_host(host), _port(port)
{
_opc_data.resize( OPC_HEADER_SIZE );
_opc_data[0] = OPC_BROADCAST;
_opc_data[1] = OPC_SET_PIXELS;
_opc_data[2] = 0;
_opc_data[3] = 0;
}
LedDeviceFadeCandy::~LedDeviceFadeCandy()
{
_client.close();
}
bool LedDeviceFadeCandy::isConnected()
{
return _client.state() == QAbstractSocket::ConnectedState;
}
bool LedDeviceFadeCandy::tryConnect()
{
if ( _client.state() == QAbstractSocket::UnconnectedState ) {
qDebug("connecting to %s %i",_host.c_str(),_port);
_client.connectToHost( _host.c_str(), _port);
if ( _client.waitForConnected(1000) )
qDebug("connected");
}
return isConnected();
}
int LedDeviceFadeCandy::write( const std::vector<ColorRgb> & ledValues )
{
ssize_t nrLedValues = ledValues.size();
ssize_t led_data_size = nrLedValues * 3; // 3 color bytes
ssize_t opc_data_size = led_data_size + OPC_HEADER_SIZE;
if (nrLedValues > MAX_NUM_LEDS)
{
std::cerr << "Invalid attempt to write led values. Not more than " << MAX_NUM_LEDS << " leds are allowed." << std::endl;
return -1;
}
if ( opc_data_size != _opc_data.size() )
_opc_data.resize( opc_data_size );
_opc_data[2] = led_data_size >> 8;
_opc_data[3] = led_data_size & 0xff;
uint idx = OPC_HEADER_SIZE;
for (const ColorRgb& color : ledValues)
{
_opc_data[idx ] = unsigned( color.red );
_opc_data[idx+1] = unsigned( color.green );
_opc_data[idx+2] = unsigned( color.blue );
idx += 3;
}
return ( transferData()<0 ? -1 : 0 );
}
int LedDeviceFadeCandy::transferData()
{
if ( isConnected() || tryConnect() )
return _client.write( _opc_data, _opc_data.size() );
return -2;
}
int LedDeviceFadeCandy::switchOff()
{
for ( int idx=OPC_HEADER_SIZE; idx < _opc_data.size(); idx++ )
_opc_data[idx] = 0;
return ( transferData()<0 ? -1 : 0 );
}