91 lines
2.2 KiB
C++
91 lines
2.2 KiB
C++
#include "LedDeviceFadeCandy.h"
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static const signed MAX_NUM_LEDS = 10000; // OPC can handle 21845 leds - in theory, fadecandy device should handle 10000 leds
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static const unsigned OPC_SET_PIXELS = 0; // OPC command codes
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static const unsigned OPC_HEADER_SIZE = 4; // OPC header size
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LedDeviceFadeCandy::LedDeviceFadeCandy(const std::string& host, const uint16_t port, const unsigned channel) :
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_host(host), _port(port), _channel(channel)
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{
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_opc_data.resize( OPC_HEADER_SIZE );
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_opc_data[0] = channel;
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_opc_data[1] = OPC_SET_PIXELS;
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_opc_data[2] = 0;
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_opc_data[3] = 0;
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}
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LedDeviceFadeCandy::~LedDeviceFadeCandy()
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{
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_client.close();
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}
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bool LedDeviceFadeCandy::isConnected()
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{
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return _client.state() == QAbstractSocket::ConnectedState;
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}
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bool LedDeviceFadeCandy::tryConnect()
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{
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if ( _client.state() == QAbstractSocket::UnconnectedState ) {
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_client.connectToHost( _host.c_str(), _port);
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if ( _client.waitForConnected(1000) )
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Info(_log,"fadecandy/opc: connected to %s:%i on channel %i", _host.c_str(), _port, _channel);
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}
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return isConnected();
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}
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int LedDeviceFadeCandy::write( const std::vector<ColorRgb> & ledValues )
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{
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ssize_t nrLedValues = ledValues.size();
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ssize_t led_data_size = nrLedValues * 3; // 3 color bytes
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ssize_t opc_data_size = led_data_size + OPC_HEADER_SIZE;
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if (nrLedValues > MAX_NUM_LEDS)
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{
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Error(_log, "fadecandy/opc: Invalid attempt to write led values. Not more than %d leds are allowed.", MAX_NUM_LEDS);
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return -1;
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}
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if ( opc_data_size != _opc_data.size() )
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_opc_data.resize( opc_data_size );
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_opc_data[2] = led_data_size >> 8;
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_opc_data[3] = led_data_size & 0xff;
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uint idx = OPC_HEADER_SIZE;
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for (const ColorRgb& color : ledValues)
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{
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_opc_data[idx ] = unsigned( color.red );
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_opc_data[idx+1] = unsigned( color.green );
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_opc_data[idx+2] = unsigned( color.blue );
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idx += 3;
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}
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return ( transferData()<0 ? -1 : 0 );
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}
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int LedDeviceFadeCandy::transferData()
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{
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if ( isConnected() || tryConnect() )
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return _client.write( _opc_data, _opc_data.size() );
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return -2;
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}
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int LedDeviceFadeCandy::switchOff()
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{
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for ( int idx=OPC_HEADER_SIZE; idx < _opc_data.size(); idx++ )
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_opc_data[idx] = 0;
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return ( transferData()<0 ? -1 : 0 );
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}
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