hyperion.ng/libsrc/leddevice/LedDeviceLpd8806.cpp

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#include "LedDeviceLpd8806.h"
LedDeviceLpd8806::LedDeviceLpd8806(const Json::Value &deviceConfig)
: ProviderSpi()
{
_deviceReady = init(deviceConfig);
}
LedDevice* LedDeviceLpd8806::construct(const Json::Value &deviceConfig)
{
return new LedDeviceLpd8806(deviceConfig);
}
bool LedDeviceLpd8806::init(const Json::Value &deviceConfig)
{
ProviderSpi::init(deviceConfig);
const unsigned clearSize = _ledCount/32+1;
unsigned messageLength = _ledRGBCount + clearSize;
// Initialise the buffer
_ledBuffer.resize(messageLength, 0x00);
// Perform an initial reset to start accepting data on the first led
return writeBytes(clearSize, _ledBuffer.data()) >= 0;
}
int LedDeviceLpd8806::write(const std::vector<ColorRgb> &ledValues)
{
// Copy the colors from the ColorRgb vector to the Ldp8806 data vector
for (unsigned iLed=0; iLed<(unsigned)_ledCount; ++iLed)
{
const ColorRgb& color = ledValues[iLed];
_ledBuffer[iLed*3] = 0x80 | (color.red >> 1);
_ledBuffer[iLed*3+1] = 0x80 | (color.green >> 1);
_ledBuffer[iLed*3+2] = 0x80 | (color.blue >> 1);
}
// Write the data
return (writeBytes(_ledBuffer.size(), _ledBuffer.data()) < 0) ? -1 : 0;
}