hyperion.ng/libsrc/leddevice/LedDeviceLpd6803.cpp

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#include "LedDeviceLpd6803.h"
LedDeviceLpd6803::LedDeviceLpd6803(const Json::Value &deviceConfig)
: ProviderSpi()
{
_deviceReady = init(deviceConfig);
}
LedDevice* LedDeviceLpd6803::construct(const Json::Value &deviceConfig)
{
return new LedDeviceLpd6803(deviceConfig);
}
bool LedDeviceLpd6803::init(const Json::Value &deviceConfig)
{
ProviderSpi::init(deviceConfig);
unsigned messageLength = 4 + 2*_ledCount + _ledCount/8 + 1;
// Initialise the buffer
_ledBuffer.resize(messageLength, 0x00);
return true;
}
int LedDeviceLpd6803::write(const std::vector<ColorRgb> &ledValues)
{
// Copy the colors from the ColorRgb vector to the Ldp6803 data vector
for (unsigned iLed=0; iLed<(unsigned)_ledCount; ++iLed)
{
const ColorRgb& color = ledValues[iLed];
_ledBuffer[4 + 2 * iLed] = 0x80 | ((color.red & 0xf8) >> 1) | (color.green >> 6);
_ledBuffer[5 + 2 * iLed] = ((color.green & 0x38) << 2) | (color.blue >> 3);
}
// Write the data
return (writeBytes(_ledBuffer.size(), _ledBuffer.data()) < 0) ? -1 : 0;
}