hyperion.ng/libsrc/leddevice/LedDeviceLpd6803.cpp

#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;
}