hyperion.ng/libsrc/leddevice/LedDeviceAPA102.cpp

#include "LedDeviceAPA102.h"

LedDeviceAPA102::LedDeviceAPA102(const Json::Value &deviceConfig)
	: ProviderSpi()
{
	_deviceReady = init(deviceConfig);
}

LedDevice* LedDeviceAPA102::construct(const Json::Value &deviceConfig)
{
	return new LedDeviceAPA102(deviceConfig);
}

bool LedDeviceAPA102::init(const Json::Value &deviceConfig)
{
	ProviderSpi::init(deviceConfig);
	_latchTime_ns = 500000; // fixed latchtime

	const unsigned int startFrameSize = 4;
	const unsigned int endFrameSize = std::max<unsigned int>(((_ledCount + 15) / 16), 4);
	const unsigned int APAbufferSize = (_ledCount * 4) + startFrameSize + endFrameSize;

	_ledBuffer.resize(APAbufferSize, 0xFF);
	_ledBuffer[0] = 0x00; 
	_ledBuffer[1] = 0x00; 
	_ledBuffer[2] = 0x00; 
	_ledBuffer[3] = 0x00; 
	
	return true;
}

int LedDeviceAPA102::write(const std::vector<ColorRgb> &ledValues)
{
	for (signed iLed=0; iLed < _ledCount; ++iLed) {
		const ColorRgb& rgb = ledValues[iLed];
		_ledBuffer[4+iLed*4]   = 0xFF;
		_ledBuffer[4+iLed*4+1] = rgb.red;
		_ledBuffer[4+iLed*4+2] = rgb.green;
		_ledBuffer[4+iLed*4+3] = rgb.blue;
	}

	return writeBytes(_ledBuffer.size(), _ledBuffer.data());
}