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72 lines
2.1 KiB
C++
72 lines
2.1 KiB
C++
#include "LedDeviceAPA102.h"
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// Constants
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namespace {
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/// The value that determines the higher bits of the APA102 brightness control field
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const int APA102_LEDFRAME_UPPER_BITS = 0xE0;
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} //End of constants
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LedDeviceAPA102::LedDeviceAPA102(const QJsonObject &deviceConfig)
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: ProviderSpi(deviceConfig)
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{
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// Overwrite non supported/required features
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_latchTime_ms = 0;
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}
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LedDevice* LedDeviceAPA102::construct(const QJsonObject &deviceConfig)
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{
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return new LedDeviceAPA102(deviceConfig);
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}
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bool LedDeviceAPA102::init(const QJsonObject &deviceConfig)
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{
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bool isInitOK = false;
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// Initialise sub-class
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if ( ProviderSpi::init(deviceConfig) )
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{
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_brightnessControlMaxLevel = deviceConfig["brightnessControlMaxLevel"].toInt(APA102_BRIGHTNESS_MAX_LEVEL);
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Info(_log, "[%s] Setting maximum brightness to [%d] = %d%%", QSTRING_CSTR(_activeDeviceType), _brightnessControlMaxLevel, _brightnessControlMaxLevel * 100 / APA102_BRIGHTNESS_MAX_LEVEL);
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const unsigned int startFrameSize = 4;
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//Endframe, add additional 4 bytes to cover SK9922 Reset frame (in case SK9922 were sold as AP102) - has no effect on APA102
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const unsigned int endFrameSize = (_ledCount/32) * 4 + 4;
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const unsigned int APAbufferSize = (_ledCount * 4) + startFrameSize + endFrameSize;
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_ledBuffer.resize(APAbufferSize, 0x00);
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isInitOK = true;
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}
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return isInitOK;
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}
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void LedDeviceAPA102::bufferWithBrightness(std::vector<uint8_t> &txBuf, const std::vector<ColorRgb> & ledValues, const int brightness) {
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const int ledCount = static_cast<int>(_ledCount);
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for (int iLed = 0; iLed < ledCount; ++iLed)
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{
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const ColorRgb &rgb = ledValues[iLed];
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const uint8_t red = rgb.red;
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const uint8_t green = rgb.green;
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const uint8_t blue = rgb.blue;
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/// The LED index in the buffer
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const int b = 4 + iLed * 4;
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txBuf[b + 0] = brightness | APA102_LEDFRAME_UPPER_BITS;
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txBuf[b + 1] = blue;
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txBuf[b + 2] = green;
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txBuf[b + 3] = red;
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}
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}
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int LedDeviceAPA102::write(const std::vector<ColorRgb> &ledValues)
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{
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this->bufferWithBrightness(_ledBuffer, ledValues, _brightnessControlMaxLevel);
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return writeBytes(_ledBuffer.size(), _ledBuffer.data());
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}
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