hyperion.ng/libsrc/leddevice/LedDeviceWs2812SPI.cpp

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#include "LedDeviceWs2812SPI.h"
LedDeviceWs2812SPI::LedDeviceWs2812SPI(const Json::Value &deviceConfig)
: ProviderSpi()
, bitpair_to_byte {
0b10001000,
0b10001100,
0b11001000,
0b11001100,
}
{
setConfig(deviceConfig);
}
LedDevice* LedDeviceWs2812SPI::construct(const Json::Value &deviceConfig)
{
return new LedDeviceWs2812SPI(deviceConfig);
}
bool LedDeviceWs2812SPI::setConfig(const Json::Value &deviceConfig)
{
ProviderSpi::setConfig(deviceConfig,3000000);
WarningIf(( _baudRate_Hz < 2050000 || _baudRate_Hz > 4000000 ), _log, "SPI rate %d outside recommended range (2050000 -> 4000000)", _baudRate_Hz);
return true;
}
int LedDeviceWs2812SPI::write(const std::vector<ColorRgb> &ledValues)
{
// 3 colours, 4 spi bytes per colour + 3 frame end latch bytes
const int SPI_BYTES_PER_LED = 3 * 4;
unsigned spi_size = _ledCount * SPI_BYTES_PER_LED + 3;
if(_ledBuffer.size() != spi_size)
{
_ledBuffer.resize(spi_size, 0x00);
}
unsigned spi_ptr = 0;
for (unsigned i=0; i<(unsigned)_ledCount; ++i)
{
uint32_t colorBits = ((unsigned int)ledValues[i].red << 16)
| ((unsigned int)ledValues[i].green << 8)
| ledValues[i].blue;
for (int j=SPI_BYTES_PER_LED - 1; j>=0; j--)
{
_ledBuffer[spi_ptr+j] = bitpair_to_byte[ colorBits & 0x3 ];
colorBits >>= 2;
}
spi_ptr += SPI_BYTES_PER_LED;
}
_ledBuffer[spi_ptr++] = 0;
_ledBuffer[spi_ptr++] = 0;
_ledBuffer[spi_ptr++] = 0;
return writeBytes(spi_size, _ledBuffer.data());
}