61 lines
1.5 KiB
C++
61 lines
1.5 KiB
C++
#include "LedDeviceWs2812SPI.h"
|
|
|
|
LedDeviceWs2812SPI::LedDeviceWs2812SPI(const QJsonObject &deviceConfig)
|
|
: ProviderSpi()
|
|
, SPI_BYTES_PER_COLOUR(4)
|
|
, bitpair_to_byte {
|
|
0b10001000,
|
|
0b10001100,
|
|
0b11001000,
|
|
0b11001100,
|
|
}
|
|
{
|
|
_deviceReady = init(deviceConfig);
|
|
}
|
|
|
|
LedDevice* LedDeviceWs2812SPI::construct(const QJsonObject &deviceConfig)
|
|
{
|
|
return new LedDeviceWs2812SPI(deviceConfig);
|
|
}
|
|
|
|
bool LedDeviceWs2812SPI::init(const QJsonObject &deviceConfig)
|
|
{
|
|
_baudRate_Hz = 3000000;
|
|
if ( !ProviderSpi::init(deviceConfig) )
|
|
{
|
|
return false;
|
|
}
|
|
WarningIf(( _baudRate_Hz < 2050000 || _baudRate_Hz > 4000000 ), _log, "SPI rate %d outside recommended range (2050000 -> 4000000)", _baudRate_Hz);
|
|
|
|
const int SPI_FRAME_END_LATCH_BYTES = 3;
|
|
_ledBuffer.resize(_ledRGBCount * SPI_BYTES_PER_COLOUR + SPI_FRAME_END_LATCH_BYTES, 0x00);
|
|
|
|
return true;
|
|
}
|
|
|
|
int LedDeviceWs2812SPI::write(const std::vector<ColorRgb> &ledValues)
|
|
{
|
|
unsigned spi_ptr = 0;
|
|
const int SPI_BYTES_PER_LED = sizeof(ColorRgb) * SPI_BYTES_PER_COLOUR;
|
|
|
|
for (const ColorRgb& color : ledValues)
|
|
{
|
|
uint32_t colorBits = ((unsigned int)color.red << 16)
|
|
| ((unsigned int)color.green << 8)
|
|
| color.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(_ledBuffer.size(), _ledBuffer.data());
|
|
}
|