hyperion.ng/libsrc/leddevice/LedDeviceWS281x.cpp

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#include <iostream>
#include <exception>
#include "LedDeviceWS281x.h"
// Constructor
LedDeviceWS281x::LedDeviceWS281x(const Json::Value &deviceConfig)
: LedDevice()
, _initialized(false)
{
setConfig(deviceConfig);
Debug( _log, "whiteAlgorithm : %s", _whiteAlgorithm.c_str());
if (ws2811_init(&_led_string) < 0)
{
throw std::runtime_error("Unable to initialize ws281x library.");
}
_initialized = true;
}
bool LedDeviceWS281x::setConfig(const Json::Value &deviceConfig)
{
_whiteAlgorithm = deviceConfig.get("white_algorithm","").asString();
_channel = deviceConfig.get("pwmchannel", 0).asInt();
if (_channel != 0 && _channel != 1)
{
throw std::runtime_error("WS281x: invalid PWM channel; must be 0 or 1.");
}
_led_string.freq = deviceConfig.get("freq", (Json::UInt)800000ul).asInt();
_led_string.dmanum = deviceConfig.get("dmanum", 5).asInt();
_led_string.channel[_channel].gpionum = deviceConfig.get("gpio", 18).asInt();
_led_string.channel[_channel].count = deviceConfig.get("leds", 256).asInt();
_led_string.channel[_channel].invert = deviceConfig.get("invert", 0).asInt();
_led_string.channel[_channel].strip_type = ((deviceConfig.get("rgbw", 0).asInt() == 1) ? SK6812_STRIP_GRBW : WS2811_STRIP_RGB);
_led_string.channel[_channel].brightness = 255;
_led_string.channel[!_channel].gpionum = 0;
_led_string.channel[!_channel].invert = _led_string.channel[_channel].invert;
_led_string.channel[!_channel].count = 0;
_led_string.channel[!_channel].brightness = 0;
_led_string.channel[!_channel].strip_type = WS2811_STRIP_RGB;
return true;
}
LedDevice* LedDeviceWS281x::construct(const Json::Value &deviceConfig)
{
return new LedDeviceWS281x(deviceConfig);
}
// Send new values down the LED chain
int LedDeviceWS281x::write(const std::vector<ColorRgb> &ledValues)
{
if (!_initialized)
return -1;
int idx = 0;
for (const ColorRgb& color : ledValues)
{
if (idx >= _led_string.channel[_channel].count)
{
break;
}
_temp_rgbw.red = color.red;
_temp_rgbw.green = color.green;
_temp_rgbw.blue = color.blue;
_temp_rgbw.white = 0;
if (_led_string.channel[_channel].strip_type == SK6812_STRIP_GRBW)
{
Rgb_to_Rgbw(color, &_temp_rgbw, _whiteAlgorithm);
}
_led_string.channel[_channel].leds[idx++] =
((uint32_t)_temp_rgbw.white << 24) + ((uint32_t)_temp_rgbw.red << 16) + ((uint32_t)_temp_rgbw.green << 8) + _temp_rgbw.blue;
}
while (idx < _led_string.channel[_channel].count)
{
_led_string.channel[_channel].leds[idx++] = 0;
}
return ws2811_render(&_led_string) ? -1 : 0;
}
// Turn off the LEDs by sending 000000's
// TODO Allow optional power switch out another gpio, if this code handles it can
// make it more likely we don't accidentally drive data into an off strip
int LedDeviceWS281x::switchOff()
{
if (!_initialized)
{
return -1;
}
int idx = 0;
while (idx < _led_string.channel[_channel].count)
_led_string.channel[_channel].leds[idx++] = 0;
return ws2811_render(&_led_string) ? -1 : 0;
}
// Destructor
LedDeviceWS281x::~LedDeviceWS281x()
{
if (_initialized)
{
ws2811_fini(&_led_string);
}
_initialized = false;
}