hyperion.ng/libsrc/leddevice/LedDeviceWS281x.cpp

101 lines
2.7 KiB
C++

#include <iostream>
#include <exception>
#include "LedDeviceWS281x.h"
// Constructor
LedDeviceWS281x::LedDeviceWS281x(const int gpio, const int leds, const uint32_t freq, const int dmanum, const int pwmchannel, const int invert, const int rgbw, const std::string& whiteAlgorithm)
: LedDevice()
, _channel(pwmchannel)
, _initialized(false)
, _whiteAlgorithm(whiteAlgorithm)
{
Debug( _log, "whiteAlgorithm : %s", whiteAlgorithm.c_str());
_led_string.freq = freq;
_led_string.dmanum = dmanum;
if (pwmchannel != 0 && pwmchannel != 1)
{
throw std::runtime_error("WS281x: invalid PWM channel; must be 0 or 1.");
}
_led_string.channel[_channel].gpionum = gpio;
_led_string.channel[_channel].invert = invert;
_led_string.channel[_channel].count = leds;
_led_string.channel[_channel].brightness = 255;
_led_string.channel[_channel].strip_type = ((rgbw == 1) ? SK6812_STRIP_GRBW : WS2811_STRIP_RGB);
_led_string.channel[!_channel].gpionum = 0;
_led_string.channel[!_channel].invert = invert;
_led_string.channel[!_channel].count = 0;
_led_string.channel[!_channel].brightness = 0;
_led_string.channel[!_channel].strip_type = WS2811_STRIP_RGB;
if (ws2811_init(&_led_string) < 0)
{
throw std::runtime_error("Unable to initialize ws281x library.");
}
_initialized = true;
}
// 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;
}