hyperion.ng/libsrc/leddevice/LedDeviceWS281x.cpp

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#include <iostream>
#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)
{
initialized = false;
led_string.freq = freq;
led_string.dmanum = dmanum;
if (pwmchannel != 0 && pwmchannel != 1) {
std::cout << "WS281x: invalid PWM channel; must be 0 or 1." << std::endl;
throw -1;
}
chan = pwmchannel;
led_string.channel[chan].gpionum = gpio;
led_string.channel[chan].invert = invert;
led_string.channel[chan].count = leds;
led_string.channel[chan].brightness = 255;
led_string.channel[chan].strip_type = WS2811_STRIP_RGB;
led_string.channel[!chan].gpionum = 0;
led_string.channel[!chan].invert = invert;
led_string.channel[!chan].count = 0;
led_string.channel[!chan].brightness = 0;
led_string.channel[!chan].strip_type = WS2811_STRIP_RGB;
if (ws2811_init(&led_string) < 0) {
std::cout << "Unable to initialize ws281x library." << std::endl;
throw -1;
}
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[chan].count)
break;
led_string.channel[chan].leds[idx++] = ((uint32_t)color.red << 16) + ((uint32_t)color.green << 8) + color.blue;
}
while (idx < led_string.channel[chan].count)
led_string.channel[chan].leds[idx++] = 0;
if (ws2811_render(&led_string))
return -1;
return 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[chan].count)
led_string.channel[chan].leds[idx++] = 0;
if (ws2811_render(&led_string))
return -1;
return 0;
}
// Destructor
LedDeviceWS281x::~LedDeviceWS281x()
{
if (initialized)
{
std::cout << "Shutdown WS281x PWM and DMA channel" << std::endl;
ws2811_fini(&led_string);
}
initialized = false;
}