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https://github.com/hyperion-project/hyperion.ng.git
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78e606a1c4
Add a new WS281x driver which is a wrapper around jgarff's ws281x library which works on Pi B+, Pi 2, Pi Zero and probably Pi 3 as well. jgarff's ws281x library is included as a submodule Former-commit-id: e473dfd36d31b14598da5e56e4b8bf9f2aa7bb24
79 lines
1.9 KiB
C++
79 lines
1.9 KiB
C++
#include <iostream>
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#include "LedDeviceWS281x.h"
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// Constructor
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LedDeviceWS281x::LedDeviceWS281x(const int gpio, const int leds, const uint32_t freq, const int dmanum)
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{
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initialized = false;
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led_string.freq = freq;
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led_string.dmanum = dmanum;
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led_string.channel[0].gpionum = gpio;
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led_string.channel[0].invert = 0;
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led_string.channel[0].count = leds;
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led_string.channel[0].brightness = 255;
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led_string.channel[0].strip_type = WS2811_STRIP_RGB;
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led_string.channel[1].gpionum = 0;
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led_string.channel[1].invert = 0;
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led_string.channel[1].count = 0;
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led_string.channel[1].brightness = 0;
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led_string.channel[0].strip_type = WS2811_STRIP_RGB;
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if (ws2811_init(&led_string) < 0) {
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std::cout << "Unable to initialize ws281x library." << std::endl;
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throw -1;
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}
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initialized = true;
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}
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// Send new values down the LED chain
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int LedDeviceWS281x::write(const std::vector<ColorRgb> &ledValues)
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{
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if (!initialized)
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return -1;
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int idx = 0;
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for (const ColorRgb& color : ledValues)
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{
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if (idx >= led_string.channel[0].count)
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break;
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led_string.channel[0].leds[idx++] = ((uint32_t)color.red << 16) + ((uint32_t)color.green << 8) + color.blue;
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}
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while (idx < led_string.channel[0].count)
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led_string.channel[0].leds[idx++] = 0;
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if (ws2811_render(&led_string))
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return -1;
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return 0;
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}
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// Turn off the LEDs by sending 000000's
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// TODO Allow optional power switch out another gpio, if this code handles it can
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// make it more likely we don't accidentally drive data into an off strip
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int LedDeviceWS281x::switchOff()
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{
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if (!initialized)
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return -1;
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int idx = 0;
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while (idx < led_string.channel[0].count)
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led_string.channel[0].leds[idx++] = 0;
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if (ws2811_render(&led_string))
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return -1;
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return 0;
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}
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// Destructor
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LedDeviceWS281x::~LedDeviceWS281x()
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{
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if (initialized)
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{
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std::cout << "Shutdown WS281x PWM and DMA channel" << std::endl;
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ws2811_fini(&led_string);
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}
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initialized = false;
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}
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