def __init__(self, leds=[32, 8], pin=18, channel=0, freq_hz=800000, dma=5, invert=False, brightness=255, type_=ws.WS2811_STRIP_GRB): self._leds = ws.new_ws2811_t() for cn in range(2): c = ws.ws2811_channel_get(self._leds, cn) ws.ws2811_channel_t_count_set(c, 0) ws.ws2811_channel_t_gpionum_set(c, 0) ws.ws2811_channel_t_invert_set(c, 0) ws.ws2811_channel_t_brightness_set(c, 0) self._ch = ws.ws2811_channel_get(self._leds, channel) ws.ws2811_channel_t_count_set(self._ch, leds[0] * leds[1]) ws.ws2811_channel_t_gpionum_set(self._ch, pin) ws.ws2811_channel_t_invert_set(self._ch, (0 if invert == False else 1)) ws.ws2811_channel_t_brightness_set(self._ch, brightness) ws.ws2811_channel_t_strip_type_set(self._ch, type_) ws.ws2811_t_freq_set(self._leds, freq_hz) ws.ws2811_t_dmanum_set(self._leds, dma) self.data = LED_Data(self._ch, leds) atexit.register(self._c) r = ws.ws2811_init(self._leds) if (r != ws.WS2811_SUCCESS): raise RuntimeError(ws.ws2811_get_return_t_str(r))
def __init__(self, num, pin, freq_hz=800000, dma=10, invert=False, brightness=255, channel=0, strip_type=ws.WS2811_STRIP_RGB): """Class to represent a NeoPixel/WS281x LED display. Num should be the number of pixels in the display, and pin should be the GPIO pin connected to the display signal line (must be a PWM pin like 18!). Optional parameters are freq, the frequency of the display signal in hertz (default 800khz), dma, the DMA channel to use (default 10), invert, a boolean specifying if the signal line should be inverted (default False), and channel, the PWM channel to use (defaults to 0). """ # Create ws2811_t structure and fill in parameters. self._leds = ws.new_ws2811_t() # Initialize the channels to zero for channum in range(2): chan = ws.ws2811_channel_get(self._leds, channum) ws.ws2811_channel_t_count_set(chan, 0) ws.ws2811_channel_t_gpionum_set(chan, 0) ws.ws2811_channel_t_invert_set(chan, 0) ws.ws2811_channel_t_brightness_set(chan, 0) # Initialize the channel in use self._channel = ws.ws2811_channel_get(self._leds, channel) ws.ws2811_channel_t_count_set(self._channel, num) ws.ws2811_channel_t_gpionum_set(self._channel, pin) ws.ws2811_channel_t_invert_set(self._channel, 0 if not invert else 1) ws.ws2811_channel_t_brightness_set(self._channel, brightness) ws.ws2811_channel_t_strip_type_set(self._channel, strip_type) # Initialize the controller ws.ws2811_t_freq_set(self._leds, freq_hz) ws.ws2811_t_dmanum_set(self._leds, dma) # Grab the led data array. self._led_data = _LED_Data(self._channel, num) # Substitute for __del__, traps an exit condition and cleans up properly atexit.register(self._cleanup)
def brightness(self, b): ws.ws2811_channel_t_brightness_set(self._ch, b)
def set_brightness(self, brightness): """Scale each LED in the buffer by the provided brightness. A brightness of 0 is the darkest and 255 is the brightest. """ ws.ws2811_channel_t_brightness_set(self._channel, brightness)