+++ /dev/null
-import time
-import math
-import _rpi_ws281x as ws
-import atexit
-
-# LED configuration.
-LED_CHANNEL = 0
-LED_FREQ_HZ = 800000 # Frequency of the LED signal. We only support 800KHz
-LED_DMA_NUM = 10 # DMA channel to use, can be 0-14.
-LED_BRIGHTNESS = 255 # We manage the brightness in the neopixel library
-LED_INVERT = 0 # We don't support inverted logic
-LED_STRIP = ws.WS2811_STRIP_RGB # We manage the color order within the neopixel library
-
-# a 'static' object that we will use to manage our PWM DMA channel
-# we only support one LED strip per raspi
-_led_strip = None
-
-def neopixel_write(gpio, buf):
- global _led_strip # we'll have one strip we init if its not at first
-
- if _led_strip is None:
- # Create a ws2811_t structure from the LED configuration.
- # Note that this structure will be created on the heap so you
- # need to be careful that you delete its memory by calling
- # delete_ws2811_t when it's not needed.
- _led_strip = ws.new_ws2811_t()
-
- # Initialize all channels to off
- for channum in range(2):
- channel = ws.ws2811_channel_get(_led_strip, channum)
- ws.ws2811_channel_t_count_set(channel, 0)
- ws.ws2811_channel_t_gpionum_set(channel, 0)
- ws.ws2811_channel_t_invert_set(channel, 0)
- ws.ws2811_channel_t_brightness_set(channel, 0)
-
- channel = ws.ws2811_channel_get(_led_strip, LED_CHANNEL)
-
- # Initialize the channel in use
- ws.ws2811_channel_t_count_set(channel, math.ceil(len(buf)/3)) # we manage 4 vs 3 bytes in the library
- ws.ws2811_channel_t_gpionum_set(channel, gpio._pin.id)
- ws.ws2811_channel_t_invert_set(channel, LED_INVERT)
- ws.ws2811_channel_t_brightness_set(channel, LED_BRIGHTNESS)
- ws.ws2811_channel_t_strip_type_set(channel, LED_STRIP)
-
- # Initialize the controller
- ws.ws2811_t_freq_set(_led_strip, LED_FREQ_HZ)
- ws.ws2811_t_dmanum_set(_led_strip, LED_DMA_NUM)
-
- resp = ws.ws2811_init(_led_strip)
- if resp != ws.WS2811_SUCCESS:
- message = ws.ws2811_get_return_t_str(resp)
- raise RuntimeError('ws2811_init failed with code {0} ({1})'.format(resp, message))
- atexit.register(neopixel_cleanup)
-
- channel = ws.ws2811_channel_get(_led_strip, LED_CHANNEL)
- if gpio._pin.id != ws.ws2811_channel_t_gpionum_get(channel):
- raise RuntimeError("Raspberry Pi neopixel support is for one strip only!")
-
- # assign all colors!
- # bad way
- pixels = zip(*[iter(buf)]*3)
- for i, pixel in enumerate(pixels):
- #print(pixel)
- ws.ws2811_led_set(channel, i, pixel[0]<<16 | pixel[1] << 8 | pixel[2])
-
- resp = ws.ws2811_render(_led_strip)
- if resp != ws.WS2811_SUCCESS:
- message = ws.ws2811_get_return_t_str(resp)
- raise RuntimeError('ws2811_render failed with code {0} ({1})'.format(resp, message))
- time.sleep(0.001 * ((len(buf)//100)+1)) # about 1ms per 100 bytes
-
-
-def neopixel_cleanup():
- global _led_strip
-
- if _led_strip is not None:
- # Ensure ws2811_fini is called before the program quits.
- ws.ws2811_fini(_led_strip)
- # Example of calling delete function to clean up structure memory. Isn't
- # strictly necessary at the end of the program execution here, but is good practice.
- ws.delete_ws2811_t(_led_strip)
- _led_strip = None