Pu sh Кнопка для запуска и остановки программы с помощью python - PullRequest
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Pu sh Кнопка для запуска и остановки программы с помощью python

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/ 28 апреля 2020

У меня есть простая полоса неопикселя, работающая над Raspberry pi, и я запускаю ее со следующим кодом. Теперь я хотел бы добавить физическую мгновенную кнопку pu sh, чтобы запустить код и завершить процесс. Кто-нибудь может мне помочь с моей проблемой. вот код на данный момент я просто использую кнопку для запуска светодиодов, но для остановки я использую Ctrl c, для чего мне нужна клавиатура. Спасибо. 

 # Example of low-level Python wrapper for rpi_ws281x library.
# Author: Tony DiCola (tony@tonydicola.com), Jeremy Garff (jer@jers.net)
#
# This is an example of how to use the SWIG-generated _rpi_ws281x module.
# You probably don't want to use this unless you are building your own library,
# because the SWIG generated module is clunky and verbose.  Instead look at the
# high level Python port of Adafruit's NeoPixel Arduino library in strandtest.py.
#
# This code will animate a number of WS281x LEDs displaying rainbow colors.
import time

import _rpi_ws281x as ws

# LED configuration.
LED_CHANNEL    = 0
LED_COUNT      = 16         # How many LEDs to light.
LED_FREQ_HZ    = 800000     # Frequency of the LED signal.  Should be 800khz or 400khz.
LED_DMA_NUM    = 10         # DMA channel to use, can be 0-14.
LED_GPIO       = 18         # GPIO connected to the LED signal line.  Must support PWM!
LED_BRIGHTNESS = 255        # Set to 0 for darkest and 255 for brightest
LED_INVERT     = 0          # Set to 1 to invert the LED signal, good if using NPN
                            # transistor as a 3.3V->5V level converter.  Keep at 0
                            # for a normal/non-inverted signal.

# Define colors which will be used by the example.  Each color is an unsigned
# 32-bit value where the lower 24 bits define the red, green, blue data (each
# being 8 bits long).
DOT_COLORS = [  0x200000,   # red
                0x201000,   # orange
                0x202000,   # yellow
                0x002000,   # green
                0x002020,   # lightblue
                0x000020,   # blue
                0x100010,   # purple
                0x200010 ]  # pink


# 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.
leds = ws.new_ws2811_t()

# Initialize all channels to off
for channum in range(2):
    channel = ws.ws2811_channel_get(leds, 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(leds, LED_CHANNEL)

ws.ws2811_channel_t_count_set(channel, LED_COUNT)
ws.ws2811_channel_t_gpionum_set(channel, LED_GPIO)
ws.ws2811_channel_t_invert_set(channel, LED_INVERT)
ws.ws2811_channel_t_brightness_set(channel, LED_BRIGHTNESS)

ws.ws2811_t_freq_set(leds, LED_FREQ_HZ)
ws.ws2811_t_dmanum_set(leds, LED_DMA_NUM)

# Initialize library with LED configuration.
resp = ws.ws2811_init(leds)
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))

# Wrap following code in a try/finally to ensure cleanup functions are called
# after library is initialized.
try:
    offset = 0
    while True:
        # Update each LED color in the buffer.
        for i in range(LED_COUNT):
            # Pick a color based on LED position and an offset for animation.
            color = DOT_COLORS[(i + offset) % len(DOT_COLORS)]

            # Set the LED color buffer value.
            ws.ws2811_led_set(channel, i, color)

        # Send the LED color data to the hardware.
        resp = ws.ws2811_render(leds)
        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))

        # Delay for a small period of time.
        time.sleep(0.25)

        # Increase offset to animate colors moving.  Will eventually overflow, which
        # is fine.
        offset += 1

finally:
    # Ensure ws2811_fini is called before the program quits.
    ws.ws2811_fini(leds)
    # Example of calling delete functio`enter code here`n 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(leds)
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