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我是 Python 的新手，我正在做一个项目，我会让人们按下按钮来播放视频事件。Video#1 将是默认的普通视频，而 video#2 将播放并闪烁来自 GPIO 13 (BCM) 的 LED。

这是我的困境：按钮 1、按钮 2 和按钮 3。如果我按 1，然后按按钮 3 中断它，通常我可以继续程序仍在运行。但是，当我按下按钮 2 时，按钮 3 不会停止视频，但会终止工作，并且闪烁的 LED 不会在 GPIO 中清除。它通常处于 "ON" 状态。我已经为此奋斗了一两个星期，希望能得到一些帮助。如有必要，欢迎您重写；盯着屏幕看这么久，我头疼不已。该代码来自本网站上的各种其他代码，其他代码与我自己的一些修改合并。请问你能帮忙吗？

#!/usr/bin/env python3

import RPi.GPIO as GPIO
from omxplayer.player import OMXPlayer
from pathlib import Path
import time

GPIO.setmode(GPIO.BCM)

GPIO.setup(13, GPIO.OUT)
GPIO.setup(17, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(18, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(24, GPIO.IN, pull_up_down=GPIO.PUD_UP)

VIDEO_PATH1 = Path("/home/pi/Videos/ship.mp4")
VIDEO_PATH2 = Path("/home/pi/Videos/twist.mp4")

def blink():
    for j in range(0,5):
        GPIO.output(13, GPIO.HIGH)  # led on
        time.sleep(0.8)
        GPIO.output(13, GPIO.LOW) # led off
        time.sleep(0.8)

last_state1 = True
last_state2 = True

input_state1 = True
input_state2 = True
quit_video = True

playit = False

playit2 = False

while True:
    #Read states of inputs
    input_state1 = GPIO.input(17)
    input_state2 = GPIO.input(18)
    quit_video = GPIO.input(24)


    #If GPIO(17) is shorted to Ground
    if input_state1 == last_state1:
        if (playit and not input_state1):
            player.quit()
            player = OMXPlayer(VIDEO_PATH1)
            playit = True
        elif not input_state1:
            player = OMXPlayer(VIDEO_PATH1)
            playit = True

    #If GPIO(18) is shorted to Ground
    if input_state2 == last_state2:
        if (playit2 and not input_state2):
            player.quit()
            player = OMXPlayer(VIDEO_PATH2)
            blink()
            playit2 = True
        elif not input_state2:
            player = OMXPlayer(VIDEO_PATH2)
            blink()
            playit2 = True

    #If omxplayer is running and GIOP(17) and GPIO(18) are not
        elif (playit and playit2 and input_state1 and input_state2):
            player.quit()
            playit = False
            playit2 = False

    #GPIO(24) to close omxplayer manually - used during debug
    if quit_video == False:
        player.quit()
        GPIO.output(13,GPIO.LOW)   # led off
        GPIO.cleanup()             # Release resource
        playit = False
        playit2 = False


    #Set last_input states
    last_state1 = input_state1
    last_state2 = input_state2'

更新：

    '#!/usr/bin/env python3

    import RPi.GPIO as GPIO
    import time
    from omxplayer.player import OMXPlayer
    from pathlib import Path
    from time import sleep

    GPIO.setmode(GPIO.BCM)
    GPIO.setwarnings(False) 

    GPIO.setup(13,GPIO.OUT)
    GPIO.setup(17, GPIO.IN, pull_up_down=GPIO.PUD_UP)
    GPIO.setup(18, GPIO.IN, pull_up_down=GPIO.PUD_UP)
    GPIO.setup(24, GPIO.IN, pull_up_down=GPIO.PUD_UP)


    VIDEO_PATH1 = Path("/home/pi/Videos/ship.mp4")
    VIDEO_PATH2 = Path("/home/pi/Videos/twist.mp4")

    last_state1 = True
    last_state2 = True
    last_state3 = True

    input_state1 = True
    input_state2 = True
    quit_video = True

    playit = False
    playit2 = False

    def blink():
        while player.is_playing():
            GPIO.output(13,GPIO.HIGH)
            time.sleep(0.8)
            print("LED is ON!")
            GPIO.output(13,GPIO.LOW)
            time.sleep(0.8)
            print("LED is OFF!!")

    while True:
        #Read states of inputs
        input_state1 = GPIO.input(17)
        input_state2 = GPIO.input(18)
        quit_video = GPIO.input(24)

        #If GPIO(17) is shorted to Ground
        if input_state1 == last_state1:
            if (playit and not input_state1):
                player.quit()
                player = OMXPlayer(VIDEO_PATH1)
                playit = True
            elif not input_state1:
                player = OMXPlayer(VIDEO_PATH1)
                playit = True

        #If GPIO(18) is shorted to Ground
        if input_state2 == last_state2:
            if (playit2 and not input_state2):
                player.quit()
                player = OMXPlayer(VIDEO_PATH2)
                blink()
                playit2 = True

            elif not input_state2:
                player = OMXPlayer(VIDEO_PATH2)
                print("program is running")
                blink()
                playit2 = True


        #If omxplayer is running and GIOP(17) and GPIO(18) are not shorted to Ground
        elif (playit and playit2 and input_state1 and input_state2):
            player.quit()
            playit = False
            playit2 = False

        #GPIO(24) to close omxplayer manually - used during debug
        if quit_video == False:
            player.quit()
            playit = False
            playit2 = False
            GPIO.output(13, GPIO.LOW)   # led off

        #Set last_input states
        last_state1 = input_state1
        last_state2 = input_state2
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1 回答 1

0

我会使用一个紧密的循环来检查按钮并根据时间增量切换 LED。类似于以下内容：

#!/usr/bin/env python3

import RPi.GPIO as GPIO
import time,datetime,signal,sys
from omxplayer.player import OMXPlayer

def playerExit(code):
    print('exit',code)
    GPIO.output(ledGPIO,GPIO.LOW)
    global videoPlaying
    videoPlaying=False

def playVideo(video):
    global player,videoPlaying
    if player==None:
        player=OMXPlayer(video)
        player.exitEvent += lambda _, exit_code: playerExit(exit_code)
    else:
        player.load(video)
    videoPlaying=True

def signalHandler(sig,frame):
    print('Ctrl+C pressed')
    quitting()
    sys.exit(0)

def quitPlayerLED():
    GPIO.output(ledGPIO,GPIO.LOW)
    if player!=None:
        player.quit()

# gpio,video/quit,blink T/F
buttonVideos = [[17,"/home/pi/Videos/ship.mp4",False],
                [18,"/home/pi/Videos/twist.mp4",True],
                [24,"quit",False]]
ledGPIO = 13

GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False) 

GPIO.setup(ledGPIO,GPIO.OUT)
GPIO.output(ledGPIO,GPIO.LOW)
for buttonVideo in buttonVideos:
    GPIO.setup(buttonVideo[0], GPIO.IN, pull_up_down=GPIO.PUD_UP)

signal.signal(signal.SIGINT,signalHandler)

player = None
videoPlaying = False
blink = False
ledOn = False
toggle=datetime.datetime.now()

while True:
    # check buttons
    for buttonVideo in buttonVideos:
        if GPIO.input(buttonVideo[0]) == GPIO.LOW:
            print(buttonVideo[0],'pressed')
            if buttonVideo[1] == "quit":
                quitPlayerLED()
            else:
                playVideo(buttonVideo[1])
            blink = buttonVideo[2]
            if blink:
                ledOn = True
                toggle=datetime.datetime.now()+datetime.timedelta(seconds=0.8)
            else:
                GPIO.output(ledGPIO,GPIO.LOW)
            break

    # blink led        
    if blink and videoPlaying:
        if datetime.datetime.now() > toggle:
            print(ledOn)
            GPIO.output(ledGPIO,ledOn)
            ledOn = not ledOn
            toggle = datetime.datetime.now()+datetime.timedelta(seconds=0.8)

    time.sleep(0.1)
于 2019-01-02T14:42:03.503 回答