Использование кнопок GPIO для управления Raspbmc

Question

Я пытаюсь написать код для проекта xbmc автомобиля. Я сделал свою собственную кнопочную панель с выдвижными резисторами и подключен к портам GPIO. Установленный python и аддон GPIO. Моя цель - поймать нажатия кнопок, и если кнопка удерживается в течение 1,5 секунд, она будет выполнять другую команду для xbmc (например, правая клавиша будет пропустить следующий трек, если удерживаться). Я не слишком хорошо знаком с Python, так что это был довольно долгий процесс, когда я попал туда, где я есть. Я решил использовать функцию GPIO.add_event_detect(), поскольку она имеет встроенный debouncer, но я думаю, что она новая, потому что я не могу найти много примеров ее использования. Это то, что бросает ошибки:

Traceback (most recent call last): 
    File "buttons.py", line 15, in <module> 
    GPIO.add_event_detect(buttons[index], GPIO.RISING, bouncetime=200) 
RuntimeError: Edge detection already enabled for this GPIO channel 


#!/usr/bin/env python 
import Rpi.GPIO as GPIO 
import time, os, httplib, json 
GPIO.setmode(GPIO.BCM) 

buttons = [4, 17, 18, 22, 23, 24, 27] 
numbuttons = len(buttons) 
index = 0 
for index in numbuttons: 
    GPIO.setup(index, GPIO.IN, pull_up_down=GPIO.PUD_DOWN) 

while True: 
    index = 0 
    for index in numbuttons: 
     GPIO.add_event_detect(buttons[index], GPIO.RISING, bouncetime=200) 
     if GPIO.event_detected(buttons[index]): 
      time_pressed = time.time() 
      GPIO.add_event_detect(buttons[index], GPIO.FALLING, bouncetime=200) 
      if GPIO.event_detected(buttons[index]): 
       time_released = time.time() 
       if (time_released - time_pressed) >= 1.5: 
        button_held(index) 
       else: 
        button_pressed(index) 
    time.sleep(0.01) 

def button_pressed(index): 
    url = "/jsonrpc?request={%22jsonrpc%22:%222.0%22,%22method%22:%22" 
    url2 = ",%22id%22:1}" 
    player = "Player.GetActivePlayers%22" 
    playcode = "Player.PlayPause%22,%22params%22:{%22playerid%22:" 
    guidecode = "Player.GetProperties%22,%22params%22:{%22playerid%22:" 
    upcode = "Input.Up%22,%22params%22:{%22playerid%22:" 
    downcode = "Input.Down%22,%22params%22:{%22playerid%22:" 
    leftcode = "Input.Left%22,%22params%22:{%22playerid%22:" 
    rightcode = "Input.Right%22,%22params%22:{%22playerid%22:" 
    backcode = "Input.Back%22,%22params%22:{%22playerid%22:" 
    conn = httplib.HTTPConnection("127.0.0.1:8080") 
    if index == 0: 
     conn.request("GET", url + player + url2) 
     r = conn.getresponse() 
     j = json.loads(r.read()) 
     playeron = j["result"] 
     if json.dumps(playeron) == "[]": 
      conn.request("GET", url + "input.select%22" + url2) 
      conn.close() 
     else: 
      playerid = json.dumps(j["result"][0]["playerid"]) 
      conn.request("GET", url + guidecode + playerid + "}" + url2) 
      conn.close() 
     conn.close() 
     print("execute xbmc guide") 
    elif index == 1: 
     conn.request("GET", url + player + url2) 
     r = conn.getresponse() 
     j = json.loads(r.read()) 
     playeron = j["result"] 
     if json.dumps(playeron) == "[]": 
      conn.request("GET", url + "input.select%22" + url2) 
      conn.close() 
     else: 
      playerid = json.dumps(j["result"][0]["playerid"]) 
      conn.request("GET", url + leftcode + playerid + "}" + url2) 
      conn.close() 
     conn.close() 
     print("execute xbmc left") 
    elif index == 2: 
     conn.request("GET", url + player + url2) 
     r = conn.getresponse() 
     j = json.loads(r.read()) 
     playeron = j["result"] 
     if json.dumps(playeron) == "[]": 
      conn.request("GET", url + "input.select%22" + url2) 
      conn.close() 
     else: 
      playerid = json.dumps(j["result"][0]["playerid"]) 
      conn.request("GET", url + playcode + playerid + "}" + url2) 
      conn.close() 
     conn.close() 
     print("execute xbmc play/pause") 
    elif index == 3: 
     conn.request("GET", url + player + url2) 
     r = conn.getresponse() 
     j = json.loads(r.read()) 
     playeron = j["result"] 
     if json.dumps(playeron) == "[]": 
      conn.request("GET", url + "input.select%22" + url2) 
      conn.close() 
     else: 
      playerid = json.dumps(j["result"][0]["playerid"]) 
      conn.request("GET", url + upcode + playerid + "}" + url2) 
      conn.close() 
     conn.close() 
     print("execute xbmc up") 
    elif index == 4: 
     conn.request("GET", url + player + url2) 
     r = conn.getresponse() 
     j = json.loads(r.read()) 
     playeron = j["result"] 
     if json.dumps(playeron) == "[]": 
      conn.request("GET", url + "input.select%22" + url2) 
      conn.close() 
     else: 
      playerid = json.dumps(j["result"][0]["playerid"]) 
      conn.request("GET", url + backcode + playerid + "}" + url2) 
      conn.close() 
     conn.close() 
     print("execute xbmc backspace") 
    elif index == 5: 
     conn.request("GET", url + player + url2) 
     r = conn.getresponse() 
     j = json.loads(r.read()) 
     playeron = j["result"] 
     if json.dumps(playeron) == "[]": 
      conn.request("GET", url + "input.select%22" + url2) 
      conn.close() 
     else: 
      playerid = json.dumps(j["result"][0]["playerid"]) 
      conn.request("GET", url + downcode + playerid + "}" + url2) 
      conn.close() 
     conn.close() 
     print("execute xbmc down") 
    elif index == 6: 
     conn.request("GET", url + player + url2) 
     r = conn.getresponse() 
     j = json.loads(r.read()) 
     playeron = j["result"] 
     if json.dumps(playeron) == "[]": 
      conn.request("GET", url + "input.select%22" + url2) 
      conn.close() 
     else: 
      playerid = json.dumps(j["result"][0]["playerid"]) 
      conn.request("GET", url + rightcode + playerid + "}" + url2) 
      conn.close() 
     conn.close() 
     print("execute xbmc right") 

def button_held(index): 
    url = "/jsonrpc?request={%22jsonrpc%22:%222.0%22,%22method%22:%22" 
    url2 = ",%22id%22:1}" 
    player = "Player.GetActivePlayers%22" 
    playcode = "Player.PlayPause%22,%22params%22:{%22playerid%22:" 
    upcode = "Input.Up%22,%22params%22:{%22playerid%22:" 
    downcode = "Input.Down%22,%22params%22:{%22playerid%22:" 
    backcode = "Input.Back%22,%22params%22:{%22playerid%22:" 
    nextcode = "Player.GoNext%22,%22params%22:{%22playerid%22:" 
    prevcode = "Player.GoPrevious%22,%22params%22:{%22playerid%22:" 
    shuffcode = "Player.Shuffle%22,%22params%22:{%22playerid%22:" 
    mutecode = "Application.SetMute%22,%22params%22:{%22playerid%22:" 
    conn = httplib.HTTPConnection("127.0.0.1:8080") 
    if index == 0: 
     conn.request("GET", url + player + url2) 
     r = conn.getresponse() 
     j = json.loads(r.read()) 
     playeron = j["result"] 
     if json.dumps(playeron) == "[]": 
      conn.request("GET", url + "input.select%22" + url2) 
      conn.close() 
     else: 
      playerid = json.dumps(j["result"][0]["playerid"]) 
      conn.request("GET", url + shuffcode + playerid + "}" + url2) 
      conn.close() 
     conn.close() 
     print("execute xbmc guide") 
    elif index == 1: 
     conn.request("GET", url + player + url2) 
     r = conn.getresponse() 
     j = json.loads(r.read()) 
     playeron = j["result"] 
     if json.dumps(playeron) == "[]": 
      conn.request("GET", url + "input.select%22" + url2) 
      conn.close() 
     else: 
      playerid = json.dumps(j["result"][0]["playerid"]) 
      conn.request("GET", url + prevcode + playerid + "}" + url2) 
      conn.close() 
     conn.close() 
     print("execute xbmc left") 
    elif index == 2: 
     conn.request("GET", url + player + url2) 
     r = conn.getresponse() 
     j = json.loads(r.read()) 
     playeron = j["result"] 
     if json.dumps(playeron) == "[]": 
      conn.request("GET", url + "input.select%22" + url2) 
      conn.close() 
     else: 
      playerid = json.dumps(j["result"][0]["playerid"]) 
      conn.request("GET", url + playcode + playerid + "}" + url2) 
      conn.close() 
     conn.close() 
     print("execute xbmc play/pause") 
    elif index == 3: 
     conn.request("GET", url + player + url2) 
     r = conn.getresponse() 
     j = json.loads(r.read()) 
     playeron = j["result"] 
     if json.dumps(playeron) == "[]": 
      conn.request("GET", url + "input.select%22" + url2) 
      conn.close() 
     else: 
      playerid = json.dumps(j["result"][0]["playerid"]) 
      conn.request("GET", url + upcode + playerid + "}" + url2) 
      conn.close() 
     conn.close() 
     print("execute xbmc up") 
    elif index == 4: 
     conn.request("GET", url + player + url2) 
     r = conn.getresponse() 
     j = json.loads(r.read()) 
     playeron = j["result"] 
     if json.dumps(playeron) == "[]": 
      conn.request("GET", url + "input.select%22" + url2) 
      conn.close() 
     else: 
      playerid = json.dumps(j["result"][0]["playerid"]) 
      conn.request("GET", url + backcode + playerid + "}" + url2) 
      conn.close() 
     conn.close() 
     print("execute xbmc backspace") 
    elif index == 5: 
     conn.request("GET", url + player + url2) 
     r = conn.getresponse() 
     j = json.loads(r.read()) 
     playeron = j["result"] 
     if json.dumps(playeron) == "[]": 
      conn.request("GET", url + "input.select%22" + url2) 
      conn.close() 
     else: 
      playerid = json.dumps(j["result"][0]["playerid"]) 
      conn.request("GET", url + downcode + playerid + "}" + url2) 
      conn.close() 
     conn.close() 
     print("execute xbmc down") 
    elif index == 6: 
     conn.request("GET", url + player + url2) 
     r = conn.getresponse() 
     j = json.loads(r.read()) 
     playeron = j["result"] 
     if json.dumps(playeron) == "[]": 
      conn.request("GET", url + "input.select%22" + url2) 
      conn.close() 
     else: 
      playerid = json.dumps(j["result"][0]["playerid"]) 
      conn.request("GET", url + nextcode + playerid + "}" + url2) 
      conn.close() 
     conn.close() 
     print("execute xbmc right") 

Answer 1

Я думал, просто нажимая эту команду и выскакивают ошибки, но я итерация цикла первой. Это имеет смысл, так как приемник событий не может включаться более одного раза. Я просто отредактировал свой код, чтобы инициализировать его, и добавить новое обнаружение события только при нажатии кнопки. Я также очистил код, который я нашел на форуме XBMC, и он работает.

import Rpi.GPIO as GPIO 
import time, os, httplib, json, requests, pdb 
from requests.auth import HTTPBasicAuth 
GPIO.setmode(GPIO.BCM) 

def main(): 
    buttons = [4, 17, 18, 22, 23, 24, 27] 
    numbuttons = len(buttons) 
    index = 0 
    for index in range(numbuttons): 
     GPIO.setup(buttons[index], GPIO.IN, pull_up_down=GPIO.PUD_DOWN) 
     GPIO.add_event_detect(buttons[index], GPIO.RISING, bouncetime=200) 
    while True: 
     index = 0 
     for index in range(numbuttons): 
      if GPIO.event_detected(buttons[index]): 
       GPIO.remove_event_detect(buttons[index]) 
       time_pressed = time.time() 
       GPIO.wait_for_edge(buttons[index], GPIO.FALLING) 
       time.sleep(0.01) 
       time_released = time.time() 
       if (time_released - time_pressed) >= 1.5: 
        button_held(index) 
       else: 
        button_pressed(index) 
       GPIO.add_event_detect(buttons[index], GPIO.RISING, bouncetime=200) 
     time.sleep(0.01) 

def button_pressed(index): 
    url = 'http://192.168.1.138:8888/jsonrpc' 
    postheaders = {'content-type': 'application/json'} 
    command = {"jsonrpc":"2.0", "id": 1, "method": ""} 
    if index == 0: 
     command['method'] = 'Input.Select' 
     print("execute xbmc guide") 
    elif index == 1: 
     command['method'] = 'Input.Left' 
     print("execute xbmc left") 
    elif index == 2: 
     command['method'] = 'Input.Info' 
     print("execute xbmc play/pause") 
    elif index == 3: 
     command['method'] = 'Input.Up' 
     print("execute xbmc up") 
    elif index == 4: 
     command['method'] = 'Input.Back' 
     print("execute xbmc backspace") 
    elif index == 5: 
     command['method'] = 'Input.Down' 
     print("execute xbmc down") 
    elif index == 6: 
     command['method'] = 'Input.Right' 
     print("execute xbmc right") 
    resp = requests.post(url, auth=('xbmc','xbmc'), data=json.dumps(command), headers=postheaders) 

def button_held(index): 
    url = 'http://192.168.1.138:8888/jsonrpc' 
    postheaders = {'content-type': 'application/json'} 
    command = {"jsonrpc":"2.0", "id": 1, "method": ""} 
    if index == 0: 
     command['method'] = 'Player.PlayPause' 
     print("execute xbmc shuffle") 
    elif index == 1: 
     command['method'] = 'Player.GoNext' 
     print("execute xbmc left") 
    elif index == 2: 
     command['method'] = 'Player.SetMute' 
     print("execute xbmc play/pause") 
    elif index == 3: 
     command['method'] = 'Input.SetShuffle' 
     print("execute xbmc up") 
    elif index == 4: 
     command['method'] = 'Input.Back' 
     print("execute xbmc backspace") 
    elif index == 5: 
     command['method'] = 'Input.SetRepeat' 
     print("execute xbmc down") 
    elif index == 6: 
     command['method'] = 'Player.GoPrevious' 
     print("execute xbmc right") 
    resp = requests.post(url, auth=('xbmc','xbmc'), data=json.dumps(command), headers=postheaders) 
if __name__ == '__main__': 
    main()