Question

在我的项目中，我正在使用树莓派（带有python 3）。我试图通过按钮引入一个中断，我可以停止或暂停主要功能并处理另一个功能，完成该功能后应释放主要功能。我正在使用这个：

GPIO.add_event_detect(channel, GPIO.FALLING, callback=my_callback, bouncetime=200)

但是我面临一个问题，当按下按钮时，“ main”和“ my_callback”将同时执行！

然后我尝试在线程上工作，将main和my_callback设为线程，但是结果相同。

任何人都可以帮助我。这是我的代码。

import os
import MySQLdb
import RPi.GPIO as GPIO
from time import sleep
from RPLCD.gpio import CharLCD

GPIO.setmode(GPIO.BOARD)
GreenRight = 3
RedRight = 5
GreenUp = 11
RedUp = 13
PushButton = 15
YellowRight = 40

GPIO.setwarnings(False)
GPIO.setup(GreenRight, GPIO.OUT)
GPIO.setup(RedRight, GPIO.OUT)
GPIO.setup(GreenUp, GPIO.OUT)
GPIO.setup(RedUp, GPIO.OUT)
GPIO.setup(YellowRight, GPIO.OUT)

GPIO.setup(PushButton, GPIO.IN, pull_up_down= GPIO.PUD_UP)


db = MySQLdb.connect(host = "***.***.*.***", port=3306, user = "****", passwd = "***", db = "mydb")
cur = db.cursor()

lcd = CharLCD(cols=16, rows=2, pin_rs=37, pin_e=35, pins_data=[33, 31, 29, 23],numbering_mode=GPIO.BOARD)
lcd.clear()

def TurnOnGreenHorizental(time):

    sql1 = "UPDATE `test` SET `Green Light For Horizental`='ON' WHERE `Street`='StreetRight'"
    cur.execute(sql1)
    sql2 = "UPDATE `test` SET `Red Light For Horizental`='OFF' WHERE `Street`='StreetLeft'"
    cur.execute(sql1)

    i=time
    GPIO.output(GreenRight, True)
    GPIO.output(RedRight, False)
    GPIO.output(GreenUp, False)
    GPIO.output(RedUp, True)
    GPIO.output(YellowRight, False)

    while i > 0:
        lcd.clear()
        lcd.write_string("HS Green Lights ON for "+str(i)+ " s")
        sleep(1)
        i=i-1

    lcd.clear()
    GPIO.output(GreenRight, False)
    GPIO.output(RedRight, False)    
    GPIO.output(RedUp, False)
    GPIO.output(GreenUp, False)
    GPIO.output(YellowRight, False)
    sleep(4)

def TurnOnVertical(time):


    sql1 = "UPDATE `test` SET `Green Light For Horizental`='OFF' WHERE `Street`='StreetRight'"
    cur.execute(sql1)
    sql2 = "UPDATE `test` SET `Red Light For Horizental`='ON' WHERE `Street`='StreetLeft'"
    cur.execute(sql1)

    i = time
    GPIO.output(GreenRight, True)
    GPIO.output(RedRight, False)
    GPIO.output(GreenUp, False)
    GPIO.output(RedUp, True)
    GPIO.output(YellowRight, False)

    while i > 0:
        lcd.clear()
        lcd.write_string("HS Green Lights ON for "+str(i)+ " s")
        sleep(1)
        i=i-1

    lcd.clear()
    GPIO.output(GreenRight, False)
    GPIO.output(RedRight, False)    
    GPIO.output(RedUp, False)
    GPIO.output(GreenUp, False)
    GPIO.output(YellowRight, False)
    sleep(4)


def my_callback(channel):    

    c=12
    print("button is pressed" )
    GPIO.output(YellowRight, True)
    GPIO.output(GreenUp,False)
    GPIO.output(RedUp,False)
    GPIO.output(RedRight,False)
    GPIO.output(GreenRight,False)

    while c >0:
       lcd.clear()
       lcd.write_string("Passenger light is ON  for "+str(c)+ " s")
       sleep(1)
       c=c-1

QUERY= "SELECT `Action` FROM `test`"
cur.execute(QUERY)
myresult = cur.fetchall()

def Array():
    array= []
    for x in myresult:
        y = str(x[0])
        array.append(y)
    return array

Action = Array()

def main():
    while True:

        if ((Action[0]=='1' and Action[1]=='0') or (Action[0]=='0' and Action[1]=='1')):
             QUERY= "SELECT `Time` FROM `test` WHERE `Street`='StreetRight' "
             cur.execute(QUERY)
             myresult = cur.fetchall()
             t=Array()
             time=t[0]
             TurnOnGreenHorizental(int(time))


        elif ((Action[2]=='1' and Action[3]=='0') or (Action[2]=='0' and Action[3]=='1')):
             QUERY= "SELECT `Time` FROM `test` WHERE `Street`='StreetUp' "
              cur.execute(QUERY)
            myresult = cur.fetchall()
             t=Array()
             time=t[0]
             print(time)
             TurnOnGreenVertical(int(time))
db.commit()
GPIO.add_event_detect(PushButton, GPIO.FALLING,callback=my_callback,bouncetime=12000)

main()

使用python 3在树莓派中中断

0 个答案: