TraceBack(最后一次调用),以及 GPIO.setmode(GPIO.BOARD) 或 GPIO.setmode(GPIO.BCM) 错误

TraceBack (most recent call last), and GPIO.setmode(GPIO.BOARD) or GPIO.setmode(GPIO.BCM) errors

我一直在努力编写一个脚本,该脚本将 Pi 的 BCM 引脚 17、27 和 10 打开 1 秒,然后关闭 1 秒,连续 100 次。当我 运行 时,脚本 LED1 将打开然后关闭,程序关闭并出现此错误:

Traceback (most recent call last):
  File "LedBlink.py", line 47, in <module>
    LED2Blink()
  File "LedBlink.py", line 27, in LED2Blink
    GPIO.setup(LED2, GPIO.OUT)
RuntimeError: Please set pin numbering mode using     GPIO.setmode(GPIO.BOARD) or GPIO.setmode(GPIO.BCM)

import RPi.GPIO as GPIO
import time

LED1 = 17
LED2 = 27
LED3 = 10

GPIO.setmode(GPIO.BCM)

def LED1Blink():
        GPIO.setup(LED1, GPIO.OUT)
        GPIO.output(LED1,True) 
        time.sleep(1)  
        GPIO.output(LED1,False)
        time.sleep(1)
        GPIO.cleanup()

def LED2Blink():
        GPIO.setup(LED2, GPIO.OUT)
        GPIO.output(LED2,True) 
        time.sleep(1)  
        GPIO.output(LED2,False)
        time.sleep(1)
        GPIO.cleanup()

def LED3Blink():
        GPIO.setup(LED3, GPIO.OUT)
        GPIO.output(LED3,True) 
        time.sleep(1)  
        GPIO.output(LED3,False)
        time.sleep(1)
        GPIO.cleanup()

i = 0
while i < 100:
       LED1Blink()
       LED2Blink()
       LED3Blink()
       i + 1
else:
       print "finished loop"

问题是您在每个方法的末尾调用 GPIO.cleanup()。如 documentation 中所述,Note that GPIO.cleanup() also clears the pin numbering system in use. 您想要的是 GPIO.cleanup(channel),而通道对应于脚本中的 LED1, LED2, LED3

最佳做法是设置清理频道仅一次,例如

import RPi.GPIO as GPIO
import time

LED1 = 17
LED2 = 27
LED3 = 10

GPIO.setmode(GPIO.BCM)
GPIO.setup(LED1, GPIO.OUT)
GPIO.setup(LED2, GPIO.OUT)
GPIO.setup(LED3, GPIO.OUT)

def LED1Blink():
        GPIO.output(LED1,True) 
        time.sleep(1)  
        GPIO.output(LED1,False)
        time.sleep(1)

def LED2Blink():
        GPIO.output(LED2,True) 
        time.sleep(1)  
        GPIO.output(LED2,False)
        time.sleep(1)

def LED3Blink():
        GPIO.output(LED3,True) 
        time.sleep(1)  
        GPIO.output(LED3,False)
        time.sleep(1)

i = 0
if i < 100:
       LED1Blink()
       LED2Blink()
       LED3Blink()
       i + 1
else:
       GPIO.cleanup()
       print "finished loop"

切勿多次调用 GPIO.cleanup(),因为在清除 PINS 的同时,它还会清除 Pin MODE!因此,如果您在程序之间调用它,那么下一个语句执行将没有 pin MODE,并且会发出错误。 "TraceBack (most recent call last), and GPIO.setmode(GPIO.BOARD) or GPIO.setmode(GPIO.BCM) errors"

因此,如果满足特定条件,请始终在末尾或程序可以 end/break 之间的任何地方使用它。