python - TraceBack(最后一次调用)和 GPIO.setmode(GPIO.BOARD) 或 GPIO.setmode(GPIO.BCM) 错误

Question

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。当我运行脚本时，LED1 会亮起然后熄灭，程序因以下错误而关闭:

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"

Answer 1

问题是您在每个方法的末尾调用 GPIO.cleanup()。如 documentation 中所述, 注意 GPIO.cleanup() 也会清除正在使用的管脚编号系统。 你想要的是 GPIO.cleanup(channel) 而不是，其中 channel 对应于 脚本中的 LED1、LED2、LED3。

最佳做法是设置和清理 channel ONLY ONCE，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"