Test program for GPIO (IN/OUT/PWM) on the Raspberry Pi

full_test.py

import time
import RPi.GPIO as GPIO
from threading import Thread

def setup():
  GPIO.setwarnings(False)
  GPIO.setmode(GPIO.BCM)
  GPIO.setup(2, GPIO.OUT, 
             initial=GPIO.LOW)
  GPIO.setup(22, GPIO.IN)
  GPIO.setup(10, GPIO.IN)
  GPIO.setup(26, GPIO.IN)
  GPIO.setup(12, GPIO.OUT)
  GPIO.setup(13, GPIO.OUT)
  global red
  global green
  red = GPIO.PWM(12, 50)  # 50Hz
  green = GPIO.PWM(13, 50)
  red.start(0)
  green.start(0)
  Thread(target=ck_btn_forevr).start()
  GPIO.add_event_detect(
    22, GPIO.RISING,
    callback=lambda _: print(
            "<- Switch to the left."))
  GPIO.add_event_detect(
    10, GPIO.RISING,
    callback=lambda _: print(
           "-> Switch to the right."))
    
def loop():
  for dc in range(0, 101, 5):
    red.ChangeDutyCycle(dc)
    time.sleep(0.1)
  GPIO.output(2, GPIO.HIGH)
  for dc in range(100, -1, -5):
    red.ChangeDutyCycle(dc)
    green.ChangeDutyCycle(100-dc)
    time.sleep(0.1)
  GPIO.output(2, GPIO.LOW)
  for dc in range(100, -1, -5):
     green.ChangeDutyCycle(dc)
     time.sleep(0.1)

def ck_btn_forevr():
  while True:
    GPIO.wait_for_edge(26,GPIO.RISING)
    print("Button pressed")
    time.sleep(0.1)

try:
  setup()
  while True:
    loop()
except KeyboardInterrupt:
  pass
finally:
  red.stop()
  green.stop()
  GPIO.cleanup()