RPI Pico MicroPython：如何判断触发中断的引脚？

不用解析字符串，有两种简单可靠的方法：

方法一：访问Pin对象的pin属性 #

MicroPython的RP2 Pin对象自带pin属性，直接就能获取引脚的编号（比如14或15），修改你的代码如下：

from machine import Pin
import time

# 初始化全局变量
button_pressed_count = 0
button_debounce = False
cf_button_status = 0

# 引脚定义
cf_close = Pin(14, Pin.IN, Pin.PULL_UP)
cf_open = Pin(15, Pin.IN, Pin.PULL_UP)

def button_isr(pin):
    global button_pressed_count, button_debounce, cf_button_status  
    time.sleep_ms(1)
    # 获取触发中断的引脚编号
    trigger_pin = pin.pin
    print("触发中断的引脚: GPIO{}".format(trigger_pin))
    
    if not button_debounce:
        print("进入防抖逻辑")
        button_pressed_count += 1
        button_debounce = True    
        # 可根据引脚编号区分处理逻辑
        if trigger_pin == 14:
            cf_button_status = 1  # 对应cf_close引脚
        elif trigger_pin == 15:
            cf_button_status = 2  # 对应cf_open引脚

# 绑定中断
cf_close.irq(trigger=Pin.IRQ_FALLING, handler=button_isr)
cf_open.irq(trigger=Pin.IRQ_FALLING, handler=button_isr)

方法二：通过lambda传递自定义标识 #

如果担心不同MicroPython版本的属性兼容性，还可以在绑定中断时，用lambda给处理函数传递自定义的引脚标识，代码示例：

from machine import Pin
import time

button_pressed_count = 0
button_debounce = False
cf_button_status = 0

cf_close = Pin(14, Pin.IN, Pin.PULL_UP)
cf_open = Pin(15, Pin.IN, Pin.PULL_UP)

def button_isr(pin, pin_tag):
    global button_pressed_count, button_debounce, cf_button_status  
    time.sleep_ms(1)
    print("触发中断的引脚标识: {}".format(pin_tag))
    
    if not button_debounce:
        print("进入防抖逻辑")
        button_pressed_count += 1
        button_debounce = True    
        cf_button_status = pin_tag

# 绑定中断时传递自定义标识
cf_close.irq(trigger=Pin.IRQ_FALLING, handler=lambda pin: button_isr(pin, "close"))
cf_open.irq(trigger=Pin.IRQ_FALLING, handler=lambda pin: button_isr(pin, "open"))

注意：用time.sleep_ms(1)做防抖不够严谨，容易阻塞中断处理，建议改用时间戳对比的方式实现防抖。

内容的提问来源于stack exchange，提问作者Adrian