想实现如下功能：上电时等待检测信号（亮蓝灯），信号触发中断之后开始检测线段（此时亮绿灯），检测到之后红灯闪一下，又开始等待下一次的检测信号。代码如下：脱机运行正常，但是接IDE调试时外部中断触发两三次就会报错：Uncaught exception in ExtInt interrupt handler line 15 RuntimeError:

import sensor, image, time,pyb,micropython,utime
from pyb import Pin, ExtInt

sensor.reset()
sensor.set_pixformat(sensor.RGB565) # grayscale is faster
sensor.set_framesize(sensor.QQVGA)
sensor.skip_frames(time = 2000)
clock = time.clock()
blue = pyb.LED(3)
green = pyb.LED(2)
red = pyb.LED(1)
global start_flag
start_flag =0  #上电时等待开始检测的信号

def start(line):
    global start_flag
    start_flag = 1

#外部中断P0口 上升沿触发 回调函数为start
extint = pyb.ExtInt('P0', pyb.ExtInt.IRQ_RISING, pyb.Pin.PULL_NONE, start)

ok = Pin('P1', Pin.OUT_PP)

while(True):
    clock.tick()
    img = sensor.snapshot()
    if enable_lens_corr:
        img.lens_corr(7.8) # 防畸变
    if start_flag == 1:
        blue.off()
        green.on() #开始检测指示灯
        for l in img.find_line_segments((0,45,160,30),merge_distance = 10, max_theta_diff = 180):
            if l.length()>30:
                img.draw_line(l.line(), color = (255, 255, 255))
                start_flag = 0  #找到理想的线之后置零，不在检测
                ok.high()
                red.on()
                utime.sleep_ms(100)
                ok.low()
                red.off()

    elif start_flag == 0:#等待信号时为蓝灯  工作时为绿灯  找到焊缝时开始等待
        blue.on()
        green.off()
#    print('FPS %f' % clock.fps())

我想用两个中断控制两个颜色的灯，while里输出hello world时程序可以正常运行（即下面代码中注释掉的while）。但是加入sensor.snapshot()输出图像时就会报错，错误类型MemoryError: memory allocation failed, heap is locked

import sensor, image, time,pyb,utime
from pyb import Pin, ExtInt
import micropython
micropython.alloc_emergency_exception_buf(100)

sensor.reset()
sensor.set_pixformat(sensor.RGB565)
sensor.set_framesize(sensor.QVGA)
sensor.skip_frames(time = 2000)

clock = time.clock()

a=b=0
blue = pyb.LED(3)
green = pyb.LED(2)
stop_flag = 1
def start(line):
    stop_flag = 0
    blue.off()
    green.on()
    print('start',)

def stop(line):
    blue.on()
    green.off()
    print('stop')

sta = ExtInt(Pin('P4'),ExtInt.IRQ_RISING,Pin.PULL_NONE, start)
sto = ExtInt(Pin('P5'),ExtInt.IRQ_RISING,Pin.PULL_NONE, stop)


while(True):
    clock.tick()
    img = sensor.snapshot()

'''n=0
while True:
    utime.sleep_ms(1000)
    n=n+1
    print('hello world',n)'''

这样还是不行呀

from pyb import Pin, ExtInt
import sensor, image, time,pyb,micropython
micropython.alloc_emergency_exception_buf(100)

sensor.reset()
sensor.set_pixformat(sensor.RGB565)
sensor.set_framesize(sensor.QVGA)
sensor.skip_frames(time = 2000)

clock = time.clock()

def callback(line):
    global ExtInt
    ExtInt.disable()
    print("line =", line)
    ExtInt.enable()
extint = pyb.ExtInt(Pin('P0'), pyb.ExtInt.IRQ_FALLING, pyb.Pin.PULL_UP, callback)
while(True):
    clock.tick()
    img = sensor.snapshot()

@kidswong999 因为之前可能没有消抖措施，所以出现RuntimeError: maximum recursion depth exceeded的错误，然后我在回调函数中加了屏蔽中断和开启中断的指令，再运行就出现上述的效果了。

我知道github上有源码，但问题是我想修改源码啊，我下载下来修改之后能在IDE里面用吗？

另麻烦看一下我的代码有什么问题吗？进入回调函数先屏蔽中断再开中断可以吗

from pyb import Pin, ExtInt
import sensor, image, time,pyb,micropython
micropython.alloc_emergency_exception_buf(100)

sensor.reset()
sensor.set_pixformat(sensor.RGB565)
sensor.set_framesize(sensor.QVGA)
sensor.skip_frames(time = 2000)

clock = time.clock()

def callback(line):
    ExtInt.disable()
    print("line =", line)
    ExtInt.enable()
extint = pyb.ExtInt(Pin('P0'), pyb.ExtInt.IRQ_FALLING, pyb.Pin.PULL_UP, callback)
while(True):
    clock.tick()
    img = sensor.snapshot()

@kidswong999 因为之前可能没有消抖措施，所以出现RuntimeError: maximum recursion depth exceeded的错误，然后我在回调函数中加了屏蔽中断和开启中断的指令，再运行就出现上述的效果了。

from pyb import Pin, ExtInt
import sensor, image, time,pyb,micropython
micropython.alloc_emergency_exception_buf(100)

sensor.reset()
sensor.set_pixformat(sensor.RGB565)
sensor.set_framesize(sensor.QVGA)
sensor.skip_frames(time = 2000)

clock = time.clock()

def callback(line):
    ExtInt.disable()
    print("line =", line)
    ExtInt.enable()
extint = pyb.ExtInt(Pin('P0'), pyb.ExtInt.IRQ_FALLING, pyb.Pin.PULL_UP, callback)
while(True):
    clock.tick()
    img = sensor.snapshot()

@kidswong999 新代码如下
from pyb import Pin, ExtInt
import sensor, image, time,pyb,micropython
micropython.alloc_emergency_exception_buf(100)

sensor.reset()
sensor.set_pixformat(sensor.RGB565)
sensor.set_framesize(sensor.QVGA)
sensor.skip_frames(time = 2000)

clock = time.clock()

def callback(line):
ExtInt.disable()
print("line =", line)
ExtInt.enable()
extint = pyb.ExtInt(Pin('P0'), pyb.ExtInt.IRQ_FALLING, pyb.Pin.PULL_UP, callback)
while(True):
clock.tick()
img = sensor.snapshot()

出现错误MemoryError: memory allocation failed, heap is locked
您看是什么原因啊？

@kidswong999 运行例子的效果是一直打印intr，还有不太懂例子中的e是什么意思

我想实现触发P0的中断时绿灯亮，P1中断触发蓝灯亮，可是运行之后却没有反应？请问这是什么原因？