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我正在尝试用我的树莓派 pi4 与树莓派 pico 通信。我的操作系统是 Ubuntu server 20.04 for Raspberry pi。

当我运行下面的代码时，LED 会亮起，当我按下停止时它会关闭，但它会不断抛出下面的错误。

如果您知道解决方案，请告诉我。

我的代码：

from machine import Pin, Timer
led = Pin(25, Pin.OUT)
tim = Timer()
def tick(timer):
 global led
 led.toggle()
tim.init(freq=2.5, mode=Timer.PERIODIC, callback=tick)

错误：

NameError: name 'led' isn't defined
Traceback (most recent call last):
  File "<stdin>", line 7, in tick
NameError: name 'led' isn't defined
Traceback (most recent call last):
  File "<stdin>", line 7, in tick
NameError: name 'led' isn't defined

Could not enter REPL. Trying again with 1 second waiting time...
Could not enter REPL. Trying again with 3 second waiting time...
Could not enter REPL. Trying again with 5 second waiting time...
Could not enter REPL. Giving up. Read bytes:


Your options:

  - check connection properties;
  - make sure the device has suitable firmware;
  - make sure the device is not in bootloader mode;
  - reset the device and try again;
  - try other serial clients (Putty, TeraTerm, screen, ...);
  - ask for help in Thonny's forum or issue tracker.

Backend terminated or disconnected. Use 'Stop/Restart' to restart.
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