esp8266: Ctrl-c during time.sleep resets the board

[tdicola]

Odd thing I noticed, perhaps not related to our firmware but worth looking at further, if you press Ctrl-C during a time.sleep operation the board does a soft reset.

To repro, in the REPL run:

import time
time.sleep(5)

Then press Ctrl-C and you'll see the board resets instead of breaking out of the sleep:

>>> import time
>>> time.sleep(5)
PYB: soft reboot
#13 ets_task(40100164, 3, 3fff8408, 4)
Adafruit MicroPython v1.8.6-147-gd2aa05a on 2016-11-28; ESP module with ESP8266
>>> 

[tdicola]

Hrm it looks like this works fine with upstream esp8266, here's the same behavior on micropython.org 1.8.6:

>>> import time
>>> time.sleep(5)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
KeyboardInterrupt: 
>>> 

Perhaps when the exception handler runs some state to remember to kick the watchdog isn't firing and the ESP8266 resets itself?

[dhalbert]

This bug came back as of 2.0.0-rc1 or earlier, in atmel-samd. Also see the same thing with

while True: pass

then type ctrl-C. Board will soft-reset.

[dhalbert]

Fixed by #241