If boot.py doesn't exit then rp2 port will never initialise USB (soft-bricked) #15230
Description
Port, board and/or hardware
Raspberry Pico
MicroPython version
MicroPython v1.23.0 on 2024-06-02; Raspberry Pi Pico with RP2040
Reproduction
I took my program code and stripped it down to a working repro. There are more lines that could be deleted but help with visualization. The content is saved to boot.py. There is no other file saved on the microcontroller.
With any version prior 1.23 this will yield a serial device in device manager, whenever the device is connected to the computer. With version 1.23 it will not and can only recovered by flashing a firmware version prior 1.23:
import _thread
import asyncio # type: ignore
from time import sleep
import gc
import machine
synchronousLoopAlive: bool = True
anyLoopAlive: bool = True
led = machine.Pin(25, machine.Pin.OUT)
async def yieldingBackgroundTaskOne():
while anyLoopAlive:
print("One")
led.value(not led.value())
await asyncio.sleep_ms(1000)
def synchronousTask():
while synchronousLoopAlive:
sleep(2)
if __name__ == "__main__":
try:
sleep(3)
loop = asyncio.get_event_loop()
gc.collect()
programThread = _thread.start_new_thread(synchronousTask, ())
print("program thread started")
taskOne = loop.create_task(yieldingBackgroundTaskOne())
print("task One started")
loop.run_forever()
except KeyboardInterrupt:
synchronousLoopAlive = False
anyLoopAlive = False
loop.stop()
print("INTERRUPTED - STOPPING EVERYTHING")
except Exception as e:
print(f"error occurred: {e}")Expected behaviour
Expected a serial device in device manager as in all versions prior 1.23.
Observed behaviour
No serial device in device manager with micropython 1.23, but with any version prior 1.23.
Additional Information
No, I've provided everything above.
Code of Conduct
Yes, I agree