[Raspberry Pi Pico Review] Unable to identify USB serial port

dql2016

[Raspberry Pi Pico Review] Unable to identify USB serial port [Copy link]

 

 

I used tonny to save a main.py program for flashing an LED to disk, and then the pico broke...

After flashing the official MicroPython firmware, the USB virtual serial port cannot be displayed. It seems that the LED flashing program is running. Then after a while, the USB cannot be recognized and the LED does not flash.

dcexpert

What other operations have you done in the meantime? Generally speaking, you can enter the download mode and there is no problem with the USB. You need to check whether there is a problem with the Windows system. You can try restarting it and check whether there is a problem in the device manager.

dql2016

Restarting Windows doesn't help

dql2016

Changing the laptop to test doesn't help

dcexpert

dql2016 posted on 2021-5-16 12:07 Changing the laptop to test is useless

There is an unknown device in the device manager. Is it a driver problem?

dcexpert

dql2016 posted on 2021-5-16 12:07 Changing the laptop to test is useless

Is the USB device occupied by the virtual machine?

You can also try another USB cable, as the quality of current USB cables varies.

dql2016

dcexpert posted on 2021-5-16 15:05 Is the USB device occupied by the virtual machine? Also, try changing the USB cable. The quality of current USB cables varies.

No, changing the line won’t work.

dql2016

dql2016 posted on 2021-5-16 15:36 No, changing the line won’t work either.

The virtual machine is not turned on and will not occupy

dql2016

dql2016 posted on 2021-5-16 15:38 The virtual machine is not turned on and will not be occupied

Win10 device manager shows that USB descriptor request failed

tagetage

The key point is main.py. main is resident, that is, it runs when the computer is turned on. If you change to a new WIN10 computer, you must press and hold the PICO button and then insert it into the USB port, and then try it again without releasing the button.

soso

Try the method on the 10th floor. Did your problem get solved?

w494143467

If you solve the problem, please post it~

dql2016

tagetage posted on 2021-5-16 17:14 The focus is on main.py. main is resident, that is, it runs when the computer is turned on. If you change to a new WIN10 computer, you must hold down the PICO button before inserting...

Still not letting go? Go back and try again

tagetage

dql2016 posted on 2021-5-17 12:39 Still not letting go? Go back and try

Yes, don’t release it. Some USB requests may take up to one minute to be correctly identified, which means you should not release the button for even one minute.

tagetage

If it still doesn't work, you can change the firmware name to firmware.uf2 and flash it to see if it works.

dql2016

tagetage posted on 2021-5-16 17:14 The focus is on main.py. main is resident, that is, it runs when the computer is turned on. If you change to a new WIN10 computer, you must hold down the PICO button before inserting...

I kept pressing it for 2 minutes. But it didn't respond after it recognized the USB drive.

dql2016

dql2016 posted on 2021-5-17 20:57 Press and hold for 2 minutes. . . No response after the USB flash drive is recognized

Press and hold, drag in the MicroPython firmware, press and hold for 2 minutes or more, then release, and the LED will flash for a while and then go out, and then the USB cannot be recognized, but this time the address cannot be set, the previous descriptor request failed

dcexpert

I think your board has a problem, please change it.

tagetage

Check the Pico USB port to see if it is loose or the solder joints are broken. Check the hardware.

dql2016

The disk can be recognized, so the USB hardware interface is OK.