NUCLEO WL55JC1 dead?

JPablo1 · ‎2023-08-02

Hi, I was working as usual with my NUCLEO WL55JC1 board, powered from external 3.3V. Everything was working correctly and I turned the power suplly off, after turning it on again (next day), the board didn't work. I know the program is not runnin because I had a blinking LED that remains off. If I try to load the program to the board again I get teh following errors:

Error in final launch sequence:

Error message from debugger back end:
Error finishing flash operation
Failed to execute MI command:

When I connect the board to the computer, the biclor LED flashes and then remains red, indicating initialization between the PC and STLINK-V3E is complete, after fail uploading the program the led remains green indicating communication finished and successful but no debug session was even started.

I´d like to know if my board is dead or if there is something I can try to make it work

Regards

JPablo1 · ‎2023-08-03

Hi, I managed to make it work again, here is what happened:

I used CubeProgrammer to access the flah memory, and even though it showed an error on the read operation, it allowed me to perform a full chip erase. After doing that I was able to upload my code to the board again, however, the radio part was not working. I realised that the board was restarting "randomly" and eventually I figured out that it was just after sending data via LoRa. Actually the MCU was generating a reset jus after entering stop2 mode, which was entered after sending a radio packet, so it was indeed sendig data but could´t receve the response because the reset generated when it was supposed to enter low power mode. To solve that I changed the state of the flash option byte nRST_STOP which precisely makes the either MCU restart or keep running when entering low power mode.
That's how I worked around this issue and it has been working ok since then. I suppose the flash content got corrupted but I don't know what the cause might have been.

Thank you very much for your support

View solution in original post

IIRHO.1 · ‎2023-08-03

Hello @JPablo1 and welcome to ST Community.

I suggest you to change the pin of boot and try again.

Best Regards.

Issam

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JPablo1 · ‎2023-08-03

Hi, I managed to make it work again, here is what happened:

I used CubeProgrammer to access the flah memory, and even though it showed an error on the read operation, it allowed me to perform a full chip erase. After doing that I was able to upload my code to the board again, however, the radio part was not working. I realised that the board was restarting "randomly" and eventually I figured out that it was just after sending data via LoRa. Actually the MCU was generating a reset jus after entering stop2 mode, which was entered after sending a radio packet, so it was indeed sendig data but could´t receve the response because the reset generated when it was supposed to enter low power mode. To solve that I changed the state of the flash option byte nRST_STOP which precisely makes the either MCU restart or keep running when entering low power mode.
That's how I worked around this issue and it has been working ok since then. I suppose the flash content got corrupted but I don't know what the cause might have been.

Thank you very much for your support