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bkdi
bkdi
Associate II
March 11, 2014
Question

STM32F4-DISCOVERY LD8 lights whole time

  • March 11, 2014
  • 2 replies
  • 951 views
Posted on March 11, 2014 at 02:34

LD8 LED is ON (USB over-current) regardless to program. Furthermore receiving data by UART3 using pin PC11 is impossible, but with PD9 works fine. Earlier 

I had no

problems

, and now

after connected the

board

to the computer

is something wrong. Please tell me what  can cause problems.

Thank you

    This topic has been closed for replies.

    2 replies

    Amel NASRI
    Amel NASRI
    ST Technical Moderator
    March 11, 2014
    Posted on March 11, 2014 at 09:24

    - Did you bring any hardware update to the board?

    - Earlier

    I had no

    problems

         Do you mean before connecting USB?

         Could you share minimum helpful code to understand issue? (May be you forgot to enable clock)

    -Mayla

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    bkdi
    bkdiAuthor
    Associate II
    March 11, 2014
    Posted on March 11, 2014 at 19:56

    I have worked on the program, that received data from UART3 and sended it by USB OTG to PC. It worked fine for a few weeks. Before the last connection to PC by CN1, when I saw, that pin PC11 was damaged (reception don't work) and LD8 is on, I had updated the ST-Link firmware to 2.19. After update I worked with my board for some hours. When I connected the Discovery to PC next day, there was  problem described above.

    I think this is hardware problem (not in my code), because LD8 lights even if I clean flash memory using STM32 ST-Link Utility, but maybe there is some solution?

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