STM32F4-DISCOVERY LD8 lights whole time

bkdi · ‎2014-03-10

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

Amel NASRI · ‎2014-03-11

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 · ‎2014-03-11

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?