STM32F407 discovery board: USB and I2C issue

[Jimmy_LEE]

Is there anyone who experience this issue?

I use eeprom with I2C and USB OTG communication in STM32F407 discovery board. There is no common GPIO pin.

whenever I use USB OTG to write something in eeprom through I2C, USB and I2C looks disabled in same time. 

I googled it and found there are similar issue but no solution at all.

is there any solution?

[Andrew Neil]

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@Jimmy_LEE wrote:

USB and I2C looks disabled in same time. 

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What do you mean by that?

What investigation/debugging have you done to find out what's going on ?

[Muhammed Güler]

Are you sure there is no problem with interrupt management?
I felt that you were trying to perform long operations within the interrupt without seeing your code.

[FBL]

Hi @Jimmy_LEE 

Would you provide a minimum example to replicate this issue? you can check if it's applicable on specific I2C / OTG instance?

[Jimmy_LEE]

literally looks all function stop. No usb communication response to PC and no I2C response.

I have debugged them but I have no idea about this issue...

[Jimmy_LEE]

I think there is no problem with interrupt management. This is really weird. I have checked I2C interrupt couple of times..

[Andrew Neil]

You've marked this as solved - but it doesn't seem to be?

See this to un-mark a solution:

https://community.st.com/t5/stm32-mcus-embedded-software/sd-card-no-file-system-error/m-p/641422/highlight/true#M45514