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STM32F4 USB FS and PA8 as output not working

Question asked by VDM on May 17, 2017
Latest reply on Jun 15, 2017 by VDM

Hi,

 

I'm using the STM32F446ZE.

 

I'm using PA11 and PA12 for USB FS DM and DP, but I don't need PA8 as SOF, I need it as a simple output.

 

USB is runing fine only if PA8 = 0 !

If I set PA8 output to 1, the USB disconnects.

 

It looks like the PA8 is in Alternate function mode, but after double-check, the PA8 mode is in Output mode ( MODER8 = 1, AFR8 = 0 ).

 

Did someone already faced this issue ?

Thanks and best regards,

Vincent.

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