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STM32 MCU to use CAN and USB simultaneously

kavinkumar
Associate III

‎2025-07-30 11:20 AM

Hi there 
Is there any stm32 MCU versions that has can run both CAN and USB simultaneously without conflicting with the PB8 boot pin? Also the USB will only be recognized if the PB8 pin is pulled high can i just directly connect it to 3.3v and always keep it on. will that be a problem 

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12 REPLIES 12
kavinkumar
Associate III
In response to Karl Yamashita

‎2025-07-30 12:56 PM

Yeah i tried USB CDC in STM32G4 it worked but still i need to pull the BOOT pin high while connecting the USB. is there a way i can bypass that. i just need to connect the USB to my PC and start sending/receiving messages.

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Karl Yamashita
Principal
In response to kavinkumar

‎2025-07-30 1:03 PM

No, you should not have to pull the boot pin high to get CDC to work. Something is amiss. 

If you FIFO doesn't work, then it's called GIGO.
TimerCallback tutorial! | UART and DMA Idle with multiple UART instances tutorial!

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kavinkumar
Associate III
In response to Karl Yamashita

‎2025-07-30 8:04 PM

So i don't have to do anything for USB CDC if just connect USB To my SMT32 it will show as a USB VCP?

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