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DMårt
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September 16, 2021
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What is the default USB settings e.g baud rate, parity, stopbit, databit etc for STM32?

  • September 16, 2021
  • 6 replies
  • 1921 views

What is the default USB settings e.g baud rate, parity, stopbit, databit etc for STM32 when using USB_FS?

In this case I can only choose FULL SPEED 12 mb/s. Is that 115200 bps?

I'm using STM32F373VBTx processor

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Best answer by TDK
Then the speed you select has no effect. You can use whatever you want, it doesn't matter.

6 replies

TDK
TDK
September 16, 2021

You are mixing up USB speed with UART speed. If you implement a serial port in USB, you can have whatever defaults you want.

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DMårtAuthor
Lead
September 17, 2021

So if I have USB, without UART. Then my baud rate etc are configured by the host e.g PC computer when I connect the STM32?

Yes, my USB at STM32 works fine, but I want to slow down the speed. Can I do that from the computer?

STM32MP151AAC3 custom board with STM32-OS as operating system: https://github.com/DanielMartensson/STM32-ComputerSTM32MP257FAK3 custom board with STM64-OS as operating system: https://github.com/DanielMartensson/STM64-Computer
TDK
TDK
September 17, 2021

USB clock rate is fixed. If the PC and STM32 are connected purely through USB, you cannot change the speed.

If you are using a USB to UART adapter (such as ST-Link VCP), you can adjust the speed as needed in your terminal program.

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