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maha1
maha1
Visitor II
July 19, 2021
Question

USB and USART1 Pin conflict

  • July 19, 2021
  • 1 reply
  • 1849 views

Hi,

Iam using STM32F078VB (LQFP100 package) for my application. I want to use both USB and USART1 as UART1(asynchrounous mode) in my application. There occurs pin conflict while using USB pins and USART1 RTS/CTS pins, So I have disabled flow control (USART1-RTS/CTS). Even then Warning symbol is shown in configurator.

So I wanted to confirm If I can use both USART1 as UART1(asynchronous mode without flow control) and USB in same application?

Or any other configuration need to be done to use USB & USART1 together. I have attached the Pin conflict image.0693W00000CzzPHQAZ.png

This topic has been closed for replies.

1 reply

Peter BENSCH
Peter BENSCH
ST Technical Moderator
July 20, 2021

The warning you see relates to the fact that you cannot use the hardware flow functions of USART1 when USB is enabled.

So if you only control USART1 with software flow, you can easily use USB at the same time.

Good luck!

/Peter

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