Programming with USB C and communication via UART

[Zero-96]

Good morning everyone!

I have a question regarding a USB to UART IC. I’ve seen that the FT231XQ is used in ESP32s to program and communicate via UART. Is it possible to do the same with STM32s?

 

[Andrew Neil]

Yes.

In this case, all the STM32 sees is a UART connection - it neither knows nor cares whether that came via USB, or from a Real RS232 port, or from anything else.

So, as far as the STM32 is concerned, the FT231XQ (or whatever) is irrelevant - it's all just UART comms.

The built-in UART Bootloader is described in Application Note AN3155, USART protocol used in the STM32 bootloader:

https://www.st.com/resource/en/application_note/an3155-usart-protocol-used-in-the-stm32-bootloader-stmicroelectronics.pdf

 

You can also write your own custom bootloader - see, for example Application Note AN4657 STM32 in-application programming (IAP) using the USART:

https://www.st.com/resource/en/application_note/an4657-stm32-inapplication-programming-iap-using-the-usart-stmicroelectronics.pdf

[Zero-96]

Okay, for Uart it will be possible, but to upload programs to the MCU, will it be possible?

[Andrew Neil]

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@Zero-96 wrote:

Okay, for Uart it will be possible, but to upload programs to the MCU, will it be possible?

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I don't understand - I just answered exactly that question!