Programming the STM32G030F through serial interface

[RickH]

Greetings,

I've always programmed MCU's using USB connector (e.g., on Nucleo boards) or through JTAG (for custom boards).  We are considering STM32G030Fx (TSSOP20 package) for sensor control - however, I need to figure out how to program the chip.  From what I've read, I need to assert BOOT0, then use either I2C or UART to make the physical connection to the board; UART is my preferred interface.

I imagine I would hook an FTDI board between my computer (i.e., USB) and the MCU UART TX/RX pins.  What then?  Select ST-Link in CubeIDE with SWD.  Anything else? Is there a cheat-sheet available that describes the process?

Any help would be greatly appreciated!  Thanks much!! Rick

[TDK]

Assuming you are in the bootloader (hold BOOT0 high during reset), you can program over UART using STM32CubeProgrammer. Select UART instead of ST-LINK. You could create an External Tools script to program the chip this way from within CubeIDE. I don't think CubeIDE has native UART/I2C programming capability.

See AN2606 for supported bootloader pins.

https://www.st.com/resource/en/application_note/an2606-stm32-microcontroller-system-memory-boot-mode-stmicroelectronics.pdf

And AN3155 for the UART protocol.

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

That being said, developing on a board without a debug interface is slow going and frustrating. Better idea would be to create a dev board with the debug interface and remove it after the firmware is complete.