How to program empty STM32f042C4U6 from UART1 instead of SWCLK-SWDIO?

[MehmetKaya]

 Is it possible to program an empty STM32F042 using UART1 instead of SWCLK-SWDIO?

I want to flash programming of STM32F042 which is zero. 

[TDK]

If you hold BOOT0 high during reset, it will boot into the bootloader. You can then use UART to program it.

STM32CubeProgrammer can do this for you if you have a USB to UART adapter and hook it up to the correct pins. See AN2606 for supported pinout.

cd00167594-stm32-microcontroller-system-memory-boot-mode-stmicroelectronics.pdf

UART bootloader protocol is detailed here:

cd00264342-usart-protocol-used-in-the-stm32-bootloader-stmicroelectronics.pdf

[MehmetKaya]

If I do BOOT0 high (always pulled up) and connect USB to UART adapter TX-RX to STM32f042C4U6 as picture, May I program all flash with STM32CubeProgrammer?

[Tesla DeLorean]

BOOT0 will need to be Low for normal operation once programmed.

[MehmetKaya]

Ok, so when programming from UART BOOT0 must be high, after programming we have to do low BOOT0 for normal operation, right?

[TDK · Accepted solution]

Yes