Hi, where can I find information about how to program an STM32 through the SWD interface? My objective is to program one stm32g0 through the SWD port without using a PC

[Tesla DeLorean]

ARM has manuals describing the protocol.

Things like OpenOCD or Black Magc probe perhaps software implementation.

Basically these will push loaders into RAM along with data blocks​, and use normal FLASH programming code to erase and write.

[Javier1]

If i understood correctly you want to do your own STLINK (stm32f03c8t6 chip)

https://community.st.com/s/question/0D53W00000tqUmYSAU/how-to-swd-serial-wire-as-a-masterhost-from-stm32