I need to write a custom bootloader to monitor USART1 and on receiving a certain command overwriting the following image into its Flash and then rebooting. Are there parts of an official ST bootloader codeset in their libraries ? Otherwise can somebody recommend which of the numerous ones on GitHub is a good place to begin. Devices that need this are STM32F103 and STM32H750. I assume with both I will set the device to execute the bootloader download code in RAM whilst overwriting the Flash. I realise I could do this easier with the JTAG port but I've had to use those pins for other functions.
Many thanks
