Hy,
as described and discussed earlier (https://community.st.com/s/question/0D50X00009sWdDqSAK/stm32f042-bootloader-activation) I want to use bootloader mode of STM32F042 to update STM32 firmware in a multi CPU system. I still see this way as very elegant because I do not need to maintain yet another piece of code and it seems quite fail-safe to me.
During implementation on a NUCLEO-F042K6 I run into problems.
To be able to activate bootloader mode on the Nucleo, I solder a wire to SB12 and conect it to "BOOT" output pin of host CPU.
Also I remove SB3 and connect lower pin to TX pin of host CPU
Also I solder a wire to Pin 24 of STM and connect this to RX of host CPU.
When then asserting the boot sequence (NRST = Low, BOOT = High, NRST = High, Send 0x7F over UART) I do not see a response on RX.
What might be the root cause? Has anyone ever tried to use bootloader with a Nucleo?
Best regards
Harald
