I just finished assembling my first BlueSaab 6.1 board, and I'm not sure if the board is functioning correctly. Currently, I only get a solid red power LED, a solid green LED on the board, and an error stating that there is no response from the target when I attempt to flash it from Windows.
The only change I made from the provided BOM was swapping the STM32F103RBT7 for an STM32F103RBT6 that I removed from an STM Nucleo board due to the chip shortage.
I am not sure if the issue would be related to the microchip itself or another problem on the board.
I don't thing swap of STM32 could prevent it from working.
Did you follow the STM32 programming process ? You need to put chip into upload mode to accept incoming comms from progamming tool. Here are the steps :
1. Press and hold BOOT0 button
2. While holding BOOT0, press and release RESET button
3. Release BOOT0 button
Now STM32 should be in DFU mode and accept firmware over UART1.