NUCLEO-C092RC (MB2046B): UART-based bootloading

[Nibesh]

Hi,

I have an STM32C092RCT6U development board and I am trying to perform UART-based bootloading. My board has a B3 button for selecting the boot mode. I am using the Flash Loader Demonstrator to flash the application, but I keep getting the following error:
“No response from the target, the bootloader cannot be started.”

I also tried using STM32CubeProgrammer. I configured it for UART and attempted to connect, but the connection fails with the error:
 “Activating device: KO. Please verify the boot mode configuration and check the serial port configuration. Reset your device and try again.”

I am using a USB-to-UART module connected to PA10 (RX) and PA9 (TX) with the lines crossed (TX→RX, RX→TX).
I also tested using inbuilt Virtual COM port, However, the device is unable to communicate and does not enter the bootloader.

Could you please help me resolve this issue?

[mƎALLEm]

Hello @Nibesh 

Do you mean you are testing with NUCLEO-C092RC board?

Please refer also to this thread.

[Nibesh]

Hi @mƎALLEm ,

In my board only one pin is available for boot (i.e. BOOT0), which is having dual functionality BOOT and SWD_CLK. Even after trying the standard process for boot mode, It failed to detect the device through UART.

[mƎALLEm]

Hello,

You still didn't confirm which board are you using: NUCLEO-C092RC board? 

[Nibesh]

Hi @mƎALLEm,

I am using NUCLEO-C092RC (STM32C092RCT6U) development board (MB2046B).

[mƎALLEm]

Ok try to disconnect STLINK from the target MCU:

By removing JP4 (UM3353:(

From the board schematic:

Removing JP4 disconnects SWCLK from STM32C092. 

And you need to solder the solder bridge SB14 to connect the BOOT0 pin to CN7 connector.