HELP! Cannot get NUCLEO-C031C6 to communicate on serial port

Are you using the Virtual Com Port of the ST-Link? Or some USB to Serial adapter on PB6 and PB7?

If you're using the VCP and you are using the default setup of the Nucleo board, then you need to fix the UART peripheral as it is wrong. From the schematics the VCP uses USART2 on PA2 and PA3. USART1 is incorrect.

Hello @CBarb.1​ ,

As @Community member​  said, by default the VCP of the STLINK is connected on PA2 or PA3. I saw on your IOC file that you selected PB7 and PB6 as VCP.

So you there are two solutions to have the VCP working either you can change the serial port from USART1 with PB6 and PB7 to USART2 with PA2 and PA3 or you can unsolder the SB27/SB32 and solder the SB31/SB33 following the NUCLEO schematic page 3 (https://www.st.com/resource/en/schematic_pack/mb1717-c031c6-b02_schematic.pdf)

Best regards,

Simon

I can't believe that I did not notice such a blatant error. I guess that is what happens when you rely on the default set-up of the peripherals of the Nucleo board. I just reconfigured the serial port to USART2 and now everything works!!

Once again thank you all for your help

While I am on a similar subject, one thing I noticed is that if I set the Use Float with printf on the project properties for the C/C++ build I get errors in compilation with this MCU?? It does show that there is no FPU, so how do you get to do a printf to print a float value??

In this code, the STM32C0316-DK works with STLinkV3minie VCP xor Serial to Bluetooth HC-06 dongle.

SIF.C or BTEL_drivers.C are the entry point files to dig.

STM32C03 has only 2 uart, so check carefully the schematics and jumper/solder bridges to make sure nothing else electrically prevent the STM32C0 to STLinkVCP communication.