SW4STM32C datasheet(59/99 Pages) STMICROELECTRONICS

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AN4989

Printf debugging

7.2

Printf via UART

Direct connection from PC UART to board pinout does not work due to signal level

incompatibility.

Take care to use external adapter (such as MAX232, ST3241EB, FTDI USB/UART) or the

USART connected to Virtual-COM port.

Trick:

Appendix B: Use Nucleo “cutted” ST-LINK as stand-alone VCP on page 89

explains how to use ST-LINK Nucleo stand-alone part as VCP.

The straight-forward way to set a Serial Com port with PC host is to use the USART

connected to VCP.

USART connected to VCP depends on the hardware kit:

•

Nucleo-32/Nucleo-64: USART2 - PA2/PA3

•

Nucleo-144: USART3 - PA9/PA10

•

Discovery: not standard. Refer to the board schematics

•

EVAL: not standard. Refer to the board schematics. Either the VCP or the RS232

connector can be used

In STM32CubeMX, for Nucleo board, the VCP USART pins (PA2/PA3) are reserved by

default, but required to be enabled by selecting “asynchronous” in USART mode selection

box as shown in Figure 40.

Figure 40. USART Pinout configuration with STM32CubeMX

Then, set the UART communication settings in Configuration -> USART2 Configuration

-> Parameter Settings as shown in Figure 41.

SW4STM32C Datasheet(PDF) 59 Page - STMicroelectronics