Posted on June 21, 2018 at 16:43STM32479I EVAL board? or something else?
Configure the USART/pins associated with the ST-LINK VCP, check schematic and/or manual
https://www.st.com/en/evaluation-tools/stm32479i-eval.html
Some implementations use syscalls.c, and provide the __io_putchar() function
#ifdef __GNUC__
/* With GCC, small printf (option LD Linker->Libraries->Small printf
set to 'Yes') calls __io_putchar() */
#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
#else
#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
#endif /* __GNUC__ */
/**
* @brief Retargets the C library printf function to the USART.
* @param None
* @retval None
*/
PUTCHAR_PROTOTYPE
{
/* Place your implementation of fputc here */
/* e.g. write a character to the EVAL_COM1 and Loop until the end of transmission */
HAL_UART_Transmit(&UART_Handle, (uint8_t *)&ch, 1, 0xFFFF);
return ch;
}
Or use ITM_SendChar(ch) to get out of the SWV via PB3/SWO
