STM32cube之串口printf使用

开发板：STM32F411RETX

串口输出选择PA2 PA3串口2作为打印口 

串口配置

在usart.c中，加入如下代码,huart2是cube自动生成的一个结构体变量，根据自己生成的修改

#include "stdio.h"

#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__ */
	
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(&huart2, (uint8_t *)&ch, 1, 0xFFFF); 

  return ch;
}

 输出即可：