---
title: STM32串口打印重定义
updated: 2022-01-11 01:27:18Z
created: 2022-01-11 01:20:11Z
tags:
  - mcu
  - printf
  - 代码块
---

STM32串口打印重定义
```c
#ifdef __GNUC__
  /* With GCC/RAISONANCE, 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 USART */
 HAL_UART_Transmit(&huart1,(uint8_t *)&ch,1,0xFFFF);
  return ch;
}
```

#mcu
#printf
#代码块