基于STM32在IAR中调用printf()函数

在主文件main.c中添加如下代码：

#ifdef __GNUC__

#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)

#else

#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)

#endif

PUTCHAR_PROTOTYPE

{

USART_SendData(EVAL_COM1, (uint8_t) ch);

while (USART_GetFlagStatus(EVAL_COM1, USART_FLAG_TC) == RESET)

{}

return ch;

}

#ifdef USE_FULL_ASSERT

若变异出现错误:

identifier "FILE" is undefined

则选中工程，将Options->GeneralOptions->Library Configuation中的Library选为full即可