stm32 IAR环境printf函数调用

#include

#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;
}

#ifdefUSE_FULL_ASSERT

之后如若编译出现identifier "FILE" is undefined，即将Options->GeneralOptions->Library Configuation中的Library选为full即可