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根据MDK获知IAR选择即可，把他定义在main.c的main函数前面
#if 0?? ?//IAR printf USE
#ifdef __GNUC__
#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
#else
#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
#endif
PUTCHAR_PROTOTYPE
{
HAL_UART_Transmit(&huart1 , (uint8_t *)&ch, 1, 100);
return ch;
}
#endif
#if 1 ?//MDK printf USE
#pragma import (__use_no_semihosting)
struct __FILE
{
?? ?int handle;
};
FILE __stdout;
void _sys_exit(int x)
{
?? ?x=x;
}
int fputc(int ch, FILE *f)
{
?? ?//while((USART1->SR&0x40)==0);
?? ?//USART1->DR = (uint8_t) ch;
?? ?HAL_UART_Transmit(&huart1 , (uint8_t *)&ch, 1, 100);
?? ?return ch;
}
#endif
?
如果用错有可能出现程序不运行的情况，debug要点几次才运行的情况
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