回复【3楼】正点原子:
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各种折腾还是不行%>_<%就是串口没有一点东西显示，
usrt.c：
void uart_init(u32 bound){
    //GPIO?????è??
    GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
//NVIC_InitTypeDef NVIC_InitStructure;
 //USART_ClockInitTypeDef USART_ClockInitStructure;
 
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_AFIO,ENABLE); //????USART3??GPIOB?±??



     //USART3_TX   B.10
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; //PB.10
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //???????ì????
    GPIO_Init(GPIOB, &GPIO_InitStructure);
   
    //USART3_RX   B.11
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//????????
    GPIO_Init(GPIOB, &GPIO_InitStructure);  

   //Usart3 NVIC ????
/*    NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//??????????3
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //×???????3
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ?¨??????
NVIC_Init(&NVIC_InitStructure); //?ù?????¨????????????VIC?????÷
*/ 
   //USART ???????è??
/*  
 USART_ClockInitStructure.USART_Clock = USART_Clock_Disable;                        // ?±????????????
  USART_ClockInitStructure.USART_CPOL = USART_CPOL_Low;                                // ?±????????
  USART_ClockInitStructure.USART_CPHA = USART_CPHA_2Edge;                                //?±????????±???????????????
  USART_ClockInitStructure.USART_LastBit = USART_LastBit_Disable;                // ×??ó???????????±??±???????SCLK??
 Configure the USART3 synchronous paramters */
//USART_ClockInit(USART3, &USART_ClockInitStructure);                                        // ?±?????????????è??

 
 

USART_InitStructure.USART_BaudRate = bound;//??°??è????9600;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//×??¤??8??????????
USART_InitStructure.USART_StopBits = USART_StopBits_1;//??????????
USART_InitStructure.USART_Parity = USART_Parity_No;//?????????é??
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//???????????÷????
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //??·?????

    USART_Init(USART3, &USART_InitStructure); //??????????
   // USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);//????????
    USART_Cmd(USART3, ENABLE);                    //???????? 
//USART_ClearFlag(USART3, USART_FLAG_TC);
//USART_ClearFlag(USART3, USART_FLAG_TXE);

}

void USART3_IRQHandler(void)                 //????3????·??????ò
{
u8 Res;
#ifdef OS_TICKS_PER_SEC   //?????±?????????¨????,???÷??????ucosII??.
OSIntEnter();    
#endif
if(USART_GetITStatus(USART3, USART_IT_RXNE) != RESET)  //????????(????????????±?????0x0d 0x0a?á??)
{
Res =USART_ReceiveData(USART3);//(USART1->DR); //????????????????

if((USART_RX_STA&0x8000)==0)//???????ê??
{
if(USART_RX_STA&0x4000)//????????0x0d
{
if(Res!=0x0a)USART_RX_STA=0;//?????í?ó,????????
else USART_RX_STA|=0x8000; //?????ê???? 
}
else //????????0X0D
{
if(Res==0x0d)USART_RX_STA|=0x4000;
else
{
USART_RX_BUF[USART_RX_STA&0X3FFF]=Res ;
USART_RX_STA++;
if(USART_RX_STA>(USART_REC_LEN-1))USART_RX_STA=0;//?????????í?ó,????????????   
}  
}
}     
     } 
我直接在main.c开头加了一句USART_SendData(USART3, 0x01);
如下：
while(1)
{//printf(" ????STM32??·?°? ???????é ")??????  
USART_SendData(USART3, 0x01);
if(USART_RX_STA&0x8000)  //???????ê??
{    
len=USART_RX_STA&0x3f;//?????????????????????¤??
printf(" ?ú·???????????: ");
for(t=0;t<len;t++)
{
USART_SendData(USART3, USART_RX_BUF[t]);//?ò????3·???????
while(USART_GetFlagStatus(USART3,USART_FLAG_TC)!=SET);//????·????á??
        if(times%30==0)
LED0=!LED0;
      }
printf(" ");//????????
USART_RX_STA=0;
}
else
{
times++;
if(times%5000==0)
{
printf(" ????STM32??·?°? ???????é ");
printf("??????×?@ALIENTEK ");
}
if(times%200==0)
printf("??????????,???????ü?á?? ");  
//if(times%30==0)
//LED0=!LED0;//????LED,?á??????????????.
delay_ms(10);   
}
}  
 }

还是没有任何的显示任何的反应，单步调试在主函数每次都是跳到执行else   time++这是为什么%>_<%%>_<%%>_<%
求站长大大帮我看看~~~