有关STM32F107的USART3的配置，总是实现不了正常通信，麻烦哪位大神帮忙看一下，是不是哪没配置对？着急，在线等，谢谢。。。

cc57822

/****************************************以下是串口3的配置***********************************************/
   
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE); 
  
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE);
    /*
    *  USART3_RX -> PB10 , USART3_TX -> B11
    */    
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;       
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;        
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &GPIO_InitStructure);

    USART_InitStructure.USART_BaudRate = 19200;
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;
    USART_InitStructure.USART_StopBits = USART_StopBits_1;
    USART_InitStructure.USART_Parity = USART_Parity_No;
    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_ClearITPendingBit(USART3, USART_IT_TC);//清除中断TC位 

Fliger

根据原子哥uart1改的 能用printf和上位机通讯了，或者你把你工程发上来 我帮你看看 我也菜鸟 不一定能帮到你  但是你发上来 大神看到可能会帮到你

正点原子

帮顶....

Fliger

中断函数呢，主函数呢？发个工程上来看看，我做过uart3 
 不过是寄存器版本的，需要可以发给你

cc57822

回复【3楼】Fliger:
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这是优先级配置
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;

 /****************************以下为串口1的中断初始化*****************************/


NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
// NVIC_InitStructure.NVIC_IRQChannel = CAN2_RX0_IRQn;
// NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
// NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
// NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
// NVIC_Init(&NVIC_InitStructure);

//NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);  
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;   
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);


   NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;   
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

   NVIC_InitStructure.NVIC_IRQChannel = UART4_IRQn;   
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 4;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);


NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;   
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 5;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

   NVIC_InitStructure.NVIC_IRQChannel = UART5_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 6;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

}

这是串口3的发发送函数

void UART3_Send_Data(unsigned char *send_buff,unsigned int length)
{
  unsigned int i = 0;
 for(i = 0;i < length;i ++)
    {   
     USART3->DR = send_buff;
     while((USART3->SR&0X40)==0); 
    }
}

这个是中断函数

void USART3_IRQHandler(void) 
{
 INT8U err;
 OS_CPU_SR cpu_sr;
 OS_ENTER_CRITICAL();    // 关中断                              
    OSIntNesting++;      //中断嵌套层数，通知ucos
    OS_EXIT_CRITICAL();     //开中断
 if(USART_GetITStatus(USART3, USART_IT_RXNE) != RESET)//接收到了数据
 { 
  M1_buff2[M1_rec_counter2] = USART3->DR;
  M1_rec_counter2 ++;
  if(M1_buff2[0] != 0x02)
   RS485_rec_counter = 0;

   。。。。。。。。。。。。

  。。。。。。。。。。。。

if(M1_rec_counter2 > M1_REC_BUFF_SIZE)//超过接收缓冲区大小
      {
//   if(M1_Search_flag == 6)
//    ERRORNUM ++;
      M1_rec_counter = 0;
      }
  }
 if (USART_GetITStatus(USART3, USART_IT_TXE) != RESET)
 {
        USART_ClearITPendingBit(USART3, USART_IT_TXE);           /* Clear the USART transmit interrupt                  */
  }
 OSIntExit();//中断退出，通知ucos
}

cc57822

回复【3楼】Fliger:
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鲁蠱

被多串口调试忙的焦头烂额啊

cc57822

回复【6楼】Fliger:
---------------------------------
谢谢你，我今天在现场蹲了一下午，在那仿真测试，最后终于解决了。呵呵。。。总算辛苦没白费，呵呵。。。