USART3 发送不出去，接受的时候也不进中断

crossok

在USART3上面实验个自发自收的程序，都不通，有什么地方配置不对吗
//********************************************************************************  
void uart_init(void)
{
GPIO_InitTypeDef   GPIO_InitStructure;
USART_InitTypeDef  UART_InitStructure;
NVIC_InitTypeDef   NVIC_InitStructure;

// activate UART3
USART_DeInit(USART3);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);

// activate GPIOB (UART3-Pins)
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);

// assign UART3-Pins (PB10 and PB11)
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Pin   = GPIO_Pin_10;
GPIO_Init(GPIOB, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Pin  = GPIO_Pin_11;
GPIO_Init(GPIOB, &GPIO_InitStructure);

// configure UART3
UART_InitStructure.USART_BaudRate            = 9600;
UART_InitStructure.USART_WordLength          = USART_WordLength_8b;
UART_InitStructure.USART_StopBits            = USART_StopBits_1;
UART_InitStructure.USART_Parity              = USART_Parity_No ;
    UART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
UART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;  
USART_Init(USART3, &UART_InitStructure);

// activate s32errupt for UART3
NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

USART_ITConfig(USART3,USART_IT_RXNE,ENABLE);

USART_Cmd(USART3, ENABLE);

USART_SendData(USART3, 0x12) ;        //test
}

//********************************************************************************  
void USART3_IRQHandler(void)
{
u8 Res;
if(USART_GetITStatus(USART3, USART_IT_RXNE) != RESET) 
{
Res =USART_ReceiveData(USART3);
USART_SendData(USART3, Res);
}
}

溫柔一刀

我的 UART3 用到PORTC PIN-10 PIN-11 , 若你是用到 PORTB ? 可能要更改腳位切換的功能

我是使用 F207 不過都大同小異

void debug_port_init(void){
      USART_InitTypeDef USART_InitStructure;
    GPIO_InitTypeDef GPIO_InitStructure;
    /* USARTx configured as follow:
        - BaudRate = 115200 baud  
        - Word Length = 8 Bits
        - One Stop Bit
        - No parity
        - Hardware flow control disabled (RTS and CTS signals)
        - Receive and transmit enabled
      */
    //
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
      /* Connect PXx to USARTx_Tx*/
      GPIO_PinAFConfig(GPIOC, GPIO_PinSource10,GPIO_AF_USART3);
      /* Connect PXx to USARTx_Rx*/
      GPIO_PinAFConfig(GPIOC, GPIO_PinSource11,GPIO_AF_USART3);    
      /* Configure USART Tx as alternate function  */
      GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
      GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_Init(GPIOC, &GPIO_InitStructure);

      /* Configure USART Rx as alternate function  */
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
      GPIO_Init(GPIOC, &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 configuration */
     USART_Init(USART3, &USART_InitStructure);
    
      /* Enable USART */
      USART_Cmd(USART3, ENABLE);    
    debug("\r\n\r\n");
}