STM32

关于STM32F070CB中USART3的使用问题

2019-08-14 00:15发布

站内问答 / STM32/STM8
18687 1 1795
第一次整F070的片子，只用USART3中断接收数据，但是调试发现中断一直没有进，哪位大侠看看什么问题：
static void USART3_NVIC_Config(void)
{
    NVIC_InitTypeDef NVIC_InitStructure;

    /* Enable the USART3 Interrupt */
    NVIC_InitStructure.NVIC_IRQChannel = USART3_4_IRQn;         
    NVIC_InitStructure.NVIC_IRQChannelPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}


    /**
    * @brief  USART3 GPIO 配置,工作模式配置。9600 8-N-1
    * @param  无
    * @retval 无
    */
void USART3_Config(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    USART_InitTypeDef USART_InitStructure;

    /* config USART3 clock */
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE);
    /*开启GPIOB的外设时钟*/
    RCC_AHBPeriphClockCmd( RCC_AHBPeriph_GPIOB, ENABLE);
    /*配置映射外设管脚*/
    GPIO_PinAFConfig(GPIOB,GPIO_PinSource10,GPIO_AF_1);
    GPIO_PinAFConfig(GPIOB,GPIO_PinSource11,GPIO_AF_1);  
    /* USART1 GPIO config */
    /* Configure USART3 Tx (PB.10) as alternate function push-pull */
    GPIO_InitStructure.GPIO_Pin    = USART3_TX;
    GPIO_InitStructure.GPIO_Mode   = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_OType  = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_Speed  = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_PuPd   = GPIO_PuPd_NOPULL;
    GPIO_Init(GPIOB, &GPIO_InitStructure);   
    /* Configure USART3 Rx (PB.11) as input mode */
    GPIO_InitStructure.GPIO_Pin    = USART3_RX;
    GPIO_InitStructure.GPIO_Mode   = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_PuPd   = GPIO_PuPd_NOPULL;
    GPIO_Init(GPIOB, &GPIO_InitStructure);

    /* USART3 mode config */
    USART_InitStructure.USART_BaudRate = 9600;
    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);

    /* 使能串口3接收中断 */
    USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);        
    USART_Cmd(USART3, ENABLE);
    USART_ClearFlag(USART3, USART_FLAG_TC);
    USART3_NVIC_Config();
}


void USART3_4_IRQHandler(void)
{
    uint8_t UsartRes;
    //接收中断(接收到的数据必须是0x0d 0x0a结尾)
    if(USART_GetITStatus(USART3, USART_IT_RXNE) != RESET)  
    {
        UsartRes =USART_ReceiveData(USART3);//读取接收到的数据
    }
}
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1条回答
huanghan
1楼-- · 2019-08-14 01:14
本帖最后由 huanghan 于 2017-9-19 10:34 编辑

IO配置有错，给你参考
void USART_Configuration(void)
{                                                                                                
  GPIO_InitTypeDef GPIO_InitStructure;
  USART_InitTypeDef USART_InitStructure;

  RCC_AHB1PeriphClockCmd(Open407V_USART_TX_GPIO_CLK,ENABLE);
  RCC_AHB1PeriphClockCmd(Open407V_USART_RX_GPIO_CLK,ENABLE);

  RCC_APB2PeriphClockCmd(Open407V_USART_CLK,ENABLE);


  GPIO_PinAFConfig(Open407V_USART_TX_GPIO_PORT, Open407V_USART_TX_SOURCE, Open407V_USART_TX_AF);
  GPIO_PinAFConfig(Open407V_USART_RX_GPIO_PORT, Open407V_USART_RX_SOURCE, Open407V_USART_RX_AF);

  /*
  *  Open407V_USART_TX -> PA9 , Open407V_USART_RX -PA10
  */
  GPIO_InitStructure.GPIO_Pin = Open407V_USART_TX_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pin = Open407V_USART_RX_PIN;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_Init(GPIOA, &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   
*/

  USART_InitStructure.USART_BaudRate = 115200;
  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(Open407V_USART, &USART_InitStructure);
  /* Enable the Open407V_USART Transmit interrupt: this interrupt is generated when the
     Open407V_USART transmit data register is empty */
  USART_ITConfig(Open407V_USART,USART_IT_RXNE,ENABLE);

  USART_Cmd(Open407V_USART, ENABLE);
//  USART_NVIC_Config();

}
void USART_NVIC_Config(void)
{
  NVIC_InitTypeDef NVIC_InitStructure;

  /* Enable the USARTx Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}

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