stm32f103串口UART4和UART5怎么配置

2万 · 2021-10-10 15:06

stm32f103vct6的异步串口UART4和UART5，如下配置貌似只能发数据，不能收数据，连UART4_IRQHandler都进不去，求大神指点一二：
void drv_BT_UartInit(void){
      GPIO_InitTypeDef GPIO_InitStructure;
      USART_InitTypeDef USART_InitStructure;

      /* config USART1 clock */
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE);

      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC,ENABLE);
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
      RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART4,ENABLE); //注意UART4是挂载在APB1总线上的，用          RCC_APB1PeriphClockCmd()函数初始化！

      //configˉUART4-TX-PC10
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_Init(GPIOC, &GPIO_InitStructure);
      //UART-RX-PC11
      GPIO_InitStructure.GPIO_Pin=GPIO_Pin_11;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;

      USART_InitStructure.USART_BaudRate = 57600;
      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;

      NVIC_SetPriority(UART4_IRQn,PRIORITY_UART4);
      NVIC_EnableIRQ(UART4_IRQn);

   USART_DeInit(UART4);
   USART_Init(UART4, &USART_InitStructure);
   USART_Cmd(UART4, ENABLE);
   while(( UART4->SR & USART_FLAG_TC) == 0) __nop();

   USART_ITConfig(UART4,USART_IT_RXNE,DISABLE);
   hal_Uart_clear(UART4);
   USART_ITConfig(UART4,USART_IT_RXNE,ENABLE);

   USART_ClearFlag(UART4,USART_FLAG_TC);
}

注：
void hal_Uart_clear(USART_TypeDef * pUart){
volatile int val;
      if(pUart->SR & (USART_FLAG_RXNE|USART_FLAG_ORE)){
      val=pUart->DR;
}else{
         pUart->SR &= ~0x0F;
}
}