简单的STM32串口3程序

明月123 · 发表于 2018-5-21 22:06:43

战舰版STM32F1V3程序
串口3初始化
void My_Uart3_Init(){
      GPIO_InitTypeDef GPIO_InitStructure;
      USART_InitTypeDef USART_InitStructure;
      NVIC_InitTypeDef NVIC_InitStructure;
      /* config USART3 clock */
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
         RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
      GPIO_PinRemapConfig(GPIO_PartialRemap_USART3,ENABLE);
         //GPIO_PinAFConfig();
      /* USART1 GPIO config */
      /* Configure USART3 Tx (PB.10) as alternate function push-pull */
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_Init(GPIOB, &GPIO_InitStructure);
      /* Configure USART3 Rx (PB.11) as input floating */
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
      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);
      USART_Cmd(USART3, ENABLE);

      USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);

      NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;
      NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
      NVIC_Init(&NVIC_InitStructure);

}

中断程序
void USART3_IRQHandler(void){
      u16 res;
      if(USART_GetITStatus(USART3, USART_IT_RXNE)){
      res =USART_ReceiveData(USART3);
   USART_SendData(USART3,res);
}
}

主函数
int main(void)
{
   NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
   My_Uart3_Init();
   while(1);
}

将PB10和PB11与U转TTL反接
结果如图所示