关于RS232串口通信想请教下

只看该作者 · 2019-11-17 14:10

之前用PIC单片机232通信思想就是上位机发送一组数据，下位机接收这组数据放入缓冲区，然后分析接收到的数据进行其他的操作处理，现在刚学STM32也想这样来做。做个简单的协议，上位机发送协议来点亮LED，可是程序不是按照我的协议来的，无论上位机发什么数据LED灯都可以被点亮，求大神指导下。代码如下、/**
******************************************************************************
  * @brief  USART1 GPIO 配置,工作模式配置。9600 8-N-1
  * @param  无
  * @retval 无
******************************************************************************
  */
void USART1_Config(void)
{
      GPIO_InitTypeDef GPIO_InitStructure;
      USART_InitTypeDef USART_InitStructure;

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

      /* USART1 GPIO config */
      /* Configure USART1 Tx (PA.09) as alternate function push-pull */
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_Init(GPIOA, &GPIO_InitStructure);
      /* Configure USART1 Rx (PA.10) as input floating */
      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
      GPIO_Init(GPIOA, &GPIO_InitStructure);

      /* USART1 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(USART1, &USART_InitStructure);

      /* 使能串口1接收中断 */
      USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);


      USART_Cmd(USART1, ENABLE);
      USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);
  //USART_ITConfig(USART1, USART_IT_TC, ENABLE);
      USART_ClearFlag(USART1,USART_FLAG_TC);
}

/**
******************************************************************************
  * @brief  配置USART1接收中断
  * @param  无
  * @retval 无
******************************************************************************
  */

void NVIC_Configuration(void)
{
      NVIC_InitTypeDef NVIC_InitStructure;
      /* Configure the NVIC Preemption Priority Bits */
      NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);

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

/**
  * @brief  串口1处理函数
  * @param  None
  * @retval None
  */
void USART1_IRQHandler(void)
{

      if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
      {
            USART_ClearITPendingBit(USART1, USART_IT_RXNE);  //清除中断标志
            recv_buff[recv_pt] = USART_ReceiveData(USART1);
            recv_pt++;
            recv_pt&=0xff;//最多255个字节
            if((recv_buff[0]=0x05)&&(recv_buff[5]=0x03))recv_ok=1;

            //溢出-如果发生溢出需要先读SR,再读DR寄存器则可清除不断入中断的问题
if(USART_GetFlagStatus(USART1,USART_FLAG_ORE)==SET)
{
   USART_ClearFlag(USART1,USART_FLAG_ORE); //读SR其实就是清除标志
   USART_ReceiveData(USART1); //读DR
}

      }

}

//接收上位机数据点亮LED
void comm_debug(void)
{

      if(recv_ok==1){LED1(ON);recv_ok=0;recv_pt=0;}
}

int main(void)
{
      /* LED 端口初始化 */
      LED_GPIO_Config();
/*按键初始化*/
  Key_GPIO_Config();
      /* 配置SysTick 为10us中断一次 */
      SysTick_Init();
      /* USART1 配置模式为 115200 8-N-1，中断接收 */
      USART1_Config();
      /*中断源配置*/
      NVIC_Configuration();

//USART_SendData(USART1, USART_ReceiveData(USART1));

      while(1)
      {

            comm_debug();


  }
}

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