STM8S103 serial port interrupt reception

This article takes STM8S103F3P6 programming as an example to introduce STM8S103F3P6 serial port interrupt reception.

Computer platform: Windows 7 64-bit flagship

Compiler software: IAR

Hardware platform: STM8S103F3P6

1. The system clock is initialized to internal 16M

CLK_HSIPrescalerConfig(CLK_PRESCALER_HSIDIV1); // Clock Initialization Clock is 16M divided by 1 and 8M divided by 2

2. Initialize the serial port

  UART1_DeInit();

  UART1_Init((u32)9600, UART1_WORDLENGTH_8D, UART1_STOPBITS_1, UART1_PARITY_NO, UART1_SYNCMODE_CLOCK_DISABLE, UART1_MODE_TXRX_ENABLE);

  UART1_ITConfig(UART1_IT_RXNE_OR, ENABLE);

  UART1_Cmd(ENABLE);

  enableInterrupts(); 

3. Write the main function

void main(void)

{

  CLK_HSIPrescalerConfig(CLK_PRESCALER_HSIDIV1);

  Heat_UART1();

  enableInterrupts(); 

 /* Infinite loop */

  while (1)

  {

    if(flagpacker)

    {

      flagpacker = 0;

      for(unsigned char num = 0; num < length;num++)

        Send(Rxpacker[num]);

    }

  }

}

4. Write interrupt service function

unsigned char flagpacker; //global variable whether a data packet is completely received  

unsigned char Rxpacker[255]; //global variable complete data packet 

unsigned char length; //data length

 INTERRUPT_HANDLER(UART1_RX_IRQHandler, 18)

 {

    /* In order to detect unexpected events during development,

       it is recommended to set a breakpoint on the following instruction.

    */

 unsigned char RxBuf; //temporary receiving  

  static unsigned char RxData[255]; //Receive data buffer  

  static unsigned char count; //Serial port receives data length  

  static unsigned char rec; // Determine whether data is being received

   UART1_ClearITPendingBit(UART1_IT_RXNE);

   RxBuf = UART1_ReceiveData8();

  if(RxBuf == (0xcc)) //Frame header

  {  

    rec= 1;  

    count = 0;  

    flagpacker = 0;  

    return ;  

  }  

  if(RxBuf == (0xcd)) // End

  {  

    rec= 0;  

    //You can add a verification code here  

    length = count;

    for(unsigned char i = 0; i    {  

      Rxpacker[i] =RxData[i];  

    }  

    flagpacker = 1; // Tell the system that a complete data packet has been received   

    return ;  

  }  

  if(rec) //Judge whether it is in receiving state  

  {  

    RxData[count++] = RxBuf;  

  }    

 }