MSP430F149 MCU implements uart data receiving interrupt

/********************************************************
Program function: MCU keeps sending data to PC and the corresponding
          ASCII characters of 0~127 are displayed on the screen
------------------------------------------------------
Communication format: N.8.1, 9600
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Test description: Open the serial port debugging wizard, set the communication format correctly, and observe the screen
******************************************************/


#include


typedef unsigned char uchar;
typedef unsigned int uint;


extern void Delays(void);
extern uchar GetChar(void);
extern void PutChar(uchar c);
extern void PutString(uchar *ptr);
extern void InitUART(void);


static uchar pstr = 'A';


/************************Main function**********************/
void main(void)
{
    uchar *tishi = " MCU sends 0~127 to PC and the\
                    \n screen will display their corresponding\
                    \n ASCII code as follows:";
    uchar value = 0;
    //uchar c;
    int i = 10;
    int j = 100;
    
    WDTCTL = WDTPW + WDTHOLD; // 关狗
    
    InitUART();
    _EINT(); //Enable global interruptwhile
    
    (i--)
    {    
        while (!(IFG1 & UTXIFG0));
        TXBUF0 = value++;
        value &= 0x7f; // Ensure that value is less than 128
        while (!(IFG1 & UTXIFG0));
        TXBUF0 = '\n';
        Delays();
    }
    
    PutString(tishi);


    while(j--)
    {
        PutChar(pstr);    
        //if(IFG1 & URXIFG0) //If a character is received
          //c = RXBUF0;
        //PutChar(c);        
        Delays();   
    }
 
    while(1)
    {
        Delays();            
    }
}

#include


typedef unsigned char uchar;
typedef unsigned int uint;


void Delays(void);
uchar GetChar(void);
void PutChar(uchar c);
void PutString(uchar *ptr);
void InitUART(void);




/*******************************************
Function name: GetChar
Function: Send character to the development board
Parameter: None
Return value: char
********************************************/
uchar GetChar(void)
{
      uchar c;
      
      while(URXIFG0 == 1);
      c = RXBUF0;
      
      return c; //Send the received character 
}


/***********************************************
Function name: PutChar
Function: Send character to the development board
Parameter: uchar
Return value: None
**************************************************/
void PutChar(uchar c)
{
      while (!(IFG1 & UTXIFG0));
      TXBUF0 = c; //Send the received characters 
}


/***********************************************
Function name: PutStingFunction
: Send string to PCParameter
: NoneReturn
value: None
********************************************/
void PutString(uchar *ptr)
{
      while(*ptr != '\0')
      {
            while (!(IFG1 & UTXIFG0)); // Is TX buffer free?
            TXBUF0 = *ptr++; // Send data
      }
      while (!(IFG1 & UTXIFG0));
      TXBUF0 = '\n';
}
/*******************************************
Function name: Delays
Function: Delay for a while
Parameters: None
Return value: None
********************************************/
void Delays(void)
{
    uchar i=20;
    uint j;


    while(i--)
    {
            j=2000;
            while(j--);
    }
}
/*******************************************
Function name: InitUART
Function: Initialize UART port
Parameters: None
Return value: None
********************************************/
void InitUART(void)
{
    P3SEL |= 0x30; // P3.4,5 = USART0 TXD/RXD
    ME1 |= URXE0 + UTXE0; // Enable USART0 T/RXD
    UCTL0 |= CHAR; // 8-bit character
    UTCTL0 |= SSEL0; // UCLK = ACLK
    UBR00 = 0x03; // 32k/9600 - 3.41
    UBR10 = 0x00; //
    UMCTL0 = 0x4A; // Modulation
    UCTL0 &= ~SWRST; // Initialize USART state machine
    IE1 |= URXIE0; // Enable receive interrupt of USART0
}

#pragma vector=UART0RX_VECTOR
__interrupt void UART0_RXISR(void)
{
    uchar *Pstring = " Receive Data :";
    pstr = RXBUF0;
    PutString(Pstring);
    PutChar(pstr);

}

The serial port debugging assistant displays the following: