MSP430F449单片机RS232接口C程序：

＃i nclude "msp430x44x.h"
void init_uart(void);
void uart_start(void);
void uart_send(void);
void uart_receive(void);
unsigned char RXDATA_BUF[10],TXDATA_BUF[10]={0xbd,0x77,0x3d,0xc5,0xc6,0xf5,0x68,0x0d,0x6b,0xff};
unsigned int RX_count=0,TX_count=0,TXBUF_num=10,RXBUT_num=10,FLAG;
void main(void)
{   init_uart();
    uart_start();
    while(1)
    {_BIS_SR(CPUOFF);
    _NOP();
    }
}

void init_uart(void)                    //初始化UART
{   unsigned int i;
    WDTCTL=WDTPW+WDTHOLD;
    FLL_CTL1|=XT2OFF+SELM_XT2+SELS;     //选择MCLK时钟源
    do                                  //等待时钟稳定
    {   IFG1&=~OFIFG;
        for(i=0;i<0xff;i++);
    }while((FLL_CTL0&XT2OF)==XT2OF);
    UCTL0|=SWRST;                       //控制寄存器位
    UCTL0|=CHAR;
    UTCTL0=SSEL0+SSEL1;                 //选择发送时钟源复位
    UBR00=0XA0;                         //波特率9600
    UBR10=0X01;
    UMCTL0=0X5E;
    UCTL0&=~SWRST;                      //选择发送时钟源置位
    ME1|=URXE0+UTXE0;                   //使能TXD  RXD
    IE1|=URXIE0;
    IFG1=0X00;
    P2SEL|=0X30;                        //模块选用
    P2DIR|=0X10;
    for(i=0;i<10;i++) {RXDATA_BUF[i]=0;}//清接收缓存
    _EINT();
}
void uart_start(void)                   //启动发送
{   IE1|=UTXIE0;
    while((UTCTL0&BIT0)!=BIT0);
    TXBUF0=TXDATA_BUF[0];
    TX_count=1;
}
void uart_receive(void)                 //接收
{   RXDATA_BUF[RX_count]=RXBUF0;
    RX_count+=1;
    if(RX_count>=RXBUT_num) {RX_count=0;}
}
void uart_send(void)                    //发送
{   TXBUF_num-=1;
    if(TXBUF_num>0)
      {   TXBUF0=TXDATA_BUF[TX_count];
          TX_count+=1;
         
      }
    else
     {   FLAG+=1;
        if(FLAG>10)  {IE1&=~UTXIE0;}
              else  {   TXBUF_num=10;
                        TX_count=0;
                        uart_start();
                     }
      
     }
}
interrupt [UART0TX_VECTOR] void uart_tx(void)//发送中断响应
{   
    uart_send();
}
interrupt [UART0RX_VECTOR] void uart_rx(void)//接收中断响应
{
    uart_receive();

}