2018年01月30日 | msp430f449的RS232接口程序

#include "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=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(); 
}