msp430-rs232.c

msp430-rs232调试程序

#include<msp430x14x.h>
#define TXD BIT4 //P3.4
#define RXD BIT5 //P3.5
/**************************************************/
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)
{  WDTCTL=WDTPW+WDTHOLD;
    init_uart();
    uart_start();
    while(1)
    {_BIS_SR(CPUOFF);
    _NOP();
    }
}
/**************************************************/
void init_uart(void)                  
{ unsigned int i;
  P3SEL |= TXD+RXD;                         // P3.4,5 = USART0 TXD/RXD
  P3DIR |= TXD;  

  UCTL0|=SWRST;
  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
  ME1 |= UTXE0 + URXE0;                     // Enable USART0 TXD/RXD
  IE1 |= URXIE0 + UTXIE0;                          // Enable USART0 RX interrupt
  IFG1=0X00;
  for(i=0;i<10;i++) 
  {RXDATA_BUF[i]=0;}                        // Clear RXDATA_BUF[i]
  _EINT();

}
/**************************************************/
void uart_start(void)                      
{   IE1|=UTXIE0;
    while((UTCTL0&SWRST)!=SWRST);
    TXBUF0=TXDATA_BUF[0];
    TX_count=1;
}
/**************************************************/
void uart_receive(void)                 //receive
{   RXDATA_BUF[RX_count]=RXBUF0;
    RX_count+=1;
    if(RX_count>=RXBUT_num) 
   {RX_count=0;}
}
/**************************************************/
void uart_send(void)                    //send
{   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();
                     }

     }
}
/**************************************************/
#pragma vector=UART0TX_VECTOR
__interrupt void usart0_tx (void)
{   
    uart_send();
}
#pragma vector=UART0RX_VECTOR
__interrupt void uart_rx (void)
{
    uart_receive();
}
/********************END***************************/