launchpad msp430g2553 串口通信程序

只看该作者 · 2013-10-31 00:19

#include "msp430G2553.h"
#include "stdio.h"
int a[8],i;
void Init_uart0()
{

  UCA0CTL1|=UCSWRST;
  UCA0CTL0&=~UC7BIT;//字符长度为8
  UCA0CTL1|=UCSSEL_2;//选择系统时钟
  UCA0BR0=0x6D;  //波特率为9600
  UCA0BR1=0;
  UCA0MCTL=0;//UCA0MCTL=UCBRS0;
  IE2=UCA0RXIE+UCA0TXIE;//开接收使能
  UCA0CTL1&=~UCSWRST;
  P1SEL|=BIT1+BIT2; //将P1.1 P1.2设为第二功能
  P1SEL2|=BIT1+BIT2;
}
void Uart0Sends(char *s)
{
  while(*s!='\0')
  {
UCA0TXBUF=*s;
while((IFG2&UCA0TXIFG)==0); //查询发送是否结束
IFG2&=~UCA0TXIFG; //清除发送一标志位
s++;
  }
}
void main( )
{
  // Stop watchdog timer to prevent time out reset
  WDTCTL = WDTPW + WDTHOLD;
  BCSCTL1 = CALBC1_1MHZ;
  DCOCTL  = CALDCO_1MHZ;
  Init_uart0();
  _EINT();
  while(1)
  {
Uart0Sends("ni好");
__delay_cycles (1048576);
  }
}
#pragma vector=USCIAB0RX_VECTOR
__interrupt void usart0_rx(void)
{
  while((IFG2&UCA0RXIFG )==0);
  //a=RXBUF0;
  //i++;
  i=UCA0RXBUF;
}