本人初学单片机，希望各位大神帮忙看一下程序

只看该作者 · 2017-7-16 13:27

#include  "msp430g2553.h"

void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                // Stop WDT

  BCSCTL1 = CALBC1_1MHZ;                   // Set DCO
  DCOCTL = CALDCO_1MHZ;

  P1SEL = BIT1 + BIT2 ;                   // P1.1 = RXD, P1.2=TXD
  P1SEL2 = BIT1 + BIT2 ;                   // P1.1 = RXD, P1.2=TXD

  UCA0CTL1 |= UCSSEL_2;                   // SMCLK
  UCA0BR0 = 104;                         // 1MHz 9600
  UCA0BR1 = 0;                            // 1MHz 9600

  UCA0MCTL = UCBRS0;                      // Modulation UCBRSx = 1
  UCA0CTL1 &= ~UCSWRST;                   // **Initialize USCI state machine**
  IE2 |= UCA0RXIE;                         // Enable USCI_A0 RX interrupt

  __bis_SR_register(LPM0_bits + GIE);    // Enter LPM0, interrupts enabled
}

//  Echo back RXed character, confirm TX buffer is ready first
#pragma vector=USCIAB0RX_VECTOR
__interrupt void USCI0RX_ISR(void)
{
  while (!(IFG2&UCA0TXIFG));             // 发送中断标志检测，每次发送后都要检测
                                          //直到发送完成，才可发送下个字节的数据
  UCA0TXBUF = UCA0RXBUF;                   // TX -> RXed character
}

想利用串口调试助手接收数据，然后利用中断发送数据。可是串口助手始终无法接收到数据