串口初始化问题

只看该作者 · 2018-9-3 21:55

串口初始化的时候为什么只打开接收中断使能，而不能打开发送中断使能？
void init_uart1(void)
{
  P5SEL |= 0xC0;                            // P5.6,7 = USCI_A1 TXD/RXD
  UCA1CTL0 |= 0X80;                         //odd parity
  UCA1CTL1 |= UCSWRST;                   // **Put state machine in reset**
  UCA1CTL1 |= 0X40;                   // ACLK
  UCA1BR0 = 0x03;                            // 1MHz 115200 (see User's Guide)
  UCA1BR1 = 0x00;                            // 1MHz 115200
  UCA1MCTL |= UCBRS_3+UCBRF_0;          // Modulation UCBRSx=1, UCBRFx=0
  UCA1CTL1 &= ~UCSWRST;                   // **Initialize USCI state machine**
  UCA1IE |= UCRXIE;                      // Enable USCI_A1 RX interr
  //__bis_SR_register(GIE);                // 使能中断
  //_EINT();
}