求助：MSP430F149串口收发正常但接收中断进不了

只看该作者 · 2014-4-1 14:26

#include "msp430x14x.h"

unsigned char flag;

void Init_Clk(void)
{
  volatile unsigned char i;
  BCSCTL1 &= ~XT2OFF;                      // XT2on
  BCSCTL2 |= SELM_2 + SELS + DIVS_2;       //MCLK=XT2,SMCLK=XT2/4=2MHz;

  do
  {
  IFG1 &= ~OFIFG;                         // Clear OSCFault flag
  for (i = 0xFF; i > 0; i--);             // Time for flag to set
  }
  while ((IFG1 & OFIFG));                // OSCFault flag still set?
}

void Init_UART(void)
{
  P3SEL |= BIT6;
  P3SEL |= BIT7;                            // P3.6,7 = USART1 option select
  P3DIR |= BIT6;
  UCTL1 |= SWRST;
  UCTL1 |= CHAR;                         // 8-bit character
  UTCTL1 |= SSEL0 + SSEL1;;                         // UCLK = SMCLK
  U1BR0=0Xd0;                            //9600
  U1BR1=0X00;
  UMCTL1=0X40;                         // modulation
  ME2 |= UTXE1 + URXE1;                   // Enable USART1 TXD/RXD
  UCTL1 &= ~SWRST;                         // Initialize USART state machine
//  IFG2  &= ~URXIFG1;
  IE2 |= URXIE1;                         // Enable USART1 RX interrupt
}

void Send_Byte(unsigned char data)
{
  U1TXBUF = data;
  while (!(IFG2 & UTXIFG1)); //USART1 TX buffer ready?
}

int main(void)
{
  volatile unsigned int j;
  WDTCTL = WDTPW + WDTHOLD;                // Stop WDT
  Init_Clk();
  Init_UART();
  _EINT();
  for(;;)
  {
if(flag == 1)
{
   flag = 0;
   Send_Byte(0x10);
   for(j=0;j<5000;j++)
      ;
}
  }
}

#pragma vector = UART1RX_VECTOR
__interrupt void uart1_rx_isr(void)
{
  _DINT();
  flag = 1;
  _EINT();
}