定时器示例程序出错

2万 · 2019-4-20 09:39

void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                // Stop WDT
  P11DIR |= 0x07;                         // ACLK, MCLK, SMCLK set out to pins
  P11SEL |= 0x07;                         // P11.0,1,2 for debugging purposes.
  P2SEL |= 0x0E;                         // P2.1 - P2.3 option select 0000 1110
  P2DIR |= 0x0E;                         // P2.1 - P2.3 outputs
  P4DIR |= 0x10;                         // P1.0 - Outputs
  TA1CCTL0 = OUTMOD_4 + CCIE;             // CCR0 toggle, interrupt enabled
  TA1CCTL1 = OUTMOD_4 + CCIE;             // CCR1 toggle, interrupt enabled
  TA1CCTL2 = OUTMOD_4 + CCIE;             // CCR2 toggle, interrupt enabled
  TA1CTL = TASSEL__ACLK + MC__CONTINOUS + TACLR + TAIE;  // ACLK, contmode, clear TAR,
                                          // interrupt enabled

  __bis_SR_register(LPM3_bits + GIE);    // Enter LPM3, interrupts enabled
  __no_operation();                      // For debugger
}

// Timer1 A0 interrupt service routine
#pragma vector=TIMER1_A0_VECTOR
__interrupt void Timer_A0 (void)
{
  TA1CCR0 += 4;                            // Add Offset to CCR0
}

// Timer_A3 Interrupt Vector (TAIV) handler
#pragma vector=TIMER1_A1_VECTOR
__interrupt void TIMER1_A1_ISR(void)
{
  switch(__even_in_range(TA1IV,14))
  {
case 0: break;
case 2:  TA1CCR1 += 16;                // Add Offset to CCR1
         break;
case 4:  TA1CCR2 += 100;             // Add Offset to CCR2
         break;
case 6:  break;                      // CCR3 not used
case 8:  break;                      // CCR4 not used
case 10: break;                      // CCR5 not used
case 12: break;                      // Reserved not used
case 14: P4OUT ^= 0x10;                // overflow
         break;
default: break;
}
}在P4.4口上得不到周期为4S的方波？