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標(biāo)題: 用MSP430F5438A檢測(cè)頻率有問(wèn)題 [打印本頁(yè)]

作者: mqwu 時(shí)間: 2014-10-18 15:47
標(biāo)題: 用MSP430F5438A檢測(cè)頻率有問(wèn)題
我看了官方的USER's Guide幾遍，查了資料都沒(méi)辦法弄出來(lái)，問(wèn)題是數(shù)碼管顯示“255” 不變，請(qǐng)哪位高手幫我指出錯(cuò)誤，非常謝謝！
//*********************Capture the frequency test **************************
//  ACLK = TACLK = 32kHz, MCLK = SMCLK = default DCO ~1.045MHz
//
//  As coded and with TACLK = 1.045MHz, toggle rates are:
//  P2.1= CCR0 = 1045000/260 = 4.19kHz
//  P2.2= CCR1 =65 50% dutycycle;
//  P2.3= CCR2 =26 80% dutycycle;
//
//             MSP430F5438A
//          -------------------
//       /|\|                |
//       --|RST             |
//          |                |
//          |       P2.1/TA1.0|--> CCR0
//          |       P2.2/TA1.1|--> CCR1-----|
//          |       P2.3/TA1.2|--> CCR2    | connected as this
//          |             P1.2|--> TA0.1----|
//
//  MQ.Wu Eastar-HK.COM
//******************************************************************************
#include <msp430.h>
#include <stdlib.h>
#include <stdio.h>
#include "PIN_DEF.H"
#define uchar unsigned char
#define uint unsigned int
uchar Count=0, First_Time=0x01;
uint REdge1, REdge2, FEdge;
uchar num1, num2, num3, num4;

uchar const table[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
uchar const table1[]={0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10};

void Init_Port(void)
{
  P5DIR  |= POWER ; //define the direction for O/P;
  MAIN_POWER_ON ;
  P7DIR  |= LED_PWR  ;
  P7OUT  |= LED_PWR ;// turn off the LED;
  //INTERNAL_PULL_UP    ;
// ROW_IN_COL_OUT       ;
  P1OUT = 0xF0          ;
  P1DIR = 0xF0       ;
  P9OUT = 0x0F       ;
  P9DIR = 0x0F    ;
  P8DIR = 0xFF;
  P8OUT = 0xFF;

}
void Display(num1,num2,num3,num4)
{

P8OUT = table[num1];
P9OUT &= ~BIT0;
__delay_cycles(100);
P9OUT |= BIT0;

P8OUT = table[num2];
P9OUT &= ~BIT1;
__delay_cycles(100);
P9OUT |= BIT1;

P8OUT = table[num3];
P9OUT &= ~BIT2;
__delay_cycles(100);
P9OUT |= BIT2;

P8OUT = table[num4];
P9OUT &= ~BIT3;
__delay_cycles(100);
P9OUT |= BIT3;

}

int main(void)
{
  uint Period, ON_Period;
  uchar DutyCycle;
  WDTCTL = WDTPW + WDTHOLD;                // Stop WDT
  Init_Port();
  P1DIR &= ~BIT2;                         // P1.2/TA0.1 Input Capture
  P1SEL |= BIT2;                         // TA0.1 option select
  P2DIR |=0x0C;
  P2SEL |=0x0C;
  TA0CCTL1 = CAP + CM_3 + CCIE + SCS + CCIS_0;
  TA0CTL = TASSEL_2 + MC_2 + TAIE + TACLR;       // SMCLK, continous mode, clear TAR

  TA1CCR0 = 130;                         // PWM Period/2
  TA1CCTL1 = OUTMOD_6;                   // CCR1 toggle/set
  TA1CCR1 = 65;                            // CCR1 PWM duty cycle
  TA1CCTL2 = OUTMOD_6;                   // CCR2 toggle/set
  TA1CCR2 = 26;                            // CCR2 PWM duty cycle
  TA1CTL = TASSEL_2 + MC_3 + TACLR;       // SMCLK, up-down mode, clear TAR
  //__bis_SR_register(LPM0_bits);          // Enter LPM0

  //__bis_SR_register( GIE);

  while(1)
  {

   __bis_SR_register(GIE);
   if (TA0CCTL1 & COV)                // Check for Capture Overflow
   {
      TA0CCTL1 &=~COV;
      while(1);                      // Loop Forever
   }
   Period = REdge2 - REdge1;          // Calculate Period
   ON_Period = FEdge-REdge1;          // On period
   DutyCycle = ((unsigned long)ON_Period*100/Period);
   num1=DutyCycle/1000;
   num2=DutyCycle%1000/100;
   num3=DutyCycle%100/10;
   num4=DutyCycle%10;
   Display(num1,num2,num3,num4);
  }
}

#pragma vector=TIMER0_A1_VECTOR
__interrupt void TIMER0_A1_ISR(void)
{

  switch(__even_in_range(TA0IV,14))
  {
case 0: break;
case 2: if (TA0CCTL1 & CCI)                // Capture Input Pin Status
      {
         // Rising Edge was captured
         if (!Count)
         {
            REdge1 = TA0CCR1;
            Count++;
         }
         else
         {
            REdge2 = TA0CCR1;
            Count=0x0;
            __bic_SR_register_on_exit(LPM0+ GIE);  // Exit LPM0 on return to main
         }

         if (First_Time)
            First_Time = 0x0;
      }
      else
      {
         // Falling Edge was captured
         if(!First_Time)
         {
            FEdge = TA0CCR1;
         }
      }

         break;
case 4:  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: break;
default: break;
}
}

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