我看了官方的USER's Guide几遍， 查了资料都没办法弄出来， 问题是数码管显示“255” 不变， 请哪位高手帮我指出错误， 非常谢谢！
//*********************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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