基于msp430f5529用内部ADC12进行方波频率测试 

main.c

include

include “LCD12864.H”

define key1 !(P3IN&BIT1)

int l = 0; 

unsigned int zhq,check; 

double hzddd,f;

int Cycle[2]; 

//unsigned char tab[]={ }; 

unsigned char tab[]={” “}; 

unsigned char pl[]={“pinlv: hz”}; 

int i; 

unsigned int a[1000]={0}; 

int max,value;

int key();

void find(int *a, int l, int *max, int *value); 

void main(void) { 

WDTCTL = WDTPW | WDTHOLD; // Stop watchdog timer 

P1DIR |= BIT0; //选择P1.0为ACLK时钟输出 

P1SEL |= BIT0; 

P2DIR &= ~BIT0; //设置P2.0为捕获输入口 

P2SEL |= BIT0; 

P2DIR |= BIT2; //设置P2.2为SMCLK时钟输出 

P2SEL |= BIT2; 

TA1CTL = TASSEL_2 + MC_2 + TACLR;//TA1主计数器时钟

    //TA1CCR1=1024;

TA1CCTL1 = CM0 + SCS + CAP + CCIE;

__bis_SR_register(GIE);

while(1) 

{ 

for(i=0;i<1000;i++) 

{ 

if(Cycle[1] > Cycle[0]) 

{ 

zhq=Cycle[1] - Cycle[0]; 

} 

else 

{ 

zhq=Cycle[0] - Cycle[1]; 

}

 hzddd=1 / (double)zhq;

 if(hzddd<0)

     hzddd=-hzddd;

     f=(hzddd*1000000)*1.0525+0.6173;

     if((int)f>30)

     a[i]=(int)f;

    }

     find(a,50,&max,&value);

 tab[0]=((unsigned long)value/10000)+0x30;

 tab[1]=(((unsigned long)value%10000)/1000)+0x30;

 tab[2]=(((unsigned long)value%1000)/100)+0x30;

 tab[3]=(((unsigned long)value%100/10))+0x30;

 tab[4]=((unsigned long)value%10)+0x30;

 pl[6]=tab[0];

 pl[7]=tab[1];

 pl[8]=tab[2];

 pl[9]=tab[3];

 pl[10]=tab[4];

 IO_Init();

 LCD12864_Init();

        if (key())

  {

    while(key())

    {

 LCD12864_SetPos(0,0);

 LCD12864_DisplayString(pl,15);

 LCD12864_Delay(666);

    }}

} 

}

pragma vector=TIMER1_A1_VECTOR

__interrupt void TIMER0_A1_ISR(void) 

{ 

Cycle[l] = TA1CCR1; 

l++; 

if(l==2) 

l=0;

TA1CCTL1 &= ~CCIFG;

 // LPM0_EXIT;

}

int key() 

{ 

{ 

if(key1) 

{ 

LCD12864_Delay(10); 

if(key1) 

{ 

return 1; 

} 

} 

return 0; 

}

}

void find(int *a, int l, int *max, int *value) 

{ 

if(l == 1) 

{ 

*max = 1; 

*value = a[0]; 

return; 

} 

find(a,l-1, max, value); 

if(a[l-1] == *value) *max++; 

else 

{ 

int i, cnt = 1; 

for(i = 0;i