电压升高，输出的PWM占空比就变

1万 · 2019-9-22 17:01

我想输入一个模拟信号，当电压升高，输出的PWM占空比就变大。但是程序进不了中断，请帮忙看看这段程序，谢谢。程序是改别人的，刚开始学，见笑了

1万 · 2019-9-22 17:05

#include "msp430x14x.h"

#define uchar unsigned char

#define uint unsigned int

uint Results[32];       //存放ADC的转换结果

long A_verage;          //存放32个数据之和

uint A_ve = 0;          //存放32个数的平均值

void main( void )

{

WDTCTL = WDTPW + WDTHOLD;

P6DIR  = BIT0;

P6SEL |= 0x01;                         // Ena××e A/D channel A0

ADC12CTL0 = ADC12ON + SHT0_15 + MSC;    // Turn on ADC12, set sampling time

ADC12CTL1 = SHP + CONSEQ_2;             // Use sampling timer, set mode

ADC12IE = 0x01;                         // Ena××e ADC12IFG.0

ADC12CTL0 |= ENC;                      // Ena××e conversions

ADC12CTL0 |= ADC12SC;                   // Start conversion

TBCTL = TBSSEL_1 + TBCLR + MC0;

TBCCTL1 = OUTMOD_7;

TBCCR0 = 500;

TBCCR1 = 250;

P4DIR = 0X02;

P4SEL = 0X02;

_EINT();

while(1);

}

/*******************************************

函数名称：ADC12ISR

功能：ADC12的中断服务函数

参数：无

返回值  ：无

********************************************/

#pragma vector=ADC_VECTOR

__interrupt void ADC12ISR (void)

{

static uchar index = 0;

Results[index++] = ADC12MEM0;                   // Move results, IFG is cleared

if(index == 32)

{

      uchar i;



      A_verage = 0;

      for(i = 0; i < 32; i++)

         A_verage += Results[i];

      A_verage >>= 5;                         //除以32求平均值

      if(A_verage > A_ve)

      {

         if(TBCCR1 < 500) TBCCR1 = TBCCR1 + 10;

         else TBCCR1 = 0;

      }

      else

      {

         if(TBCCR1 > 10) TBCCR1 = TBCCR1 - 10;

         else TBCCR1 = 500;

      }

      A_ve = A_verage;



      index = 0;

}

}