利用TA中断采集电压信号的问题

只看该作者 · 2017-8-19 15:33

思路是利用TA CCR0和CCR2中断，转变flag，然后在主程序里赋值，结果是第一次采样得到的值是270，后来每次采样都是800多，实际电压值换算过来是270，也就是说只有第一次采样正确。。。不知道为什么。。。。。。后来还要实现很多功能，这个结构写的比较乱，但是基本采样可以实现，只是采到的数据只有第一次正确，想了很久了，不知道原因，求助各位大大！！！

#include "io430x54x.h"
#include "adc12.h"
#include "in430.h"
/*初始化电源*/
void Init_Power()
{
  P10DIR |= BIT0;
  P10OUT |= BIT0;
  P10DIR |= BIT2;
  P10OUT |= BIT2;
}
//这个函数用来产生5MHz的时钟信号
void InitClock()
{
P1DIR |= BIT0;
P1SEL |= BIT0; //ACLK output，这时候可以使用示波器观察时钟信号
UCSCTL3 |= SELREF_2; // FLLref = REFO
UCSCTL4 = SELM__DCOCLKDIV + SELS__DCOCLKDIV + SELA__DCOCLKDIV;// 时钟来源:主系统时钟来源DCOCLKDIV；子系统时钟来源DCOCLKDIV；辅助系统时钟来源DCOCLKDIV
UCSCTL5 |= DIVM__1 + DIVS__4 + DIVA__1; // 分频:主系统时钟1分频；子系统时钟16分频；辅助系统时钟1分频
__bis_SR_register(SCG0); // Disable FLL
UCSCTL1 = DCORSEL_6; // 10.7MHz<Fdco<39MHz
UCSCTL2 |= FLLD__2 +151 ; // 约5MHz DCOCLKDIV Fdco/4
__bic_SR_register(SCG0); // Enable FLL
// 等待错误标志清除，振动器稳定
do
{
UCSCTL7 &= ~(XT2OFFG + XT1LFOFFG + XT1HFOFFG + DCOFFG); // Clear XT2,XT1,DCO fault flags
SFRIFG1 &= ~OFIFG; // Clear fault flags
}while (SFRIFG1&OFIFG); // Test oscillator fault flag
}
/*void Init_UART_3()
{
  P10SEL |= 0x30;       // P10_4和P10_5第二功能打开，设置方向
  P10DIR |= 0x10;
  UCA3CTL1 |= UCSWRST;  // 首先使RST位置位，只有这样后面的设置才有效
  UCA3CTL1 |= UCSSEL_2; // SMCLK，为系统时钟1048576Hz
  UCA3BR0 = 9;       // 1MHz 115200
  UCA3BR1 = 0;       // 1MHz 115200
  UCA3MCTL |= UCBRS_1 + UCBRF_0; // 设置调整参数UCBRSx=1, UCBRFx=0
  UCA3CTL1 &= ~UCSWRST; // RST复位
  //UCA3IE |= UCTXIE; // 使能发送中断允许
}*/

//初始化Timer_A1
void Init_Timer_A()
{
P7DIR |= 0x08; // P7.3 output
P7SEL |= 0x08; // P7.3 options select
P11DIR |= 0x01; // P11.0 output red_LED
P11OUT &= ~BIT0; //输出低电平 LED灯亮
TA1CCTL0 = CCIE; // CCR0 interrupt enabled
TA1CCR0 = 10000; //设置周期为40ms
TA1CCTL2 = OUTMOD_3+CCIE; // CCR2 set/reset
TA1CCR2 = 8000; // CCR2 original PWM duty cycle 1/5
TA1CTL = TASSEL_2 + MC_1 + TACLR; // SMCLK, upmode, clear TAR
}
volatile unsigned Point_1,Point_2;
double Point_now ;
double temperature_now;
double i;
int flag,flag2;
#pragma vector=TIMER1_A1_VECTOR
__interrupt void TIMER1_A1_ISR(void)
{
switch(__even_in_range(TA1IV,14))
{
case 0: break; // No interrupt
case 2: break; // CCR1 not used
case 4: flag2 = 1;
      flag = 0;
         break;
case 6: break; // reserved
case 8: break; // reserved
case 10: break; // reserved
case 12: break; // reserved
case 14: break; // overflow
default: break;
}

}
#pragma vector=TIMER1_A0_VECTOR
__interrupt void TIMER1_A0_ISR(void)
{
P11OUT ^= 0x01; // Toggle触发 P11.0
flag = 1;
flag2 = 0;
}

void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;             // Stop WDT
  Init_Power();
  InitClock();                         //初始化时钟

  Init_Timer_A();                //初始化定时器A1

  InitADC12();                         //初始化ADC12

  //Init_UART_3();                      //初始化UART

  _EINT();
  _NOP();
  while(1)
  {

if(flag==1)
{
   flag=0;
   Point_2=(int)read_avg();
      Point_now = 0.2 * i + 0.8 * Point_2;
      Point_2=0;

      //__bis_SR_register(LPM0_bits + GIE);
   }
   else if(flag2==1)
{
   flag2=0;
   Point_1=(int)read_avg();
   i = Point_1;
      Point_1=0;
//Point_now = 0.2 * i + 0.8 * Point_2;
   }

  }



}

#include "msp430x54x.h"
void InitADC12()
{
  ADC12CTL0 &= ~ADC12ENC;
  P6SEL |= 0x10;                                                       // Enable P6.4 as A/D channel input
  ADC12CTL0 = ADC12ON + ADC12SHT0_2;                            // Turn on ADC12, set sampling time, 16ADC12CLK cycles
  ADC12CTL1 = ADC12SHP + ADC12CONSEQ_0 + ADC12SSEL_2; // Use sampling timer, single time single channel,MCLK=4M
  ADC12MCTL0 = ADC12SREF_2 + ADC12INCH_4;                               // ref+ = VeREF+, ref- = AVSS, channel = A4
  //ADC12IE = ADC12IE0;                                                       // Enable ADC12IFG.0
  //ADC12CTL0 |= ADC12ENC;                                                 // Enable conversions
}
unsigned int read_ad()                //开启一次AD转换，并读值
{
  unsigned int ad_value;
  ADC12CTL0|=ADC12SC + ADC12ENC;                //给转换开始脉冲
  //ADC12CTL0&=~ADC12SC;

  while((ADC12CTL1&0X01)==1);          //ADC转换忙信号时等待
  ad_value=ADC12MEM0;                //读取转换结果值
  ADC12CTL0 &= ~ADC12ENC;
  return ad_value;
}
long read_avg()                //数字滤波
{
  long ad_avg=0;             //滤波次数，滤波累加变量
  unsigned int flt_t;
  for(flt_t=0;flt_t<500;flt_t++)
  {
ad_avg+=read_ad();
  }
  ad_avg/=500;
  return ad_avg;
}

//ADC12模块初始化及读值函数
#ifndef __ADC12_H
#define __ADC12_H
void InitADC12();                //初始化ADC12
unsigned int read_ad();       //开启一次AD转换并读值
long read_avg();       //数字滤波
#endif