MSP430采集电压信号程序

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

//功能介绍：对P6.0口电压进行采集 液晶显示

//****************************************************
#include 
#include  "BoardConfig.h"
#include  "cry1602.h"

#define   Num_of_Results   32

uchar shuzi[] = {"0123456789.+"};
uchar tishi[] = {"The Volt is:"};

static uint results[Num_of_Results];    //保存ADC转换结果的数组                                                     // is not used for anything.
void Trans_val(uint Hex_Val);          

void main(void)
{
  WDTCTL = WDTPW+WDTHOLD;                   //关闭看门狗
  BoardConfig(0xb8);                        //关闭数码管、流水灯、4245
  LcdReset();                               //复位1602液晶
  DispNChar(2,0,12,tishi);                  //显示提示信息
  Disp1Char(11,1,'V');                      //显示电压单位
  P6SEL |= 0x01;                            // 使能ADC通道
  ADC12CTL0 = ADC12ON+SHT0_8+MSC;           // 打开ADC，设置采样时间
  ADC12CTL1 = SHP+CONSEQ_2;                 // 使用采样定时器，单路重复采集
  ADC12IE = 0x01;                           // 使能ADC中断
  ADC12CTL0 |= ENC;                         // 使能转换
  ADC12CTL0 |= ADC12SC;                     // 开始转换
  _EINT();                                  //使能中断
  LPM0;                                     //低功耗模式
}

#pragma vector=ADC_VECTOR
__interrupt void ADC12ISR (void)
{
  static uint index = 0;

  results[index++] = ADC12MEM0;               // Move results
  if(index == Num_of_Results)
  {
        uchar i;
        unsigned long sum = 0;

        index = 0;
        for(i = 0; i < Num_of_Results; i++)
        {
            sum += results[i];
        }
        sum >>= 5;                            //除以32
        sum=(sum<<4)+(sum<<2)+sum;            //增大21倍原因是大电压变为小电压采集的
        Trans_val(sum);
  }
}

void Trans_val(uint Hex_Val)
{
    unsigned long caltmp;
    uint Curr_Volt;
    uchar t1,i;
    uchar ptr[6];
   
    caltmp = Hex_Val;
    caltmp = (caltmp << 5) + Hex_Val;           //caltmp = Hex_Val * 33 扩大10倍便于计算
    caltmp = (caltmp << 3) + (caltmp << 1);     //caltmp = caltmp * 10  扩大10倍便于计算
    Curr_Volt = caltmp >> 12;                   //Curr_Volt = caltmp / 2^n
    ptr[0] = 11;                                //数字表中第11位对应符号"+"
    ptr[1] = Curr_Volt / 1000;                  //相当于十位上的数值
    ptr[2] = (Curr_Volt%1000) / 100;            //相当于个位上的数值
    t1 = Curr_Volt - (ptr[1] * 1000)-(ptr[2] * 100);
    ptr[4] = t1 / 10;                           //相当于小数点后第一位
    ptr[5] = t1 - (ptr[4] * 10);                //相当于小数点后第二位
    ptr[3] = 10;                                //数字表中第10位对应符号"."
    //在液晶上显示变换后的结果
    for(i = 0;i < 6;i++)
      Disp1Char((4 + i),1,shuzi[ptr[i]]);       
}