//[ADC.c]A/D轉(zhuǎn)換-----------------------------------------------------------*
//本文件包含:                                                              *
//    (1)ADCInit:A/D轉(zhuǎn)換初始化                                             *
//    (2)ADCvalue:獲取1路A/D轉(zhuǎn)換結(jié)果                                       *
//    (3)ADCmid:獲取中值濾波后的A/D轉(zhuǎn)換結(jié)果                                *
//    (4)ADCave:獲取均值濾波后的A/D轉(zhuǎn)換結(jié)果                                *
//硬件連接:                                                                *
//    PAD1 接模擬量輸入端                                                  *
//-------------------------------------------------------------------------*

//頭文件
#include "ADC.h"    //A/D轉(zhuǎn)換頭文件

//ADCInit:A/D轉(zhuǎn)換初始化----------------------------------------------------*
//功  能:初始化AD轉(zhuǎn)換                                                      *
//參  數(shù):無                                                                *
//返  回:無                                                                *
//-------------------------------------------------------------------------*
void ADCInit(void)
{
    //ATDCTL2.ADPU = 1為打開轉(zhuǎn)換電源開關(guān)
    //ATDCTL2.AFFC = 1為A/D轉(zhuǎn)換CCF自動(dòng)清0位
    ATD0CTL2 = 0xC0;
    //ATDCTL3.S4C = 1表示序列長(zhǎng)度為4
    //ATDCTL3.FIFO = 0為非FIFO模式
    //ATDCTL3.FRZ0～FRZ1 = 00表示凍結(jié)模式
    ATD0CTL3 = 0x20;
    //ATDCTL4.PRS4～PRS0 = 00111表示總線頻率16分頻
    ATD0CTL4 = 0x87;
    //ATDCTL4.SRES8 = 1表示8位轉(zhuǎn)換精度
    ATD0CTL5 = 0x80;
}
//ADCvalue:1路8位A/D轉(zhuǎn)換函數(shù)----------------------------------------------*
//功  能:獲取通道channel的8位A/D轉(zhuǎn)換結(jié)果                                  *
//參  數(shù):channel=通道號(hào)(0~15)                                              *
//返  回:該通道的A/D轉(zhuǎn)換結(jié)果(0~1023)                                       *
//-------------------------------------------------------------------------*
INT8U ADCvalue(INT8U channel)
{ 
    INT8U temp;  //暫存A/D轉(zhuǎn)換的結(jié)果
	  //ATDCTL5.DJM = 0,結(jié)果寄存器數(shù)據(jù)采用右調(diào)整
	  //ATDCTL5.SCAN = 1,連續(xù)轉(zhuǎn)換序列
    //ATDCTL5.CC～CA = channel,啟動(dòng)通道轉(zhuǎn)換
	  ATDCTL5 = (0x80 | channel);
    //取A/D轉(zhuǎn)換結(jié)果
  	while (1)
  	//判斷ATDSTAT0的第7位是否為1
  	if ((ATDSTAT0&(1<< 7)) != 0)
  	{
  	    temp = ATD0DR0L;  //從A/D數(shù)據(jù)寄存器0中讀8位數(shù)據(jù)
  	    break;
  	}
  	return  temp;
}
/*
//ADCmid:1路A/D轉(zhuǎn)換函數(shù)(中值濾波)------------------------------------------*
//功  能:獲取通道channel中值濾波后的A/D轉(zhuǎn)換結(jié)果                            *
//參  數(shù):channel=通道號(hào)(0~4)                                               *
//返  回:該通道中值濾波后的A/D轉(zhuǎn)換結(jié)果(0~255)                              *
//內(nèi)部調(diào)用函數(shù):ADCvalue                                                    *
//-------------------------------------------------------------------------*
INT8U ADCmid(INT8U channel) 
{
    INT8U i,j,k,tmp;
    //1.取三次A/D轉(zhuǎn)換結(jié)果
    i = ADCvalue(channel);
    j = ADCvalue(channel);
    k = ADCvalue(channel);
    //2.從三次A/D轉(zhuǎn)換結(jié)果中取中值
    if (i > j)
    {
        tmp = i; i = j; j = tmp;
    }
    if (k >= j)
    {
        tmp = j;
    }
    else
    {
        if (k >= i)
            tmp = k;
        else
            tmp = i;
    }
    return tmp;
}
 
//ATDave:1路A/D轉(zhuǎn)換函數(shù)(均值濾波)------------------------------------------*
//功  能:對(duì)通道channel的A/D轉(zhuǎn)換結(jié)果求n次平均值                             *
//參  數(shù):n=均值濾波次數(shù)(0~255),channel=通道號(hào)(0~15)                        *
//返  回:該通道均值濾波后的A/D轉(zhuǎn)換結(jié)果                                     *
//內(nèi)部調(diào)用函數(shù):ADCmid                                                      *
//-------------------------------------------------------------------------*
INT8U ADCave(INT8U n,INT8U channel) 
{
    //求n次A/D轉(zhuǎn)換的平均值
    INT8U i;
    INT8U j;
    if(0 == n)    n = 1;
    j = 0;
    for (i=0; i<n; i++)
        j += ADCmid(channel);
    j /= n;
    return j;
}

*/