/*
[文件名] TLC2543.c
[作者] 鞠春陽
[版本] 1.0
*/

#include "reg51.h"
#include "intrins.h"
sbit CLK   = P1^0;
sbit DIN   = P1^1;
sbit DOUT  = P1^2;
sbit CS    = P1^3;

/*2543通道的選擇，與設置*/
unsigned int TLC2543(unsigned char port)         //從TLC2543讀取采樣值,形參port是采樣的通道號
    {
    unsigned int  value;                             //轉換結果
    unsigned char i;                                 //計數器
    unsigned char lowbyte=0,highbyte=0;              //初始化為0
    CLK=0;
    CS=0;
    port<<=4;
    for (i=0;i<4;i++)                                //把通道號打入2543
        { 
        DIN=(bit)(port&0x80);
        CLK=1;
        CLK=0;
        port<<=1;
        }
    DIN=0;                   //??
          //fast mode 1
    for (i=0;i<8;i++)                               //填充6個CLOCK
        {    
		CLK=1;
        CLK=0;
        }
    CS=1;
    delay();
    CS=0;                                           //等待AD轉換
    for (i=0;i<4;i++)                               //取D11,D10,D9,D8, 送到highbyte
        {
        DOUT=1;
        CLK=1;
        highbyte<<=1;
        if(DOUT) highbyte=highbyte|0x01;  //??
        CLK=0;
        }
    for (i=0;i<8;i++)                               //取D7--D0,送到lowbyte
        {
        DOUT=1;
        CLK=1;
        lowbyte<<=1;
        if(DOUT) lowbyte=lowbyte|0x01;    //??
        CLK=0;
        }
    CS=1;
    value=(unsigned int)highbyte;
    value<<=8;
    value=value|lowbyte;
    value=(unsigned int)value;                      //得到AD值
    return (value);                                 //返回結果
    }


/*讀2543的某一個通道*/
ReadTLC2543(unsigned char x)
   {
   unsigned int i=0;
   float j=0;
   j=TLC2543(0);
   j=j/4096;
   j=j*40000;
   i=j;
   return i;
   }