51單片機(jī)驅(qū)動(dòng)12位AD轉(zhuǎn)換MAX1241程序及原理圖

下面是MAX1241和51單片機(jī)連接的電路圖：

本程序的完整工程文件下載: http://www.torrancerestoration.com/f/1241.rar
以下是源碼:
#include <reg51.h>
#define uchar unsigned char
#define uint unsigned int
#define High 1
#define Low 0
int t;
sbit cs=P2^7;
sbit sclk=P2^6;
sbit dout=P2^5;
unsigned char b[5];
uchar code tv[]={0x08,0x10,0x20,0x40,0X80};//位選
uchar code dc[]={0xC0, //"0"
                0xF9,  //"1"
                0xA4,  //"2"
                0xB0,  //"3"
                0x99,  //"4"
                0x92,  //"5"
                0x82,  //"6"
                0xF8,  //"7"
                0x80,  //"8"
                0x90,  //"9"
    };
uint dushuju() //定義為可以返回的參數(shù)
{
 uint voltage_temp=0;
 uchar ucloop=12;
 cs=High;
 sclk=Low;
 cs=Low;
 while(dout==0);//EOC信號(hào)為高表示轉(zhuǎn)換結(jié)束
 sclk=High;
 sclk=Low;
 while(ucloop--)
 {
 sclk=High;//上升沿?cái)?shù)據(jù)穩(wěn)定并讀出
 voltage_temp<<=1;
 if(dout==1)
 voltage_temp+=1;
 sclk=Low;
 }
 cs=High;
 return voltage_temp;   //返回?cái)?shù)據(jù)
}
void shuxiang(void )
{
 char i, j;
 t=dushuju();   //調(diào)用數(shù)據(jù)
 b[0]=(t/10000)%10;         //取得整數(shù)值到數(shù)組          
 b[1]=(t/1000)%10;                                      
 b[2]=(t/100)%10;                                       
 b[3]=(t/10)%10;                                        
 b[4]=(t/1)%10;
 b[5]=0;
 for(i=0;i<5;i++)
 {
 P3=tv[i];
 j=b[i];
 P1=dc[j];
 Delay();
 }
}
void delay(void)
{
uint i;
for(i=0;i<100;i++);
}
main()
{
loop:  
dushuju();
shuxiang();
goto loop; 
}