//參考程序B.WADC0.c程序模/數轉化通道AIN0.0的輸入值，數碼管顯示兩位16進制數.
//測試前將S6的第一撥碼開關撥到ON
#include <c8051f020.h>                  
sfr16 TMR3RL  = 0x92;     
sfr16 TMR3     = 0x94;              
sfr16 ADC0     = 0xbe;        
#define SYSCLK 2000000         
bit LCDBit;
unsigned long x;
void PORT_Init (void);
void Timer3_Init (int counts);
void ADC_Init(void);
void ADC_ISR (void);
void LCD_Init(void);
void main (void) {
	unsigned char data1,i;
	unsigned char *lcdpoint;   	//指向 lcddata數組的指針
	unsigned char ADC0Data[10]={0x0a,0x0d,0x0c,0x00,0x68,0x68};
   WDTCN = 0xde;
   WDTCN = 0xad;   	//禁止看門狗定時器
	LCDBit=0;
  // PORT_Init();
   LCD_Init();
   Timer3_Init (SYSCLK / 12 /5 );  
   ADC_Init();                                     
   EA = 1;									
     AMX0SL =0x00;         	//選擇通道0
     for(x=0;x<=50000;x++); 
	 /*
	 AMX0SL =0x01;         				//選擇通道1
	 for(i=0;i<=50000;i++); 
	 AMX0SL =0x02;         				//選擇通道2
	 for(i=0;i<=50000;i++); 
	 AMX0SL =0x03;         				//選擇通道3
	 */
   while (1)
    {
	 	if(LCDBit==1){
			TMR3CN &= 0xfb; 				//關定時器3                  
			LCDBit=0;						//清LCD顯示位
	   		P7 = 0x02;						//LCD指針返回初始位置
   			P6 = 0x0;
   			P6 = 0x1; 
			ADC0Data[9]=ADC0&0x0f;			//將A/D轉化值存到顯示數組
			ADC0Data[8]=(ADC0>>4)&0x0f;
			ADC0Data[7]=(ADC0>>8)&0x0f;
			ADC0Data[6]=(ADC0>>12)&0x0f;
	    	P6  = 0x05;                   	//準備送數據
	    	for(x=0;x<5000;x++);
	    	lcdpoint = &ADC0Data;
	    	for(i=10;i>0;i--)     			//顯示第一行字符
	    	{ 
		    	data1=*lcdpoint;
		if(data1>=0x0a) data1 += 0x37;	//將顯示數據轉化為液晶的顯示字符碼
				else data1 += 0x30;
		    	P7 = data1; 
				P6 = 0x04;
	        	P6 = 0x05;
	        	lcdpoint++;
				for(x=0;x<100;x++);
			}
		   TMR3CN |= 0x04;					//使能定時器3                   
		}                  
	}
}
void LCD_Init(void)
{
   P6 = 0x01;
   for(x=0;x<50000;x++);
   //P7 = 0x30;				/*一行顯示*/
   P7 = 0x38;				/*兩行顯示*/
   P6 = 0x0;
   P6 = 0x1; 
   for(x=0;x<1000;x++);
   P7 = 0x0e;				//開顯示，開光標，字符不閃爍
   P6 = 0x0;
   P6 = 0x1;
   for(x=0;x<1000;x++);		
   P7= 0x016;				//AC自動增1，整體顯示不移動
   P6 = 0x1;
   P6 = 0x01;
   for(x=0;x<5000;x++);		
   P7 = 0x01;				//清除DDRAM,置AC=0
   P6 = 0x00;
   P6 = 0x01; 
   for(x=0;x<5000;x++);
}
void PORT_Init (void)
{
   XBR2    = 0x40;  		//使能交叉開關                   
   P74OUT |= 0x0ff;     	//推挽輸出
}
void Timer3_Init (int counts)
{
   TMR3CN = 0x00;           //定時器T3使用系統時鐘的12分頻.禁止T3           
   TMR3RLL  = -counts;  		//初始化重載值           
   TMR3L    = 0xffff; 		//設置自動重載值                 
   TMR3CN |= 0x04;          //允許定時器T3         
}
void ADC_Init(void)
{
 ADC0CN  |=0x84;	/*ADC0使能，定時器T3溢出使能模/數轉換*/
 REF0CN |=0x03;		/*內部電壓基準提供從VREF腳輸出，ADC0電壓基準取自VREF0*/
 ADC0CF |=0x50;		/*轉換周期為一個時間系統,增益為1*/
 AMX0CF |=0x00;		/*單端輸入*/
 EIE2   |=0x02;		/*ADC0轉換結束中斷*/
}
void ADC_ISR (void) interrupt 15
{
  AD0INT=0;			//清A/D中斷標志
  LCDBit=1;			//置LCD顯示位
}