單片機實現(xiàn)5v以下電壓向數(shù)字量的轉換

#include<hidef.h> /*commondefinesandmacros*/#include<mc9s12dg128.h> /*derivativeinformation*/#pragmaLINK_INFODERIVATIVE"mc9s12dg128b"

unsignedcounter;unsignedinta[3];

/**************************輸入輸出***************************/

//Functionput_char:putachartoSCI0voidput_char(unsignedcharc){

while((SCI0SR1&0x80)==0);SCI0DRL=c;

}

//Functionget_char:waitforacharfromSCI0unsignedcharget_char(void){

while((SCI0SR1&0x20)==0);

return(SCI0DRL);

}

//定義本函數(shù)的目的是實現(xiàn)字符量2.35V向字符235轉換

unsignedint*get_zifu(void){unsignedint*p;

unsignedj=0;unsignedchard;do{

d=get_char();put_char(d);if(d>='0'&&d<='9'){

a[j++]=d-0x30;

}

}

while(d!='V'||d!='v');put_char('V');p=&a[0];

returnp;

}

/************************結果顯示*****************************/voidresults_disy(void){

unsignedinth;h=PORTA;

if(h>=0x00&&h<=0x0F){PORTB=ATD0DR0L;

}//顯示整數(shù)部分

else{

PORTB=ATD1DR1L;

}//顯示小數(shù)部分；

}

/****************************AD********************************/unsignedchar AD0_convert(unsignedintch){

unsignedchar*p;ATD0CTL2=0xC0;ATD0CTL5=0x80+ch;while(ATD0STAT1==0);p=&ATD0DR0L;ATD0CTL2=0x40;

return(*p);

}

unsignedchar AD1_convert(unsignedintch){unsignedchar*p;

ATD1CTL2=0xC0;ATD1CTL5=0x80+ch;while(ATD1STAT1==0);p=&ATD1DR0L;ATD1CTL2=0x40;

return(*p);

}

voidAD_test(void){unsignedintr0,r1,r2;r1=10*a[1]+a[2];

r0=AD0_convert(a[0]);r2=AD1_convert(r1);

//usePORTBtodisytheresultsresults_disy();

}

/***************************main函數(shù)*************************/voidmain(void){

/*putyourowncodehere*/DDRB=0XFF;PORTB=0XF0;

counter=0;

EnableInterrupts;

RTICTL=0X71;//RealTimeClockDivider 15/SECCRGINT|=0X80;//EnableRealTimeInterrupt

//AD初始化ATD0CTL2=0x00;ATD0CTL3=8;ATD0CTL4=0xC5;ATD0DIEN=0;

ATD1CTL2=0x00;

ATD1CTL3=8;

ATD1CTL4=0xC5;

ATD1DIEN=0;

for(;;){}

}

//定時器

interrupt7voidRTC(void){CRG =0X80;

counter++;if(counter>12){

counter=0;AD_test();?

}

RTICTL=0X71;//RealTimeClockDivider 15/SECCRGINT|=0X80;//EnableRealTimeInterrupt

}

//總線頻率為16MHz；RTICTL前四位a，后四位b，即RTICTL=0xa