按键设置电压显示按键设置电压显示#define uchar unsigned char#define uint unsigned int#define BIT(x) (10;x-)for(y=1100;y0;y-);void write_com(uchar com) PORTC/PORTCPORTA=com;PORTC|=BIT(4);delay(5); PORTCdelay(5);void write_dat(uchar dat)PORTC|=BIT(2);/PORTCPORTA=dat;PORTC|=BIT(4);delay(5);PORTCdelay(5); void init_1602()PORTCPORTD=i; /把 i 的值赋给 D 口key=PIND; /读出 D 口的数据j=keywhile(j=0XF0);while(key_press(); /松手检测switch(key)case 0xEE:num+;a=0;break;case 0xDE:num+;a=1;break; case 0xBE: num+;a=2;break;case 0x7E:num+;a=3;break;case 0xED:num+;a=4;break;case 0xDD:num+;a=5;break;case 0xBD:num+;a=6;break;case 0x7D:num+;a=7;break;case 0xEB:num+;a=8;break;case 0xDB:num+;a=9;break;case 0xBB:write_com(0x80+0x40+1);write_dat(.);break;case 0x7B:num=0;write_com(0x80+0x40);for(b=0;b5;b+)write_dat(table2b); break;/* case 0xE7:key=0xC;break;case 0xD7:key=0xD;break;case 0xB7:key=0xE;break;case 0x77:key=0xF;break;default:key=16;*/ if(num=1)write_com(0x80+0x40);write_dat(tablea);temp=a*100;if(num=2) write_com(0x80+0x40+2);write_dat(tablea);temp1=a*10;if(num=3)write_com(0x80+0x40+3);write_dat(tablea);temp2=a;temp3=(temp+temp1+temp2)/2+5;n0=temp3/100;n1=temp3%100/10;n2=temp3%10;write_com(0x80+0x40+8);write_dat(tablen0);write_dat(tablen1);write_dat(tablen2); / return key;int main()DDRA=0xff;DDRC=0xff;PORTA=0xff;PORTC|=0x00;init_1602();write_com(0x80);for(b=0;b14;b+)write_dat(table1b);write_com(0x80+0x40);for(b=0;b5;b+)write_dat(table2b); / DDRB=0XFF;/ PORTB=0XFF;while(1)key_scan();