ADC0804模數(shù)轉(zhuǎn)換與顯示

1、ADO模轉(zhuǎn)換與現(xiàn)實（擴展用1602帶電阻值顯示）實驗?zāi)康模?. 掌握ADC的使用控制方法。2. 實驗內(nèi)容：基本要求：設(shè)計一程序采集ADC0809第3通道的電壓值，將其轉(zhuǎn)換為數(shù)字量，并在數(shù)碼管上顯示；5V顯示為255,0V顯示為000。3. 擴展要求：將轉(zhuǎn)換結(jié)果以用1602表現(xiàn)出當(dāng)前電阻值。C程序:#include<reg52.h>#include<intrins.h>#defineuintunsignedint#defineucharunsignedcharsbitCS=P2A1;sbitwr=P2A4;sbitrd=P2A5;sbitlcd1=P2A3;sbitlcd

2、en=P2A2;sbitlcdrs=P2A0;sbitdula=P2A7;/52系列單片機頭文件/包含_nop_函數(shù)所在的頭文件/宏定義/ADC0804CS端/ADC0804WR端/ADC0804RD端/lcd鎖存器/lcd1602EN端/lcd1602RS端/段選端sbitwela=P2A6;/位選端/floatr;ucharcodetable=(0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71;voiddelay(uintxms)/延時函數(shù)(uinti,j;for(i=xms;i&

3、gt;0;i-)for(j=110;j>0;j-);voiddisplay(ucharbai,ucharshi,ucharge)/數(shù)碼管顯示函數(shù)(dula=1;打開段選P0=tablebai;/送入百位dula=0;/關(guān)閉段選P0=0xff;/消隱wela=1;/打開位選P0=0x7e;/選擇第一位wela=0;/關(guān)閉位選P0=0;/消隱延時delay(5);dula=1;P0=tableshi;dula=0;P0=0xff;wela=1;P0=0x7d;wela=0;P0=0;delay(5);dula=1;P0=tablege;dula=0;P0=0xff;wela=1;P0=0x7

4、b;寫指令寫數(shù)據(jù)wela=0;P0=0;delay(5);voidwrite_com(ucharcom)/1602(lcdrs=0;P0=com;delay(5);lcden=1;delay(5);lcden=0;voidwrite_data(uchardata1)/1602(lcdrs=1;P0=data1;delay(5);delay(5);lcden=0;voidinit()/1602初始化(dula=0;/關(guān)閉段選wela=0;/關(guān)閉位選lcden=0;/lcden置于低電平write_com(0x38);設(shè)置16*2顯示，5*7點陣，8位數(shù)據(jù)接write_com(0x0c);/設(shè)置開

5、顯示，不顯示光標write_com(0x06);/寫一個字符后地址加write_com(0x01);/顯示清0，數(shù)據(jù)指針清0voidlcd_display(uintge,F1,F2,F3,F4)/lcd_顯示(F1小數(shù)點后一位F2小數(shù)點后兩位F3F4)(wela=0;dula=0;鎖存器/選擇在1602第一行顯示/ascii碼48寫入個位/延時lcd1=1;打開led/write_com(0x01);write_com(0x80);write_data(48+ge);delay(5);write_data('.');delay(5);write_data(48+F1);dela

6、y(5);write_data(48+F2);delay(5);write_data(48+F3);delay(5);write_data(48+F4);delay(5);write_data('K');delay(5);lcd1=0;關(guān)閉鎖存器voidmain()/主程序(uchara,A1,A2,A3,shu;uintge,F1,F2,F3,F4;floatr;init();CS=0;while(1)(r=(255-shu)/256;/轉(zhuǎn)換公式wr=1;_nop_();wr=0;/啟動A/D轉(zhuǎn)換_nop_();wr=1;for(a=10;a>0;a-)(display

7、(A1,A2,A3);P1=0xff;讀取P1口之前先給其寫全1rd=1;選通AD0804CS端_nop_()；rd=0;/A/D讀使能_nop_();shu=P1;/A/D數(shù)據(jù)讀取賦給P1口rd=1;A1=shu/100;數(shù)碼管分出百十個A2=shu%100/10;A3=shu%10;ge=(int)r%10;/(int)字符型強制轉(zhuǎn)換成整形1602分出個位跟小數(shù)點后四位F1=(int)(r*10)%10;F2=(int)(r*100)%10;F3=(int)(r*1000)%10;F4=(int)(r*10000)%10;lcd_display(ge,F1,F2,F3,F4);仿真圖:rflHLlO用li!15it*印knr-flIK-liZi=*i受1RPEiranawRgTPJLa3"qmA0F7J£i1MX