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1、单片机制作的电压表#include#inelude〈intrins.h>#defineucharunsignedchar#defineuintunsignedintsfrADC_CONTR=OxBC;//A/D转换功能允许寄存器sfrADC_RES二OxBD;//A/D转换结果寄存器sfrADC_RESL=OxBE;//A/D转换结果寄存器低sfrAUXRl=0xA2;//辅助寄存器1sfrPl_ASF=0x9D;//A/D转换控制寄存器sbitADIO二P「7;//l.7口接测量电压sbitU3_DS二P「5;sbitU3_STCP二P「4;sbit
2、U3_SHCP二P「3;sbitU4_DS二P「2;sbitU4_STCP=Pri;sbitU4_SHCP=PrO;ucharkeyval[]二{'O','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F','G'ucharcodekey_code[]二{0x77,0x7B,0x7D,0x7E,0xB7,OxBB,OxBD,OxBE,0xD7,OxDB,OxDD,OxDE,0xE7,OxEB,Ox：ucharkey,couni;voiddelay(unsignedintn);//74HC595voidU3
3、595(unsignedcharnum)unsignedcharcountl;for(countl=0;countl<=7;count1++){if((num&0x80)==0x80)//最高位为1,则向SDATA_595发送1{U3_DS=1;}else{U3_DS=0;}U3_SI1CP=O;U3SHCP=1;num<<=l;//左移}U3_STCP=0;U3_STCP二1;}voidU4_595(unsignedcharnum)//发送指令到RS,RW,E(4,5,6位)7unsignedcharcount2;for(count2=0;count2<=7;coun
4、t2++){if((num&0x80)==0x80){U4_DS=1;}else{U4_DS=0;}U4_SHCP二0;U4_SHCP=1;num<<=l;}U4_STCP=0;U4_STCP二1;}//LCD延时子程序n二1时延时1msvoiddelay(unsignedintn){unsignedchari;for(;n>0;n--)for(i=0;i<125;i++)_nop_();}〃写指令到LCDvoidwemd(unsignedcharemd){U4_595(OxOF);U3_595(emd);U4_595(0x4F);U4_595(OxOF);}〃写要显示
5、的数据到LCDvoidwdat(unsignedchardat){U4_595(0xlF);〃低4位全为1屏蔽8段数码管U3_595(dat);U4_595(0x5F);U4_595(0xlF);5*7点阵〃有键按下？//去抖动〃有键按下〃获得键码//初始化LCDvoidinit()wcmd(0x38);//设置8位总线双行显示,delay(20);wcmd(OxOC);//开显示，开光标，不闪烁delay(20);wcmd(0x06);//读写字符时地址加1delay(20);wcmd(0x01);//清屏delay(20);wcmd(0x82);}〃键盘扫描子程序u
6、charkeyscan(void){unsignedcharhang,1ie,keycode;chari;P0二OxfO;hang=P0;if((hang&OxfO)!=0xf0){delay(5);hang=PO;if((hang&OxfO)!=0xf0){P0二OxOf;lie=P0;keycode二hang
7、lie;for(i=15;i>=0;i一一)if(keycode==key_code[i])//查找键码key二i;return(ke)0;}elsereturn(key);voidkeydown()〃判断按键按下和显示程序POOxf0;if((P0&0xf0
8、)!=0xf0){while(P0!=0xf0)keyscanO;//获得键码wcmd(OxCF);//设置键值显示位置wdat(keyval[16-key]);r}voidADC_P0WER_0N()//开ADC电源，第一次使用要打开内部模拟电源{ADC_C0NTR=0x80;delay(10);}voidSET_P1ASF(unsignedcharchannel)//设置模拟功能口{unsignedchari,final=0x01;for(i=0;i<=channel;i++)final«=l;Pl_ASF=final;}voidSE
