单片机测量电压的程序.doc

主要程序如下：#include stc15.h#define FOSC 11059200L /系统频率#define BAUD 115200 /串口波特率sbit P23 =P23; sbit P22 =P22;sbit P21 =P21;unsigned char dataH,dataL;unsigned int Volut,Shangxian,Xiaxian;unsigned char Recieve4;unsigned char i=0,m=0;unsigned char time0count;unsigned char qian,bai,shi,ge;bit thflag=0;void SendData(unsigned char dat) SBUF = dat; /写数据到UART数据寄存器while(TI=0);TI=0;void SendString(char *s) while (*s) /检测字符串结束标志 SendData(*s+); /发送当前字符 void ClearAll(unsigned char *p) char n; for(n=0;n0;x-) for(y=10000;y0;y-);/*-*/void main(void) P21=1; /初始化LED21灭 P22=1; /初始化LED22灭 Shangxian=500; Xiaxian=100;/SCON = 0x50; /8位可变波特率 AUXR = 0x40; /定时器1为1T模式TMOD = 0x00; /定时器1为模式0(16位自动重载)TL1 = (65536 - (FOSC/4/BAUD); /设置波特率重装值 TH1 = (65536 - (FOSC/4/BAUD)8;TR1 = 1; /定时器1开始启动 ES = 1; /使能串口中断/ ADC_CONTR|=0X80;delay(1);P1ASF=0x04; /P12为模拟量输入口ADC_CONTR=0x82;CLK_DIV|=0x20;delay(1);/TH0= (65536-50000)/256; /定时50msTL0= (65536-50000)%256; /定时50msTR0=1;/使能定时器0ET0= 1;/使能定时器0中断time0count=0;EA = 1; /开总中断/ while(1) if(thflag)thflag=0;ADC_CONTR|=0X08;/启动转换while(!(ADC_CONTR&0x10);ADC_CONTR&=0xE7; /转换结束标志位清零dataL=ADC_RESL;dataH=ADC_RES&0x03;Volut=(dataH*256+dataL); qian =Volut/1000 +48;bai=Volut/100%10+48;shi=Volut/10%10+48;ge=Volut%10+48;SendData(qian); SendData(bai);SendData(shi); SendData(ge);SendData( ); /*-定时器0 中断服务程序-*/ void T0_ISR (void) interrupt 1 i=0; thflag=1; time0count+; if(time0count=10) P23=P23;time0count=0; if(VolutShangxian) P21=P21; else if(VolutXiaxian) P22=P22; else P21=1;P22=1; /*-UART 中断服务程序-*/void Uart() interrupt 4 if (RI) RI=0; Recievem=SBUF; m+; if(m=4) unsigned int tempp=(Recieve1-48)*100+(Recieve2-48)*10+(Recieve3-48); if(Recieve0=r) Shangxian=tempp; SendString(n设置上限为：);SendData(Recieve1);SendData(Recieve2);SendData(Recieve3);SendData(n); if(Recieve0=d) Xiaxian=tempp; SendString(n设置下限为：