数字电压表单片机源程序 -

#include "reg52.h"
#include "intrins.h"
#include "stdio.h"
#define uchar unsigned char
#define RS_CLR RS=0
#define RS_SET RS=1
#define RW_CLR RW=0
#define RW_SET RW=1
#define EN_CLR EN=0
#define EN_SET EN=1
sbit ST=P3^4;
sbit EOC=P3^5;
sbit OE=P3^6;
sbit ALE=P3^7;
sbit ADDC=P2^1;
sbit ADDB=P2^2;
sbit ADDA=P2^3;
sbit RS = P2^4;
sbit RW = P2^5;
sbit EN = P2^6;
sbit KEY1=P2^0;
sbit KEY2=P2^7;
sbit KEY4=P3^2;
uchar num=0;
uchar temp[20];
float Voltage;
void DelayUs2x(unsigned char t)
{
while(--t);
}
void DelayMs(unsigned char t)
{
while(t--)
{
DelayUs2x(245);
DelayUs2x(245);
}
}
void delay(uchar i)
{
uchar j;
while(i--)
{
for(j=125;j>0;j--);
}
}
bit LCD_Check_Busy(void)
{
P0=0xFF;
RS_CLR;
RW_SET;
EN_CLR;
_nop_();
EN_SET;
return (bit)(P0 & 0x80);
}
void LCD_Write_Com(unsigned char com)
{
DelayMs(5);
RS_CLR;
RW_CLR;
EN_SET;
P0=com;
_nop_();
EN_CLR;
}
void LCD_Write_Data(unsigned char Data)
{
//while(LCD_Check_Busy()); //忙则等待
DelayMs(5);
RS_SET;
RW_CLR;
EN_SET;
P0=Data;
_nop_();
EN_CLR;
}
void LCD_Clear(void)
{
LCD_Write_Com(0x01);
DelayMs(5);
}
void LCD_Write_String(unsigned char x,unsigned char y,unsigned char *s)
{
if (y == 0)
{
LCD_Write_Com(0x80 + x); //表示第一行
}
else
{
LCD_Write_Com(0xC0 + x); //表示第二行
}
while (*s)
{
LCD_Write_Data( *s);
s ++;
}
}
void LCD_Write_Char(unsigned char x,unsigned char y,unsigned char Data)
{
if (y == 0)
{
LCD_Write_Com(0x80 + x);
}
else
{
LCD_Write_Com(0xC0 + x);
}
LCD_Write_Data( Data);
}
void LCD_Init(void)
{
LCD_Write_Com(0x38); /*显示模式设置*/
DelayMs(5);
LCD_Write_Com(0x38);
DelayMs(5);
LCD_Write_Com(0x38);
DelayMs(5);
LCD_Write_Com(0x38);
LCD_Write_Com(0x0C); /*显示开及光标设置*/
LCD_Write_Com(0x06); /*显示光标移动设置*/
LCD_Write_Com(0x01); /*显示清屏*/
}
unsigned char Read_AD()
{
uchar temp=0;
while(EOC==0);
OE=1;
temp=P1;
DelayMs(1);
OE=0;
return temp;
}
void UartInit(void) //2400bps@12MHz
{
PCON &= 0x7f;
SCON = 0x50;
AUXR &= 0xbf;
AUXR &= 0xfe;
TMOD &= 0x0f;
TMOD |= 0x20;
TL1 = 0xF3;
TH1 = 0xF3;
ET1 = 0;
TR1 = 1;
}
void SendByte(unsigned char dat)
{
SBUF = dat;
while(!TI);
TI = 0;
}
void SendStr(unsigned char *s)
{
while(*s!='\0')// \0 表示字符串结束标志，
//通过检测是否字符串末尾
{
SendByte(*s);
DelayUs2x(8);
s++;
}
}
//unsigned char keyscan()
//{
//
// if(KEY1==0)
// {
// ALE=1;
// ADDA=0;
// ADDB=0;
// ADDC=0;
// ALE=0;
// num=Read_AD();
// Voltage=(float)num*5.0/256;
// sprintf(temp,"V1:%3.2f",Voltage);
// LCD_Write_String(4,0,temp);
// }
// else if(KEY2==0)
// {
// ALE=1;
// ADDA=1;
// ADDB=0;
// ADDC=0;
// ALE=0;
// num=Read_AD();
// Voltage=(float)num*5.0/256;
// sprintf(temp,"V2:%3.2f",Voltage);
// LCD_Write_String(4,0,temp);
// }
// else if(KEY3==0)
// {
// ALE=1;
// ADDA=0;
// ADDB=1;
// ADDC=0;
// ALE=0;
// num=Read_AD();
// Voltage=(float)num*5.0/256;
// sprintf(temp,"V3:%3.2f",Voltage);
// LCD_Write_String(4,0,temp);
// }
//}
unsigned char keyscan()
{
if(KEY1==0)
{
while(1)
{
ST=1;
ST=0;
ALE=1;
ADDA=0;
ADDB=0;
ADDC=0;
ALE=0;
num=Read_AD();
Voltage=(float)num*10.0/256;
sprintf(temp,"V1:%4.2f\n",Voltage);
LCD_Write_String(0,0,temp);
ST=1;
ST=0;
ALE=1;
ADDA=0;
ADDB=0;
ADDC=0;
ALE=0;
num=Read_AD();
Voltage=(float)num*10.0/256;
sprintf(temp,"V1:%4.2f\n",Voltage);
LCD_Write_String(0,0,temp);
SendStr(temp);
DelayMs(2000);
DelayMs(2000);
DelayMs(2000);
DelayMs(2000);
ST=1;
ST=0;
ALE=1;
ADDA=1;
ADDB=0;
ADDC=0;
ALE=0;
num=Read_AD();
Voltage=(float)num*10.0/256;
sprintf(temp,"V2:%4.2f\n",Voltage);
LCD_Write_String(9,0,temp);
ST=1;
ST=0;
ALE=1;
ADDA=1;
ADDB=0;
ADDC=0;
ALE=0;
num=Read_AD();
Voltage=(float)num*10.0/256;
sprintf(temp,"V2:%4.2f\n",Voltage);
LCD_Write_String(9,0,temp);
SendStr(temp);
DelayMs(2000);
DelayMs(2000);
DelayMs(2000);
DelayMs(2000);
ST=1;
ST=0;
ALE=1;
ADDA=0;
ADDB=1;
ADDC=0;
ALE=0;
num=Read_AD();
Voltage=(float)num*10.0/256;
sprintf(temp,"V3:%4.2f\n",Voltage);
LCD_Write_String(0,1,temp);
ST=1;
ST=0;
ALE=1;
ADDA=0;
ADDB=1;
ADDC=0;
ALE=0;
num=Read_AD();
Voltage=(float)num*10.0/256;
sprintf(temp,"V3:%4.2f\n",Voltage);
LCD_Write_String(0,1,temp);
SendStr(temp);
DelayMs(2000);
DelayMs(2000);
DelayMs(2000);
DelayMs(2000);
ST=1;
ST=0;
ALE=1;
ADDA=1;
ADDB=1;
ADDC=0;
ALE=0;
num=Read_AD();
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