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| #include<reg51.h>
#define p0 P0
#define p2 P2
sbit c1=P2^4;
sbit c2=P2^5;
sbit c3=P2^6;
sbit c4=P2^7;
sbit r1=P2^0;
sbit r2=P2^1;
sbit r3=P2^2;
sbit r4=P2^3;
sfr c=0x90;
sbit rs=P3^7;
sbit rw=P3^6;
sbit en=P3^5;
unsigned char position=128,i=0;
int check_again[10]={0,0,0,0,0,0,0,0,0,0};
void lcd();
void keypad();
void num_check(int a,int b) ;
void lcd_d( char val);
void lcd_in( char val);
void wait(int j)
{
long int i;
for(i=0;i<j;i++);
}
void lcd_in(unsigned char val)
{
c=val;
rs= 0;
rw=0;
en=1;
wait(10);
en=0;
return;
}
void lcd_d(unsigned char val)
{
lcd_in(0x0f);
wait(10);
c= val;
rs= 1;
rw=0;
en=1;
wait(10);
en=0;
return;
}
void num_check(int a,int b) //Check function
{
int j;
for(j=0;j<10;j++)
{
if(j!=a)
{
check_again[j]=0;
}
}
if(check_again[a]==3)
check_again[a]=0;
check_again[11]=1;
check_again[12]=1;
}
void display(int a,int b) // Display function
{
switch(b)
{
case 1:
{
switch(a)
{
case 1:{
if(check_again[a]>1)
i--;
lcd_in(position+i);
lcd_d('a');
wait(5000);
// num_check(1 ,check_again[1]);
break;
}
} }
case 2:
{
switch(a)
{
case 1:{
if(check_again[a]>1)
i--;
lcd_in(position+i);
lcd_d('b');
wait(5000);
// num_check(1 ,check_again[1]);
break;
}
}
}
case 3:
{
switch(a)
{
case 1:{
if(check_again[a]>1)
i--;
lcd_in(position+i);
lcd_d('c');
wait(5000);
// num_check(1 ,check_again[1]);
break;
}
}
}
}
}
void keypad()
{
if (c4=0,c2=c3=c1=1,r4==0)
{
p0=0xf0;
display(1);
lcd_in(0x0c);
}
}
void main()
{
p2=0x0f;
lcd();
while(1)
{
p0=0xfe;
keypad();
wait(5000);
//p0=0xfd;
//keypad();
//wait(5000);
//p0=0xfb;
//keypad();
//wait(5000);
//p0=0xf7;
//keypad();
//wait(5000);
}
}
void lcd()
{
lcd_in(0x38);
wait(250);
lcd_in(0x0e);
wait(250);
lcd_in(0x01);
wait(250);
lcd_in(0x06);
wait(250);
lcd_in(0x86);
wait(250);
lcd_in(0x80);
wait(250);
} |