#include<reg51.h>
#include<stdio.h>
#include<avrio.h>
#include<keypad.h>
sfr ROW=0x80; //assigning PORT-0 to read rows
sfr COL=0xA0; //assigning PORT-2 to read colomns
sfr ldata=0x90; //assigning PORT-1 for LCD data
sbit rs=P3^0;
sbit rw=P3^1;
sbit en=P3^2;
sbit busy=P1^7;
void lcdcmd(unsigned char value) ;
void lcddata(unsigned char value);
void lcdready(void) ;
void printstring(unsigned char ch[]) ;
void LCDclear(void);
void msdelay(unsigned int value) ;
int keypad();
void timer(unsigned int msec);
void main()
{
unsigned int i,k;
lcdcmd(0x38);
lcdcmd(0x0F);
lcdcmd(0x06);
lcdcmd(0x01);
while(1)
{
P0=0xff;
P1=0xff;
P2=0xff;
P3=0xff;
PCON |= 0x01;
do
{
k=keypad();
}
while(k!='A');
switch(k)
{
case 'A' :while(1) //CASE 1
{
printstring("idle mode exited");
msdelay(200);
main();
}
}
}}
/* sending commands to LCD display to act in command mode */
void lcdcmd(unsigned char value)
{
lcdready();
ldata=value;
rs=0;
rw=0;
en=1;
msdelay(10);
en=0;
}
/* sending commnad to LCD to display characters*/
void lcddata(unsigned char value)
{
lcdready();
ldata=value;
rs=1;
rw=0;
en=1;
msdelay(10);
en=0;
}
/* checking LCD buffer for free */
void lcdready(void)
{
busy=1;
rs=0;
rw=1;
if(busy==1)
{
en=0;
msdelay(1);
en=1;
}
}
void printstring(unsigned char ch[])
{
unsigned int i;
for(i=0;ch[i]!='\0';i++)
lcddata(ch[i]);
}
/* generating delay*/
void msdelay(unsigned int value)
{
unsigned int i,j;
for(i=0;i<value;i++)
for(j=0;j<500;j++);
}
void locklong(unsigned int value)
{
unsigned int i,j;
for(i=0;i<value;i++)
for(j=0;j<10000;j++);
}
void LCDclear(void)
{
lcdcmd(0x01);
}
int keypad()
{
unsigned char dat[4][4]={'1','2','3','A', // assigning key matrix
'4','5','6','B',
'7','8','9','-',
'C','0','=','+',
};
unsigned char colloc,rowloc;
COL=0xFF;
ROW=0x00;
rs=0;
rw=0;
en=0;
busy=0;
/* setting LCD screen*/
ldata=0x00;
lcdcmd(0x38);
lcdcmd(0x0E);
lcdcmd(0x06);
while(1)
{
/* reading character from keyboard */
do
{
ROW=0x00;
colloc=COL;
colloc&=0x0F;
}while(colloc!=0x0F);
do
{
do
{
msdelay(10);
colloc=COL;
colloc&=0x0F;
}while(colloc==0x0F);
msdelay(10);
colloc=COL;
colloc&=0x0F;
}while(colloc==0x0F);
while(1)
{
ROW=0xFE; msdelay(5);
colloc=COL;
colloc&=0x0F;
if(colloc!=0x0F)
{
rowloc=0;
break;
}
ROW=0xFD; msdelay(5);
colloc=COL;
colloc&=0x0F;
if(colloc!=0x0F)
{
rowloc=1;
break;
}
ROW=0xFB; msdelay(5);
colloc=COL;
colloc&=0x0F;
if(colloc!=0x0F)
{
rowloc=2;
break;
}
ROW=0xF7; msdelay(5);
colloc=COL;
colloc&=0x0F;
if(colloc!=0x0F)
{
rowloc=3;
break;
}
}
if(colloc==0x0E)
return(dat[rowloc][0]);
else if(colloc==0x0D)
return(dat[rowloc][1]);
else if(colloc==0x0B)
return(dat[rowloc][2]);
else
return(dat[rowloc][3]);
}
}
void timer(unsigned int msec) // Function for timer
{
unsigned int i;
for(i=0;i<msec;i++)
{
TMOD=0x20; // Mode2
TH1=0xD1;
TL1=0xFF;
TR1=1;
while(TF1==0);
TF1=0;
TR1=0;
}
}As said before i`m not familiar with your controller.
Yesyou say it is low. But i am still unsure. It makes a big difference in current consuption whether the pin is truely LOW or HIGH IMPEDANCE.
Sorry. Only you can see what is printed on the LCD.
---(
As said before i´m not familiar with your microcontroller.
