Real time clock programming with 89C52

[14dhrumit]

I am trying to program RTC but i am having a problem... I am making a project in which i am using RTC interfaced with microcontroller for opening a door(say in morning) and closing a door(say in evening)... And i am not able to program it. Can anyone get me the code of this in .asm or .c???

 

[sunautomation]

#include<reg51.h>

//Function declarations
void cct_init(void);
void delay(int);
void lcdinit(void);
void WriteCommandToLCD(int);
void WriteDataToLCD(char);
void ClearLCDScreen(void);
void InitTimer0(void);
void UpdateTimeCounters(void);
void DisplayTimeToLCD(unsigned int,unsigned int,unsigned int);

//*******************
//Pin description
/*
P2.4 to P2.7 is data bus
P1.0 is RS
P1.1 is E
*/
//********************

// Defines Pins
sbit RS = P1^0;
sbit E = P1^1;

// Define Clock variables
unsigned int usecCounter = 0;
unsigned int msCounter = 0;
unsigned int secCounter = 0;
unsigned int minCounter = 0;
unsigned int hrCounter = 0;



// ***********************************************************
// Main program
//
void main(void)
{
cct_init(); // Make all ports zero
lcdinit(); // Initilize LCD
InitTimer0(); // Start Timer0

while(1)
{
if( msCounter == 0 ) // msCounter becomes zero after exact one sec
{
DisplayTimeToLCD(hrCounter, minCounter, secCounter); // Displays time in HH:MM:SS format
}

UpdateTimeCounters(); // Update sec, min, hours counters
}
}


void cct_init(void)
{
P0 = 0x00; //not used
P1 = 0x00; //not used
P2 = 0x00; //used as data port
P3 = 0x00; //used for generating E and RS
}


void InitTimer0(void)
{
TMOD &= 0xF0; // Clear 4bit field for timer0
TMOD |= 0x02; // Set timer0 in mode 2

TH0 = 0x05; // 250 usec reloading time
TL0 = 0x05; // First time value

ET0 = 1; // Enable Timer0 interrupts
EA = 1; // Global interrupt enable

TR0 = 1; // Start Timer 0
}


void Timer0_ISR (void) interrupt 1 // It is called after every 250usec
{
usecCounter = usecCounter + 250; // Count 250 usec

if(usecCounter==1000) // 1000 usec means 1msec
{
msCounter++;
usecCounter = 0;
}

TF0 = 0; // Clear the interrupt flag
}


void UpdateTimeCounters(void)
{
if (msCounter==1000)
{
secCounter++;
msCounter=0;
}

if(secCounter==60)
{
minCounter++;
secCounter=0;
}

if(minCounter==60)
{
hrCounter++;
minCounter=0;
}

if(hrCounter==24)
{
hrCounter = 0;
}
}


void DisplayTimeToLCD( unsigned int h, unsigned int m, unsigned int s ) // Displays time in HH:MM:SS format
{
ClearLCDScreen(); // Move cursor to zero location and clear screen

// Display Hour
WriteDataToLCD( (h/10)+0x30 );
WriteDataToLCD( (h%10)+0x30 );

//Display ':'
WriteDataToLCD(':');

//Display Minutes
WriteDataToLCD( (m/10)+0x30 );
WriteDataToLCD( (m%10)+0x30 );

//Display ':'
WriteDataToLCD(':');

//Display Seconds
WriteDataToLCD( (s/10)+0x30 );
WriteDataToLCD( (s%10)+0x30 );
}


void delay(int a)
{
int i;
for(i=0;i<a;i++); //null statement
}

void WriteDataToLCD(char t)
{
RS = 1; // This is data

P2 &= 0x0F; // Make P2.4 to P2.7 zero
P2 |= (t&0xF0); // Write Upper nibble of data

E = 1; // => E = 1
delay(150);
E = 0; // => E = 0
delay(150);

P2 &= 0x0F; // Make P2.4 to P2.7 zero
P2 |= ((t<<4)&0xF0);// Write Lower nibble of data

E = 1; // => E = 1
delay(150);
E = 0; // => E = 0
delay(150);
}


void WriteCommandToLCD(int z)
{
RS = 0; // This is command

P2 &= 0x0F; // Make P2.4 to P2.7 zero
P2 |= (z&0xF0); // Write Upper nibble of data

E = 1; // => E = 1
delay(150);
E = 0; // => E = 0
delay(150);

P2 &= 0x0F; // Make P2.4 to P2.7 zero
P2 |= ((z<<4)&0xF0);// Write Lower nibble of data

E = 1; // => E = 1
delay(150);
E = 0; // => E = 0
delay(150);
}

void lcdinit(void)
{
///////////// Reset process from datasheet /////////
delay(15000);

P2 &= 0x0F; // Make P2.4 to P2.7 zero
P2 |= (0x30&0xF0); // Write 0x3

E = 1; // => E = 1
delay(150);
E = 0; // => E = 0
delay(150);

delay(4500);

P2 &= 0x0F; // Make P2.4 to P2.7 zero
P2 |= (0x30&0xF0); // Write 0x3

E = 1; // => E = 1
delay(150);
E = 0; // => E = 0
delay(150);

delay(300);

P2 &= 0x0F; // Make P2.4 to P2.7 zero
P2 |= (0x30&0xF0); // Write 0x3

E = 1; // => E = 1
delay(150);
E = 0; // => E = 0
delay(150);

delay(650);

P2 &= 0x0F; // Make P2.4 to P2.7 zero
P2 |= (0x20&0xF0); // Write 0x2

E = 1; // => E = 1
delay(150);
E = 0; // => E = 0
delay(150);

delay(650);

/////////////////////////////////////////////////////
WriteCommandToLCD(0x28); //function set
WriteCommandToLCD(0x0c); //display on,cursor off,blink off
WriteCommandToLCD(0x01); //clear display
WriteCommandToLCD(0x06); //entry mode, set increment
}

void ClearLCDScreen(void)
{
WriteCommandToLCD(0x01); // Clear screen command
delay(1000);
}

 

[14dhrumit]

Sir, I am hoping that it will work perfectly... Are you sure that the result will be expected???..