This Project will demonstrate the real time clock interface with PIC 16F877A
To do this project we need following software:
CODE
//DS1307 Real Time Clock with PIC16F877A
// LCD module connections
sbit LCD_RS at RD0_bit;
sbit LCD_EN at RD1_bit;
sbit LCD_D4 at RD2_bit;
sbit LCD_D5 at RD3_bit;
sbit LCD_D6 at RD4_bit;
sbit LCD_D7 at RD5_bit;
sbit LCD_RS_Direction at TRISD0_bit;
sbit LCD_EN_Direction at TRISD1_bit;
sbit LCD_D4_Direction at TRISD2_bit;
sbit LCD_D5_Direction at TRISD3_bit;
sbit LCD_D6_Direction at TRISD4_bit;
sbit LCD_D7_Direction at TRISD5_bit;
// End LCD module connections
unsigned char *text, second, second10, minute,
minute10,
hour, hour10, date, date10,
month, month10,
year, year10, day, i = 0;
void
display()
{
//Split data into tow parts
second10 = (second & 0x70) >> 4;
second = second & 0x0F;
minute10 = (minute & 0x70) >> 4;
minute = minute & 0x0F;
hour10 = (hour & 0x30) >> 4;
hour = hour & 0x0F;
date10 = (date & 0x30) >> 4;
date = date & 0x0F;
month10 = (month & 0x10) >> 4;
month = month & 0x0F;
year10 = (year & 0xF0) >> 4;
year = year & 0x0F;
//Display Time
Lcd_Chr(1, 13, second + 48);
Lcd_Chr(1, 12, second10 + 48);
Lcd_Chr(1, 10, minute + 48);
Lcd_Chr(1, 9, minute10 + 48);
Lcd_Chr(1, 7, hour + 48);
Lcd_Chr(1, 6, hour10 + 48);
//Display calendar
Lcd_Chr(2, 7, date + 48);
Lcd_Chr(2, 6, date10 + 48);
Lcd_Chr(2, 10, month + 48);
Lcd_Chr(2, 9, month10 + 48);
Lcd_Chr(2, 15, year + 48);
Lcd_Chr(2, 14, year10 + 48);
}
void
main()
{
LCD_Init();
LCD_Cmd(_LCD_CURSOR_OFF);
LCD_Cmd(_LCD_CLEAR);
LCD_Out(1,1, "REAL TIME CLOCK");
LCD_Out(2,1, "GSM MAHFUZ LIKHON");
delay_ms(2000);
LCD_Cmd(_LCD_CLEAR);
TRISB = 3;
Lcd_Init(); //
Initialize LCD
Lcd_Cmd(_LCD_CLEAR); //
Clear LCD display
Lcd_Cmd(_LCD_CURSOR_OFF); // Turn
cursor off
I2C1_Init(100000); //
initialize I2C at 100KHz
return_:
text = "TIME: : :" ;
Lcd_Out(1, 1, text);
text = "DATE: / /20" ;
Lcd_Out(2, 1, text);
write_value(0, 0); //Reset
seconds and start oscillator
while(1)
{
if(i == 1)
{
Lcd_Cmd(_LCD_CLEAR);
text = "Adjust Minute:";
Lcd_Out(1, 2, text);
minute = minute + minute10 * 10;
while(1){
if (Button(&PORTB, 0, 100, 0)) i++;
if(i!=1){
minute = ((minute/10) << 4) + (minute % 10);
write_value( 1 , minute);
goto return_;}
if (Button(&PORTB, 1, 100, 0)) minute++;
if (minute > 59) minute = 0;
Lcd_Chr(2, 8, (minute/10) + 48);
Lcd_Chr(2, 9, (minute % 10) + 48);}
}
if(i == 2)
{
Lcd_Cmd(_LCD_CLEAR);
text = "Adjust Hour:";
Lcd_Out(1, 2, text);
hour = hour + hour10 * 10;
while(1){
if (Button(&PORTB, 0, 100, 0)) i++;
if(i!=2){
hour = ((hour/10) << 4) + (hour % 10);
write_value( 2 , hour);
goto return_;}
if (Button(&PORTB, 1, 100, 0)) hour++;
if (hour > 23) hour = 0;
Lcd_Chr(2, 8, (hour/10) + 48);
Lcd_Chr(2, 9, (hour % 10) + 48);}
}
if(i == 3)
{
Lcd_Cmd(_LCD_CLEAR);
text = "Adjust Date:";
Lcd_Out(1, 2, text);
date = date + date10 * 10;
while(1){
if (Button(&PORTB, 0, 100, 0)) i++;
if(i!=3){
date = ((date/10) << 4) + (date % 10);
write_value( 4 , date);
goto return_;}
if (Button(&PORTB, 1, 100, 0)) date++;
if (date > 31) date = 1;
Lcd_Chr(2, 8, (date/10) + 48);
Lcd_Chr(2, 9, (date % 10) + 48);}
}
if(i == 4)
{
Lcd_Cmd(_LCD_CLEAR);
text = "Adjust Month:";
Lcd_Out(1, 2, text);
month = month + month10 * 10;
while(1){
if (Button(&PORTB, 0, 100, 0)) i++;
if(i!=4){
month = ((month/10) << 4) + (month % 10);
write_value( 5 , month);
goto return_;}
if (Button(&PORTB, 1, 100, 0)) month++;
if (month > 12) month = 1;
Lcd_Chr(2, 8, (month/10) + 48);
Lcd_Chr(2, 9, (month % 10) + 48);}
}
if(i == 5)
{
Lcd_Cmd(_LCD_CLEAR);
text = "Adjust Year:";
Lcd_Out(1, 2, text);
year = year + year10 * 10;
while(1){
if (Button(&PORTB, 0, 100, 0)) {i++;
if (i > 5) i = 0;}
if(i!=5){
year = ((year/10) << 4) + (year % 10);
write_value( 6 , year);
goto return_;}
if (Button(&PORTB, 1, 100, 0))
year++;
if (year > 99) year = 0;
Lcd_Chr(2, 7, 2 + 48);
Lcd_Chr(2, 8, 0 + 48);
Lcd_Chr(2, 9, (year/10) + 48);
Lcd_Chr(2, 10, (year % 10) + 48);}
}
if (Button(&PORTB, 0, 100, 0)) i++;
display();
}
}
Schematic
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