hai duddy,
The following is the rtc program i have an doubt in this program that why we are giving for hours sendi2c(0x02);//////for minutes sendi2c(0x01);////for seconds sendi2c(0x00);//////date sendi2c(0x04);/////month sendi2c(0x05);//////year sendi2c(0x07);///////
// RTC Interface with PIC 16F877A:
#include<pic.h>
void portconfig();
void sendi2c(char x);
char receivei2c();
void start();
void stop();
void rpstart();
void delay();
void lcd_cmd();
void cmd(char , char );
//void lcd_data(char);
char arr[ ]="TIME : : : .";
char arr1[ ]="DATE : – – . ";
void lcd_con(int );
void time();
void date();
int conv(int i);
void rtc_write();
void rtc_read();
int h,y;
void main()
{
int h,y,D2;
portconfig();
ADCON1=0X07;
lcd_cmd();
SSPCON=0X38;
SSPCON2=0X00;
SSPSTAT=0X80;
SSPADD=9;
cmd(0X80,0);
for(h=0;arr[h]!=' ';h++)
{
cmd(arr[h],1);
}
cmd(0XC0,0);
for(h=0;arr1[h]!=' ';h++)
{
cmd(arr1[h],1);
}
while(1)
{
time();
date();
//cmd(0X01,0);
//cmd(0X80,0);
//rtc_write();
//rtc_read();
}
}
//void rtc_write()
//{
//start();
//sendi2c(0XD0);
//sendi2c(0X0F);
//sendi2c('a');
//stop();
//}
//void rtc_read()
//{
//start();
//sendi2c(0xD0);
//sendi2c(0X0F);
//rpstart();
//sendi2c(0xD1);
//y=receivei2c();
//stop();
////lcd_con(y);
////cmd(0x89,0);
//}
void portconfig()
{
TRISB=0X00;
TRISE=0X00;
PORTB=0X00;
PORTE=0X00;
TRISD=0;
PORTD=0;
TRISC3=1;
TRISC4=1;
}
void lcd_cmd()
{
cmd(0x38,0);
cmd(0x0C,0);
cmd(0x06,0);
cmd(0x01,0);
cmd(0x80,0);
delay();
}
void cmd(char d, char e)
{
RE0=e;
RE1=0;
RE2=1;
PORTB=d;
delay();
RE2=0;
}
void time()
{
//Hours
start();
sendi2c(0xD0);
sendi2c(0x02);
rpstart();
sendi2c(0xD1);
y=receivei2c();
stop();
lcd_con(y);
cmd(0x86,0);
//Minutes
start();
sendi2c(0xD0);
sendi2c(0x01);
rpstart();
sendi2c(0xD1);
y=receivei2c();
stop();
lcd_con(y);
cmd(0x89,0);
//Seconds
start();
sendi2c(0xD0);
rpstart();
sendi2c(0xD1);
y=receivei2c();
stop();
lcd_con(y);
cmd(0x8C,0);
}
void date()
{
//DATE
start();
sendi2c(0xD0);
sendi2c(0x04);
//stop();
rpstart();
//start();
sendi2c(0xD1);
y=receivei2c();
stop();
lcd_con(y);
cmd(0xC6,0);
//MONTH
start();
sendi2c(0xD0);
sendi2c(0x05);
rpstart();
sendi2c(0xD1);
y=receivei2c();
stop();
lcd_con(y);
cmd(0xC9,0);
//Year
start();
sendi2c(0xD0);
sendi2c(0x07);
rpstart();
sendi2c(0xD1);
y=receivei2c();
stop();
lcd_con(y);
cmd(0xCC,0);
}
void lcd_con(int i)
{
int D1,D2;
int temp;
temp=i;
i=(((temp&0X7F)>>4)*10+(temp&0X0F));
D1=i/10;
D2=i%10;
cmd(D1+48,1);
cmd(D2+48,1);
}
void delay()
{
int j;
for(j=0;j<500;j++);
}
char receivei2c()
{
SSPIF=0;
RCEN=1;
char rc;
while(SSPIF==0);
SSPIF=0;
rc=SSPBUF;
return rc;
}
void rpstart()
{
delay();
RSEN=1;
while(!SSPIF);
SSPIF=0;
}
void start()
{
delay();
SEN=1;
while(!SSPIF);
SSPIF=0;
}
void sendi2c(char x)
{
delay();
SSPBUF=x;
while(!SSPIF);
SSPIF=0;
}
void stop()
{
delay();
PEN=1;
while(!SSPIF);
SSPIF=0;
}