RTC using DS1307 with pic18f452 and pic18compiler.

i want to display the date and time to LCD....

i dont know to how to read and write I2C... the below program is executed...but output is not worked
pls somebody help me...or give some code based on pic18 compiler...

#include<p18f458.h>OR <P18F452.h>
unsigned char SPI(unsigned char mybyte);
void TRANS(unsigned char mychar);
void main()
{
int c;
SSPSTAT=0x00;
SSPCON1=0x22;
TRISC=0x00;
TRISCbits.TRISC4=1;
TRISCbits.TRISC7=1;
TXSTA=0x20;
SPBRG=15;
RCSTAbits.SPEN=1;
TRANS(0x0A);
TRANS(0X0D);
while(1)
{
PORTCbits.RC2=1; //start single byte write
SPI(0x8F);
SPI(0x00);
PORTCbits.RC2=0; // end single byte write
PORTCbits.RC2=1;
SPI(0x80);
c=SSPBUF;
SPI(0x55);
SPI(0x58);
SPI(0x16);
SPI(0x03);
SPI(0x19);
SPI(0x10);
SPI(0x05);
PORTCbits.RC2=0;
PORTC=c;
}
TRANS(0x0D);
}
unsigned char SPI(unsigned char mybyte)
{
SSPBUF=mybyte;
while(!SSPSTATbits.BF);
return SSPBUF;
}

void TRANS(unsigned char mychar)
{
while(!PIR1bits.TXIF);
TXREG=mychar;
}

thanks

jai

jaya krishna said:

i want to display the date and time to LCD....

i dont know to how to read and write I2C... the below program is executed...but output is not worked
pls somebody help me...or give some code based on pic18 compiler...

#include<p18f458.h>OR <P18F452.h>
unsigned char SPI(unsigned char mybyte);
void TRANS(unsigned char mychar);
void main()
{
int c;
SSPSTAT=0x00;
SSPCON1=0x22;
TRISC=0x00;
TRISCbits.TRISC4=1;
TRISCbits.TRISC7=1;
TXSTA=0x20;
SPBRG=15;
RCSTAbits.SPEN=1;
TRANS(0x0A);
TRANS(0X0D);
while(1)
{
PORTCbits.RC2=1; //start single byte write
SPI(0x8F);
SPI(0x00);
PORTCbits.RC2=0; // end single byte write
PORTCbits.RC2=1;
SPI(0x80);
c=SSPBUF;
SPI(0x55);
SPI(0x58);
SPI(0x16);
SPI(0x03);
SPI(0x19);
SPI(0x10);
SPI(0x05);
PORTCbits.RC2=0;
PORTC=c;
}
TRANS(0x0D);
}
unsigned char SPI(unsigned char mybyte)
{
SSPBUF=mybyte;
while(!SSPSTATbits.BF);
return SSPBUF;
}

void TRANS(unsigned char mychar)
{
while(!PIR1bits.TXIF);
TXREG=mychar;
}

thanks

jai

Click to expand...

no routine for LCD in your code

https://adf.ly/4116/pic-lesson-set-time-and-date

look at this site for reference

#define HD44780...what is this i didn't get this..pls can u tel me...

thank you...

jaya krishna said:

#define HD44780...what is this i didn't get this..pls can u tel me...

thank you...

Click to expand...

https://en.wikipedia.org/wiki/Hitachi_HD44780_LCD_controller

its lcd controller(in build) used in that project

and from your code it looks that you doing programming to display date time on hyper terminal not on lcd why you don't have lcd routine in your code

first i try to display in hyper terminal but it not displaying...so i want try to display on LCD...its possible....i m beginner ...pls help me...

http://www.sixca.com/micro/pic/ds1307/

for your reference see this link and if you newbie then try first learn basic programming i am assuming that you aware with SPI protocol and I2C also

how to change 24 hour to 12 hour can u help me..... thanks....


#include "16F877A.h"
#use delay(clock=4000000)
#fuses NOWDT,XT, NOPUT, NOPROTECT
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)
#include "ds1307.c"

void main(void)
{
int8 sec,min,hour,day,date,month,year,pm;

delay_ms(50);
init_ds1307(); // initial DS1307
//sec=read_ds1307(0);
//write_ds1307(0,sec & 0x7F); // enable oscillator(bit 7 =0)
write_ds1307(2,hour & 0x3F); // extract the hour in BCD


while(true)
{
sec=read_ds1307(0); // read second
min=read_ds1307(1); // read minute

hour=read_ds1307(2); // read hour
day=read_ds1307(3); // read day
date=read_ds1307(4); // read date
month=read_ds1307(5); // read month
year=read_ds1307(6); // read year
putc(0x0c);

printf("Time : %X:%X:%X\r\n",hour,min,sec);
printf("Day : %02X\r\n",day);
printf("Date : %X/%X/%X\r\n",date,month,year);
delay_ms(500);
}
}
#define DS1307_SDA PIN_C4
#define DS1307_SCL PIN_C3
#use i2c(master, sda=DS1307_SDA, scl=DS1307_SCL)




//==========================
// initial DS1307
//==========================
void init_DS1307()
{
output_float(DS1307_SCL);
output_float(DS1307_SDA);

}
//==========================
// write data one byte to
// DS1307
//==========================
void write_DS1307(byte address, BYTE data)
{
short int status;
i2c_start();
i2c_write(0xd0);

i2c_write(address);
i2c_write(data);
i2c_stop();
i2c_start();
status=i2c_write(0xd0);
while(status==1)
{
i2c_start();
status=i2c_write(0xd0);
}
}
//==========================
// read data one byte from DS1307
//==========================
BYTE read_DS1307(byte address)
{
BYTE data;
i2c_start();
i2c_write(0xd0);
i2c_write(address);
i2c_start();
i2c_write(0xd1);
data=i2c_read(0);
i2c_stop();
return(data);
}


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