DS1306 interface with pic18f452 by using SPI protocol

[selvakumar c]

hi all,

i am trying to use DS1306 with PIC18F452,and READ the data from DS1306- display the result into LCD display


from DS1306 datasheet i got clear idea that there are two mode of operation with DS1306

that are

1.SPI mode(4-wire mode)
2.3-wire mode

i used SPI mode(SERMODE to vcc)

vcc2 to Ground
vcc1 to +5v
vccif to +sv
vbat to 3v lithium battery
X1,X2 to 32.768khz crystal
SERMODE to +5v
CE to RC2
SCLK to RC3(SCLK)
SDI to RC5(SDO)
SDO to RC4(SDI)

INT0,INT1,1hz,32khz -no connection


here is my sample code..(for read the data,display second only)



#include<pic18.h>
#include<htc.h>
unsigned char spi(unsigned char);

__CONFIG(1, OSC_HS );
__CONFIG(2, PWRT_ON & BOR_OFF & WDT_OFF);
__CONFIG(4, STVR_ON & LVP_OFF & DEBUG_OFF);

#define _XTAL_FREQ 12000000
#define rs RD0
#define rw RD1
#define en RD2
#define ldata PORTB


void delay()
{
unsigned int i,j;
for(i=0;i<=100;i++)
for(j=0;j<=100;j++);
}

lcd_cmd(unsigned char y)
{
ldata=y;
rs=0;
rw=0;
en=1;
delay();
en=0;
}

lcd_data(unsigned char y)
{
ldata=y;
rs=1;
rw=0;
en=1;
delay();
en=0;
}

lcd_init()
{
lcd_cmd(0x38);
lcd_cmd(0x0c);
lcd_cmd(0x01);
lcd_cmd(0x80);
}

void adc_calc1(unsigned int k)
{
unsigned int L,M;

L=k%10; k=k/10;
M=k;

lcd_cmd(0x83);
lcd_data(48+M);
lcd_data(48+L);
}
unsigned char spi(unsigned char k)
{
SSPBUF=k;
while(!BF);
adc_calc1(SSPBUF);
}

void main()
{
unsigned int i;
unsigned int dinu[];

SSPSTAT=0x00;
SSPCON1=0x22;

TRISC=0;
TRISC4=1;

ADCON1=0x0f;

TRISB=0x00;
TRISD=0x00;

PORTB=0x00;

lcd_init();
delay();


while(1)
{
RC2=1;
delay();
spi(0x0f); //command for controll resistor to read
spi(0x00); // address for read second
__delay_ms(50);
RC2=0;
}
}


but i can't get proper output.i get output like 00,02,08,I5

I replaced the crystal 32.768hz 3 times but i count't get output correctly


Could someone tell me what kind of communication must I use and how have I to configure the registers SSPCON and SSPSTAT


I thing the problem comes from

1.steps sequence used in reading data
2.display the result into lcd

please any one help me to solve my problems
or
any sample program..