PIC18f4550 interface with EEPROM 93c56 using SPI

[sandippatelec]

Hi,
I am trying to interface AT93c56 EEPROM to 18F4550.i'm using MCC18 compiler. The EEPROM is wired for x8 configuration. The Problem with it is
Every time I read EEPROM it returns 0xff only.
My code is as below..
If any one knows the solution plz Help me..

#include<p18f4550.h>
#include<spi.h>

#define READ 0xc0 /* 1 10 A8 A7A6A5A4 A3A2A1A0 */
#define EWEN 0x98 /* 1 001 1XXX XXXX */
#define WRITE 0xa0 /* 1 01 A8 A7A6A5A4 A3A2A1A0 */

//#define READ 0x06 /* 1 10 A8 A7A6A5A4 A3A2A1A0 */
//#define EWEN 0x13 /* 1 001 1XXX XXXX */
//#define WRITE 0x05 /* 1 01 A8 A7A6A5A4 A3A2A1A0 */


#define lcd_data PORTD
#define RS PORTEbits.RE0
#define EN PORTEbits.RE1

#define CS PORTAbits.RA5

void msdelay(unsigned int y)
{
unsigned int x;
T0CON = 0x00;
for(x=0;x<y;x++)
{
TMR0H = 0xF6;
TMR0L = 0x3C;
T0CONbits.TMR0ON = 1;
while(INTCONbits.TMR0IF == 0);
INTCONbits.TMR0IF = 0;
T0CONbits.TMR0ON = 0;
}

}
void command(unsigned char z)
{
RS=0;
EN=1;
lcd_data = z;
EN=0;
msdelay(200);

}

void print(unsigned char y)
{
RS=1;
EN=1;
lcd_data = y;
EN=0;
msdelay(100);

}

void main()
{
unsigned char x;
ADCON1 = 0x0f;

TRISB = 0x01;
TRISC = 0x00;
TRISA = 0x00;

TRISE = 0x00;
TRISD = 0x00;

command(0x38);
command(0x0C);
command(0x01);
command(0x06);

OpenSPI(SPI_FOSC_64,MODE_00,SMPMID);

CS = 1;
msdelay(5);
WriteSPI(EWEN);
msdelay(10);
CS = 0;

msdelay(10);

CS = 1;
msdelay(5);

WriteSPI(WRITE);
msdelay(5);

WriteSPI(0x00);
msdelay(5);
WriteSPI(0x50);
msdelay(5);

WriteSPI('R');
msdelay(5);
CS = 0;

msdelay(20);

CS = 1;
msdelay(5);

WriteSPI(READ);
msdelay(5);

WriteSPI(0x00);
msdelay(5);
WriteSPI(0x50);
msdelay(5);

x = getcSPI();
msdelay(5);
print(x);
CS = 0;
msdelay(5);

while(1);
}

 

[lord anubis]

What about the SK speed? Is that conform the Datasheet?

 

[sandippatelec]

I'm using 20 Mhz..
i have select F0sc/64..
This code is working properly on Proteus But its not working on Hardware..

The main program execution didn't come out from Read function..