SPI_EEPROM INTERFACE WITH LPC2114

Hi all,

I had written a code to interface 25c160 (SPI EEPROM) with lpc2114. I used proteus for simulation. But when i was de-bugging my code in keil, S0SPDR register is not taking any values.I am not able to understand what went wrong....
I am attaching my code......
Please guide my way out....

pavan
pavannaidu.v@gmail.com

#include <lpc21xx.h>
#include "spi.h"

unsigned char rd[5];

void spi_init(void)
{
        PINSEL0 = 0X00005500;   //SELECTING SPI MODE
        S0SPCCR = 0X78;                 //100KHZ
    S0SPCR  = 0x20;                     //MASTER MODE WITH 8-BITS PER TRANSFER
        IODIR0  = 0x00000400;   //SET SSEL0 AS OUTPUT;
}


unsigned char spi_tx_rx(unsigned char val)
{
        IOCLR0 = 0X00000080;
        S0SPDR = val;
        while(!(S0SPSR & 0x80));
        S0SPSR = 0X00;
        return S0SPDR;
        IOSET0 = 0X00000080;
}

void spi_write_en(void)
{
         IOCLR0 = 0X00000080;
         spi_tx_rx(WREN);
         wait();
         IOSET0 = 0X00000080;
}
void spi_write(unsigned char *val)
{
        spi_write_en();

        spi_tx_rx(WRITE);
        spi_tx_rx(0X00);        //ADDRESS: HIGHER BYTE
        spi_tx_rx(0X00);        //ADDRESS: LOWER BYTE
        while(*val)
        {
                spi_tx_rx(*val++);
        }

        wait();
}

void spi_read()
{
        int i;

        spi_tx_rx(READ);
        spi_tx_rx(0X00);        //ADDRESS: HIGHER BYTE
        spi_tx_rx(0X00);        //ADDRESS: LOWER BYTE
        for(i=0;i<5;i++)
        {
                rd[i] = spi_tx_rx(0x00);
                wait();
        }


}
/*
void write(unsigned char *dataa)
{
        while(*dataa)
                spi_write(*dataa++);
}

void read(void)
{
        int i;
        spi_read();
        for(i=0;i<5;i++)
        {
                rd[i] = spi_read();
                wait();
        }
}
  */
void wait()
{
        int j;
        for(j=0;j<50000;j++);
}