[ARM] Interfacing of at25f1024 eeprom with lpc2129 microcontroller

[v.s.n.kumar]

Hi,
I have interfaced AT25F1024 SPI-EEPROM with LPC2129. The code is to write a single byte of character in to the AT25F1024 & again read the same byte & display on the lcd. I know how to display on the lcd. but i don't know how to write & read a byte from AT251014. I also followed the instructions present in the datasheet of AT25F1024. but the code is not working. can anybody tell how to write & read a byte from AT25F1024 by using LPC21XX.

 

[bigdogguru]

Post your attempted code.

BigDog

 

[v.s.n.kumar]

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#include<LPC21XX.h>
#include"SPILCD.h"//LCD PROGRAMM 
#define slave2 1<<7 //CHIP SELECT PIN
int main(void)
{
 unsigned char dat,ch='A',gar;
 PLLCFG=(1<<2)|(1<<5);//SETTING THE CORE CLOCK AS 60MHZ & PCLK AS 15MHZ
 PLLCON=(1<<0)|(1<<1);// ENABLE THE PLL
 PLLFEED=0XAA;
 PLLFEED=0X55;
 IODIR0=slave2; // MAKING CHIP SELECT PIN IN LPC21XX AS OUTPUT PIN
 IOSET0=slave2; // SLAVE IS DEACTIVATED
 PINSEL0|=(1<<8)|(1<<10)|(1<<12);// MAKING THE PINS AS SCLK,MISO,MOSI
 S0SPCCR=5;// SPI BIT RATE IS 3MHZ
 S0SPCR|=(0<<3)|(0<<4)|(1<<5)|(0<<6);//CLK POLARITY & CLK PHASE AS 0, LPC21XX AS MASTER & MSB IS TRANSMITTED FIRST
 gar=S0SPSR;// CLEARING THE STATUS REGISTER
 IOCLR0=slave2; // SLAVE IS ACTIVATED
 S0SPDR=0X06;//WRITE MODE INSTRUCTION IN AT25F1024 EEPROM
 while((S0SPSR&(1<<7))==0);// MONITORING THE FLAG UNTIL THE LAST BIT IS TRANSMITED
 gar=S0SPSR;// CLEARING THE STATUS REGISTER
 S0SPDR=0X04;//DATA // DATA TO BE PUT IN THE AT251024 EEPROM
 while((S0SPSR&(1<<7))==0);// MONITORING THE FLAG UNTIL THE LAST BIT IS TRANSMITED
 gar=S0SPSR;// CLEARING THE STATUS REGISTER
 IOSET0=slave2;//SLAVE IS DEACTIVATED
 delay(100);// SOME DELAY
 IOCLR0=slave2; //SLAVE IS ACTIVATED
 S0SPDR=0X03;//READ MODE INSTRUCTION IN AT25F1024 EEPROM
 while((S0SPSR&(1<<7))==0);// MONITORING THE FLAG UNTIL THE LAST BIT IS TRANSMITED
 gar=S0SPSR;// CLEARING THE STATUS REGISTER
 S0SPDR=0X00;//DATA CONTAINED IN ADDRESS OF AT25F1024 EEPROM
 S0SPDR=0X00; 
 while((S0SPSR&(1<<7))==0);
 gar=S0SPSR;
 dat=S0SPDR;//THE DATA STORED IN EEPROM IS COPIED IN TO A VARIABLE
 IOSET0=slave2;// SLAVE IS DEACTIVATED
 INIT_LCD();
 if(dat==0x04)
  DAT_LCD('A');
 else
  DAT_LCD('B');
 while(1);
 
 
 
 
}

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