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FM24C256

Hello there,

Please help me, i am looking for a code using CodeVision on How to store and read data from FRAM(FM24C256)...im waiting for your reply.. Thanks in advance...........

Bryan

Parents

0 Bryan Clark Flores over 18 years ago in reply to Bryan Clark Flores

Edited Code:

/* the I2C bus is connected to PORTB */
/* the SDA signal is bit 3 */
/* the SCL signal is bit 4 */

#asm
    .equ __i2c_port=0x18
    .equ __sda_bit=3
    .equ __scl_bit=4
#endasm

/* now you can include the I2C Functions */
#include <i2c.h>

#include <mega16.h>
#include <stdio.h>

#define FRAM_BUS_ADDRESS 0xa0

/* read a byte from the FRAM */
unsigned char fram_read(unsigned char address)
{
  unsigned char data;

  i2c_start();
  i2c_write(FRAM_BUS_ADDRESS);
  //i2c_write((FRAM_BUS_ADDRESS|(int)&0xFE));
  //i2c_write(address+1);
  i2c_write(address);
  i2c_start();
  i2c_write(FRAM_BUS_ADDRESS|1);
  data=i2c_read(0);
  i2c_stop();
  return data;

}

/* write a byte to the FRAM */
void fram_write(unsigned char address, unsigned char data)
{
  i2c_start();
  i2c_write(FRAM_BUS_ADDRESS);
  //i2c_write((FRAM_BUS_ADDRESS|(int)0xFE));
  //i2c_write(address+1);
  i2c_write(address);
  i2c_write(data);
  i2c_stop();
}

void main(void)
{
  unsigned char i;

  PORTB = 0b00000000;
  DDRB  = 0b00000000;

  /*-HW UART-*/
  UCSRA = 0x00;
  UCSRB = 0x18;
  UCSRC = 0x86;
  UBRRH = 0x00;
  UBRRL = 0x17;

  /* initialize the I2C bus */
  i2c_init();

  /* write the byte 55h at address AAh */
  fram_write(0xaa,0x55);

  /* read the byte from address AAh */
  i=fram_read(0xaa);

  /*--------------------------------------------*/
  if (i=='\0'){
       printf("\rFRAM is Empty...\r");
     }
  else{
       printf("\rData stored in FRAM : %c \r",i);
     }
  /*--------------------------------------------*/

  while (1); /* loop forever */
}

Reply

0 Bryan Clark Flores over 18 years ago in reply to Bryan Clark Flores

Edited Code:

/* the I2C bus is connected to PORTB */
/* the SDA signal is bit 3 */
/* the SCL signal is bit 4 */

#asm
    .equ __i2c_port=0x18
    .equ __sda_bit=3
    .equ __scl_bit=4
#endasm

/* now you can include the I2C Functions */
#include <i2c.h>

#include <mega16.h>
#include <stdio.h>

#define FRAM_BUS_ADDRESS 0xa0

/* read a byte from the FRAM */
unsigned char fram_read(unsigned char address)
{
  unsigned char data;

  i2c_start();
  i2c_write(FRAM_BUS_ADDRESS);
  //i2c_write((FRAM_BUS_ADDRESS|(int)&0xFE));
  //i2c_write(address+1);
  i2c_write(address);
  i2c_start();
  i2c_write(FRAM_BUS_ADDRESS|1);
  data=i2c_read(0);
  i2c_stop();
  return data;

}

/* write a byte to the FRAM */
void fram_write(unsigned char address, unsigned char data)
{
  i2c_start();
  i2c_write(FRAM_BUS_ADDRESS);
  //i2c_write((FRAM_BUS_ADDRESS|(int)0xFE));
  //i2c_write(address+1);
  i2c_write(address);
  i2c_write(data);
  i2c_stop();
}

void main(void)
{
  unsigned char i;

  PORTB = 0b00000000;
  DDRB  = 0b00000000;

  /*-HW UART-*/
  UCSRA = 0x00;
  UCSRB = 0x18;
  UCSRC = 0x86;
  UBRRH = 0x00;
  UBRRL = 0x17;

  /* initialize the I2C bus */
  i2c_init();

  /* write the byte 55h at address AAh */
  fram_write(0xaa,0x55);

  /* read the byte from address AAh */
  i=fram_read(0xaa);

  /*--------------------------------------------*/
  if (i=='\0'){
       printf("\rFRAM is Empty...\r");
     }
  else{
       printf("\rData stored in FRAM : %c \r",i);
     }
  /*--------------------------------------------*/

  while (1); /* loop forever */
}

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