Subversion Repositories gecko3

/* -*- c++ -*- */

/*

 * Copyright 2006 Free Software Foundation, Inc.

 *

 * This file is part of GNU Radio

 *

 * GNU Radio is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 3, or (at your option)

 * any later version.

 *

 * GNU Radio is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with GNU Radio; see the file COPYING.  If not, write to

 * the Free Software Foundation, Inc., 51 Franklin Street,

 * Boston, MA 02110-1301, USA.

 */

/************************************************************************/

/** \file         eeprom_io.c

 *************************************************************************

 *  \brief        read and write functions for i2c eeproms

 *

 *  \author       GNU Radio

 */

#include <stdint.h>

#include <stdio.h>

#include "gecko3com_i2c.h" /* in this file are the device adresses defined */

#include "eeprom_io.h"

#include "i2c.h"

#include "delay.h"

#include "debugprint.h"

#define EEPROM_HIGH_ADDR 0x3FFF /**< highest available addres, length */

#define PAGE_LEN  0x40          /**< lenght of a memory page */

/** bit mask to get the corresponding page start adress */

#define PAGE_START_MASK 0xFFC0  

/** bit mask to select the adress inside a memory page */

#define PAGE_MASK 0x003F        

/* returns non-zero if successful, else 0 */

uint8_t eeprom_read (uint16_t eeprom_offset, xdata uint8_t *buf, uint8_t len)

{

  /* We setup a random read by first doing a "zero byte write".

     Writes carry an address.  Reads use an implicit address. */

  static xdata uint8_t cmd[2];

  cmd[0] = eeprom_offset>>8;

  cmd[1] = eeprom_offset & 0xFF;

  if (!i2c_write(I2C_ADDR_BOOT, cmd, 2))

    return 0;

  return i2c_read(I2C_ADDR_BOOT, buf, len);

}

/* returns non-zero if successful, else 0 */

//uint8_t eeprom_write (idata uint8_t i2c_addr, idata uint16_t eeprom_offset,

//            const xdata uint8_t *buf, uint8_t len)

uint8_t eeprom_write (uint16_t eeprom_offset, const xdata uint8_t *buf, \

                      uint8_t len)

{

  uint8_t i = 0, byte_count;

  static xdata uint8_t cmd[66];

  if(eeprom_offset > EEPROM_HIGH_ADDR){

    return 0;

  }

  //print_info("w\n");

  while (len > 0){

    if(eeprom_offset + len > (eeprom_offset & PAGE_START_MASK) + PAGE_LEN){

      byte_count = PAGE_LEN - (eeprom_offset & PAGE_MASK);

    }

    else if(len < PAGE_LEN){

      byte_count = len;

    }

    else {

      byte_count = PAGE_LEN;

    }

    cmd[0] = eeprom_offset>>8;

    cmd[1] = eeprom_offset & 0xFF;

    for(i=0; i < byte_count;i++) {

      cmd[i+2] = buf[i];

    }

    if (!i2c_write(I2C_ADDR_BOOT, cmd, byte_count+2))

      return 0;

    len -= byte_count;

    eeprom_offset += byte_count;

    mdelay(8);          /* delay 8ms worst case write time */

  }

  return 1;

}