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nussgipfel |
/* -*- c++ -*- */
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/*
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* Copyright 2006 Free Software Foundation, Inc.
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*
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* This file is part of GNU Radio
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*
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* GNU Radio is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3, or (at your option)
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* any later version.
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*
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* GNU Radio is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Radio; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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/************************************************************************/
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/** \file eeprom_io.c
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*************************************************************************
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* \brief read and write functions for i2c eeproms
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*
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* \author GNU Radio
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*/
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#include <stdint.h>
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#include <stdio.h>
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#include "gecko3com_i2c.h" /* in this file are the device adresses defined */
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#include "eeprom_io.h"
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#include "i2c.h"
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#include "delay.h"
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#include "debugprint.h"
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#define EEPROM_HIGH_ADDR 0x3FFF
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#define PAGE_LEN 0x40
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#define PAGE_START_MASK 0xFFC0
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#define PAGE_MASK 0x003F
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/* returns non-zero if successful, else 0 */
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uint8_t eeprom_read (uint16_t eeprom_offset, xdata uint8_t *buf, uint8_t len)
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{
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/* We setup a random read by first doing a "zero byte write".
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Writes carry an address. Reads use an implicit address. */
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static xdata uint8_t cmd[2];
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cmd[0] = eeprom_offset>>8;
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cmd[1] = eeprom_offset & 0xFF;
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if (!i2c_write(I2C_ADDR_BOOT, cmd, 2))
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return 0;
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return i2c_read(I2C_ADDR_BOOT, buf, len);
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}
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/* returns non-zero if successful, else 0 */
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//uint8_t eeprom_write (idata uint8_t i2c_addr, idata uint16_t eeprom_offset,
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// const xdata uint8_t *buf, uint8_t len)
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uint8_t eeprom_write (uint16_t eeprom_offset, const xdata uint8_t *buf, \
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uint8_t len)
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{
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uint8_t i = 0, byte_count;
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static xdata uint8_t cmd[66];
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if(eeprom_offset > EEPROM_HIGH_ADDR){
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return 0;
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}
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//print_info("w\n");
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while (len > 0){
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if(eeprom_offset + len > (eeprom_offset & PAGE_START_MASK) + PAGE_LEN){
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byte_count = PAGE_LEN - (eeprom_offset & PAGE_MASK);
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}
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else if(len < PAGE_LEN){
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byte_count = len;
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}
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else {
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byte_count = PAGE_LEN;
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}
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cmd[0] = eeprom_offset>>8;
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cmd[1] = eeprom_offset & 0xFF;
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for(i=0; i < byte_count;i++) {
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cmd[i+2] = buf[i];
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}
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if (!i2c_write(I2C_ADDR_BOOT, cmd, byte_count+2))
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return 0;
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len -= byte_count;
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eeprom_offset += byte_count;
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mdelay(8); /* delay 8ms worst case write time */
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}
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return 1;
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}
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