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167 lines
5.0 KiB
C
167 lines
5.0 KiB
C
/*
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* Copyright (c) 2013, Robert Quattlebaum.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* Author: Robert Quattlebaum <darco@deepdarc.com>
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*
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*/
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#include "contiki.h"
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#include "dev/eeprom.h"
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#include <stdio.h>
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#include <stdlib.h>
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static FILE *eeprom_file;
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/*---------------------------------------------------------------------------*/
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static void
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eeprom_fill(eeprom_addr_t addr, unsigned char value, int size)
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{
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if((addr > EEPROM_END_ADDR) || (addr+size > EEPROM_END_ADDR+1) || size < 0) {
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fprintf(stderr, "eeprom_fill: Bad address and/or size (addr = %04x, size = %d)\n", addr, size);
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/* Abort here so that we break into the debugger. If a debugger isn't
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* attached, well we might as well crash anyway.
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*/
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abort();
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}
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if(!eeprom_file) {
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eeprom_init();
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}
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fseek(eeprom_file, addr, SEEK_SET);
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while(size--) {
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if(fputc(value, eeprom_file) != value) {
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perror("fputc() failed");
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exit(EXIT_FAILURE);
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}
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}
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}
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/*---------------------------------------------------------------------------*/
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void
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eeprom_init(void)
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{
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long length;
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char *eeprom_filename = getenv("CONTIKI_EEPROM");
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if(eeprom_filename) {
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eeprom_file = fopen(eeprom_filename, "r+");
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if(!eeprom_file) {
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/* File does exist yet, so let's create it. */
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eeprom_file = fopen(eeprom_filename, "w+");
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if(!eeprom_file) {
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perror("Unable to create EEPROM file");
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exit(EXIT_FAILURE);
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}
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}
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fprintf(stderr, "eeprom_init: Using \"%s\".\n", eeprom_filename);
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} else {
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eeprom_file = tmpfile();
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if(!eeprom_file) {
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perror("Unable to create temporary EEPROM file");
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exit(EXIT_FAILURE);
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}
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}
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/* Make sure that the file is the correct size by seeking
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* to the end and checking the file position. If it is
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* less than what we expect, we pad out the rest of the file
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* with 0xFF, just like a real EEPROM. */
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fseek(eeprom_file, 0, SEEK_END);
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length = ftell(eeprom_file);
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if(length < 0) {
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perror("ftell failed");
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exit(EXIT_FAILURE);
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}
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if(length < EEPROM_END_ADDR) {
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/* Fill with 0xFF, just like a real EEPROM. */
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eeprom_fill(length, 0xFF, EEPROM_SIZE - length);
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}
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}
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/*---------------------------------------------------------------------------*/
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void
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eeprom_write(eeprom_addr_t addr, unsigned char *buf, int size)
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{
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if((addr > EEPROM_END_ADDR) || (addr+size > EEPROM_END_ADDR+1) || size < 0) {
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fprintf(stderr, "eeprom_write: Bad address and/or size (addr = %04x, size = %d)\n", addr, size);
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/* Abort here so that we break into the debugger. If a debugger isn't
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* attached, well we might as well crash anyway.
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*/
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abort();
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}
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if(!eeprom_file) {
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eeprom_init();
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}
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fseek(eeprom_file, addr, SEEK_SET);
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if(fwrite(buf, 1, size, eeprom_file) != size) {
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perror("fwrite() failed");
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exit(EXIT_FAILURE);
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}
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}
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/*---------------------------------------------------------------------------*/
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void
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eeprom_read(eeprom_addr_t addr, unsigned char *buf, int size)
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{
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if((addr > EEPROM_END_ADDR) || (addr+size > EEPROM_END_ADDR+1) || size < 0) {
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fprintf(stderr, "eeprom_read: Bad address and/or size (addr = %04x, size = %d)\n", addr, size);
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/* Abort here so that we break into the debugger. If a debugger isn't
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* attached, well we might as well crash anyway. */
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abort();
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}
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if(!eeprom_file) {
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eeprom_init();
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}
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fseek(eeprom_file, addr, SEEK_SET);
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if(fread(buf, 1, size, eeprom_file) != size) {
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perror("fread() failed");
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exit(EXIT_FAILURE);
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}
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}
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