8e2ff63a7e
they're local. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19892 a1c6a512-1295-4272-9138-f99709370657
160 lines
3.7 KiB
C
160 lines
3.7 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2006 by Miika Pekkarinen
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "logf.h"
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#include "string.h"
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#include "inttypes.h"
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#include "sw_i2c.h"
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#include "eeprom_24cxx.h"
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/* Use cache to speedup writing to the chip. */
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static char data_cache[EEPROM_SIZE];
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static uint8_t cached_bitfield[EEPROM_SIZE/8];
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#define IS_CACHED(addr) (cached_bitfield[addr/8] & (1 << (addr % 8)))
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#define SET_CACHED(addr) (cached_bitfield[addr/8] |= 1 << (addr % 8))
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void eeprom_24cxx_init(void)
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{
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sw_i2c_init();
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memset(cached_bitfield, 0, sizeof cached_bitfield);
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}
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static int eeprom_24cxx_read_byte(unsigned int address, char *c)
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{
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int ret;
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char byte;
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int count = 0;
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if (address >= EEPROM_SIZE)
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{
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logf("EEPROM address: %d", address);
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return -9;
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}
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/* Check from cache. */
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if (IS_CACHED(address))
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{
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logf("EEPROM RCached: %d", address);
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*c = data_cache[address];
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return 0;
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}
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*c = 0;
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do
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{
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ret = sw_i2c_read(EEPROM_ADDR, address, &byte, 1);
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} while (ret < 0 && count++ < 200);
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if (ret < 0)
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{
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logf("EEPROM RFail: %d/%d/%d", ret, address, count);
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return ret;
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}
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if (count)
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{
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/* keep between {} as logf is whitespace in normal builds */
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logf("EEPROM rOK: %d retries", count);
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}
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/* Cache the byte. */
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data_cache[address] = byte;
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SET_CACHED(address);
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*c = byte;
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return 0;
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}
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static int eeprom_24cxx_write_byte(unsigned int address, char c)
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{
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int ret;
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int count = 0;
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if (address >= EEPROM_SIZE)
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{
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logf("EEPROM address: %d", address);
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return -9;
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}
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/* Check from cache. */
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if (IS_CACHED(address) && data_cache[address] == c)
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{
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logf("EEPROM WCached: %d", address);
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return 0;
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}
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do
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{
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ret = sw_i2c_write(EEPROM_ADDR, address, &c, 1);
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} while (ret < 0 && count++ < 200) ;
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if (ret < 0)
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{
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logf("EEPROM WFail: %d/%d", ret, address);
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return ret;
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}
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if (count)
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{
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/* keep between {} as logf is whitespace in normal builds */
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logf("EEPROM wOK: %d retries", count);
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}
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SET_CACHED(address);
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data_cache[address] = c;
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return 0;
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}
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int eeprom_24cxx_read(unsigned char address, void *dest, int length)
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{
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char *buf = (char *)dest;
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int ret = 0;
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int i;
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for (i = 0; i < length; i++)
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{
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ret = eeprom_24cxx_read_byte(address+i, &buf[i]);
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if (ret < 0)
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return ret;
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}
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return ret;
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}
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int eeprom_24cxx_write(unsigned char address, const void *src, int length)
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{
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const char *buf = (const char *)src;
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int i;
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for (i = 0; i < length; i++)
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{
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if (eeprom_24cxx_write_byte(address+i, buf[i]) < 0)
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return -1;
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}
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return 0;
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}
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