archive MK1 AVR source
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ikari
175
mk1-src/eeprom.c
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175
mk1-src/eeprom.c
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/* sd2snes - SD card based universal cartridge for the SNES
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Copyright (C) 2009-2010 Maximilian Rehkopf <otakon@gmx.net>
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This file was adapted from sd2iec, written by Ingo Korb.
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Original copyright header follows:
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*/
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/* sd2iec - SD/MMC to Commodore serial bus interface/controller
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Copyright (C) 2007-2009 Ingo Korb <ingo@akana.de>
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Inspiration and low-level SD/MMC access based on code from MMC2IEC
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by Lars Pontoppidan et al., see sdcard.c|h and config.h.
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FAT filesystem access based on code from ChaN and Jim Brain, see ff.c|h.
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This program 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; version 2 of the License only.
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This program 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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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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eeprom.c: Persistent configuration storage
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*/
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#include <avr/eeprom.h>
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#include <avr/io.h>
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#include "config.h"
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#include "diskio.h"
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#include "fatops.h"
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#include "flags.h"
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#include "iec.h"
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#include "timer.h"
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#include "eeprom.h"
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#include "uart.h"
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/**
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* struct storedconfig - in-eeprom data structure
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* @dummy : EEPROM position 0 is unused
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* @checksum : Checksum over the EEPROM contents
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* @structsize : size of the eeprom structure
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* @osccal : stored value of OSCCAL
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* @globalflags: subset of the globalflags variable
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* @address : device address set by software
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* @hardaddress: device address set by jumpers
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* @fileexts : file extension mapping mode
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* @drvflags0 : 16 bits of drv mappings, organized as 4 nybbles.
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* @drvflags1 : 16 bits of drv mappings, organized as 4 nybbles.
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*
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* This is the data structure for the contents of the EEPROM.
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*/
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static EEMEM struct {
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uint8_t dummy;
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uint8_t checksum;
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uint16_t structsize;
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uint8_t osccal;
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uint8_t global_flags;
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uint8_t address;
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uint8_t hardaddress;
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uint8_t fileexts;
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uint16_t drvconfig0;
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uint16_t drvconfig1;
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} storedconfig;
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/**
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* read_configuration - reads configuration from EEPROM
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*
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* This function reads the stored configuration values from the EEPROM.
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* If the stored checksum doesn't match the calculated one nothing will
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* be changed.
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*/
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void read_configuration(void) {
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uint16_t i,size;
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uint8_t checksum, tmp;
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/* Set default values */
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globalflags |= JIFFY_ENABLED; /* JiffyDos enabled */
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globalflags |= POSTMATCH; /* Post-* matching enabled */
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globalflags |= FAT32_FREEBLOCKS; /* Calculate the number of free blocks on FAT32 */
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file_extension_mode = 1; /* Store x00 extensions except for PRG */
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set_drive_config(get_default_driveconfig()); /* Set the default drive configuration */
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/* Use the NEXT button to skip reading the EEPROM configuration */
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if (!(BUTTON_PIN & BUTTON_NEXT)) {
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ignore_keys();
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return;
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}
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size = eeprom_read_word(&storedconfig.structsize);
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/* Calculate checksum of EEPROM contents */
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checksum = 0;
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for (i=2; i<size; i++)
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checksum += eeprom_read_byte((uint8_t *)i);
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/* Abort if the checksum doesn't match */
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if (checksum != eeprom_read_byte(&storedconfig.checksum)) {
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EEAR = 0;
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return;
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}
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/* Read data from EEPROM */
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OSCCAL = eeprom_read_byte(&storedconfig.osccal);
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tmp = eeprom_read_byte(&storedconfig.global_flags);
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globalflags &= (uint8_t)~(JIFFY_ENABLED | POSTMATCH |
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EXTENSION_HIDING | FAT32_FREEBLOCKS);
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globalflags |= tmp;
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if (eeprom_read_byte(&storedconfig.hardaddress) == DEVICE_SELECT)
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device_address = eeprom_read_byte(&storedconfig.address);
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file_extension_mode = eeprom_read_byte(&storedconfig.fileexts);
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#ifdef NEED_DISKMUX
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if (size > 9) {
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uint32_t tmpconfig;
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tmpconfig = eeprom_read_word(&storedconfig.drvconfig0);
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tmpconfig |= (uint32_t)eeprom_read_word(&storedconfig.drvconfig1) << 16;
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set_drive_config(tmpconfig);
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}
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/* sanity check. If the user has truly turned off all drives, turn the
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* defaults back on
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*/
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if(drive_config == 0xffffffff)
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set_drive_config(get_default_driveconfig());
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#endif
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/* Paranoia: Set EEPROM address register to the dummy entry */
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EEAR = 0;
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}
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/**
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* write_configuration - stores configuration data to EEPROM
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*
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* This function stores the current configuration values to the EEPROM.
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*/
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void write_configuration(void) {
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uint16_t i;
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uint8_t checksum;
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/* Write configuration to EEPROM */
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eeprom_write_word(&storedconfig.structsize, sizeof(storedconfig));
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eeprom_write_byte(&storedconfig.osccal, OSCCAL);
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eeprom_write_byte(&storedconfig.global_flags,
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globalflags & (JIFFY_ENABLED | POSTMATCH |
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EXTENSION_HIDING | FAT32_FREEBLOCKS));
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eeprom_write_byte(&storedconfig.address, device_address);
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eeprom_write_byte(&storedconfig.hardaddress, DEVICE_SELECT);
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eeprom_write_byte(&storedconfig.fileexts, file_extension_mode);
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#ifdef NEED_DISKMUX
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eeprom_write_word(&storedconfig.drvconfig0, drive_config);
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eeprom_write_word(&storedconfig.drvconfig1, drive_config >> 16);
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#endif
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/* Calculate checksum over EEPROM contents */
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checksum = 0;
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for (i=2;i<sizeof(storedconfig);i++)
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checksum += eeprom_read_byte((uint8_t *) i);
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/* Store checksum to EEPROM */
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eeprom_write_byte(&storedconfig.checksum, checksum);
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/* Paranoia: Set EEPROM address register to the dummy entry */
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EEAR = 0;
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}
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