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eeprom.c    181 lines (144 with data), 4.4 kB

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/**
******************************************************************************
* @file eeprom.c
* @brief EEPROM State preserve mechanism
* @author Georg Ottinger
* @version V0.0.1
* @date 10-APR-2012
******************************************************************************
Copyright (C) 2013 Georg Ottinger
This program 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 of the License, or
(at your option) any later version.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
EEPROMSTATE eepromstate;
#ifdef EEPROM_SUPER_COMPLICATED
void init_eeprom()
{
/* Define FLASH programming time */
FLASH_SetProgrammingTime(FLASH_PROGRAMTIME_STANDARD);
/* Unlock Data memory */
FLASH_Unlock(FLASH_MEMTYPE_DATA);
eepromstate.pristine = 0;
get_last_pcid_eeprom();
get_last_state_eeprom();
eepromstate.pcid++;
}
void write_state_eeprom(uint8_t state)
{
uint8_t i;
if(state == 0)
{
eepromstate.pcid++; //implies MOD 256
} else if( state < eepromstate.last_state ) {
eepromstate.pcid++; //implies MOD 256
eepromstate.last_state = 0;
eepromstate.last_addr++;
eepromstate.last_addr %= EEPROM_BYTES;
FLASH_ProgramByte(EEPROM_STARTADDR+(eepromstate.last_addr * EEPROM_GRANULARITY),eepromstate.pcid);
}
if(state == 0)
{
eepromstate.last_addr++;
eepromstate.last_addr %= EEPROM_BYTES;
FLASH_ProgramByte(EEPROM_STARTADDR+(eepromstate.last_addr * EEPROM_GRANULARITY),eepromstate.pcid);
} else {
for( i = 0; i < (state - eepromstate.last_state); i++)
{
eepromstate.last_addr++;
eepromstate.last_addr %= EEPROM_BYTES;
FLASH_ProgramByte(EEPROM_STARTADDR+(eepromstate.last_addr * EEPROM_GRANULARITY),eepromstate.pcid);
}
}
eepromstate.last_state = state;
}
//Counts backwards to find the number of
uint8_t get_last_state_eeprom()
{
uint16_t addr;
uint8_t cur_byte,cnt;
if(eepromstate.pristine)
return 0;
cnt = 0;
addr = eepromstate.last_addr-1;
if(addr == 256) //wrap around
{
addr = EEPROM_BYTES-1;
}
do {
cur_byte = FLASH_ReadByte(EEPROM_STARTADDR+(addr * EEPROM_GRANULARITY));
addr--;
if(addr == 256) //wrap around
{
addr = EEPROM_BYTES-1;
}
cnt++;
} while( cur_byte == eepromstate.pcid && cnt <= EEPROM_BYTES);
cnt--;
eepromstate.last_state = cnt % EEPROM_STATES;
return eepromstate.last_state;
}
void get_last_pcid_eeprom()
{
uint8_t last_byte, cur_byte, found;
uint16_t addr;
found = 0;
last_byte = FLASH_ReadByte( EEPROM_STARTADDR );
for( addr = 1; addr < EEPROM_BYTES; addr ++)
{
cur_byte = FLASH_ReadByte( EEPROM_STARTADDR + (addr*EEPROM_GRANULARITY));
if( (uint8_t)(cur_byte - last_byte) >= 2 ) // implies MOD 256
{
eepromstate.last_addr = addr - 1;
eepromstate.pcid = last_byte;
found = 1;
break;
}
last_byte = cur_byte;
}
if(!found)
{
cur_byte = FLASH_ReadByte( EEPROM_STARTADDR );
if( (uint8_t)(cur_byte - last_byte ) >= 2 ) // implies MOD 256
{
eepromstate.last_addr = EEPROM_BYTES;
eepromstate.pcid = last_byte;
} else { // pristine EEPROM condition
eepromstate.pristine = 1;
eepromstate.last_addr = 0;
eepromstate.pcid = 0;
eepromstate.last_state = 0;
}
}
}
#else
void init_eeprom()
{
/* Define FLASH programming time */
FLASH_SetProgrammingTime(FLASH_PROGRAMTIME_STANDARD);
/* Unlock Data memory */
FLASH_Unlock(FLASH_MEMTYPE_DATA);
eepromstate.last_state = FLASH_ReadByte(EEPROM_STARTADDR);
if (eepromstate.last_state >= EEPROM_STATES)
{
eepromstate.last_state = 0;
}
}
void write_state_eeprom(uint8_t state)
{
eepromstate.last_state = state;
if(eepromstate.last_state >= EEPROM_STATES)
{
eepromstate.last_state = 0;
}
FLASH_ProgramByte(EEPROM_STARTADDR,eepromstate.last_state);
}
#endif