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eeprom.c
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eeprom.c
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/*
* Copyright (c) 2016, Conor Patrick
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <SI_EFM8UB1_Register_Enums.h>
#include <stdint.h>
#include "eeprom.h"
void eeprom_init()
{
uint8_t secbyte;
eeprom_read(0xFBFF,&secbyte,1);
if (secbyte == 0xff)
{
eeprom_erase(0xFBC0);
secbyte = -32;
eeprom_write(0xFBFF, &secbyte, 1);
}
}
void eeprom_read(uint16_t addr, uint8_t * buf, uint8_t len)
{
uint8_t code * eepaddr = (uint8_t code *) addr;
bit old_int;
while(len--)
{
old_int = IE_EA;
IE_EA = 0;
*buf++ = *eepaddr++;
IE_EA = old_int;
}
}
void _eeprom_write(uint16_t addr, uint8_t * buf, uint8_t len, uint8_t flags)
{
uint8_t xdata * data eepaddr = (uint8_t xdata *) addr;
bit old_int;
while(len--)
{
old_int = IE_EA;
IE_EA = 0;
// Enable VDD monitor
VDM0CN = 0x80;
RSTSRC = 0x02;
// unlock key
FLKEY = 0xA5;
FLKEY = 0xF1;
PSCTL |= flags;
*eepaddr = *buf;
PSCTL &= ~flags;
IE_EA = old_int;
eepaddr++;
buf++;
}
}