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/*
* Copyright © 2012 Keith Packard <keithp@keithp.com>
*
* 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 2 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, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include <ao.h>
static void
ao_eeprom_wait(void)
{
/* Wait for previous write to complete */
while (EECR & (1 << EEPE))
;
}
static uint8_t
ao_eeprom_read_byte(uint16_t addr)
{
uint8_t v;
ao_eeprom_wait();
EEAR = addr;
cli();
EECR |= (1 << EERE);
v = EEDR;
sei();
return v;
}
static void
ao_eeprom_write_byte(uint16_t addr, uint8_t v)
{
ao_eeprom_wait();
EECR = (0 << EEPM1) | (0 << EEPM0);
EEAR = addr;
EEDR = v;
cli();
EECR |= (1 << EEMPE);
EECR |= (1 << EEPE);
sei();
}
void
ao_eeprom_read(uint16_t addr, void *buf, uint16_t len)
{
uint8_t *b = buf;
while (len--)
*b++ = ao_eeprom_read_byte(addr++);
}
void
ao_eeprom_write(uint16_t addr, void *buf, uint16_t len)
{
uint8_t *b = buf;
while (len--)
ao_eeprom_write_byte(addr++, *b++);
}
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