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/*
* Copyright © 2012 Keith Packard <keithp@keithp.com>
* Copyright © 2011 Anthony Towns <aj@erisian.com.au>
*
* 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; version 2 of the License.
*
* 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>
#include <ao_storage.h>
/* Total bytes of available storage */
__pdata ao_pos_t ao_storage_total = 1024;
/* Block size - device is erased in these units. */
__pdata ao_pos_t ao_storage_block = 1024;
/* Byte offset of config block. Will be ao_storage_block bytes long */
__pdata ao_pos_t ao_storage_config = 0;
/* Storage unit size - device reads and writes must be within blocks of this size. */
__pdata uint16_t ao_storage_unit = 1024;
/*
* The internal flash chip is arranged in 8 byte sectors; the
* chip cannot erase in units smaller than that.
*
* Writing happens in units of 2 bytes and
* can only change bits from 1 to 0. So, you can rewrite
* the same contents, or append to an existing page easily enough
*/
/*
* Erase the specified sector
*/
uint8_t
ao_storage_erase(ao_pos_t pos) __reentrant
{
/* Not necessary */
return 1;
}
#define ao_intflash_wait_idle() do { \
/* Wait for any outstanding writes to complete */ \
while (EECR & (1 << EEPE)) \
; \
} while (0) \
static void
ao_intflash_write(uint16_t pos, uint8_t d)
{
ao_intflash_wait_idle();
EEAR = pos;
EEDR = d;
ao_arch_critical(
EECR |= (1 << EEMPE);
EECR |= (1 << EEPE);
);
}
static uint8_t
ao_intflash_read(uint16_t pos)
{
ao_intflash_wait_idle();
EEAR = pos;
EECR |= (1 << EERE);
return EEDR;
}
/*
* Write to flash
*/
uint8_t
ao_storage_device_write(ao_pos_t pos32, __xdata void *v, uint16_t len) __reentrant
{
uint16_t pos = pos32;
__xdata uint8_t *d = v;
if (pos >= ao_storage_total || pos + len > ao_storage_total)
return 0;
while (len--)
ao_intflash_write(pos++, *d++);
return 1;
}
/*
* Read from flash
*/
uint8_t
ao_storage_device_read(ao_pos_t pos, __xdata void *v, uint16_t len) __reentrant
{
uint8_t *d = v;
if (pos >= ao_storage_total || pos + len > ao_storage_total)
return 0;
while (len--)
*d++ = ao_intflash_read(pos++);
return 1;
}
void
ao_storage_flush(void) __reentrant
{
}
void
ao_storage_setup(void)
{
}
void
ao_storage_device_info(void) __reentrant
{
printf ("Using internal flash\n");
}
void
ao_storage_device_init(void)
{
}
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