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continued implementing flash routines

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This commit is contained in:
Markus Fröschle
2013-02-14 13:58:27 +00:00
parent b49c9e628d
commit 1a6d81ed1d
2 changed files with 47 additions and 11 deletions
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55
sources/basflash.c
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@@ -94,12 +94,41 @@ static const struct romram flash_areas[] =
};
static const int num_flash_areas = sizeof(flash_areas) / sizeof(struct romram);
#define FLASH_ADDRESS 0xe0000000
static volatile uint16_t *flash_unlock1 = (volatile uint16_t *) FLASH_ADDRESS + 0xaaa;
static volatile uint16_t *flash_unlock2 = (volatile uint16_t *) FLASH_ADDRESS + 0x554;
static const uint16_t cmd_unlock1 = 0xaa;
static const uint16_t cmd_unlock2 = 0x55;
static const uint16_t cmd_sector_erase1 = 0x80;
static const uint16_t cmd_sector_erase2 = 0x30;
static const uint16_t cmd_sector_erase_suspend = 0xb0;
static const uint16_t cmd_sector_erase_resume = 0x30;
static const uint16_t cmd_program = 0xa0;
static const uint16_t cmd_autoselect = 0x90;
static const uint16_t cmd_read = 0xf0;
extern err_t simulate();
extern err_t memcpy();
extern err_t verify();
/*
* erase a flash sector
*
* sector_num is the index into the sector table above.
*
* FIXME: need to disable data cache to ensure proper operation
*/
err_t erase_flash_sector(int sector_num)
{
volatile uint32_t rd;
uint32_t size;
*flash_unlock1 = cmd_unlock1;
*flash_unlock2 = cmd_unlock2;
*flash_unlock1 = cmd_autoselect;
rd = * (volatile uint32_t *) FLASH_ADDRESS;
* (volatile uint32_t *) FLASH_ADDRESS = size;
(void) rd; /* get rid of "unused variable" compiler warning */
return OK;
}
@@ -122,16 +151,22 @@ err_t erase_flash_region(void *start_address, uint32_t length)
sector = i;
}
/*
* erase sectors until free space equals length
*
* FIXME: same as above. Currently, there is no prevention against overlapping flash areas.
*/
do {
err = erase_flash_sector(sector);
sector++;
} while ((void *) mx29lv640d_flash_sectors[sector] < start_address + length && ! err);
if (sector >= 0 && sector <= num_flash_sectors)
{
/*
* erase sectors until free space equals length
*
* FIXME: same as above. Currently, there is no prevention against overlapping flash areas.
*/
do {
err = erase_flash_sector(sector);
sector++;
} while ((void *) mx29lv640d_flash_sectors[sector] < start_address + length && ! err);
}
else
{
err = ILLEGAL_SECTOR;
}
return err;
}