/****************************************************************************************
** NAME: FlashEraseSectors
** PARAMETER: first_sector first flash sector number
** last_sector last flash sector number
** RETURN VALUE: BLT_TRUE if successful, BLT_FALSE otherwise.
** DESCRIPTION: Erases the flash sectors from first_sector up until last_sector
**
****************************************************************************************/
static blt_bool FlashEraseSectors(blt_int8u first_sector, blt_int8u last_sector)
{
blt_int16u nr_of_blocks;
blt_int16u block_cnt;
blt_addr start_addr;
blt_addr end_addr;
/* validate the sector numbers */
if (first_sector > last_sector)
{
return BLT_FALSE;
}
if ( (first_sector < flashLayout[0].sector_num) || \
(last_sector > flashLayout[FLASH_TOTAL_SECTORS-1].sector_num) )
{
return BLT_FALSE;
}
/* unlock the flash array */
FlashUnlock();
/* check that the flash peripheral is not busy */
if ((FLASH->SR & FLASH_BSY_BIT) == FLASH_BSY_BIT)
{
/* lock the flash array again */
FlashLock();
/* could not perform erase operation */
return BLT_FALSE;
}
/* set the page erase bit to indicate that we are about to erase a block */
FLASH->CR |= FLASH_PER_BIT;
/* determine how many blocks need to be erased */
start_addr = FlashGetSectorBaseAddr(first_sector);
end_addr = FlashGetSectorBaseAddr(last_sector) + FlashGetSectorSize(last_sector) - 1;
nr_of_blocks = (end_addr - start_addr + 1) / FLASH_ERASE_BLOCK_SIZE;
/* erase all blocks one by one */
for (block_cnt=0; block_cnt<nr_of_blocks; block_cnt++)
{
/* store an address of the block that is to be erased to select the block */
FLASH->AR = start_addr + (block_cnt * FLASH_ERASE_BLOCK_SIZE);
/* start the block erase operation */
FLASH->CR |= FLASH_STRT_BIT;
/* wait for the erase operation to complete */
while ((FLASH->SR & FLASH_BSY_BIT) == FLASH_BSY_BIT)
{
/* keep the watchdog happy */
CopService();
}
}
/* reset the page erase bit because we're all done erasing */
FLASH->CR &= ~FLASH_PER_BIT;
/* lock the flash array */
FlashLock();
/* still here so all went okay */
return BLT_TRUE;
} /*** end of FlashEraseSectors ***/
/************************************************************************************//**
** \brief Erases the flash sectors from first_sector up until last_sector.
** \param first_sector First flash sector number.
** \param last_sector Last flash sector number.
** \return BLT_TRUE if successful, BLT_FALSE otherwise.
**
****************************************************************************************/
static blt_bool FlashEraseSectors(blt_int8u first_sector, blt_int8u last_sector)
{
blt_int16u nr_of_blocks;
blt_int16u block_cnt;
blt_addr start_addr;
blt_addr end_addr;
/* validate the sector numbers */
if (first_sector > last_sector)
{
return BLT_FALSE;
}
if ( (first_sector < flashLayout[0].sector_num) || \
(last_sector > flashLayout[FLASH_TOTAL_SECTORS-1].sector_num) )
{
return BLT_FALSE;
}
/* determine how many blocks need to be erased */
start_addr = FlashGetSectorBaseAddr(first_sector);
end_addr = FlashGetSectorBaseAddr(last_sector) + FlashGetSectorSize(last_sector) - 1;
nr_of_blocks = (end_addr - start_addr + 1) / FLASH_ERASE_BLOCK_SIZE;
/* erase all blocks one by one */
for (block_cnt=0; block_cnt<nr_of_blocks; block_cnt++)
{
/* keep the watchdog happy */
CopService();
/* erase the flash page with size FLASH_ERASE_BLOCK_SIZE */
if (FlashLibErase(start_addr + (block_cnt * FLASH_ERASE_BLOCK_SIZE)) != 0)
{
return BLT_FALSE;
}
}
/* still here so all went okay */
return BLT_TRUE;
} /*** end of FlashEraseSectors ***/
