Flash EPCS access problem

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originally posted by jérôme@Apr 28 2006, 04:19 AM

the problem is that each access with 'alt_write_flash'[/b] function seems to erase the entire block/sector of the flash (which represent 0x10000 datas). Is there a solution to my problem ?

Thanks,

Jérôme

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[/b]

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This is the nature of using most any flash device.

For your situation, it makes sense to use the alt_write_flash_block() function. It won&#39;t automatically erase the flash....like alt_write_flash() does. In this way you could write to the flash in whatever data size you want and detect when a sector erase is necessary yourself.

Something like the following should work if you implement it in a loop passing new "data" in with each pass:

if(new_flash_block != current_flash_block)
    {
      printf("\nFlash Block %d", new_flash_block);
      alt_erase_flash_block(fd, (new_flash_block * regions->block_size), 
                                      regions->block_size);
      current_flash_block = new_flash_block;
    }
    alt_write_flash_block(fd, (current_flash_block * regions->block_size), 
                                   target_addr, data, data_len);

Cheers,

- slacker