Memory problem when using buttonless DFU.

[powerup]

I use nrf52832-AA, S132

I use Fstorage from 0x68000 to 0x73FFF in flash memory.

Reading or writing data from that memory.

NRF_FSTORAGE_DEF(nrf_fstorage_t fstorage) =
{
    /* Set a handler for fstorage events. */
    .evt_handler = fstorage_evt_handler,

    /* These below are the boundaries of the flash space assigned to this instance of fstorage.
     * You must set these manually, even at runtime, before nrf_fstorage_init() is called.
     * The function nrf5_flash_end_addr_get() can be used to retrieve the last address on the
     * last page of flash available to write data. */
    .start_addr = 0x68000,
    .end_addr   = 0x73FFF,
};

It doesn't have any problem working normally.

However, there is a memory problem when updating an application with the buttonless DFU.

If you erase the chip and read the memory, it's 0xFF.
However, after updating the application with the buttonless DFU, there are some strange values in the memory.

I have no idea why.
Did I miss anything?

Thank you.

happy new year.

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The size of MBR was 4096 in the DFU setting of the nRF toolbox.

If the MBR size is 4096 on the nRF52 chip, is there a possibility of the above problem?

[AndreasF]

Hi.

However, there is a memory problem when updating an application with the buttonless DFU.

 What does the new application contain? Are you sure that there is nothing between 0x68000 and 0x73FFF?

Best regards,

Andreas

[powerup]

There seems to be nothing between 0x68000 and 0x73FFF.

[AndreasF]

Hi.

I think the problem is that some of the addresses you use for fstorage gets used by the bootloader during the DFU. You should therefore be sure that these pages are reserved, by defining DFU_APP_DATA_RESERVED in dfu_types.h, you can read a good explanation about this here.

Best regards,

Andreas

[powerup]

Thank you for your answer.
Let me read it.