DFU Update OTA of an application with ble secure bootloader works only once

[boisi73]

Hi, I try to use the dfu update OTA with ble secure bootloader. If the Flash is erased and only the SD v5.0.0 and the own Bootloader are programmed a update OTA is working fine (using nrf Connect). After that, I tried to update the same APP.HEX file again and now the following error occurs:

[DFU] Remote DFU error: OPERATION FAILED

How can that be ???

Here my development environment:

GCC
NRF52
SDK14
SD5.0.0
Own ble_app_blinky (APP:HEX)
Own bootloader_secure_ble
Own private key

Thanks, Boris

[boisi73]

Hi, here the zip with my files. Now I have a solution. I init the m_fs values (evt_handler, start_addr and end_addr) in the nrf_dfu_init_user function. Here the code in main.c :

/* @BS*/
#include "nrf_fstorage.h"
#include "nrf_dfu_types.h"
extern nrf_fstorage_t m_fs;
extern void dfu_fstorage_evt_handler(nrf_fstorage_evt_t * p_evt);

uint32_t nrf_dfu_init_user(void)/* call in bootloader.c */
{
    NRF_LOG_DEBUG("nrf_dfu_init_user");
    /* fs_data init */
    m_fs.evt_handler   = dfu_fstorage_evt_handler;
    m_fs.start_addr     = MBR_SIZE;
    m_fs.end_addr       = BOOTLOADER_SETTINGS_ADDRESS + CODE_PAGE_SIZE;

    return NRF_SUCCESS;
}

/**@brief Function for application main entry. */
int main(void)
{
   :
   :
}

With this init it works fine. But I don't understand if it's only a workaround or a necessary init ??? Where are the 3 values init after a new start of the eval board. After the programing the values are set. but after a restart they are not set.