wait_for_flash_ready(&fstorage)

[gercer]

SDK 15.2

SES

nrf52832

Hello!

I´m trying to store an array in the memory. When the devices starts advertising or it is connected the code loops in wait_for_flash_ready(&fstorage);

for(uint32_t i=0; i<10; i++)
{
    ret_code_t rc= nrf_fstorage_write(&fstorage, my_addr+(i*4), &my_array[i], 4, NULL);
    APP_ERROR_CHECK(rc);

    wait_for_flash_ready(&fstorage);
    NRF_LOG_INFO("Done.");
}

Any idea why this could be happening??

Thanks for the help

[Kenneth]

Hello,

I assume you have a nrf_fstorage_sys_evt_handler(), and when there is much BLE activity you may experience NRF_EVT_FLASH_OPERATION_ERROR (operation timeout due to other higher level priorities in the softdevice) instead of NRF_EVT_FLASH_OPERATION_SUCCESS.

When receiving NRF_EVT_FLASH_OPERATION_ERROR you should retry the nrf_fstorage_write().

Best regards,
Kenneth

[gercer]

Hey! I tried to check nrf_fstorage_sys_evt_handler() and it actually never enters that function.

I tested the previous code without the for loop and commenting wait_for_flash_ready. It actually works when i want to write just a part of the array, but when i add the for loop i get a fatal error.

EDIT: in nrf_fstorage_sd.c i modified the is_busy function 

static bool is_busy(nrf_fstorage_t const * p_fs)
{
    UNUSED_PARAMETER(p_fs);

    if(m_flags.state == NRF_FSTORAGE_STATE_OP_EXECUTING)
    {
        test_value ++;
    }

    return (m_flags.state != NRF_FSTORAGE_STATE_IDLE);
}

the code never stops and the test value is always increasing.

[Kenneth]

Not sure exactly what is the problem here, but there are some old examples here that still may be useful:
https://github.com/NordicPlayground/nRF5-flash-storage-examples 

Also there is the documentation you may refer to:
https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.2.0/lib_fstorage.html?cp=4_0_0_3_56