FDS Writing Issue with FreeRTOS and Softdevice

Question

Hello,

I am currently trying to get a project working that uses FDS, but I am having trouble getting the writing and updating working.

The peripherals in my project are FDS, FreeRTOS, the Soft Device, BLE, SPI, and TWI.

The issue I am facing lies within the NRF_SDH_DISPATCH_MODEL config in the sdk_config.h

// <o> NRF_SDH_DISPATCH_MODEL
 

// <i> NRF_SDH_DISPATCH_MODEL_INTERRUPT: SoftDevice events are passed to the application from the interrupt context.
// <i> NRF_SDH_DISPATCH_MODEL_APPSH: SoftDevice events are scheduled using @ref app_scheduler.
// <i> NRF_SDH_DISPATCH_MODEL_POLLING: SoftDevice events are to be fetched manually.
// <0=> NRF_SDH_DISPATCH_MODEL_INTERRUPT 
// <1=> NRF_SDH_DISPATCH_MODEL_APPSH 
// <2=> NRF_SDH_DISPATCH_MODEL_POLLING 

#ifndef NRF_SDH_DISPATCH_MODEL
#define NRF_SDH_DISPATCH_MODEL 0
#endif

When NRF_SDH_DISPATCH_MODEL is set to 2 and the softdevice is enabled with nrf_sdh_enable_request(), the FDS writing/updating fails with the error of FDS_ERR_CRC_CHECK_FAILED.

For reference, this is the piece of the sdk_config refers to the meaning of this check failing

// <o> FDS_CRC_CHECK_ON_WRITE  - Perform a CRC check on newly written records.
 

// <i> Perform a CRC check on newly written records.
// <i> This setting can be used to make sure that the record data was not altered while being written to flash.
// <1=> Enabled 
// <0=> Disabled 

#ifndef FDS_CRC_CHECK_ON_WRITE
#define FDS_CRC_CHECK_ON_WRITE 0
#endif

When NRF_SDH_DISPATCH_MODEL is set to 0, the FDS writing/updating works, but once FreeRTOS is included into the project, there is a compiling issue that I am unsure how to solve.

The compiling error is: multiple definition of `SWI2_EGU2_IRQHandler' at components/softdevice/common/nrf_sdh_freertos.c:62 and components/softdevice/common/nrf_sdh.c:366 .

What possible solutions would there be in order for me to be able to use FDS properly and still have all my peripherals included and working?

Either a solution that fixes the compiling issue or a solution that fixes FDS writing/updating?

Susheel Nuguru · Accepted Answer

Thanks for a nice demo to show the issue.

I think the issue lies in where you initiate a flash write command. Flash write operation events are received using softdevice SOC events and I think doing flash operations way before softdevice_task is running is the main problem here.

removing the write from main and moving it into the softdevice_task as follows

/* This function gets events from the SoftDevice and processes them. */
static void softdevice_task(void * pvParameter)
{
    NRF_LOG_DEBUG("Enter softdevice_task.");

    if (m_task_hook != NULL)
    {
        m_task_hook(pvParameter);
    }

    //** FDS MAIN START **
    uint8_t write_data[1] = {0x57};
    uint8_t read_data[1] = {0x00};

    init_fds();
    save_stack_data(write_data,1);
    read_stack_data(read_data,1);
    //** FDS MAIN END **

    while (true)
    {
        nrf_sdh_evts_poll();                    /* let the handlers run first, incase the EVENT occured before creating this task */

        (void) ulTaskNotifyTake(pdTRUE,         /* Clear the notification value before exiting (equivalent to the binary semaphore). */
                                portMAX_DELAY); /* Block indefinitely (INCLUDE_vTaskSuspend has to be enabled).*/
    }
}

gives the below results

<info> app: HRS FreeRTOS example started.
<info> app: Fast advertising.
<info> app: Initializing fds...
<info> app: Event: FDS_EVT_INIT received (NRF_SUCCESS)
<info> app: FDS CHECK-1: FDS_SUCCESS
<info> app: FDS OPEN: FDS_ERR_CRC_CHECK_FAILED
<info> app: FDS CLOSE: FDS_ERR_NO_OPEN_RECORDS
<info> app: Event: FDS_EVT_UPDATE received (NRF_SUCCESS)

Susheel Nuguru · Answer

I think you need to create a task for your flash activity and make the task block until softdevice_task is started and could notify your blocking task. 
 There seems to be some timing related issue when you pull the events in polling mode instead of interrupt mode. In any case, do not trigger any flash activity before you know that the softdevice is properly initialized and ready.

FDS Writing Issue with FreeRTOS and Softdevice

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