owner-nrf52sdk/nRF5_SDK_15.3.0/components/softdevice/common/nrf_sdh_freertos.c

/**
 * Copyright (c) 2017 - 2019, Nordic Semiconductor ASA
 *
 * All rights reserved.
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 * Redistribution and use in source and binary forms, with or without modification,
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 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form, except as embedded into a Nordic
 *    Semiconductor ASA integrated circuit in a product or a software update for
 *    such product, must reproduce the above copyright notice, this list of
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 *    materials provided with the distribution.
 *
 * 3. Neither the name of Nordic Semiconductor ASA nor the names of its
 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * 4. This software, with or without modification, must only be used with a
 *    Nordic Semiconductor ASA integrated circuit.
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#include "nrf_sdh_freertos.h"
#include "nrf_sdh.h"

/* Group of FreeRTOS-related includes. */
#include "FreeRTOS.h"
#include "task.h"
#include "queue.h"
#include "semphr.h"

#define NRF_LOG_MODULE_NAME nrf_sdh_freertos
#include "nrf_log.h"
NRF_LOG_MODULE_REGISTER();

#define NRF_BLE_FREERTOS_SDH_TASK_STACK 256


static TaskHandle_t                 m_softdevice_task;  //!< Reference to SoftDevice FreeRTOS task.
static nrf_sdh_freertos_task_hook_t m_task_hook;        //!< A hook function run by the SoftDevice task before entering its loop.


void SD_EVT_IRQHandler(void)
{
    BaseType_t yield_req = pdFALSE;

    vTaskNotifyGiveFromISR(m_softdevice_task, &yield_req);

    /* Switch the task if required. */
    portYIELD_FROM_ISR(yield_req);
}


/* 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);
    }

    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).*/
    }
}


void nrf_sdh_freertos_init(nrf_sdh_freertos_task_hook_t hook_fn, void * p_context)
{
    NRF_LOG_DEBUG("Creating a SoftDevice task.");

    m_task_hook = hook_fn;

    BaseType_t xReturned = xTaskCreate(softdevice_task,
                                       "BLE",
                                       NRF_BLE_FREERTOS_SDH_TASK_STACK,
                                       p_context,
                                       2,
                                       &m_softdevice_task);
    if (xReturned != pdPASS)
    {
        NRF_LOG_ERROR("SoftDevice task not created.");
        APP_ERROR_HANDLER(NRF_ERROR_NO_MEM);
    }
}