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diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/examples/peripheral/blinky_rtc_freertos/main.c b/thirdparty/nRF5_SDK_15.0.0_a53641a/examples/peripheral/blinky_rtc_freertos/main.c
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index 0000000..9e9e32d
--- /dev/null
+++ b/thirdparty/nRF5_SDK_15.0.0_a53641a/examples/peripheral/blinky_rtc_freertos/main.c
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+/**
+ * Copyright (c) 2017 - 2018, Nordic Semiconductor ASA
+ * 
+ * All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ * 
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    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
+ *    conditions and the following disclaimer in the documentation and/or other
+ *    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.
+ * 
+ * 5. Any software provided in binary form under this license must not be reverse
+ *    engineered, decompiled, modified and/or disassembled.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
+ * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+ * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * 
+ */
+/** @file
+ * @defgroup blinky_rtc_freertos_example_main main.c
+ * @{
+ * @ingroup blinky_rtc_freertos_example
+ *
+ * @brief Blinky FreeRTOS Example Application main file.
+ *
+ * This file contains the source code for a sample application using FreeRTOS to blink LEDs.
+ *
+ */
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#include "FreeRTOS.h"
+#include "semphr.h"
+#include "timers.h"
+#include "bsp.h"
+#include "nordic_common.h"
+#include "nrf_drv_clock.h"
+#include "sdk_errors.h"
+#include "app_error.h"
+#include "nrf_drv_rtc.h"
+
+
+#if LEDS_NUMBER <= 2
+#error "Board is not equipped with enough amount of LEDs"
+#endif
+
+/**
+ * @brief RTC instance number used for blinking
+ *
+ */
+#define BLINK_RTC 2
+
+/**
+ * @brief RTC compare channel used
+ *
+ */
+#define BLINK_RTC_CC 0
+
+/**
+ * @brief Number of RTC ticks between interrupts
+ */
+#define BLINK_RTC_TICKS   (RTC_US_TO_TICKS(500000ULL, RTC_DEFAULT_CONFIG_FREQUENCY))
+
+/**
+ * @brief Reference to LED0 toggling FreeRTOS task.
+ */
+static TaskHandle_t  m_led_toggle_task_handle;
+
+/**
+ * @brief Semaphore set in RTC event
+ */
+static SemaphoreHandle_t m_led_semaphore;
+
+/**
+ * @brief RTC configuration
+ */
+static nrf_drv_rtc_config_t const m_rtc_config = NRF_DRV_RTC_DEFAULT_CONFIG;
+
+/**
+ * @brief RTC instance
+ *
+ * Instance of the RTC used for led blinking
+ */
+static nrf_drv_rtc_t const m_rtc = NRF_DRV_RTC_INSTANCE(BLINK_RTC);
+
+
+static void blink_rtc_handler(nrf_drv_rtc_int_type_t int_type)
+{
+    BaseType_t yield_req = pdFALSE;
+    ret_code_t err_code;
+    bsp_board_led_invert(BSP_BOARD_LED_1);
+    err_code = nrf_drv_rtc_cc_set(
+        &m_rtc,
+        BLINK_RTC_CC,
+        (nrf_rtc_cc_get(m_rtc.p_reg, BLINK_RTC_CC) + BLINK_RTC_TICKS) & RTC_COUNTER_COUNTER_Msk,
+        true);
+    APP_ERROR_CHECK(err_code);
+
+   /* The returned value may be safely ignored, if error is returned it only means that
+    * the semaphore is already given (raised). */
+   UNUSED_VARIABLE(xSemaphoreGiveFromISR(m_led_semaphore, &yield_req));
+   portYIELD_FROM_ISR(yield_req);
+}
+
+/**
+ * @brief LED0 task entry function.
+ *
+ * @param[in] pvParameter   Pointer that will be used as the parameter for the task.
+ */
+static void led_toggle_task_function (void * pvParameter)
+{
+    ret_code_t err_code;
+
+    err_code = nrf_drv_rtc_init(&m_rtc, &m_rtc_config, blink_rtc_handler);
+    APP_ERROR_CHECK(err_code);
+    err_code = nrf_drv_rtc_cc_set(&m_rtc, BLINK_RTC_CC, BLINK_RTC_TICKS, true);
+    APP_ERROR_CHECK(err_code);
+    nrf_drv_rtc_enable(&m_rtc);
+
+    m_led_semaphore = xSemaphoreCreateBinary();
+    ASSERT(NULL != m_led_semaphore);
+
+    UNUSED_PARAMETER(pvParameter);
+    while (true)
+    {
+        bsp_board_led_invert(BSP_BOARD_LED_0);
+
+        /* Wait for the event from the RTC */
+        UNUSED_RETURN_VALUE(xSemaphoreTake(m_led_semaphore, portMAX_DELAY));
+    }
+
+    /* Tasks must be implemented to never return... */
+}
+
+
+int main(void)
+{
+    ret_code_t err_code;
+
+    /* Initialize clock driver for better time accuracy in FREERTOS */
+    err_code = nrf_drv_clock_init();
+    APP_ERROR_CHECK(err_code);
+
+    /* Configure LED-pins as outputs */
+    bsp_board_init(BSP_INIT_LEDS);
+
+    /* Create task for LED0 blinking with priority set to 2 */
+    UNUSED_VARIABLE(xTaskCreate(led_toggle_task_function, "LED0", configMINIMAL_STACK_SIZE + 200, NULL, 2, &m_led_toggle_task_handle));
+
+    /* Activate deep sleep mode */
+    SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
+
+    /* Start FreeRTOS scheduler. */
+    vTaskStartScheduler();
+
+    while (true)
+    {
+        ASSERT(false);
+        /* FreeRTOS should not be here... FreeRTOS goes back to the start of stack
+         * in vTaskStartScheduler function. */
+    }
+}
+
+/**
+ * @}
+ */