PPI with multiple SAADCs and multiple TIMERs

Dear Nordic Support,

I am using PPI to link 2 timers (10ms & 5s) with 2 SAADC channel (AIN1 - channel 0 & AIN2 - channel 1). 

The nrf_drv_saadc_init function is only called once so it means there is only one callback for the sampling event. In case I am using 2 channels, how do I know that which channel has completed its sampling event in the callback function? When I printed out the ADC value, all I saw is CH0 and CH1 are read at the same time while I expect CH0 every 10ms and CH1 every 5s.

I am using nRF52840 + nRF5 SDK 15.3 + SD 6.1.1.

Thank you and best regards,

           Duy

            

void saadc_transducer_callback(nrf_drv_saadc_evt_t const * p_event)
{
    uint8_t idx;

    if (p_event->type == NRF_DRV_SAADC_EVT_DONE)
    {
        APP_ERROR_CHECK(nrf_drv_saadc_buffer_convert(p_event->data.done.p_buffer, RAW_ADC_BUFF_SIZE));

        NRF_LOG_INFO("T.ADC event number: %d", (int)m_transducer_evt_counter);

        for (idx = 0; idx < RAW_ADC_BUFF_SIZE; idx++)
        {
            NRF_LOG_INFO("%d", p_event->data.done.p_buffer[idx]);
        }
        m_transducer_evt_counter++;
    }
}


static void saadc_sampling_event_init(void)
{
    uint32_t transducer_timer_compare_event_addr, battery_timer_compare_event_addr;
    uint32_t saadc_sample_task_addr;

    APP_ERROR_CHECK(nrf_drv_ppi_init());

    nrf_drv_timer_enable(&TRANSDUCER_TIMER);
    nrf_drv_timer_enable(&BATTERY_TIMER);

    transducer_timer_compare_event_addr = nrf_drv_timer_compare_event_address_get(&TRANSDUCER_TIMER, NRF_TIMER_CC_CHANNEL0);
    battery_timer_compare_event_addr = nrf_drv_timer_compare_event_address_get(&BATTERY_TIMER, NRF_TIMER_CC_CHANNEL0);
    
    saadc_sample_task_addr = nrf_drv_saadc_sample_task_get();
    /* Setup ppi channel so that timer compare event is triggering sample tasks in SAADC */
    APP_ERROR_CHECK(nrf_drv_ppi_channel_alloc(&TORQUE_SAADC_TIMER_PPI_CHANNEL));
    APP_ERROR_CHECK(nrf_drv_ppi_channel_alloc(&BATTERY_SAADC_TIMER_PPI_CHANNEL));

    APP_ERROR_CHECK(nrf_drv_ppi_channel_assign(TORQUE_SAADC_TIMER_PPI_CHANNEL, transducer_timer_compare_event_addr, saadc_sample_task_addr));
    APP_ERROR_CHECK(nrf_drv_ppi_channel_assign(BATTERY_SAADC_TIMER_PPI_CHANNEL, battery_timer_compare_event_addr, saadc_sample_task_addr));
}


static void saadc_init(void)
{
    nrf_saadc_channel_config_t adc_channel_config = NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(NRF_SAADC_INPUT_AIN1);
    nrf_saadc_channel_config_t battery_channel_config = NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(NRF_SAADC_INPUT_AIN2);

    APP_ERROR_CHECK(nrf_drv_saadc_init(NULL, saadc_transducer_callback));

    APP_ERROR_CHECK(nrf_drv_saadc_channel_init(0, &adc_channel_config));
    APP_ERROR_CHECK(nrf_drv_saadc_channel_init(1, &battery_channel_config));

    APP_ERROR_CHECK(nrf_drv_saadc_buffer_convert(m_buffer_pool[0], RAW_ADC_BUFF_SIZE));
    APP_ERROR_CHECK(nrf_drv_saadc_buffer_convert(m_buffer_pool[1], RAW_ADC_BUFF_SIZE));
}

Parents
  • Hi,

     

    If you want one SAADC channel to run every 5ms, and another to run every 5 seconds, you need to use two timers.

    This is because the timer itself will not count to 5 ms, fire the event for sampling your first channel, then run for another 4.995 seconds before triggering the event to sample your second channel.

    Could you try to run a individual timer per event and see if that works better?

     

    Kind regards,

    Håkon

  • Hello ,

    Thank you for your answer, I am running 2 different timers running in different periods (10ms and 5s). If I run only 1 ADC channel + 1 TIMER with PPI, everything works fine.

    Warm regards,

          Duy

    #define APP_ADV_INTERVAL                32                                          /**< The advertising interval (in units of 0.625 ms. This value corresponds to 25 ms). */
    #define ADC_ACQUISITION_INTERVAL        10          
    #define BATTERY_LEVEL_MEAS_INTERVAL     10000                                       /**< Battery level measurement interval (ticks). */
    
    #define APP_ADV_DURATION                18000                                       /**< The advertising duration (180 seconds) in units of 10 milliseconds. */
    
    static void saadc_init(void)
    {
        nrf_saadc_channel_config_t adc_channel_config = NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(NRF_SAADC_INPUT_AIN1);
        nrf_saadc_channel_config_t battery_channel_config = NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(NRF_SAADC_INPUT_AIN2);
    
        APP_ERROR_CHECK(nrf_drv_saadc_init(NULL, saadc_transducer_callback));
    //    APP_ERROR_CHECK(nrf_drv_saadc_init(NULL, saadc_battery_callback));
    
        APP_ERROR_CHECK(nrf_drv_saadc_channel_init(0, &adc_channel_config));
        APP_ERROR_CHECK(nrf_drv_saadc_channel_init(1, &battery_channel_config));
    
        APP_ERROR_CHECK(nrf_drv_saadc_buffer_convert(m_buffer_pool[0], RAW_ADC_BUFF_SIZE));
        APP_ERROR_CHECK(nrf_drv_saadc_buffer_convert(m_buffer_pool[1], RAW_ADC_BUFF_SIZE));
    }
    
    
    /**@brief Function for the Timer initialization.
     *
     * @details Initializes the timer module. This creates and starts application timers.
     */
    static void timers_init(void)
    {
        nrf_drv_timer_config_t timer_cfg = NRF_DRV_TIMER_DEFAULT_CONFIG;
    
        /* Enable app timer */
        APP_ERROR_CHECK(app_timer_init());
    
        /* Create ADC timer */
        APP_ERROR_CHECK(nrf_drv_timer_init(&TRANSDUCER_TIMER, &timer_cfg, adc_acquisition_timeout_handler));
        nrf_drv_timer_extended_compare(&TRANSDUCER_TIMER, NRF_TIMER_CC_CHANNEL0, nrf_drv_timer_ms_to_ticks(&TRANSDUCER_TIMER, ADC_ACQUISITION_INTERVAL), NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK, true);
    
        /* Configure BATTERY TIMER */
        APP_ERROR_CHECK(nrf_drv_timer_init(&BATTERY_TIMER, &timer_cfg, battery_level_meas_timeout_handler));
        nrf_drv_timer_extended_compare(&BATTERY_TIMER, NRF_TIMER_CC_CHANNEL0, nrf_drv_timer_ms_to_ticks(&BATTERY_TIMER, BATTERY_LEVEL_MEAS_INTERVAL), NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK, true);
    }
    
    
    static void saadc_sampling_event_init(void)
    {
        uint32_t transducer_timer_compare_event_addr, battery_timer_compare_event_addr;
        uint32_t saadc_sample_task_addr;
    
        APP_ERROR_CHECK(nrf_drv_ppi_init());
    
        nrf_drv_timer_enable(&TRANSDUCER_TIMER);
        nrf_drv_timer_enable(&BATTERY_TIMER);
    
        transducer_timer_compare_event_addr = nrf_drv_timer_compare_event_address_get(&TRANSDUCER_TIMER, NRF_TIMER_CC_CHANNEL0);
        battery_timer_compare_event_addr = nrf_drv_timer_compare_event_address_get(&BATTERY_TIMER, NRF_TIMER_CC_CHANNEL0);
        
        saadc_sample_task_addr = nrf_drv_saadc_sample_task_get();
        /* Setup ppi channel so that timer compare event is triggering sample tasks in SAADC */
        APP_ERROR_CHECK(nrf_drv_ppi_channel_alloc(&TORQUE_SAADC_TIMER_PPI_CHANNEL));
        APP_ERROR_CHECK(nrf_drv_ppi_channel_alloc(&BATTERY_SAADC_TIMER_PPI_CHANNEL));
    
        APP_ERROR_CHECK(nrf_drv_ppi_channel_assign(TORQUE_SAADC_TIMER_PPI_CHANNEL, transducer_timer_compare_event_addr, saadc_sample_task_addr));
        APP_ERROR_CHECK(nrf_drv_ppi_channel_assign(BATTERY_SAADC_TIMER_PPI_CHANNEL, battery_timer_compare_event_addr, saadc_sample_task_addr));
    }

  • Hello ,

    Please have a look at my code in main.c and my configuration is sdk_config.h file. Sorry for make it not clear but I still don't get it work. I enabled TIMER1 and TIMER2.

    The TRANSDUCER_TIMER is TIMER1 and BATTERY_TIMER is TIMER2. I think I have to clear a register to get this to work.

    const nrf_drv_timer_t TRANSDUCER_TIMER = NRF_DRV_TIMER_INSTANCE(1);                 /**< ADC timer. */
    const nrf_drv_timer_t BATTERY_TIMER = NRF_DRV_TIMER_INSTANCE(2);                    /**< Battery timer. */

    Thank you and best regards, 

                Duy

    55478.main.c
    /**
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     *
     * All rights reserved.
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     */
    /** @file
     *
     * @defgroup ble_sdk_app_hts_main main.c
     * @{
     * @ingroup ble_sdk_app_hts
     * @brief Health Thermometer Service Sample Application main file.
     *
     * This file contains the source code for a sample application using the Health Thermometer service
     * It also includes the sample code for Battery and Device Information services.
     * This application uses the @ref srvlib_conn_params module.
     */
    
    #include "main.h"
    
    
    #define MIN_BATTERY_LEVEL               81                                          /**< Minimum battery level as returned by the simulated measurement function. */
    #define MAX_BATTERY_LEVEL               100                                         /**< Maximum battery level as returned by the simulated measurement function. */
    #define BATTERY_LEVEL_INCREMENT         1                                           /**< Value by which the battery level is incremented/decremented for each call to the simulated measurement function. */
    
    #define TEMP_TYPE_AS_CHARACTERISTIC     0                                           /**< Determines if temperature type is given as characteristic (1) or as a field of measurement (0). */
    
    #define MIN_CELCIUS_DEGREES             3688                                        /**< Minimum temperature in celcius for use in the simulated measurement function (multiplied by 100 to avoid floating point arithmetic). */
    #define MAX_CELCIUS_DEGRESS             3972                                        /**< Maximum temperature in celcius for use in the simulated measurement function (multiplied by 100 to avoid floating point arithmetic). */
    #define CELCIUS_DEGREES_INCREMENT       36                                          /**< Value by which temperature is incremented/decremented for each call to the simulated measurement function (multiplied by 100 to avoid floating point arithmetic). */
    
    
    const nrf_drv_timer_t TRANSDUCER_TIMER = NRF_DRV_TIMER_INSTANCE(1);                 /**< ADC timer. */
    const nrf_drv_timer_t BATTERY_TIMER = NRF_DRV_TIMER_INSTANCE(2);                    /**< Battery timer. */
    static nrf_ppi_channel_t TORQUE_SAADC_TIMER_PPI_CHANNEL;
    static nrf_ppi_channel_t BATTERY_SAADC_TIMER_PPI_CHANNEL;
    BLE_BAS_DEF(m_bas);                                                                 /**< Structure used to identify the battery service. */
    BLE_HTS_DEF(m_hts);                                                                 /**< Structure used to identify the health thermometer service. */
    NRF_BLE_GATT_DEF(m_gatt);                                                           /**< GATT module instance. */
    NRF_BLE_QWR_DEF(m_qwr);                                                             /**< Context for the Queued Write module.*/
    BLE_ADVERTISING_DEF(m_advertising);                                                 /**< Advertising module instance. */
    
    static uint16_t          m_conn_handle = BLE_CONN_HANDLE_INVALID;                   /**< Handle of the current connection. */
    static bool              m_hts_meas_ind_conf_pending = false;                       /**< Flag to keep track of when an indication confirmation is pending. */
    static sensorsim_cfg_t   m_battery_sim_cfg;                                         /**< Battery Level sensor simulator configuration. */
    static sensorsim_state_t m_battery_sim_state;                                       /**< Battery Level sensor simulator state. */
    static sensorsim_cfg_t   m_temp_celcius_sim_cfg;                                    /**< Temperature simulator configuration. */
    static sensorsim_state_t m_temp_celcius_sim_state;                                  /**< Temperature simulator state. */
    static bool              m_device_connected = false;
    static ble_uuid_t m_adv_uuids[] =                                                   /**< Universally unique service identifiers. */
    {
        {BLE_UUID_HEALTH_THERMOMETER_SERVICE, BLE_UUID_TYPE_BLE},
        {BLE_UUID_BATTERY_SERVICE, BLE_UUID_TYPE_BLE},
        {BLE_UUID_DEVICE_INFORMATION_SERVICE, BLE_UUID_TYPE_BLE}
    };
    
    static nrf_saadc_value_t m_buffer_pool[2][RAW_ADC_BUFF_SIZE];
    
    static uint32_t          m_transducer_evt_counter;
    static uint32_t          m_bat_evt_counter;
    
    
    static void advertising_start(bool erase_bonds);
    static void temperature_measurement_send(void);
    
    
    /**@brief Callback function for asserts in the SoftDevice.
     *
     * @details This function will be called in case of an assert in the SoftDevice.
     *
     * @warning This handler is an example only and does not fit a final product. You need to analyze
     *          how your product is supposed to react in case of Assert.
     * @warning On assert from the SoftDevice, the system can only recover on reset.
     *
     * @param[in] line_num   Line number of the failing ASSERT call.
     * @param[in] file_name  File name of the failing ASSERT call.
     */
    void assert_nrf_callback(uint16_t line_num, const uint8_t * p_file_name)
    {
        app_error_handler(DEAD_BEEF, line_num, p_file_name);
    }
    
    /**@brief Function for handling Peer Manager events.
     *
     * @param[in] p_evt  Peer Manager event.
     */
    static void pm_evt_handler(pm_evt_t const * p_evt)
    {
        bool is_indication_enabled;
    
        pm_handler_on_pm_evt(p_evt);
        pm_handler_flash_clean(p_evt);
    
        switch (p_evt->evt_id)
        {
            case PM_EVT_CONN_SEC_SUCCEEDED:
                // Send a single temperature measurement if indication is enabled.
                // NOTE: For this to work, make sure ble_hts_on_ble_evt() is called before
                // pm_evt_handler() in ble_evt_dispatch().
                APP_ERROR_CHECK(ble_hts_is_indication_enabled(&m_hts, &is_indication_enabled));
                if (is_indication_enabled)
                {
                    temperature_measurement_send();
                }
                break;
    
            case PM_EVT_PEERS_DELETE_SUCCEEDED:
                advertising_start(false);
                break;
    
            default:
                break;
        }
    }
    
    
    /**@brief Function for performing a battery measurement, and update the Battery Level characteristic in the Battery Service.
     */
    static void battery_level_update(void)
    {
        ret_code_t err_code;
        uint8_t  battery_level;
    
        battery_level = (uint8_t)sensorsim_measure(&m_battery_sim_state, &m_battery_sim_cfg);
      
        err_code = ble_bas_battery_level_update(&m_bas, battery_level, BLE_CONN_HANDLE_ALL);
        if ((err_code != NRF_SUCCESS) &&
            (err_code != NRF_ERROR_INVALID_STATE) &&
            (err_code != NRF_ERROR_RESOURCES) &&
            (err_code != NRF_ERROR_BUSY) &&
            (err_code != BLE_ERROR_GATTS_SYS_ATTR_MISSING)
           )
        {
            APP_ERROR_HANDLER(err_code);
        }
    }
    
    
    /**@brief Function for handling the Battery measurement timer timeout.
     *
     * @details This function will be called each time the battery level measurement timer expires.
     *
     * @param[in] p_context   Pointer used for passing some arbitrary information (context) from the
     *                        app_start_timer() call to the timeout handler.
     */
    uint16_t counter;
    static void adc_acquisition_timeout_handler(nrf_timer_event_t event_type, void *p_context)
    {
        switch (event_type)
        {
            case NRF_TIMER_EVENT_COMPARE0:
            {    
                counter++;
                if (m_conn_handle != BLE_CONN_HANDLE_INVALID)
                {
                    /* Update torque */
                }
                break;
            }
    
            default: break;
        }
    }
    
    
    /**@brief Function for handling the Battery measurement timer timeout.
     *
     * @details This function will be called each time the battery level measurement timer expires.
     *
     * @param[in] p_context   Pointer used for passing some arbitrary information (context) from the
     *                        app_start_timer() call to the timeout handler.
     */
    uint16_t counter1;
    static void battery_level_meas_timeout_handler(nrf_timer_event_t event_type, void *p_context)
    {
        switch (event_type)
        {
            case NRF_TIMER_EVENT_COMPARE0:
            {    
                counter1++;
                if (m_conn_handle != BLE_CONN_HANDLE_INVALID)
                {
                    temperature_measurement_send();
                    battery_level_update();
                }
                break;
            }
    
            default: break;
        }
    }
    
    
    static void saadc_transducer_callback(nrf_drv_saadc_evt_t const * p_event)
    {
        uint8_t idx;
    
        if (p_event->type == NRF_DRV_SAADC_EVT_DONE)
        {
            APP_ERROR_CHECK(nrf_drv_saadc_buffer_convert(p_event->data.done.p_buffer, RAW_ADC_BUFF_SIZE));
          
            NRF_LOG_INFO("ADC channel %d event number: %d",p_event->data.limit.channel, (int)m_transducer_evt_counter);
    
            for (idx = 0; idx < RAW_ADC_BUFF_SIZE; idx++)
            {
                NRF_LOG_INFO("%d", p_event->data.done.p_buffer[idx]);
            }
            m_transducer_evt_counter++;
        }
    }
    
    
    //static void saadc_battery_callback(nrf_drv_saadc_evt_t const * p_event)
    //{
    //    uint8_t idx;
    //
    //    if (p_event->type == NRF_DRV_SAADC_EVT_DONE)
    //    {
    //        APP_ERROR_CHECK(nrf_drv_saadc_buffer_convert(p_event->data.done.p_buffer, RAW_BATTERY_BUFF_SIZE));
    //
    //        NRF_LOG_INFO("BATTERY event number: %d", (int)m_bat_evt_counter);
    //
    //        for (idx = 0; idx < RAW_BATTERY_BUFF_SIZE; idx++)
    //        {
    //            NRF_LOG_INFO("%d", p_event->data.done.p_buffer[idx]);
    //        }
    //        m_bat_evt_counter++;
    //    }
    //}
    
    
    /**@brief Function for populating simulated health thermometer measurement.
     */
    static void hts_sim_measurement(ble_hts_meas_t * p_meas)
    {
        static ble_date_time_t time_stamp = { 2012, 12, 5, 11, 50, 0 };
    
        uint32_t celciusX100;
    
        p_meas->temp_in_fahr_units = false;
        p_meas->time_stamp_present = true;
        p_meas->temp_type_present  = (TEMP_TYPE_AS_CHARACTERISTIC ? false : true);
    
        celciusX100 = sensorsim_measure(&m_temp_celcius_sim_state, &m_temp_celcius_sim_cfg);
    
        p_meas->temp_in_celcius.exponent = -2;
        p_meas->temp_in_celcius.mantissa = celciusX100;
        p_meas->temp_in_fahr.exponent    = -2;
        p_meas->temp_in_fahr.mantissa    = (32 * 100) + ((celciusX100 * 9) / 5);
        p_meas->time_stamp               = time_stamp;
        p_meas->temp_type                = BLE_HTS_TEMP_TYPE_FINGER;
    
        // update simulated time stamp
        time_stamp.seconds += 27;
        if (time_stamp.seconds > 59)
        {
            time_stamp.seconds -= 60;
            time_stamp.minutes++;
            if (time_stamp.minutes > 59)
            {
                time_stamp.minutes = 0;
            }
        }
    }
    
    
    static void saadc_init(void)
    {
        nrf_saadc_channel_config_t adc_channel_config = NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(NRF_SAADC_INPUT_AIN1);
        nrf_saadc_channel_config_t battery_channel_config = NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(NRF_SAADC_INPUT_AIN2);
    
        APP_ERROR_CHECK(nrf_drv_saadc_init(NULL, saadc_transducer_callback));
    //    APP_ERROR_CHECK(nrf_drv_saadc_init(NULL, saadc_battery_callback));
    
        APP_ERROR_CHECK(nrf_drv_saadc_channel_init(0, &adc_channel_config));
        APP_ERROR_CHECK(nrf_drv_saadc_channel_init(1, &battery_channel_config));
    
        APP_ERROR_CHECK(nrf_drv_saadc_buffer_convert(m_buffer_pool[0], RAW_ADC_BUFF_SIZE));
        APP_ERROR_CHECK(nrf_drv_saadc_buffer_convert(m_buffer_pool[1], RAW_ADC_BUFF_SIZE));
    }
    
    
    /**@brief Function for the Timer initialization.
     *
     * @details Initializes the timer module. This creates and starts application timers.
     */
    static void timers_init(void)
    {
        nrf_drv_timer_config_t timer_cfg = NRF_DRV_TIMER_DEFAULT_CONFIG;
    
        /* Enable app timer */
        APP_ERROR_CHECK(app_timer_init());
    
        /* Create ADC timer */
        APP_ERROR_CHECK(nrf_drv_timer_init(&TRANSDUCER_TIMER, &timer_cfg, adc_acquisition_timeout_handler));
        nrf_drv_timer_extended_compare(&TRANSDUCER_TIMER, NRF_TIMER_CC_CHANNEL0, nrf_drv_timer_ms_to_ticks(&TRANSDUCER_TIMER, ADC_ACQUISITION_INTERVAL), NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK, true);
    
        /* Configure BATTERY TIMER */
        APP_ERROR_CHECK(nrf_drv_timer_init(&BATTERY_TIMER, &timer_cfg, battery_level_meas_timeout_handler));
        nrf_drv_timer_extended_compare(&BATTERY_TIMER, NRF_TIMER_CC_CHANNEL0, nrf_drv_timer_ms_to_ticks(&BATTERY_TIMER, BATTERY_LEVEL_MEAS_INTERVAL), NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK, true);
    }
    
    
    static void saadc_sampling_event_init(void)
    {
        uint32_t transducer_timer_compare_event_addr, battery_timer_compare_event_addr;
        uint32_t saadc_sample_task_addr;
    
        APP_ERROR_CHECK(nrf_drv_ppi_init());
    
        nrf_drv_timer_enable(&TRANSDUCER_TIMER);
        nrf_drv_timer_enable(&BATTERY_TIMER);
    
        transducer_timer_compare_event_addr = nrf_drv_timer_compare_event_address_get(&TRANSDUCER_TIMER, NRF_TIMER_CC_CHANNEL0);
        battery_timer_compare_event_addr = nrf_drv_timer_compare_event_address_get(&BATTERY_TIMER, NRF_TIMER_CC_CHANNEL0);
        
        saadc_sample_task_addr = nrf_drv_saadc_sample_task_get();
        /* Setup ppi channel so that timer compare event is triggering sample tasks in SAADC */
        APP_ERROR_CHECK(nrf_drv_ppi_channel_alloc(&TORQUE_SAADC_TIMER_PPI_CHANNEL));
        APP_ERROR_CHECK(nrf_drv_ppi_channel_alloc(&BATTERY_SAADC_TIMER_PPI_CHANNEL));
    
        APP_ERROR_CHECK(nrf_drv_ppi_channel_assign(TORQUE_SAADC_TIMER_PPI_CHANNEL, transducer_timer_compare_event_addr, saadc_sample_task_addr));
        APP_ERROR_CHECK(nrf_drv_ppi_channel_assign(BATTERY_SAADC_TIMER_PPI_CHANNEL, battery_timer_compare_event_addr, saadc_sample_task_addr));
    }
    
    
    static void saadc_sampling_event_enable(void)
    {
        APP_ERROR_CHECK(nrf_drv_ppi_channel_enable(TORQUE_SAADC_TIMER_PPI_CHANNEL));
    
        APP_ERROR_CHECK(nrf_drv_ppi_channel_enable(BATTERY_SAADC_TIMER_PPI_CHANNEL));
    }
    
    
    /**@brief Function for the GAP initialization.
     *
     * @details This function sets up all the necessary GAP (Generic Access Profile) parameters of the
     *          device including the device name, appearance, and the preferred connection parameters.
     */
    static void gap_params_init(void)
    {
        ble_gap_conn_params_t   gap_conn_params;
        ble_gap_conn_sec_mode_t sec_mode;
    
        BLE_GAP_CONN_SEC_MODE_SET_OPEN(&sec_mode);
    
        APP_ERROR_CHECK(sd_ble_gap_device_name_set(&sec_mode, (const uint8_t *)DEVICE_NAME, strlen(DEVICE_NAME)));
    
        APP_ERROR_CHECK(sd_ble_gap_appearance_set(BLE_APPEARANCE_GENERIC_THERMOMETER));
    
        memset(&gap_conn_params, 0, sizeof(gap_conn_params));
    
        gap_conn_params.min_conn_interval = MIN_CONN_INTERVAL;
        gap_conn_params.max_conn_interval = MAX_CONN_INTERVAL;
        gap_conn_params.slave_latency     = SLAVE_LATENCY;
        gap_conn_params.conn_sup_timeout  = CONN_SUP_TIMEOUT;
    
        APP_ERROR_CHECK(sd_ble_gap_ppcp_set(&gap_conn_params));
    }
    
    
    /**@brief Function for initializing the GATT module.
     */
    static void gatt_init(void)
    {
        APP_ERROR_CHECK(nrf_ble_gatt_init(&m_gatt, NULL));
    }
    
    
    /**@brief Function for simulating and sending one Temperature Measurement.
     */
    static void temperature_measurement_send(void)
    {
        ble_hts_meas_t simulated_meas;
        ret_code_t     err_code;
    
        if (!m_hts_meas_ind_conf_pending)
        {
            hts_sim_measurement(&simulated_meas);
    
            err_code = ble_hts_measurement_send(&m_hts, &simulated_meas);
    
            switch (err_code)
            {
                case NRF_SUCCESS:
                    // Measurement was successfully sent, wait for confirmation.
                    m_hts_meas_ind_conf_pending = true;
                    break;
    
                case NRF_ERROR_INVALID_STATE:
                    // Ignore error.
                    break;
    
                default:
                    APP_ERROR_HANDLER(err_code);
                    break;
            }
        }
    }
    
    
    /**@brief Function for handling the Health Thermometer Service events.
     *
     * @details This function will be called for all Health Thermometer Service events which are passed
     *          to the application.
     *
     * @param[in] p_hts  Health Thermometer Service structure.
     * @param[in] p_evt  Event received from the Health Thermometer Service.
     */
    static void on_hts_evt(ble_hts_t * p_hts, ble_hts_evt_t * p_evt)
    {
        switch (p_evt->evt_type)
        {
            case BLE_HTS_EVT_INDICATION_ENABLED:
                // Indication has been enabled, send a single temperature measurement
                temperature_measurement_send();
                break;
    
            case BLE_HTS_EVT_INDICATION_CONFIRMED:
                m_hts_meas_ind_conf_pending = false;
                break;
    
            default:
                // No implementation needed.
                break;
        }
    }
    
    
    /**@brief Function for handling Queued Write Module errors.
     *
     * @details A pointer to this function will be passed to each service which may need to inform the
     *          application about an error.
     *
     * @param[in]   nrf_error   Error code containing information about what went wrong.
     */
    static void nrf_qwr_error_handler(uint32_t nrf_error)
    {
        APP_ERROR_HANDLER(nrf_error);
    }
    
    
    /**@brief Function for initializing services that will be used by the application.
     *
     * @details Initialize the Health Thermometer, Battery and Device Information services.
     */
    static void services_init(void)
    {
        ret_code_t         err_code;
        ble_hts_init_t     hts_init;
        ble_bas_init_t     bas_init;
        ble_dis_init_t     dis_init;
        nrf_ble_qwr_init_t qwr_init = {0};
        ble_dis_sys_id_t   sys_id;
    
        // Initialize Queued Write Module.
        qwr_init.error_handler = nrf_qwr_error_handler;
    
        APP_ERROR_CHECK(nrf_ble_qwr_init(&m_qwr, &qwr_init));
    
        // Initialize Health Thermometer Service
        memset(&hts_init, 0, sizeof(hts_init));
    
        hts_init.evt_handler                 = on_hts_evt;
        hts_init.temp_type_as_characteristic = TEMP_TYPE_AS_CHARACTERISTIC;
        hts_init.temp_type                   = BLE_HTS_TEMP_TYPE_BODY;
    
        // Here the sec level for the Health Thermometer Service can be changed/increased.
        hts_init.ht_meas_cccd_wr_sec = SEC_JUST_WORKS;
        hts_init.ht_type_rd_sec      = SEC_OPEN;
    
        APP_ERROR_CHECK(ble_hts_init(&m_hts, &hts_init));
    
        // Initialize Battery Service.
        memset(&bas_init, 0, sizeof(bas_init));
    
        // Here the sec level for the Battery Service can be changed/increased.
        bas_init.bl_rd_sec        = SEC_OPEN;
        bas_init.bl_cccd_wr_sec   = SEC_OPEN;
        bas_init.bl_report_rd_sec = SEC_OPEN;
    
        bas_init.evt_handler          = NULL;
        bas_init.support_notification = true;
        bas_init.p_report_ref         = NULL;
        bas_init.initial_batt_level   = 100;
    
        APP_ERROR_CHECK(ble_bas_init(&m_bas, &bas_init));
    
        // Initialize Device Information Service.
        memset(&dis_init, 0, sizeof(dis_init));
    
        ble_srv_ascii_to_utf8(&dis_init.manufact_name_str, MANUFACTURER_NAME);
        ble_srv_ascii_to_utf8(&dis_init.model_num_str, MODEL_NUM);
    
        sys_id.manufacturer_id            = MANUFACTURER_ID;
        sys_id.organizationally_unique_id = ORG_UNIQUE_ID;
        dis_init.p_sys_id                 = &sys_id;
    
        dis_init.dis_char_rd_sec = SEC_OPEN;
    
        APP_ERROR_CHECK(ble_dis_init(&dis_init));
    }
    
    
    /**@brief Function for initializing the sensor simulators.
     */
    static void sensor_simulator_init(void)
    {
        m_battery_sim_cfg.min          = MIN_BATTERY_LEVEL;
        m_battery_sim_cfg.max          = MAX_BATTERY_LEVEL;
        m_battery_sim_cfg.incr         = BATTERY_LEVEL_INCREMENT;
        m_battery_sim_cfg.start_at_max = true;
    
        sensorsim_init(&m_battery_sim_state, &m_battery_sim_cfg);
    
        // Temperature is in celcius (it is multiplied by 100 to avoid floating point arithmetic).
        m_temp_celcius_sim_cfg.min          = MIN_CELCIUS_DEGREES;
        m_temp_celcius_sim_cfg.max          = MAX_CELCIUS_DEGRESS;
        m_temp_celcius_sim_cfg.incr         = CELCIUS_DEGREES_INCREMENT;
        m_temp_celcius_sim_cfg.start_at_max = false;
    
        sensorsim_init(&m_temp_celcius_sim_state, &m_temp_celcius_sim_cfg);
    }
    
    
    /**@brief Function for handling the Connection Parameters Module.
     *
     * @details This function will be called for all events in the Connection Parameters Module which
     *          are passed to the application.
     *          @note All this function does is to disconnect. This could have been done by simply
     *                setting the disconnect_on_fail config parameter, but instead we use the event
     *                handler mechanism to demonstrate its use.
     *
     * @param[in] p_evt  Event received from the Connection Parameters Module.
     */
    static void on_conn_params_evt(ble_conn_params_evt_t * p_evt)
    {
        if (p_evt->evt_type == BLE_CONN_PARAMS_EVT_FAILED)
        {
            APP_ERROR_CHECK(sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_CONN_INTERVAL_UNACCEPTABLE));
        }
    }
    
    
    /**@brief Function for handling a Connection Parameters error.
     *
     * @param[in] nrf_error  Error code containing information about what went wrong.
     */
    static void conn_params_error_handler(uint32_t nrf_error)
    {
        APP_ERROR_HANDLER(nrf_error);
    }
    
    
    /**@brief Function for initializing the Connection Parameters module.
     */
    static void conn_params_init(void)
    {
        ble_conn_params_init_t cp_init;
    
        memset(&cp_init, 0, sizeof(cp_init));
    
        cp_init.p_conn_params                  = NULL;
        cp_init.first_conn_params_update_delay = FIRST_CONN_PARAMS_UPDATE_DELAY;
        cp_init.next_conn_params_update_delay  = NEXT_CONN_PARAMS_UPDATE_DELAY;
        cp_init.max_conn_params_update_count   = MAX_CONN_PARAMS_UPDATE_COUNT;
        cp_init.start_on_notify_cccd_handle    = BLE_GATT_HANDLE_INVALID;
        cp_init.disconnect_on_fail             = false;
        cp_init.evt_handler                    = on_conn_params_evt;
        cp_init.error_handler                  = conn_params_error_handler;
    
        APP_ERROR_CHECK(ble_conn_params_init(&cp_init));
    }
    
    
    /**@brief Function for putting the chip into sleep mode.
     *
     * @note This function will not return.
     */
    static void sleep_mode_enter(void)
    {
        APP_ERROR_CHECK(bsp_indication_set(BSP_INDICATE_IDLE));
    
        // Prepare wakeup buttons.
        APP_ERROR_CHECK(bsp_btn_ble_sleep_mode_prepare());
    
        // Go to system-off mode (this function will not return; wakeup will cause a reset).
        APP_ERROR_CHECK(sd_power_system_off());
    }
    
    
    /**@brief Function for handling advertising events.
     *
     * @details This function will be called for advertising events which are passed to the application.
     *
     * @param[in] ble_adv_evt  Advertising event.
     */
    static void on_adv_evt(ble_adv_evt_t ble_adv_evt)
    {
        switch (ble_adv_evt)
        {
            case BLE_ADV_EVT_FAST:
                NRF_LOG_INFO("Fast advertising.");
                APP_ERROR_CHECK(bsp_indication_set(BSP_INDICATE_ADVERTISING));
                break;
    
            case BLE_ADV_EVT_IDLE:
                sleep_mode_enter();
                break;
    
            default:
                break;
        }
    }
    
    
    /**@brief Function for handling BLE events.
     *
     * @param[in]   p_ble_evt   Bluetooth stack event.
     * @param[in]   p_context   Unused.
     */
    static void ble_evt_handler(ble_evt_t const * p_ble_evt, void * p_context)
    {
        switch (p_ble_evt->header.evt_id)
        {
            case BLE_GAP_EVT_CONNECTED:
                NRF_LOG_INFO("Connected.");
                APP_ERROR_CHECK(bsp_indication_set(BSP_INDICATE_CONNECTED));
                m_conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
                APP_ERROR_CHECK(nrf_ble_qwr_conn_handle_assign(&m_qwr, m_conn_handle));
                m_device_connected = true;
                break;
    
            case BLE_GAP_EVT_DISCONNECTED:
                NRF_LOG_INFO("Disconnected.");
                m_conn_handle               = BLE_CONN_HANDLE_INVALID;
                m_hts_meas_ind_conf_pending = false;
                m_device_connected          = false;
                break;
    
            case BLE_GAP_EVT_PHY_UPDATE_REQUEST:
            {
                NRF_LOG_DEBUG("PHY update request.");
                ble_gap_phys_t const phys =
                {
                    .rx_phys = BLE_GAP_PHY_AUTO,
                    .tx_phys = BLE_GAP_PHY_AUTO,
                };
                APP_ERROR_CHECK(sd_ble_gap_phy_update(p_ble_evt->evt.gap_evt.conn_handle, &phys));
            } break;
    
            case BLE_GATTC_EVT_TIMEOUT:
                // Disconnect on GATT Client timeout event.
                NRF_LOG_DEBUG("GATT Client Timeout.");
                APP_ERROR_CHECK(sd_ble_gap_disconnect(p_ble_evt->evt.gattc_evt.conn_handle, BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION));
                break;
    
            case BLE_GATTS_EVT_TIMEOUT:
                // Disconnect on GATT Server timeout event.
                NRF_LOG_DEBUG("GATT Server Timeout.");
                APP_ERROR_CHECK(sd_ble_gap_disconnect(p_ble_evt->evt.gatts_evt.conn_handle, BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION));
                break;
    
            default:
                // No implementation needed.
                break;
        }
    }
    
    
    /**@brief Function for initializing the BLE stack.
     *
     * @details Initializes the SoftDevice and the BLE event interrupt.
     */
    static void ble_stack_init(void)
    {
        APP_ERROR_CHECK(nrf_sdh_enable_request());
    
        // Configure the BLE stack using the default settings.
        // Fetch the start address of the application RAM.
        uint32_t ram_start = 0;
        APP_ERROR_CHECK(nrf_sdh_ble_default_cfg_set(APP_BLE_CONN_CFG_TAG, &ram_start));
    
        // Enable BLE stack.
        APP_ERROR_CHECK(nrf_sdh_ble_enable(&ram_start));
    
        // Register a handler for BLE events.
        NRF_SDH_BLE_OBSERVER(m_ble_observer, APP_BLE_OBSERVER_PRIO, ble_evt_handler, NULL);
    }
    
    
    /**@brief Function for handling events from the BSP module.
     *
     * @param[in]   event   Event generated by button press.
     */
    static void bsp_event_handler(bsp_event_t event)
    {
        ret_code_t err_code;
    
        switch (event)
        {
            case BSP_EVENT_SLEEP:
                sleep_mode_enter();
                break;
    
            case BSP_EVENT_DISCONNECT:
                err_code = sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
                if (err_code != NRF_ERROR_INVALID_STATE)
                {
                    APP_ERROR_CHECK(err_code);
                }
                break;
    
            case BSP_EVENT_WHITELIST_OFF:
                if (m_conn_handle == BLE_CONN_HANDLE_INVALID)
                {
                    err_code = ble_advertising_restart_without_whitelist(&m_advertising);
                    if (err_code != NRF_ERROR_INVALID_STATE)
                    {
                        APP_ERROR_CHECK(err_code);
                    }
                }
                break;
    
            default:
                break;
        }
    }
    
    
    /**@brief Function for the Peer Manager initialization.
     */
    static void peer_manager_init(void)
    {
        ble_gap_sec_params_t sec_param;
    
        APP_ERROR_CHECK(pm_init());
    
        memset(&sec_param, 0, sizeof(ble_gap_sec_params_t));
    
        // Security parameters to be used for all security procedures.
        sec_param.bond           = SEC_PARAM_BOND;
        sec_param.mitm           = SEC_PARAM_MITM;
        sec_param.lesc           = SEC_PARAM_LESC;
        sec_param.keypress       = SEC_PARAM_KEYPRESS;
        sec_param.io_caps        = SEC_PARAM_IO_CAPABILITIES;
        sec_param.oob            = SEC_PARAM_OOB;
        sec_param.min_key_size   = SEC_PARAM_MIN_KEY_SIZE;
        sec_param.max_key_size   = SEC_PARAM_MAX_KEY_SIZE;
        sec_param.kdist_own.enc  = 1;
        sec_param.kdist_own.id   = 1;
        sec_param.kdist_peer.enc = 1;
        sec_param.kdist_peer.id  = 1;
    
        APP_ERROR_CHECK(pm_sec_params_set(&sec_param));
    
        APP_ERROR_CHECK(pm_register(pm_evt_handler));
    }
    
    
    /**@brief Clear bond information from persistent storage.
     */
    static void delete_bonds(void)
    {
        NRF_LOG_INFO("Erase bonds!");
    
        APP_ERROR_CHECK(pm_peers_delete());
    }
    
    
    /**@brief Function for initializing the Advertising functionality.
     *
     * @details Encodes the required advertising data and passes it to the stack.
     *          Also builds a structure to be passed to the stack when starting advertising.
     */
    static void advertising_init(void)
    {
        ble_advertising_init_t init;
    
        memset(&init, 0, sizeof(init));
    
        init.advdata.name_type               = BLE_ADVDATA_FULL_NAME;
        init.advdata.include_appearance      = true;
        init.advdata.flags                   = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE;
        init.advdata.uuids_complete.uuid_cnt = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
        init.advdata.uuids_complete.p_uuids  = m_adv_uuids;
    
        init.config.ble_adv_fast_enabled  = true;
        init.config.ble_adv_fast_interval = APP_ADV_INTERVAL;
        init.config.ble_adv_fast_timeout  = APP_ADV_DURATION;
    
        init.evt_handler = on_adv_evt;
    
        APP_ERROR_CHECK(ble_advertising_init(&m_advertising, &init));
    
        ble_advertising_conn_cfg_tag_set(&m_advertising, APP_BLE_CONN_CFG_TAG);
    }
    
    
    /**@brief Function for initializing buttons and leds.
     *
     * @param[out] p_erase_bonds  Will be true if the clear bonding button was pressed to wake the application up.
     */
    static void buttons_leds_init(bool * p_erase_bonds)
    {
        bsp_event_t startup_event;
    
        APP_ERROR_CHECK(bsp_init(BSP_INIT_LEDS | BSP_INIT_BUTTONS, bsp_event_handler));
    
        APP_ERROR_CHECK(bsp_btn_ble_init(NULL, &startup_event));
    
        *p_erase_bonds = (startup_event == BSP_EVENT_CLEAR_BONDING_DATA);
    }
    
    
    /**@brief Function for initializing the nrf log module.
     */
    static void log_init(void)
    {
        APP_ERROR_CHECK(NRF_LOG_INIT(NULL));
    
        NRF_LOG_DEFAULT_BACKENDS_INIT();
    }
    
    
    /**@brief Function for initializing power management.
     */
    static void power_management_init(void)
    {
        APP_ERROR_CHECK(nrf_pwr_mgmt_init());
    }
    
    
    /**@brief Function for handling the idle state (main loop).
     *
     * @details If there is no pending log operation, then sleep until next the next event occurs.
     */
    static void idle_state_handle(void)
    {
        if (NRF_LOG_PROCESS() == false)
        {
            nrf_pwr_mgmt_run();
        }
    }
    
    
    /**@brief Function for starting advertising.
     */
    static void advertising_start(bool erase_bonds)
    {
        if (erase_bonds == true)
        {
            delete_bonds();
            // Advertising is started by PM_EVT_PEERS_DELETE_SUCCEEDED event.
        }
        else
        {
            APP_ERROR_CHECK(ble_advertising_start(&m_advertising, BLE_ADV_MODE_FAST));
        }
    }
    
    
    /**@brief Function for application main entry.
     */
    int main(void)
    {
        bool erase_bonds;
    
        // Initialize.
        log_init();   
        timers_init();
        buttons_leds_init(&erase_bonds);  
        power_management_init();
        ble_stack_init();
        gap_params_init();
        gatt_init();
        advertising_init();
        services_init();
        sensor_simulator_init();
        conn_params_init();
        peer_manager_init();
        
        // Start execution.
        NRF_LOG_INFO("Health Thermometer example started.");
        advertising_start(erase_bonds);
    
        saadc_init();
        saadc_sampling_event_init();
        saadc_sampling_event_enable();
        // Enter main loop.
        for (;;)
        {
            idle_state_handle();
        }
    }
    
    
    /**
     * @}
     */
    
    0601.sdk_config.h

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