Reduce power consumption on nRF51822

[Angelo Cotroneo]

Hi all,

I am using the nRF51822 and attach you can find the

Fullscreen main.c Download

/* Copyright (c) 2014 Nordic Semiconductor. All Rights Reserved.
 *
 * The information contained herein is property of Nordic Semiconductor ASA.
 * Terms and conditions of usage are described in detail in NORDIC
 * SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
 *
 * Licensees are granted free, non-transferable use of the information. NO
 * WARRANTY of ANY KIND is provided. This heading must NOT be removed from
 * the file.
 *
 */

/** 
 * ble_app_uart example with interrupt driven ADC functionality
 */

#include <stdint.h>
#include <string.h>
#include "nordic_common.h"
#include "nrf.h"
#include "ble_hci.h"
#include "ble_advdata.h"
#include "ble_advertising.h"
#include "ble_conn_params.h"
#include "softdevice_handler.h"
#include "app_timer.h"
#include "app_button.h"
#include "ble_nus.h"
#include "app_uart.h"
#include "app_util_platform.h"
#include "bsp.h"
#include "bsp_btn_ble.h"
#include "nrf_drv_adc.h"
#include "nrf_drv_ppi.h"
#include "nrf_drv_timer.h"

#define IS_SRVC_CHANGED_CHARACT_PRESENT 0                                           /**< Include the service_changed characteristic. If not enabled, the server's database cannot be changed for the lifetime of the device. */

#if (NRF_SD_BLE_API_VERSION == 3)
#define NRF_BLE_MAX_MTU_SIZE            GATT_MTU_SIZE_DEFAULT                       /**< MTU size used in the softdevice enabling and to reply to a BLE_GATTS_EVT_EXCHANGE_MTU_REQUEST event. */
#endif

#define APP_FEATURE_NOT_SUPPORTED       BLE_GATT_STATUS_ATTERR_APP_BEGIN + 2        /**< Reply when unsupported features are requested. */

#define CENTRAL_LINK_COUNT              0                                           /**< Number of central links used by the application. When changing this number remember to adjust the RAM settings*/
#define PERIPHERAL_LINK_COUNT           1                                           /**< Number of peripheral links used by the application. When changing this number remember to adjust the RAM settings*/

#define DEVICE_NAME                     "Step_Charge"                               /**< Name of device. Will be included in the advertising data. */
#define NUS_SERVICE_UUID_TYPE           BLE_UUID_TYPE_VENDOR_BEGIN                  /**< UUID type for the Nordic UART Service (vendor specific). */

#define APP_ADV_INTERVAL                64                                          /**< The advertising interval (in units of 0.625 ms. This value corresponds to 40 ms). */
#define APP_ADV_TIMEOUT_IN_SECONDS      180                                         /**< The advertising timeout (in units of seconds). */

#define APP_TIMER_PRESCALER             0                                           /**< Value of the RTC1 PRESCALER register. */
#define APP_TIMER_OP_QUEUE_SIZE         4                                           /**< Size of timer operation queues. */

#define MIN_CONN_INTERVAL               MSEC_TO_UNITS(20, UNIT_1_25_MS)             /**< Minimum acceptable connection interval (20 ms), Connection interval uses 1.25 ms units. */
#define MAX_CONN_INTERVAL               MSEC_TO_UNITS(75, UNIT_1_25_MS)             /**< Maximum acceptable connection interval (75 ms), Connection interval uses 1.25 ms units. */
#define SLAVE_LATENCY                   0                                           /**< Slave latency. */
#define CONN_SUP_TIMEOUT                MSEC_TO_UNITS(4000, UNIT_10_MS)             /**< Connection supervisory timeout (4 seconds), Supervision Timeout uses 10 ms units. */
#define FIRST_CONN_PARAMS_UPDATE_DELAY  APP_TIMER_TICKS(5000, APP_TIMER_PRESCALER)  /**< Time from initiating event (connect or start of notification) to first time sd_ble_gap_conn_param_update is called (5 seconds). */
#define NEXT_CONN_PARAMS_UPDATE_DELAY   APP_TIMER_TICKS(30000, APP_TIMER_PRESCALER) /**< Time between each call to sd_ble_gap_conn_param_update after the first call (30 seconds). */
#define MAX_CONN_PARAMS_UPDATE_COUNT    3                                           /**< Number of attempts before giving up the connection parameter negotiation. */

#define DEAD_BEEF                       0xDEADBEEF                                  /**< Value used as error code on stack dump, can be used to identify stack location on stack unwind. */

#define UART_TX_BUF_SIZE                512                                         /**< UART TX buffer size. */
#define UART_RX_BUF_SIZE                64                                          /**< UART RX buffer size. */
/*#define ADC_BUFFER_SIZE 6                                                           //Size of buffer for ADC samples. Buffer size should be multiple of number of adc channels located.*/
#define ADC_BUFFER_SIZE 8                                                           //Size of buffer for ADC samples. Buffer size should be multiple of number of adc channels located.
#define ADC_SAMPLE_RATE     		    1000                                        //ADC sampling frequencyng frequency in ms

static nrf_adc_value_t                  adc_buffer[ADC_BUFFER_SIZE];                /**< ADC buffer. */
static nrf_ppi_channel_t                m_ppi_channel;
static const nrf_drv_timer_t            m_timer = NRF_DRV_TIMER_INSTANCE(2);
static uint8_t                          adc_event_counter = 0;
static uint32_t                         number_of_adc_channels;

static ble_nus_t                        m_nus;                                      /**< Structure to identify the Nordic UART Service. */
static uint16_t                         m_conn_handle = BLE_CONN_HANDLE_INVALID;    /**< Handle of the current connection. */

static ble_uuid_t                       m_adv_uuids[] = {{BLE_UUID_NUS_SERVICE, NUS_SERVICE_UUID_TYPE}};  /**< Universally unique service identifier. */


/**@brief Function for assert macro callback.
 *
 * @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 analyse
 *          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] p_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 the GAP initialization.
 *
 * @details This function will set up all the necessary GAP (Generic Access Profile) parameters of
 *          the device. It also sets the permissions and appearance.
 */
static void gap_params_init(void)
{
    uint32_t                err_code;
    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);

    err_code = sd_ble_gap_device_name_set(&sec_mode,
                                          (const uint8_t *) DEVICE_NAME,
                                          strlen(DEVICE_NAME));
    APP_ERROR_CHECK(err_code);

    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;

    err_code = sd_ble_gap_ppcp_set(&gap_conn_params);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for handling the data from the Nordic UART Service.
 *
 * @details This function will process the data received from the Nordic UART BLE Service and send
 *          it to the UART module.
 *
 * @param[in] p_nus    Nordic UART Service structure.
 * @param[in] p_data   Data to be send to UART module.
 * @param[in] length   Length of the data.
 */
/**@snippet [Handling the data received over BLE] */


static void nus_data_handler(ble_nus_t * p_nus, uint8_t * p_data, uint16_t length)
{
    for (uint32_t i = 0; i < length; i++)
    {
        while (app_uart_put(p_data[i]) != NRF_SUCCESS);
    }
    while (app_uart_put('\r') != NRF_SUCCESS);
    while (app_uart_put('\n') != NRF_SUCCESS);
}

/**@snippet [Handling the data received over BLE] */


/**@brief Function for initializing services that will be used by the application.
 */
static void services_init(void)
{
    uint32_t       err_code;
    ble_nus_init_t nus_init;

    memset(&nus_init, 0, sizeof(nus_init));

    nus_init.data_handler = nus_data_handler;

    err_code = ble_nus_init(&m_nus, &nus_init);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for handling an event from 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)
{
    uint32_t err_code;

    if (p_evt->evt_type == BLE_CONN_PARAMS_EVT_FAILED)
    {
        err_code = sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_CONN_INTERVAL_UNACCEPTABLE);
        APP_ERROR_CHECK(err_code);
    }
}


/**@brief Function for handling errors from the Connection Parameters module.
 *
 * @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)
{
    uint32_t               err_code;
    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;

    err_code = ble_conn_params_init(&cp_init);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for putting the chip into sleep mode.
 *
 * @note This function will not return.
 */
static void sleep_mode_enter(void)
{
    uint32_t err_code = bsp_indication_set(BSP_INDICATE_IDLE);
    APP_ERROR_CHECK(err_code);

    // Prepare wakeup buttons.
    err_code = bsp_btn_ble_sleep_mode_prepare();
    APP_ERROR_CHECK(err_code);

    // Go to system-off mode (this function will not return; wakeup will cause a reset).
    err_code = sd_power_system_off();
    APP_ERROR_CHECK(err_code);
}


/**@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)
{
    uint32_t err_code;

    switch (ble_adv_evt)
    {
        case BLE_ADV_EVT_FAST:
            err_code = bsp_indication_set(BSP_INDICATE_ADVERTISING);
            APP_ERROR_CHECK(err_code);
            break;
        case BLE_ADV_EVT_IDLE:
            sleep_mode_enter();
            break;
        default:
            break;
    }
}


/**@brief Function for the application's SoftDevice event handler.
 *
 * @param[in] p_ble_evt SoftDevice event.
 */
static void on_ble_evt(ble_evt_t * p_ble_evt)
{
    uint32_t err_code;

    switch (p_ble_evt->header.evt_id)
    {
        case BLE_GAP_EVT_CONNECTED:
            err_code = bsp_indication_set(BSP_INDICATE_CONNECTED);
            APP_ERROR_CHECK(err_code);
            m_conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
            break; // BLE_GAP_EVT_CONNECTED

        case BLE_GAP_EVT_DISCONNECTED:
            err_code = bsp_indication_set(BSP_INDICATE_IDLE);
            APP_ERROR_CHECK(err_code);
            m_conn_handle = BLE_CONN_HANDLE_INVALID;
            break; // BLE_GAP_EVT_DISCONNECTED

        case BLE_GAP_EVT_SEC_PARAMS_REQUEST:
            // Pairing not supported
            err_code = sd_ble_gap_sec_params_reply(m_conn_handle, BLE_GAP_SEC_STATUS_PAIRING_NOT_SUPP, NULL, NULL);
            APP_ERROR_CHECK(err_code);
            break; // BLE_GAP_EVT_SEC_PARAMS_REQUEST

        case BLE_GATTS_EVT_SYS_ATTR_MISSING:
            // No system attributes have been stored.
            err_code = sd_ble_gatts_sys_attr_set(m_conn_handle, NULL, 0, 0);
            APP_ERROR_CHECK(err_code);
            break; // BLE_GATTS_EVT_SYS_ATTR_MISSING

        case BLE_GATTC_EVT_TIMEOUT:
            // Disconnect on GATT Client timeout event.
            err_code = sd_ble_gap_disconnect(p_ble_evt->evt.gattc_evt.conn_handle,
                                             BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
            APP_ERROR_CHECK(err_code);
            break; // BLE_GATTC_EVT_TIMEOUT

        case BLE_GATTS_EVT_TIMEOUT:
            // Disconnect on GATT Server timeout event.
            err_code = sd_ble_gap_disconnect(p_ble_evt->evt.gatts_evt.conn_handle,
                                             BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
            APP_ERROR_CHECK(err_code);
            break; // BLE_GATTS_EVT_TIMEOUT

        case BLE_EVT_USER_MEM_REQUEST:
            err_code = sd_ble_user_mem_reply(p_ble_evt->evt.gattc_evt.conn_handle, NULL);
            APP_ERROR_CHECK(err_code);
            break; // BLE_EVT_USER_MEM_REQUEST

        case BLE_GATTS_EVT_RW_AUTHORIZE_REQUEST:
        {
            ble_gatts_evt_rw_authorize_request_t  req;
            ble_gatts_rw_authorize_reply_params_t auth_reply;

            req = p_ble_evt->evt.gatts_evt.params.authorize_request;

            if (req.type != BLE_GATTS_AUTHORIZE_TYPE_INVALID)
            {
                if ((req.request.write.op == BLE_GATTS_OP_PREP_WRITE_REQ)     ||
                    (req.request.write.op == BLE_GATTS_OP_EXEC_WRITE_REQ_NOW) ||
                    (req.request.write.op == BLE_GATTS_OP_EXEC_WRITE_REQ_CANCEL))
                {
                    if (req.type == BLE_GATTS_AUTHORIZE_TYPE_WRITE)
                    {
                        auth_reply.type = BLE_GATTS_AUTHORIZE_TYPE_WRITE;
                    }
                    else
                    {
                        auth_reply.type = BLE_GATTS_AUTHORIZE_TYPE_READ;
                    }
                    auth_reply.params.write.gatt_status = APP_FEATURE_NOT_SUPPORTED;
                    err_code = sd_ble_gatts_rw_authorize_reply(p_ble_evt->evt.gatts_evt.conn_handle,
                                                               &auth_reply);
                    APP_ERROR_CHECK(err_code);
                }
            }
        } break; // BLE_GATTS_EVT_RW_AUTHORIZE_REQUEST

#if (NRF_SD_BLE_API_VERSION == 3)
        case BLE_GATTS_EVT_EXCHANGE_MTU_REQUEST:
            err_code = sd_ble_gatts_exchange_mtu_reply(p_ble_evt->evt.gatts_evt.conn_handle,
                                                       NRF_BLE_MAX_MTU_SIZE);
            APP_ERROR_CHECK(err_code);
            break; // BLE_GATTS_EVT_EXCHANGE_MTU_REQUEST
#endif

        default:
            // No implementation needed.
            break;
    }
}


/**@brief Function for dispatching a SoftDevice event to all modules with a SoftDevice
 *        event handler.
 *
 * @details This function is called from the SoftDevice event interrupt handler after a
 *          SoftDevice event has been received.
 *
 * @param[in] p_ble_evt  SoftDevice event.
 */
static void ble_evt_dispatch(ble_evt_t * p_ble_evt)
{
    ble_conn_params_on_ble_evt(p_ble_evt);
    ble_nus_on_ble_evt(&m_nus, p_ble_evt);
    on_ble_evt(p_ble_evt);
    ble_advertising_on_ble_evt(p_ble_evt);
    bsp_btn_ble_on_ble_evt(p_ble_evt);

}


/**@brief Function for the SoftDevice initialization.
 *
 * @details This function initializes the SoftDevice and the BLE event interrupt.
 */
static void ble_stack_init(void)
{
    uint32_t err_code;

    nrf_clock_lf_cfg_t clock_lf_cfg = NRF_CLOCK_LFCLKSRC;

    // Initialize SoftDevice.
    SOFTDEVICE_HANDLER_INIT(&clock_lf_cfg, NULL);

    ble_enable_params_t ble_enable_params;
    err_code = softdevice_enable_get_default_config(CENTRAL_LINK_COUNT,
                                                    PERIPHERAL_LINK_COUNT,
                                                    &ble_enable_params);
    APP_ERROR_CHECK(err_code);

    //Check the ram settings against the used number of links
    CHECK_RAM_START_ADDR(CENTRAL_LINK_COUNT,PERIPHERAL_LINK_COUNT);

    // Enable BLE stack.
#if (NRF_SD_BLE_API_VERSION == 3)
    ble_enable_params.gatt_enable_params.att_mtu = NRF_BLE_MAX_MTU_SIZE;
#endif
    err_code = softdevice_enable(&ble_enable_params);
    APP_ERROR_CHECK(err_code);

    // Subscribe for BLE events.
    err_code = softdevice_ble_evt_handler_set(ble_evt_dispatch);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for handling events from the BSP module.
 *
 * @param[in]   event   Event generated by button press.
 */
void bsp_event_handler(bsp_event_t event)
{
    uint32_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();
                if (err_code != NRF_ERROR_INVALID_STATE)
                {
                    APP_ERROR_CHECK(err_code);
                }
            }
            break;

        default:
            break;
    }
}


/**@brief   Function for handling app_uart events.
 *
 * @details This function will receive a single character from the app_uart module and append it to
 *          a string. The string will be be sent over BLE when the last character received was a
 *          'new line' i.e '\r\n' (hex 0x0D) or if the string has reached a length of
 *          @ref NUS_MAX_DATA_LENGTH.
 */
/**@snippet [Handling the data received over UART] */

void uart_event_handle(app_uart_evt_t * p_event)
{
    static uint8_t data_array[BLE_NUS_MAX_DATA_LEN];
    static uint8_t index = 0;
    uint32_t       err_code;

    switch (p_event->evt_type)
    {
        case APP_UART_DATA_READY:
            UNUSED_VARIABLE(app_uart_get(&data_array[index]));
            index++;

            if ((data_array[index - 1] == '\n') || (index >= (BLE_NUS_MAX_DATA_LEN)))
            {
                err_code = ble_nus_string_send(&m_nus, data_array, index);
                if (err_code != NRF_ERROR_INVALID_STATE)
                {
                    APP_ERROR_CHECK(err_code);
                }

                index = 0;
            }
            break;

        case APP_UART_COMMUNICATION_ERROR:
            APP_ERROR_HANDLER(p_event->data.error_communication);
            break;

        case APP_UART_FIFO_ERROR:
            APP_ERROR_HANDLER(p_event->data.error_code);
            break;

        default:
            break;
    }
}

/**@snippet [Handling the data received over UART] */


/**@brief  Function for initializing the UART module.
 */
/**@snippet [UART Initialization] */

static void uart_init(void)
{
    uint32_t                     err_code;
    const app_uart_comm_params_t comm_params =
    {
        RX_PIN_NUMBER,
        TX_PIN_NUMBER,
        RTS_PIN_NUMBER,
        CTS_PIN_NUMBER,
        APP_UART_FLOW_CONTROL_DISABLED,
        false,
        UART_BAUDRATE_BAUDRATE_Baud115200
    };

    APP_UART_FIFO_INIT( &comm_params,
                       UART_RX_BUF_SIZE,
                       UART_TX_BUF_SIZE,
                       uart_event_handle,
                       APP_IRQ_PRIORITY_LOWEST,
                       err_code);
    APP_ERROR_CHECK(err_code);
}

/**@snippet [UART Initialization] */


/**@brief Function for initializing the Advertising functionality.
 */
static void advertising_init(void)
{
    uint32_t               err_code;
    ble_advdata_t          advdata;
    ble_advdata_t          scanrsp;
    ble_adv_modes_config_t options;

    // Build advertising data struct to pass into @ref ble_advertising_init.
    memset(&advdata, 0, sizeof(advdata));
    advdata.name_type          = BLE_ADVDATA_FULL_NAME;
    advdata.include_appearance = false;
    advdata.flags              = BLE_GAP_ADV_FLAGS_LE_ONLY_LIMITED_DISC_MODE;

    memset(&scanrsp, 0, sizeof(scanrsp));
    scanrsp.uuids_complete.uuid_cnt = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
    scanrsp.uuids_complete.p_uuids  = m_adv_uuids;

    memset(&options, 0, sizeof(options));
    options.ble_adv_fast_enabled  = true;
    options.ble_adv_fast_interval = APP_ADV_INTERVAL;
    options.ble_adv_fast_timeout  = APP_ADV_TIMEOUT_IN_SECONDS;

    err_code = ble_advertising_init(&advdata, &scanrsp, &options, on_adv_evt, NULL);
    APP_ERROR_CHECK(err_code);
}


/**@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;

    uint32_t err_code = bsp_init(BSP_INIT_LED | BSP_INIT_BUTTONS,
                                 APP_TIMER_TICKS(100, APP_TIMER_PRESCALER),
                                 bsp_event_handler);
    APP_ERROR_CHECK(err_code);

    err_code = bsp_btn_ble_init(NULL, &startup_event);
    APP_ERROR_CHECK(err_code);

    *p_erase_bonds = (startup_event == BSP_EVENT_CLEAR_BONDING_DATA);
}


/**@brief Function for placing the application in low power state while waiting for events.
 */
static void power_manage(void)
{
    uint32_t err_code = sd_app_evt_wait();
    APP_ERROR_CHECK(err_code);
}

/**
 * @brief ADC interrupt handler.
 * Prints ADC results on hardware UART and over BLE via the NUS service.
 */
static void adc_event_handler(nrf_drv_adc_evt_t const * p_event)
{
    uint8_t adc_result[ADC_BUFFER_SIZE*2];
		
	
    if (p_event->type == NRF_DRV_ADC_EVT_DONE)
    {
			
        adc_event_counter++;
        printf("  adc event counter: %d\r\n", adc_event_counter);
        for (uint32_t i = 0; i < p_event->data.done.size; i++)
        {
            printf("ADC value channel %d: %d\r\n", (int)(i % number_of_adc_channels), p_event->data.done.p_buffer[i]);
            adc_result[(i*2)] = p_event->data.done.p_buffer[i] >> 8;
            adc_result[(i*2)+1] = p_event->data.done.p_buffer[i];
        }
			
        /*if(ADC_BUFFER_SIZE <= 10)*/
				if(ADC_BUFFER_SIZE <= 10)
        {
						/*ble_nus_string_send(&m_nus, &adc_result[0], ADC_BUFFER_SIZE*2);*/
						
            ble_nus_string_send(&m_nus, &adc_result[0], ADC_BUFFER_SIZE*2);
					  
        }	
        APP_ERROR_CHECK(nrf_drv_adc_buffer_convert(adc_buffer,ADC_BUFFER_SIZE));
        LEDS_INVERT(BSP_LED_3_MASK);
    }
}

/**
 * @brief TIMER interrupt handler.
 */
void timer_handler(nrf_timer_event_t event_type, void* p_context)
{
}

void adc_sampling_event_enable(void)
{
    ret_code_t err_code = nrf_drv_ppi_channel_enable(m_ppi_channel);
    APP_ERROR_CHECK(err_code);
}

/**
 * @brief ADC initialization.
 */
static void adc_config(void)
{
    ret_code_t ret_code;
	
    //Initialize ADC
    nrf_drv_adc_config_t config = NRF_DRV_ADC_DEFAULT_CONFIG;
    ret_code = nrf_drv_adc_init(&config, adc_event_handler);
    APP_ERROR_CHECK(ret_code);
	
    //Configure and enable ADC channel 0
    static nrf_drv_adc_channel_t m_channel_0_config = NRF_DRV_ADC_DEFAULT_CHANNEL(NRF_ADC_CONFIG_INPUT_0); 
    m_channel_0_config.config.config.input = NRF_ADC_CONFIG_SCALING_INPUT_FULL_SCALE;
    nrf_drv_adc_channel_enable(&m_channel_0_config);
	
    //Configure and enable ADC channel 1
    static nrf_drv_adc_channel_t m_channel_1_config = NRF_DRV_ADC_DEFAULT_CHANNEL(NRF_ADC_CONFIG_INPUT_1); 
    m_channel_1_config.config.config.input = NRF_ADC_CONFIG_SCALING_INPUT_FULL_SCALE;
    nrf_drv_adc_channel_enable(&m_channel_1_config);
	
    //Configure and enable ADC channel 2
    static nrf_drv_adc_channel_t m_channel_2_config = NRF_DRV_ADC_DEFAULT_CHANNEL(NRF_ADC_CONFIG_INPUT_2);	
    m_channel_2_config.config.config.input = NRF_ADC_CONFIG_SCALING_INPUT_FULL_SCALE;
    nrf_drv_adc_channel_enable(&m_channel_2_config);
		
		//Configure and enable ADC channel 3
    static nrf_drv_adc_channel_t m_channel_3_config = NRF_DRV_ADC_DEFAULT_CHANNEL(NRF_ADC_CONFIG_INPUT_3);	
    m_channel_3_config.config.config.input = NRF_ADC_CONFIG_SCALING_INPUT_FULL_SCALE;
    nrf_drv_adc_channel_enable(&m_channel_3_config);
		
		//Configure and enable ADC channel 4
    static nrf_drv_adc_channel_t m_channel_4_config = NRF_DRV_ADC_DEFAULT_CHANNEL(NRF_ADC_CONFIG_INPUT_4);	
    m_channel_4_config.config.config.input = NRF_ADC_CONFIG_SCALING_INPUT_FULL_SCALE;
    nrf_drv_adc_channel_enable(&m_channel_4_config);
		
		//Configure and enable ADC channel 5
    static nrf_drv_adc_channel_t m_channel_5_config = NRF_DRV_ADC_DEFAULT_CHANNEL(NRF_ADC_CONFIG_INPUT_5);	
    m_channel_5_config.config.config.input = NRF_ADC_CONFIG_SCALING_INPUT_FULL_SCALE;
    nrf_drv_adc_channel_enable(&m_channel_5_config);
		
		//Configure and enable ADC channel 6
    static nrf_drv_adc_channel_t m_channel_6_config = NRF_DRV_ADC_DEFAULT_CHANNEL(NRF_ADC_CONFIG_INPUT_6);	
    m_channel_6_config.config.config.input = NRF_ADC_CONFIG_SCALING_INPUT_FULL_SCALE;
    nrf_drv_adc_channel_enable(&m_channel_6_config);
		
		//Configure and enable ADC channel 7
    static nrf_drv_adc_channel_t m_channel_7_config = NRF_DRV_ADC_DEFAULT_CHANNEL(NRF_ADC_CONFIG_INPUT_7);	
    m_channel_7_config.config.config.input = NRF_ADC_CONFIG_SCALING_INPUT_FULL_SCALE;
    nrf_drv_adc_channel_enable(&m_channel_7_config);
	
    number_of_adc_channels = 8;    //Set equal to the number of configured ADC channels, for the sake of UART output.
}

/**
 * @brief Setup sampling events.
 */
void adc_sampling_event_init(void)
{
    ret_code_t err_code;
    err_code = nrf_drv_ppi_init();
    APP_ERROR_CHECK(err_code);

    nrf_drv_timer_config_t timer_cfg = NRF_DRV_TIMER_DEFAULT_CONFIG;
    err_code = nrf_drv_timer_init(&m_timer, &timer_cfg, timer_handler);
    APP_ERROR_CHECK(err_code);

    /* setup m_timer for compare event */
    uint32_t time_ticks = nrf_drv_timer_ms_to_ticks(&m_timer, ADC_SAMPLE_RATE);
    nrf_drv_timer_extended_compare(&m_timer, NRF_TIMER_CC_CHANNEL0, time_ticks, NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK, true);
    nrf_drv_timer_enable(&m_timer);

    uint32_t timer_compare_event_addr = nrf_drv_timer_compare_event_address_get(&m_timer, NRF_TIMER_CC_CHANNEL0);
    uint32_t adc_sample_event_addr = nrf_drv_adc_start_task_get();

    /* setup ppi channel so that timer compare event is triggering sample task in SAADC */
    err_code = nrf_drv_ppi_channel_alloc(&m_ppi_channel);
    APP_ERROR_CHECK(err_code);
    
    err_code = nrf_drv_ppi_channel_assign(m_ppi_channel, timer_compare_event_addr, adc_sample_event_addr);  //NRF_ADC->TASKS_START);
    APP_ERROR_CHECK(err_code);
}

/**@brief Application main function.
 */
int main(void)
{
    uint32_t err_code;
    bool erase_bonds;

    // Initialize.
    APP_TIMER_INIT(APP_TIMER_PRESCALER, APP_TIMER_OP_QUEUE_SIZE, false);
    uart_init();

    buttons_leds_init(&erase_bonds);
    ble_stack_init();
    gap_params_init();
    services_init();
    advertising_init();
    conn_params_init();

    adc_sampling_event_init();
    adc_config();
    APP_ERROR_CHECK(nrf_drv_adc_buffer_convert(adc_buffer,ADC_BUFFER_SIZE));
    adc_sampling_event_enable();
	
    printf("\r\nUART Start - with ADC !\r\n");
    err_code = ble_advertising_start(BLE_ADV_MODE_FAST);
    APP_ERROR_CHECK(err_code);

    // Enter main loop.
    for (;;)
    {
        power_manage();
    }
}


/**
 * @}
 */

. .

I have noted that the current consumption is too hight for my scope (about 1.7mA). My idea is to 'reduce' the code with only acquisition of 6 ADC and trasmission it via Bluetooth. I know there is the possibility to siwitch off the UART but I don't know what is the section to make it. An other possibility to reduce the current consumption is to imprve the adbvertising internval. So is it possible to improve the SLAVE_LATENCy from 0 to 4?


Are there other point useful for my scope? My scope is acquisiton the 6 ADC channel and trasmittion data via bluetooth.

Thanks a lot and best regards

Angelo

[L.B.]

If you need to send data continuously, then I believe that increasing the advertising interval is a good way to do it.

I've been developing firmware for the same chip, and was able to use the RTC to periodically wake up the system and sleep during the rest of the time, then the consumption is greatly reduced (4 uA). But you must leave only the RTC to be on, everything else should be off. I use sd_softdevice_disable()  instead of sd_system_power_off() and also

while(1){       

__SEV();
__WFE();
__WFE();

}

Hope this helps!

Regards,

L. B.

[L.B.]

More like:

...

sd_softdevice_disable();

for (;;)
    {
        __SEV();
        __WFE();
        __WFE();
    }

//And the RTC should wake up the system - then you must put some logic in the RTC handler.

[L.B.]

No, I mean software flag. This is what I do in my code:

In my main loop I have:

void main(void){

    //Init code should be here:

    .....

  //Main loop is here:

  while(1){
        if(rtc_trigger){
            rtc_trigger = 0;

            //Do stuff here. Init peripherals, bluetooth, send data, etc.

            //Then uninit everything to save power. Everything except RTC.
        }

        __SEV();
        __WFE();
        __WFE();
    }

}

In my RTC handler I have:

void RTC1_IRQHandler(void){
    if(NRF_RTC1->EVENTS_COMPARE[0]){
        NRF_RTC1->EVENTS_COMPARE[0] = 0;
        NRF_RTC1->TASKS_CLEAR = 1;
        rtc_trigger = 1; //This is the software flag I was talking about
    }
}

IMPORTANT: use non-softdevice API for the RTC, because once you invoke sd_softdevice_disable() everything related to it will stop working ... I suggest you use either direct register access or use the low-level drivers (examples are located in nRF5_SDK_xx.x.x_xxxxxx/examples/peripheral)

[L.B.]

And about your second question - no, my suggestion was to increase this value:

#define APP_ADV_INTERVAL                 1600                                        /**< The advertising interval (in units of 0.625 ms.

Note that this number (1600) must be multiplied by 0.625 ms to get the number in seconds.

[Angelo Cotroneo]

Thanks for you help. So I need to include the library (regarding the RTC) in my project. Correct? I put the file belew. How can I modify my sorce code?

nrf_drv_rtc.h

Fullscreen nrf_drv_rtc.c Download

/**
 * Copyright (c) 2014 - 2017, 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.
 * 
 */

#include "sdk_common.h"
#if NRF_MODULE_ENABLED(RTC)
#define ENABLED_RTC_COUNT (RTC0_ENABLED+RTC1_ENABLED+RTC2_ENABLED)
#if ENABLED_RTC_COUNT

#include "nrf_drv_rtc.h"
#include "nrf_rtc.h"
#include "nrf_assert.h"
#include "app_util_platform.h"

#define NRF_LOG_MODULE_NAME "RTC"

#if RTC_CONFIG_LOG_ENABLED
#define NRF_LOG_LEVEL       RTC_CONFIG_LOG_LEVEL
#define NRF_LOG_INFO_COLOR  RTC_CONFIG_INFO_COLOR
#define NRF_LOG_DEBUG_COLOR RTC_CONFIG_DEBUG_COLOR
#define EVT_TO_STR(event)   (event == NRF_RTC_EVENT_TICK ? "NRF_RTC_EVENT_TICK" :               \
                            (event == NRF_RTC_EVENT_OVERFLOW ? "NRF_RTC_EVENT_OVERFLOW" :       \
                            (event == NRF_RTC_EVENT_COMPARE_0 ? "NRF_RTC_EVENT_COMPARE_0" :     \
                            (event == NRF_RTC_EVENT_COMPARE_1 ? "NRF_RTC_EVENT_COMPARE_1" :     \
                            (event == NRF_RTC_EVENT_COMPARE_2 ? "NRF_RTC_EVENT_COMPARE_2" :     \
                            (event == NRF_RTC_EVENT_COMPARE_3 ? "NRF_RTC_EVENT_COMPARE_3" : "UNKNOWN EVENT")
#else //RTC_CONFIG_LOG_ENABLED
#define EVT_TO_STR(event)   ""
#define NRF_LOG_LEVEL       0
#endif //RTC_CONFIG_LOG_ENABLED
#include "nrf_log.h"
#include "nrf_log_ctrl.h"

/**@brief RTC driver instance control block structure. */
typedef struct
{
    nrf_drv_state_t state;        /**< Instance state. */
    bool            reliable;     /**< Reliable mode flag. */
    uint8_t         tick_latency; /**< Maximum length of interrupt handler in ticks (max 7.7 ms). */
} nrf_drv_rtc_cb_t;

// User callbacks local storage.
static nrf_drv_rtc_handler_t m_handlers[ENABLED_RTC_COUNT];
static nrf_drv_rtc_cb_t      m_cb[ENABLED_RTC_COUNT];

ret_code_t nrf_drv_rtc_init(nrf_drv_rtc_t const * const p_instance,
                            nrf_drv_rtc_config_t const * p_config,
                            nrf_drv_rtc_handler_t handler)
{
    ASSERT(p_config);

    ret_code_t err_code;

    if (handler)
    {
        m_handlers[p_instance->instance_id] = handler;
    }
    else
    {
        err_code = NRF_ERROR_INVALID_PARAM;
        NRF_LOG_WARNING("Function: %s, error code: %s.\r\n", (uint32_t)__func__, (uint32_t)ERR_TO_STR(err_code));
        return err_code;
    }

    if (m_cb[p_instance->instance_id].state != NRF_DRV_STATE_UNINITIALIZED)
    {
        err_code = NRF_ERROR_INVALID_STATE;
        NRF_LOG_WARNING("Function: %s, error code: %s.\r\n", (uint32_t)__func__, (uint32_t)ERR_TO_STR(err_code));
        return err_code;
    }

    nrf_drv_common_irq_enable(p_instance->irq, p_config->interrupt_priority);
    nrf_rtc_prescaler_set(p_instance->p_reg, p_config->prescaler);
    m_cb[p_instance->instance_id].reliable     = p_config->reliable;
    m_cb[p_instance->instance_id].tick_latency = p_config->tick_latency;
    m_cb[p_instance->instance_id].state        = NRF_DRV_STATE_INITIALIZED;

    err_code = NRF_SUCCESS;
    NRF_LOG_INFO("Function: %s, error code: %s.\r\n", (uint32_t)__func__, (uint32_t)ERR_TO_STR(err_code));
    return err_code;
}

void nrf_drv_rtc_uninit(nrf_drv_rtc_t const * const p_instance)
{
    uint32_t mask = NRF_RTC_INT_TICK_MASK     |
                    NRF_RTC_INT_OVERFLOW_MASK |
                    NRF_RTC_INT_COMPARE0_MASK |
                    NRF_RTC_INT_COMPARE1_MASK |
                    NRF_RTC_INT_COMPARE2_MASK |
                    NRF_RTC_INT_COMPARE3_MASK;
    ASSERT(m_cb[p_instance->instance_id].state != NRF_DRV_STATE_UNINITIALIZED);

    nrf_drv_common_irq_disable(p_instance->irq);

    nrf_rtc_task_trigger(p_instance->p_reg, NRF_RTC_TASK_STOP);
    nrf_rtc_event_disable(p_instance->p_reg, mask);
    nrf_rtc_int_disable(p_instance->p_reg, mask);

    m_cb[p_instance->instance_id].state = NRF_DRV_STATE_UNINITIALIZED;
    NRF_LOG_INFO("Uninitialized.\r\n");
}

void nrf_drv_rtc_enable(nrf_drv_rtc_t const * const p_instance)
{
    ASSERT(m_cb[p_instance->instance_id].state == NRF_DRV_STATE_INITIALIZED);

    nrf_rtc_task_trigger(p_instance->p_reg, NRF_RTC_TASK_START);
    m_cb[p_instance->instance_id].state = NRF_DRV_STATE_POWERED_ON;
    NRF_LOG_INFO("Enabled.\r\n");
}

void nrf_drv_rtc_disable(nrf_drv_rtc_t const * const p_instance)
{
    ASSERT(m_cb[p_instance->instance_id].state != NRF_DRV_STATE_UNINITIALIZED);

    nrf_rtc_task_trigger(p_instance->p_reg, NRF_RTC_TASK_STOP);
    m_cb[p_instance->instance_id].state = NRF_DRV_STATE_INITIALIZED;
    NRF_LOG_INFO("Disabled.\r\n");
}

ret_code_t nrf_drv_rtc_cc_disable(nrf_drv_rtc_t const * const p_instance, uint32_t channel)
{
    ASSERT(m_cb[p_instance->instance_id].state != NRF_DRV_STATE_UNINITIALIZED);
    ASSERT(channel<p_instance->cc_channel_count);

    ret_code_t err_code;
    uint32_t int_mask = RTC_CHANNEL_INT_MASK(channel);
    nrf_rtc_event_t event    = RTC_CHANNEL_EVENT_ADDR(channel);

    nrf_rtc_event_disable(p_instance->p_reg,int_mask);
    if (nrf_rtc_int_is_enabled(p_instance->p_reg,int_mask))
    {
        nrf_rtc_int_disable(p_instance->p_reg,int_mask);
        if (nrf_rtc_event_pending(p_instance->p_reg,event))
        {
            nrf_rtc_event_clear(p_instance->p_reg,event);
            err_code = NRF_ERROR_TIMEOUT;
            NRF_LOG_WARNING("Function: %s, error code: %s.\r\n", (uint32_t)__func__, (uint32_t)ERR_TO_STR(err_code));
            return err_code;
        }
    }
    NRF_LOG_INFO("RTC id: %d, channel disabled: %d.\r\n", p_instance->instance_id, channel);
    err_code = NRF_SUCCESS;
    NRF_LOG_INFO("Function: %s, error code: %s.\r\n", (uint32_t)__func__, (uint32_t)ERR_TO_STR(err_code));
    return err_code;
}

ret_code_t nrf_drv_rtc_cc_set(nrf_drv_rtc_t const * const p_instance,
                              uint32_t channel,
                              uint32_t val,
                              bool enable_irq)
{
    ASSERT(m_cb[p_instance->instance_id].state != NRF_DRV_STATE_UNINITIALIZED);
    ASSERT(channel<p_instance->cc_channel_count);

    ret_code_t err_code;
    uint32_t int_mask = RTC_CHANNEL_INT_MASK(channel);
    nrf_rtc_event_t event    = RTC_CHANNEL_EVENT_ADDR(channel);

    nrf_rtc_event_disable(p_instance->p_reg, int_mask);
    nrf_rtc_int_disable(p_instance->p_reg, int_mask);

    val = RTC_WRAP(val);
    if (m_cb[p_instance->instance_id].reliable)
    {
        nrf_rtc_cc_set(p_instance->p_reg,channel,val);
        uint32_t cnt = nrf_rtc_counter_get(p_instance->p_reg);
        int32_t diff = cnt - val;
        if (cnt < val)
        {
            diff += RTC_COUNTER_COUNTER_Msk;
        }
        if (diff < m_cb[p_instance->instance_id].tick_latency)
        {
            err_code = NRF_ERROR_TIMEOUT;
            NRF_LOG_WARNING("Function: %s, error code: %s.\r\n", (uint32_t)__func__, (uint32_t)ERR_TO_STR(err_code));
            return err_code;
        }
    }
    else
    {
        nrf_rtc_cc_set(p_instance->p_reg,channel,val);
    }

    if (enable_irq)
    {
        nrf_rtc_event_clear(p_instance->p_reg,event);
        nrf_rtc_int_enable(p_instance->p_reg, int_mask);
    }
    nrf_rtc_event_enable(p_instance->p_reg,int_mask);

    NRF_LOG_INFO("RTC id: %d, channel enabled: %d, compare value: %d.\r\n", p_instance->instance_id, channel, val);
    err_code = NRF_SUCCESS;
    NRF_LOG_INFO("Function: %s, error code: %s.\r\n", (uint32_t)__func__, (uint32_t)ERR_TO_STR(err_code));
    return err_code;
}

void nrf_drv_rtc_tick_enable(nrf_drv_rtc_t const * const p_instance, bool enable_irq)
{
    nrf_rtc_event_t event = NRF_RTC_EVENT_TICK;
    uint32_t mask = NRF_RTC_INT_TICK_MASK;

    nrf_rtc_event_clear(p_instance->p_reg, event);
    nrf_rtc_event_enable(p_instance->p_reg, mask);
    if (enable_irq)
    {
        nrf_rtc_int_enable(p_instance->p_reg, mask);
    }
    NRF_LOG_INFO("Tick events enabled.\r\n");
}

void nrf_drv_rtc_tick_disable(nrf_drv_rtc_t const * const p_instance)
{
    uint32_t mask = NRF_RTC_INT_TICK_MASK;

    nrf_rtc_event_disable(p_instance->p_reg, mask);
    nrf_rtc_int_disable(p_instance->p_reg, mask);
    NRF_LOG_INFO("Tick events disabled.\r\n");
}

void nrf_drv_rtc_overflow_enable(nrf_drv_rtc_t const * const p_instance, bool enable_irq)
{
    nrf_rtc_event_t event = NRF_RTC_EVENT_OVERFLOW;
    uint32_t mask = NRF_RTC_INT_OVERFLOW_MASK;

    nrf_rtc_event_clear(p_instance->p_reg, event);
    nrf_rtc_event_enable(p_instance->p_reg, mask);
    if (enable_irq)
    {
        nrf_rtc_int_enable(p_instance->p_reg, mask);
    }
}
void nrf_drv_rtc_overflow_disable(nrf_drv_rtc_t const * const p_instance)
{
    uint32_t mask = NRF_RTC_INT_OVERFLOW_MASK;
    nrf_rtc_event_disable(p_instance->p_reg, mask);
    nrf_rtc_int_disable(p_instance->p_reg, mask);
}

uint32_t nrf_drv_rtc_max_ticks_get(nrf_drv_rtc_t const * const p_instance)
{
    uint32_t ticks;
    if (m_cb[p_instance->instance_id].reliable)
    {
        ticks = RTC_COUNTER_COUNTER_Msk - m_cb[p_instance->instance_id].tick_latency;
    }
    else
    {
        ticks = RTC_COUNTER_COUNTER_Msk;
    }
    return ticks;
}

/**@brief Generic function for handling RTC interrupt
 *
 * @param[in]  p_reg         Pointer to instance register structure.
 * @param[in]  instance_id   Index of instance.
 */
__STATIC_INLINE void nrf_drv_rtc_int_handler(NRF_RTC_Type * p_reg,
                                             uint32_t instance_id,
                                             uint32_t channel_count)
{
    uint32_t i;
    uint32_t int_mask = (uint32_t)NRF_RTC_INT_COMPARE0_MASK;
    nrf_rtc_event_t event = NRF_RTC_EVENT_COMPARE_0;

    for (i = 0; i < channel_count; i++)
    {
        if (nrf_rtc_int_is_enabled(p_reg,int_mask) && nrf_rtc_event_pending(p_reg,event))
        {
            nrf_rtc_event_disable(p_reg,int_mask);
            nrf_rtc_int_disable(p_reg,int_mask);
            nrf_rtc_event_clear(p_reg,event);
            NRF_LOG_DEBUG("Event: %s, instance id: %d.\r\n",
                         (uint32_t)EVT_TO_STR(event), (uint32_t)instance_id);
            m_handlers[instance_id]((nrf_drv_rtc_int_type_t)i);
        }
        int_mask <<= 1;
        event    = (nrf_rtc_event_t)((uint32_t)event + sizeof(uint32_t));
    }
    event = NRF_RTC_EVENT_TICK;
    if (nrf_rtc_int_is_enabled(p_reg,NRF_RTC_INT_TICK_MASK) &&
        nrf_rtc_event_pending(p_reg, event))
    {
        nrf_rtc_event_clear(p_reg, event);
        NRF_LOG_DEBUG("Event: %s, instance id: %d.\r\n", (uint32_t)EVT_TO_STR(event), instance_id);
        m_handlers[instance_id](NRF_DRV_RTC_INT_TICK);
    }

    event = NRF_RTC_EVENT_OVERFLOW;
    if (nrf_rtc_int_is_enabled(p_reg,NRF_RTC_INT_OVERFLOW_MASK) &&
        nrf_rtc_event_pending(p_reg, event))
    {
        nrf_rtc_event_clear(p_reg,event);
        NRF_LOG_DEBUG("Event: %s, instance id: %d.\r\n", (uint32_t)EVT_TO_STR(event), instance_id);
        m_handlers[instance_id](NRF_DRV_RTC_INT_OVERFLOW);
    }
}

#if NRF_MODULE_ENABLED(RTC0)
void RTC0_IRQHandler(void)
{
    nrf_drv_rtc_int_handler(NRF_RTC0,RTC0_INSTANCE_INDEX, NRF_RTC_CC_CHANNEL_COUNT(0));
}
#endif

#if NRF_MODULE_ENABLED(RTC1)
void RTC1_IRQHandler(void)
{
    nrf_drv_rtc_int_handler(NRF_RTC1,RTC1_INSTANCE_INDEX, NRF_RTC_CC_CHANNEL_COUNT(1));
}
#endif

#if NRF_MODULE_ENABLED(RTC2)
void RTC2_IRQHandler(void)
{
    nrf_drv_rtc_int_handler(NRF_RTC2,RTC2_INSTANCE_INDEX, NRF_RTC_CC_CHANNEL_COUNT(2));
}
#endif
#endif //ENABLED_RTC_COUNT
#endif //NRF_MODULE_ENABLED(RTC)

[Angelo Cotroneo]

Attach you can foind the ".c"

Fullscreen 1832.nrf_drv_rtc.c Download

/**
 * Copyright (c) 2014 - 2017, 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
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 *    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
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 * 
 */

#include "sdk_common.h"
#if NRF_MODULE_ENABLED(RTC)
#define ENABLED_RTC_COUNT (RTC0_ENABLED+RTC1_ENABLED+RTC2_ENABLED)
#if ENABLED_RTC_COUNT

#include "nrf_drv_rtc.h"
#include "nrf_rtc.h"
#include "nrf_assert.h"
#include "app_util_platform.h"

#define NRF_LOG_MODULE_NAME "RTC"

#if RTC_CONFIG_LOG_ENABLED
#define NRF_LOG_LEVEL       RTC_CONFIG_LOG_LEVEL
#define NRF_LOG_INFO_COLOR  RTC_CONFIG_INFO_COLOR
#define NRF_LOG_DEBUG_COLOR RTC_CONFIG_DEBUG_COLOR
#define EVT_TO_STR(event)   (event == NRF_RTC_EVENT_TICK ? "NRF_RTC_EVENT_TICK" :               \
                            (event == NRF_RTC_EVENT_OVERFLOW ? "NRF_RTC_EVENT_OVERFLOW" :       \
                            (event == NRF_RTC_EVENT_COMPARE_0 ? "NRF_RTC_EVENT_COMPARE_0" :     \
                            (event == NRF_RTC_EVENT_COMPARE_1 ? "NRF_RTC_EVENT_COMPARE_1" :     \
                            (event == NRF_RTC_EVENT_COMPARE_2 ? "NRF_RTC_EVENT_COMPARE_2" :     \
                            (event == NRF_RTC_EVENT_COMPARE_3 ? "NRF_RTC_EVENT_COMPARE_3" : "UNKNOWN EVENT")
#else //RTC_CONFIG_LOG_ENABLED
#define EVT_TO_STR(event)   ""
#define NRF_LOG_LEVEL       0
#endif //RTC_CONFIG_LOG_ENABLED
#include "nrf_log.h"
#include "nrf_log_ctrl.h"

/**@brief RTC driver instance control block structure. */
typedef struct
{
    nrf_drv_state_t state;        /**< Instance state. */
    bool            reliable;     /**< Reliable mode flag. */
    uint8_t         tick_latency; /**< Maximum length of interrupt handler in ticks (max 7.7 ms). */
} nrf_drv_rtc_cb_t;

// User callbacks local storage.
static nrf_drv_rtc_handler_t m_handlers[ENABLED_RTC_COUNT];
static nrf_drv_rtc_cb_t      m_cb[ENABLED_RTC_COUNT];

ret_code_t nrf_drv_rtc_init(nrf_drv_rtc_t const * const p_instance,
                            nrf_drv_rtc_config_t const * p_config,
                            nrf_drv_rtc_handler_t handler)
{
    ASSERT(p_config);

    ret_code_t err_code;

    if (handler)
    {
        m_handlers[p_instance->instance_id] = handler;
    }
    else
    {
        err_code = NRF_ERROR_INVALID_PARAM;
        NRF_LOG_WARNING("Function: %s, error code: %s.\r\n", (uint32_t)__func__, (uint32_t)ERR_TO_STR(err_code));
        return err_code;
    }

    if (m_cb[p_instance->instance_id].state != NRF_DRV_STATE_UNINITIALIZED)
    {
        err_code = NRF_ERROR_INVALID_STATE;
        NRF_LOG_WARNING("Function: %s, error code: %s.\r\n", (uint32_t)__func__, (uint32_t)ERR_TO_STR(err_code));
        return err_code;
    }

    nrf_drv_common_irq_enable(p_instance->irq, p_config->interrupt_priority);
    nrf_rtc_prescaler_set(p_instance->p_reg, p_config->prescaler);
    m_cb[p_instance->instance_id].reliable     = p_config->reliable;
    m_cb[p_instance->instance_id].tick_latency = p_config->tick_latency;
    m_cb[p_instance->instance_id].state        = NRF_DRV_STATE_INITIALIZED;

    err_code = NRF_SUCCESS;
    NRF_LOG_INFO("Function: %s, error code: %s.\r\n", (uint32_t)__func__, (uint32_t)ERR_TO_STR(err_code));
    return err_code;
}

void nrf_drv_rtc_uninit(nrf_drv_rtc_t const * const p_instance)
{
    uint32_t mask = NRF_RTC_INT_TICK_MASK     |
                    NRF_RTC_INT_OVERFLOW_MASK |
                    NRF_RTC_INT_COMPARE0_MASK |
                    NRF_RTC_INT_COMPARE1_MASK |
                    NRF_RTC_INT_COMPARE2_MASK |
                    NRF_RTC_INT_COMPARE3_MASK;
    ASSERT(m_cb[p_instance->instance_id].state != NRF_DRV_STATE_UNINITIALIZED);

    nrf_drv_common_irq_disable(p_instance->irq);

    nrf_rtc_task_trigger(p_instance->p_reg, NRF_RTC_TASK_STOP);
    nrf_rtc_event_disable(p_instance->p_reg, mask);
    nrf_rtc_int_disable(p_instance->p_reg, mask);

    m_cb[p_instance->instance_id].state = NRF_DRV_STATE_UNINITIALIZED;
    NRF_LOG_INFO("Uninitialized.\r\n");
}

void nrf_drv_rtc_enable(nrf_drv_rtc_t const * const p_instance)
{
    ASSERT(m_cb[p_instance->instance_id].state == NRF_DRV_STATE_INITIALIZED);

    nrf_rtc_task_trigger(p_instance->p_reg, NRF_RTC_TASK_START);
    m_cb[p_instance->instance_id].state = NRF_DRV_STATE_POWERED_ON;
    NRF_LOG_INFO("Enabled.\r\n");
}

void nrf_drv_rtc_disable(nrf_drv_rtc_t const * const p_instance)
{
    ASSERT(m_cb[p_instance->instance_id].state != NRF_DRV_STATE_UNINITIALIZED);

    nrf_rtc_task_trigger(p_instance->p_reg, NRF_RTC_TASK_STOP);
    m_cb[p_instance->instance_id].state = NRF_DRV_STATE_INITIALIZED;
    NRF_LOG_INFO("Disabled.\r\n");
}

ret_code_t nrf_drv_rtc_cc_disable(nrf_drv_rtc_t const * const p_instance, uint32_t channel)
{
    ASSERT(m_cb[p_instance->instance_id].state != NRF_DRV_STATE_UNINITIALIZED);
    ASSERT(channel<p_instance->cc_channel_count);

    ret_code_t err_code;
    uint32_t int_mask = RTC_CHANNEL_INT_MASK(channel);
    nrf_rtc_event_t event    = RTC_CHANNEL_EVENT_ADDR(channel);

    nrf_rtc_event_disable(p_instance->p_reg,int_mask);
    if (nrf_rtc_int_is_enabled(p_instance->p_reg,int_mask))
    {
        nrf_rtc_int_disable(p_instance->p_reg,int_mask);
        if (nrf_rtc_event_pending(p_instance->p_reg,event))
        {
            nrf_rtc_event_clear(p_instance->p_reg,event);
            err_code = NRF_ERROR_TIMEOUT;
            NRF_LOG_WARNING("Function: %s, error code: %s.\r\n", (uint32_t)__func__, (uint32_t)ERR_TO_STR(err_code));
            return err_code;
        }
    }
    NRF_LOG_INFO("RTC id: %d, channel disabled: %d.\r\n", p_instance->instance_id, channel);
    err_code = NRF_SUCCESS;
    NRF_LOG_INFO("Function: %s, error code: %s.\r\n", (uint32_t)__func__, (uint32_t)ERR_TO_STR(err_code));
    return err_code;
}

ret_code_t nrf_drv_rtc_cc_set(nrf_drv_rtc_t const * const p_instance,
                              uint32_t channel,
                              uint32_t val,
                              bool enable_irq)
{
    ASSERT(m_cb[p_instance->instance_id].state != NRF_DRV_STATE_UNINITIALIZED);
    ASSERT(channel<p_instance->cc_channel_count);

    ret_code_t err_code;
    uint32_t int_mask = RTC_CHANNEL_INT_MASK(channel);
    nrf_rtc_event_t event    = RTC_CHANNEL_EVENT_ADDR(channel);

    nrf_rtc_event_disable(p_instance->p_reg, int_mask);
    nrf_rtc_int_disable(p_instance->p_reg, int_mask);

    val = RTC_WRAP(val);
    if (m_cb[p_instance->instance_id].reliable)
    {
        nrf_rtc_cc_set(p_instance->p_reg,channel,val);
        uint32_t cnt = nrf_rtc_counter_get(p_instance->p_reg);
        int32_t diff = cnt - val;
        if (cnt < val)
        {
            diff += RTC_COUNTER_COUNTER_Msk;
        }
        if (diff < m_cb[p_instance->instance_id].tick_latency)
        {
            err_code = NRF_ERROR_TIMEOUT;
            NRF_LOG_WARNING("Function: %s, error code: %s.\r\n", (uint32_t)__func__, (uint32_t)ERR_TO_STR(err_code));
            return err_code;
        }
    }
    else
    {
        nrf_rtc_cc_set(p_instance->p_reg,channel,val);
    }

    if (enable_irq)
    {
        nrf_rtc_event_clear(p_instance->p_reg,event);
        nrf_rtc_int_enable(p_instance->p_reg, int_mask);
    }
    nrf_rtc_event_enable(p_instance->p_reg,int_mask);

    NRF_LOG_INFO("RTC id: %d, channel enabled: %d, compare value: %d.\r\n", p_instance->instance_id, channel, val);
    err_code = NRF_SUCCESS;
    NRF_LOG_INFO("Function: %s, error code: %s.\r\n", (uint32_t)__func__, (uint32_t)ERR_TO_STR(err_code));
    return err_code;
}

void nrf_drv_rtc_tick_enable(nrf_drv_rtc_t const * const p_instance, bool enable_irq)
{
    nrf_rtc_event_t event = NRF_RTC_EVENT_TICK;
    uint32_t mask = NRF_RTC_INT_TICK_MASK;

    nrf_rtc_event_clear(p_instance->p_reg, event);
    nrf_rtc_event_enable(p_instance->p_reg, mask);
    if (enable_irq)
    {
        nrf_rtc_int_enable(p_instance->p_reg, mask);
    }
    NRF_LOG_INFO("Tick events enabled.\r\n");
}

void nrf_drv_rtc_tick_disable(nrf_drv_rtc_t const * const p_instance)
{
    uint32_t mask = NRF_RTC_INT_TICK_MASK;

    nrf_rtc_event_disable(p_instance->p_reg, mask);
    nrf_rtc_int_disable(p_instance->p_reg, mask);
    NRF_LOG_INFO("Tick events disabled.\r\n");
}

void nrf_drv_rtc_overflow_enable(nrf_drv_rtc_t const * const p_instance, bool enable_irq)
{
    nrf_rtc_event_t event = NRF_RTC_EVENT_OVERFLOW;
    uint32_t mask = NRF_RTC_INT_OVERFLOW_MASK;

    nrf_rtc_event_clear(p_instance->p_reg, event);
    nrf_rtc_event_enable(p_instance->p_reg, mask);
    if (enable_irq)
    {
        nrf_rtc_int_enable(p_instance->p_reg, mask);
    }
}
void nrf_drv_rtc_overflow_disable(nrf_drv_rtc_t const * const p_instance)
{
    uint32_t mask = NRF_RTC_INT_OVERFLOW_MASK;
    nrf_rtc_event_disable(p_instance->p_reg, mask);
    nrf_rtc_int_disable(p_instance->p_reg, mask);
}

uint32_t nrf_drv_rtc_max_ticks_get(nrf_drv_rtc_t const * const p_instance)
{
    uint32_t ticks;
    if (m_cb[p_instance->instance_id].reliable)
    {
        ticks = RTC_COUNTER_COUNTER_Msk - m_cb[p_instance->instance_id].tick_latency;
    }
    else
    {
        ticks = RTC_COUNTER_COUNTER_Msk;
    }
    return ticks;
}

/**@brief Generic function for handling RTC interrupt
 *
 * @param[in]  p_reg         Pointer to instance register structure.
 * @param[in]  instance_id   Index of instance.
 */
__STATIC_INLINE void nrf_drv_rtc_int_handler(NRF_RTC_Type * p_reg,
                                             uint32_t instance_id,
                                             uint32_t channel_count)
{
    uint32_t i;
    uint32_t int_mask = (uint32_t)NRF_RTC_INT_COMPARE0_MASK;
    nrf_rtc_event_t event = NRF_RTC_EVENT_COMPARE_0;

    for (i = 0; i < channel_count; i++)
    {
        if (nrf_rtc_int_is_enabled(p_reg,int_mask) && nrf_rtc_event_pending(p_reg,event))
        {
            nrf_rtc_event_disable(p_reg,int_mask);
            nrf_rtc_int_disable(p_reg,int_mask);
            nrf_rtc_event_clear(p_reg,event);
            NRF_LOG_DEBUG("Event: %s, instance id: %d.\r\n",
                         (uint32_t)EVT_TO_STR(event), (uint32_t)instance_id);
            m_handlers[instance_id]((nrf_drv_rtc_int_type_t)i);
        }
        int_mask <<= 1;
        event    = (nrf_rtc_event_t)((uint32_t)event + sizeof(uint32_t));
    }
    event = NRF_RTC_EVENT_TICK;
    if (nrf_rtc_int_is_enabled(p_reg,NRF_RTC_INT_TICK_MASK) &&
        nrf_rtc_event_pending(p_reg, event))
    {
        nrf_rtc_event_clear(p_reg, event);
        NRF_LOG_DEBUG("Event: %s, instance id: %d.\r\n", (uint32_t)EVT_TO_STR(event), instance_id);
        m_handlers[instance_id](NRF_DRV_RTC_INT_TICK);
    }

    event = NRF_RTC_EVENT_OVERFLOW;
    if (nrf_rtc_int_is_enabled(p_reg,NRF_RTC_INT_OVERFLOW_MASK) &&
        nrf_rtc_event_pending(p_reg, event))
    {
        nrf_rtc_event_clear(p_reg,event);
        NRF_LOG_DEBUG("Event: %s, instance id: %d.\r\n", (uint32_t)EVT_TO_STR(event), instance_id);
        m_handlers[instance_id](NRF_DRV_RTC_INT_OVERFLOW);
    }
}

#if NRF_MODULE_ENABLED(RTC0)
void RTC0_IRQHandler(void)
{
    nrf_drv_rtc_int_handler(NRF_RTC0,RTC0_INSTANCE_INDEX, NRF_RTC_CC_CHANNEL_COUNT(0));
}
#endif

#if NRF_MODULE_ENABLED(RTC1)
void RTC1_IRQHandler(void)
{
    nrf_drv_rtc_int_handler(NRF_RTC1,RTC1_INSTANCE_INDEX, NRF_RTC_CC_CHANNEL_COUNT(1));
}
#endif

#if NRF_MODULE_ENABLED(RTC2)
void RTC2_IRQHandler(void)
{
    nrf_drv_rtc_int_handler(NRF_RTC2,RTC2_INSTANCE_INDEX, NRF_RTC_CC_CHANNEL_COUNT(2));
}
#endif
#endif //ENABLED_RTC_COUNT
#endif //NRF_MODULE_ENABLED(RTC)

[L.B.]

Yes, correct! Add those sources to your project and build them. Note that you should edit the nrf_drv_config.h first, to enable the RTC module (otherwise the part #if NRF_MODULE_ENABLED(RTC1) won't compile).