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Question about current in low power mode.

Hi
softdevice uses s130
The board is using nrf51 dk. The example uses the ble_app_beacon example from sdk12.3.
   if (switch_hit ())
         {
           // NRF_POWER-> SYSTEMOFF = 1;
         // sd_power_system_off ();
          
         sd_ble_gap_adv_stop ();
          power_manage ();
     
         }
I measured the current by adding this part. I normally use 4.5mA, and when I enter the low power mode, it consumes 0.9mA. I thought I would spend much lower. Is this correct? Or am I making a mistake?

For reference, when I tested with system_on_wakeup_on_gpio example in GITHUB, I consumed 20uA when entering sleep mode.
I need your help.
  • Show us more code. Some peripherials will keep HFCLK or HFINT running - this includes the debugger.

  • @Paek: Also please make sure you do a power reset before you do measurement, this is due to the NRF51 staying in debug mode after programming and will draw more current. 

  • #include <stdbool.h>
    #include <stdint.h>
    #include "ble_advdata.h"
    #include "nordic_common.h"
    #include "softdevice_handler.h"
    #include "bsp.h"
    #include "app_timer.h"
    #include "nrf_log.h"
    #include "nrf_log_ctrl.h"
    #include "nrf_drv_gpiote.h"


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

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

    #define APP_CFG_NON_CONN_ADV_TIMEOUT 0 /**< Time for which the device must be advertising in non-connectable mode (in seconds). 0 disables timeout. */
    #define NON_CONNECTABLE_ADV_INTERVAL MSEC_TO_UNITS(100, UNIT_0_625_MS) /**< The advertising interval for non-connectable advertisement (100 ms). This value can vary between 100ms to 10.24s). */

    #define APP_BEACON_INFO_LENGTH 0x17 /**< Total length of information advertised by the Beacon. */
    #define APP_ADV_DATA_LENGTH 0x15 /**< Length of manufacturer specific data in the advertisement. */
    #define APP_DEVICE_TYPE 0x02 /**< 0x02 refers to Beacon. */
    #define APP_MEASURED_RSSI 0xC3 /**< The Beacon's measured RSSI at 1 meter distance in dBm. */
    #define APP_COMPANY_IDENTIFIER 0x0059 /**< Company identifier for Nordic Semiconductor ASA. as per www.bluetooth.org. */
    #define APP_MAJOR_VALUE 0x01, 0x02 /**< Major value used to identify Beacons. */
    #define APP_MINOR_VALUE 0x03, 0x04 /**< Minor value used to identify Beacons. */
    #define APP_BEACON_UUID 0x01, 0x12, 0x23, 0x34, \
    0x45, 0x56, 0x67, 0x78, \
    0x89, 0x9a, 0xab, 0xbc, \
    0xcd, 0xde, 0xef, 0xf0 /**< Proprietary UUID for Beacon. */

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

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

    #if defined(USE_UICR_FOR_MAJ_MIN_VALUES)
    #define MAJ_VAL_OFFSET_IN_BEACON_INFO 18 /**< Position of the MSB of the Major Value in m_beacon_info array. */
    #define UICR_ADDRESS 0x10001080 /**< Address of the UICR register used by this example. The major and minor versions to be encoded into the advertising data will be picked up from this location. */
    #endif

    static ble_gap_adv_params_t m_adv_params; /**< Parameters to be passed to the stack when starting advertising. */
    static uint8_t m_beacon_info[APP_BEACON_INFO_LENGTH] = /**< Information advertised by the Beacon. */
    {
    APP_DEVICE_TYPE, // Manufacturer specific information. Specifies the device type in this
    // implementation.
    APP_ADV_DATA_LENGTH, // Manufacturer specific information. Specifies the length of the
    // manufacturer specific data in this implementation.
    APP_BEACON_UUID, // 128 bit UUID value.
    APP_MAJOR_VALUE, // Major arbitrary value that can be used to distinguish between Beacons.
    APP_MINOR_VALUE, // Minor arbitrary value that can be used to distinguish between Beacons.
    APP_MEASURED_RSSI // Manufacturer specific information. The Beacon's measured TX power in
    // this implementation.
    };

    /**@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 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)
    {
    uint32_t err_code;
    ble_advdata_t advdata;
    uint8_t flags = BLE_GAP_ADV_FLAG_BR_EDR_NOT_SUPPORTED;

    ble_advdata_manuf_data_t manuf_specific_data;

    manuf_specific_data.company_identifier = APP_COMPANY_IDENTIFIER;

    #if defined(USE_UICR_FOR_MAJ_MIN_VALUES)
    // If USE_UICR_FOR_MAJ_MIN_VALUES is defined, the major and minor values will be read from the
    // UICR instead of using the default values. The major and minor values obtained from the UICR
    // are encoded into advertising data in big endian order (MSB First).
    // To set the UICR used by this example to a desired value, write to the address 0x10001080
    // using the nrfjprog tool. The command to be used is as follows.
    // nrfjprog --snr <Segger-chip-Serial-Number> --memwr 0x10001080 --val <your major/minor value>
    // For example, for a major value and minor value of 0xabcd and 0x0102 respectively, the
    // the following command should be used.
    // nrfjprog --snr <Segger-chip-Serial-Number> --memwr 0x10001080 --val 0xabcd0102
    uint16_t major_value = ((*(uint32_t *)UICR_ADDRESS) & 0xFFFF0000) >> 16;
    uint16_t minor_value = ((*(uint32_t *)UICR_ADDRESS) & 0x0000FFFF);

    uint8_t index = MAJ_VAL_OFFSET_IN_BEACON_INFO;

    m_beacon_info[index++] = MSB_16(major_value);
    m_beacon_info[index++] = LSB_16(major_value);

    m_beacon_info[index++] = MSB_16(minor_value);
    m_beacon_info[index++] = LSB_16(minor_value);
    #endif

    manuf_specific_data.data.p_data = (uint8_t *) m_beacon_info;
    manuf_specific_data.data.size = APP_BEACON_INFO_LENGTH;

    // Build and set advertising data.
    memset(&advdata, 0, sizeof(advdata));

    advdata.name_type = BLE_ADVDATA_NO_NAME;
    advdata.flags = flags;
    advdata.p_manuf_specific_data = &manuf_specific_data;

    err_code = ble_advdata_set(&advdata, NULL);
    APP_ERROR_CHECK(err_code);

    // Initialize advertising parameters (used when starting advertising).
    memset(&m_adv_params, 0, sizeof(m_adv_params));

    m_adv_params.type = BLE_GAP_ADV_TYPE_ADV_NONCONN_IND;
    m_adv_params.p_peer_addr = NULL; // Undirected advertisement.
    m_adv_params.fp = BLE_GAP_ADV_FP_ANY;
    m_adv_params.interval = NON_CONNECTABLE_ADV_INTERVAL;
    m_adv_params.timeout = APP_CFG_NON_CONN_ADV_TIMEOUT;
    }


    /**@brief Function for starting advertising.
    */
    static void advertising_start(void)
    {
    uint32_t err_code;

    err_code = sd_ble_gap_adv_start(&m_adv_params);
    APP_ERROR_CHECK(err_code);

    err_code = bsp_indication_set(BSP_INDICATE_ADVERTISING);
    APP_ERROR_CHECK(err_code);
    }


    /**@brief Function for initializing the BLE stack.
    *
    * @details 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 the SoftDevice handler module.
    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.
    err_code = softdevice_enable(&ble_enable_params);
    APP_ERROR_CHECK(err_code);
    }


    /**@brief Function for doing power management.
    */
    static void power_manage(void)
    {

    uint32_t err_code = sd_app_evt_wait();
    APP_ERROR_CHECK(err_code);

    }

    void in_pin_handler(nrf_drv_gpiote_pin_t pin, nrf_gpiote_polarity_t action)
    {
    //nrf_drv_gpiote_out_toggle(21);
    nrf_gpio_pin_toggle(24);
    advertising_start();
    }


    static void gpio_init(void)
    {
    nrf_gpio_cfg_input(17,NRF_GPIO_PIN_PULLUP);
    nrf_gpio_cfg_input(19,NRF_GPIO_PIN_PULLUP);
    nrf_gpio_cfg_output(24);

    ret_code_t err_code;

    err_code = nrf_drv_gpiote_init();
    APP_ERROR_CHECK(err_code);

    nrf_drv_gpiote_in_config_t in_config = GPIOTE_CONFIG_IN_SENSE_HITOLO(true);
    in_config.pull = NRF_GPIO_PIN_PULLUP;

    err_code = nrf_drv_gpiote_in_init(18, &in_config, in_pin_handler);
    APP_ERROR_CHECK(err_code);

    nrf_drv_gpiote_in_event_enable(18, true);

    }
    uint8_t switch_hit(void)
    {
    static uint8_t prev_state = 1;
    uint8_t cur_state;

    // cur_state = nrf_gpio_pin_read(17);
    cur_state = nrf_gpio_pin_read(17);
    if(prev_state != cur_state)
    {
    prev_state = cur_state;
    if(!cur_state)
    return 1;
    else
    return 0;
    }
    else
    return 0;
    }
    uint8_t switch_hit1(void)
    {
    static uint8_t prev_state = 1;
    uint8_t cur_state;

    // cur_state = nrf_gpio_pin_read(17);
    cur_state = nrf_gpio_pin_read(19);
    if(prev_state != cur_state)
    {
    prev_state = cur_state;
    if(!cur_state)
    return 1;
    else
    return 0;
    }
    else
    return 0;
    }

    /**
    * @brief Function for application main entry.
    */
    int main(void)
    {
    uint32_t err_code;
    // Initialize.
    err_code = NRF_LOG_INIT(NULL);
    APP_ERROR_CHECK(err_code);

    APP_TIMER_INIT(APP_TIMER_PRESCALER, APP_TIMER_OP_QUEUE_SIZE, false);
    // err_code = bsp_init(BSP_INIT_LED, APP_TIMER_TICKS(100, APP_TIMER_PRESCALER), NULL);
    // APP_ERROR_CHECK(err_code);
    ble_stack_init();
    advertising_init();

    // Start execution.
    NRF_LOG_INFO("BLE Beacon started\r\n");
    gpio_init();
    advertising_start();
    err_code = sd_power_dcdc_mode_set(NRF_POWER_DCDC_ENABLE);
    APP_ERROR_CHECK(err_code);
    err_code = sd_power_mode_set(NRF_POWER_MODE_LOWPWR);
    APP_ERROR_CHECK(err_code);
    // Enter main loop.
    for (;; )
    {
    //power_manage();
    if (NRF_LOG_PROCESS() == false)
    {
    //power_manage();
    }
    if(switch_hit())
    {
    //NRF_POWER->SYSTEMOFF = 1;
    // sd_power_system_off();



    sd_ble_gap_adv_stop();
    power_manage();

    }
    if(switch_hit1())
    {
    nrf_gpio_pin_toggle(24);
    }

    }
    }


    /**
    * @}
    */

    I added gpio related code to the beacon example
  • If it is a power reset, do you mean to just turn it off and on?
  • If you are using GPIOTE IN interrupt, the current consumption will be around 1mA as the function require the HFCLK. If you want lower power , please use GPIOTE PORT interrupt instead. 

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