Reduce power consumption

RE: Reduce power consumption

Jared — Thu, 11 Aug 2022 09:22:19 GMT

Hi,

Yes, please do 🙂

regards

Jared

RE: Reduce power consumption

sasci — Thu, 11 Aug 2022 08:48:52 GMT

Hello again. Thank you for your help. I have an idea. When my device is in deep sleep, I want to wake it up with a timer. I think I need to add a new ticket :)

RE: Reduce power consumption

Jared — Thu, 04 Aug 2022 10:54:21 GMT

Hi,

[quote user="sasci"]Logger module was turned off. Then, the consumption has decreased like about 600uA. Now the consumption is around 190-200uA. [/quote]

Good

Yes it's suitable for SDK v15.2.0. Here is the same project but for SDK v15.x.x.x

regards

Jared

RE: Reduce power consumption

sasci — Thu, 04 Aug 2022 10:34:13 GMT

Logger module was turned off. Then, the consumption has decreased like about 600uA. Now the consumption is around 190-200uA. But I didn't try second step. Is second step suitable for SDK 15.2.0? As far as I see it works in SDK17.0.2. Is there a another example for SDK 15.2.0? Because my code SDK version is SDK 15.2.0

RE: Reduce power consumption

Jared — Wed, 03 Aug 2022 12:48:30 GMT

Hi,

There are a couple of steps that you can implement to do decrease the power consumption:

You can turn off the logger module. Disable logging in the sdk_config.h file
Use RTC + PPI to enable the EasyDMA only during sampling. See this example.

regards

Jared

RE: Reduce power consumption

sasci — Wed, 03 Aug 2022 08:16:35 GMT

My code is here.

#include <stdbool.h>
#include <stdint.h>
#include "nordic_common.h"
#include "bsp.h"
#include "nrf_soc.h"
#include "nrf_sdh.h"
#include "nrf_sdh_ble.h"
#include "ble_advdata.h"
#include "app_timer.h"
#include "nrf_pwr_mgmt.h"

#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"

#include "nrf_drv_saadc.h"

#define APP_BLE_CONN_CFG_TAG            1                                  /**< A tag identifying the SoftDevice BLE configuration. */

#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 ADC_REF_VOLTAGE_IN_MILLIVOLTS   600                               /**< Reference voltage (in milli volts) used by ADC while doing conversion. */
#define ADC_PRE_SCALING_COMPENSATION    6                                 /**< The ADC is configured to use VDD with 1/3 prescaling as input. And hence the result of conversion is to be multiplied by 3 to get the actual value of the battery voltage.*/
#define DIODE_FWD_VOLT_DROP_MILLIVOLTS  270                               /**< Typical forward voltage drop of the diode . */
#define ADC_RES_10BIT                   1024                              /**< Maximum digital value for 10-bit ADC conversion. */

#define DEAD_BEEF                       0xDEADBEEF                         /**< Value used as error code on stack dump, can be used to identify stack location on stack unwind. */
#define ADC_RESULT_IN_MILLI_VOLTS(ADC_VALUE)\
        ((((ADC_VALUE) * ADC_REF_VOLTAGE_IN_MILLIVOLTS) / ADC_RES_10BIT) * ADC_PRE_SCALING_COMPENSATION)

#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

#define ADV_UPDATE_INTERVAL             APP_TIMER_TICKS(5000)  //5000 

static ble_gap_adv_params_t m_adv_params;                                                     /**< Parameters to be passed to the stack when starting advertising. */
static uint8_t              m_adv_handle = BLE_GAP_ADV_SET_HANDLE_NOT_SET;                    /**< Advertising handle used to identify an advertising set. */
static uint8_t              m_enc_advdata[BLE_GAP_ADV_SET_DATA_SIZE_EXTENDED_MAX_SUPPORTED];  /**< Buffer for storing an encoded advertising set. */
static nrf_saadc_value_t m_adc_buf;
static uint16_t batt_lvl_in_milli_volts;
static uint8_t percentage_batt_lvl;

APP_TIMER_DEF(m_adv_phy_update_timer_id); 

/**@brief Struct that contains pointers to the encoded advertising data. */
static ble_gap_adv_data_t m_adv_data =
{
    .adv_data =
    {
        .p_data = m_enc_advdata,
        .len    = BLE_GAP_ADV_SET_DATA_SIZE_EXTENDED_MAX_SUPPORTED
    },
    .scan_rsp_data =
    {
        .p_data = NULL,
        .len    = 0

    }
};


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);
}
static uint16_t saadc_event_handler(nrf_drv_saadc_evt_t const * p_event)
{
    if (p_event->type == NRF_DRV_SAADC_EVT_DONE)
    //if(true)
    {
        nrf_saadc_value_t adc_result;
        uint32_t err_code;

        adc_result = p_event->data.done.p_buffer[0];

        batt_lvl_in_milli_volts =
            ADC_RESULT_IN_MILLI_VOLTS(adc_result) + DIODE_FWD_VOLT_DROP_MILLIVOLTS;
        
        percentage_batt_lvl = battery_level_in_percent(batt_lvl_in_milli_volts);

        //NRF_LOG_INFO("Battery Level : %d [mV]", batt_lvl_in_milli_volts);
        //NRF_LOG_INFO("Battery Percent : %d", percentage_batt_lvl);
        return (percentage_batt_lvl);
    }
    else if (p_event->type == NRF_DRV_SAADC_EVT_CALIBRATEDONE)
    {
        NRF_LOG_INFO("SAADC calibration complete");
    }
    return (batt_lvl_in_milli_volts);
}

static void battery_level_meas_timeout_handler(void * p_context)
{
    UNUSED_PARAMETER(p_context);
    
    ret_code_t err_code = nrf_drv_saadc_buffer_convert(&m_adc_buf, 1);
    APP_ERROR_CHECK(err_code);
    
    err_code = nrf_drv_saadc_sample();
    APP_ERROR_CHECK(err_code);
}
/**@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;

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

    m_adv_params.properties.type = BLE_GAP_ADV_TYPE_EXTENDED_NONCONNECTABLE_NONSCANNABLE_UNDIRECTED;
    m_adv_params.p_peer_addr     = NULL;    // Undirected advertisement.
    m_adv_params.filter_policy   = BLE_GAP_ADV_FP_ANY;
    m_adv_params.interval        = NON_CONNECTABLE_ADV_INTERVAL;
    m_adv_params.duration        = 0;       // Never time out.

    err_code = ble_advdata_encode(&advdata, m_adv_data.adv_data.p_data, &m_adv_data.adv_data.len);
    APP_ERROR_CHECK(err_code);

    err_code = sd_ble_gap_adv_set_configure(&m_adv_handle, &m_adv_data, &m_adv_params);
    APP_ERROR_CHECK(err_code);
    m_beacon_info[22] = percentage_batt_lvl;
    //NRF_LOG_INFO("battary_level %d",percentage_batt_lvl);
}


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

    err_code = sd_ble_gap_adv_start(m_adv_handle, APP_BLE_CONN_CFG_TAG);
    APP_ERROR_CHECK(err_code);

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

static void adv_phy_update_timeout_handler(void * p_context,const uint16_t batt_lvl_in_milli_volts)
{     
    ret_code_t err_code = nrf_drv_saadc_buffer_convert(&m_adc_buf, 1);
    APP_ERROR_CHECK(err_code);
    
    err_code = nrf_drv_saadc_sample();
    APP_ERROR_CHECK(err_code);
    static bool coded;

    coded = !coded;

    sd_ble_gap_adv_stop(0);

    if (coded == true)
    {
        m_adv_params.primary_phy   = BLE_GAP_PHY_CODED;
        m_adv_params.secondary_phy = BLE_GAP_PHY_CODED;
        NRF_LOG_INFO("Starting advertising with CODED PHY");
        // m_beacon_info[22] = percentage_batt_lvl;
        NRF_LOG_INFO("battary_level %d",m_beacon_info[22]);
    }
    else
    {   
        m_adv_params.primary_phy   = BLE_GAP_PHY_CODED;
        m_adv_params.secondary_phy = BLE_GAP_PHY_CODED;
        NRF_LOG_INFO("Starting advertising with 1M PHY");
    }

    advertising_init();
    advertising_start();
}


/**@brief Function for initializing the BLE stack.
 *
 * @details Initializes the SoftDevice and the BLE event interrupt.
 */
static void ble_stack_init(void)
{
    ret_code_t err_code;

    err_code = nrf_sdh_enable_request();
    APP_ERROR_CHECK(err_code);

    // Configure the BLE stack using the default settings.
    // Fetch the start address of the application RAM.
    uint32_t ram_start = 0;
    err_code = nrf_sdh_ble_default_cfg_set(APP_BLE_CONN_CFG_TAG, &ram_start);
    APP_ERROR_CHECK(err_code);

    // Enable BLE stack.
    err_code = nrf_sdh_ble_enable(&ram_start);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for initializing logging. */
static void log_init(void)
{
    ret_code_t err_code = NRF_LOG_INIT(NULL);
    APP_ERROR_CHECK(err_code);

    NRF_LOG_DEFAULT_BACKENDS_INIT();
}

/**@brief Function for initializing LEDs. */
static void leds_init(void)
{
    ret_code_t err_code = bsp_init(BSP_INIT_LEDS, NULL);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for initializing timers. */
static void timers_init(void)
{
    ret_code_t err_code = app_timer_init();
    APP_ERROR_CHECK(err_code);

    err_code = app_timer_create(&m_adv_phy_update_timer_id,
                                APP_TIMER_MODE_REPEATED,
                                adv_phy_update_timeout_handler);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for initializing power management.
 */
static void power_management_init(void)
{
    ret_code_t err_code;
    err_code = nrf_pwr_mgmt_init();
    APP_ERROR_CHECK(err_code);
}

static void adc_configure(void)
{   
    ret_code_t err_code = nrf_drv_saadc_init(NULL, saadc_event_handler);
    APP_ERROR_CHECK(err_code);
    nrf_saadc_channel_config_t config =
        NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(NRF_SAADC_INPUT_VDD);
    config.burst = NRF_SAADC_BURST_ENABLED;
    err_code = nrf_drv_saadc_channel_init(0, &config);
    APP_ERROR_CHECK(err_code);
    err_code = nrf_drv_saadc_calibrate_offset();
    APP_ERROR_CHECK(err_code);    
}

/**@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 application main entry.
 */
int main(void)
{
    // Initialize.
    log_init();
    timers_init();
    leds_init();
    power_management_init();
    ble_stack_init();
    adc_configure();
    (void)sd_power_dcdc_mode_set(NRF_POWER_DCDC_ENABLE);
    advertising_init();

    // Start execution.
    NRF_LOG_INFO("Beacon example started.");
    
    advertising_start();

    uint32_t err_code = app_timer_start(m_adv_phy_update_timer_id, APP_TIMER_TICKS(3000), NULL);//10000
    APP_ERROR_CHECK(err_code);

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

RE: Reduce power consumption

sasci — Wed, 03 Aug 2022 08:10:44 GMT

[quote userid="73165" url="~/f/nordic-q-a/90540/reduce-power-consumption/379556"]Are you using the module on a custom board or the evaluation kit for the module?[/quote]

Just using module and battery. This device is edge device. This device reading battery level and set phy beacon then advertising.

[quote userid="73165" url="~/f/nordic-q-a/90540/reduce-power-consumption/379556"]Ok, so I'm guessing the battery level is read by using the ADC? Can you share your code?[/quote]

Of course. It is possible

RE: Reduce power consumption

Jared — Mon, 01 Aug 2022 13:37:51 GMT

[quote user="sasci"]

There are battery level reading and phy beacon. but I don't know how to uninitialize before going to sleep.

[/quote]

Ok, so I'm guessing the battery level is read by using the ADC? Can you share your code?

[quote user="sasci"]I am using bt840F. [/quote]

Are you using the module on a custom board or the evaluation kit for the module?

regards

Jared

RE: Reduce power consumption

sasci — Mon, 01 Aug 2022 11:11:50 GMT

[quote userid="73165" url="~/f/nordic-q-a/90540/reduce-power-consumption/379487"]What peripherals you are using and if you un-initialize them before going to sleep.[/quote]

There are battery level reading and phy beacon. but I don't know how to uninitialize before going to sleep.

[quote userid="73165" url="~/f/nordic-q-a/90540/reduce-power-consumption/379487"]How do you measure the current? Are you using using the PPK, can you share a plot of the current?[/quote]

I don't use ppk. I am using multimeter instead of ppk.

[quote userid="73165" url="~/f/nordic-q-a/90540/reduce-power-consumption/379487"]Are you using a custom board or a development kit? Have you been able to reproduce this on a dev kit?[/quote]

I am using bt840F.

RE: Reduce power consumption

Jared — Mon, 01 Aug 2022 10:10:50 GMT

Hi,

Can you provide more information such as:

What peripherals you are using and if you un-initialize them before going to sleep.
How do you measure the current? Are you using using the PPK, can you share a plot of the current?
Are you using a custom board or a development kit? Have you been able to reproduce this on a dev kit?

regards
Jared