We are running an NRF52840 on our custom board and getting around 450 uA while is BLE Advertising with a period of about 1 second.
If we disable BLE then our current consumption drops to 45 uA.
We would like to get current consumption down to 100 uA with BLE Advertising - is this possible?
Setup
- Freertos
- Tickless idle mode (using the nrf52 cmsis port code provided by nordic)
- 17.1 SDK
- NRF_LOGS is disabled
- no other peripherals running (QSPI is off ...etc)
Any suggestions on how to reduce current consumption while BLE is advertising?
We don't want to use the SYSTEM OFF low power mode since we will eventually need other parts of our system to be active and not require a reset.
Here is a sample of the ble advertisement init code I'm running
static void advertising_init(void)
{
uint32_t err_code;
ble_advertising_init_t init;
// Service UUID list for advertising.
ble_uuid_t m_adv_uuids[] =
{
{BLE_UUID_DATA_SERVICE, m_dcs.uuid_type}
};
std::memset(&init, 0, sizeof(init));
// Fill main advertising data packet with complete data service UUID
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.advdata.flags = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE;
// Begin filling scan response packet with advertising name and flags
init.srdata.name_type = BLE_ADVDATA_FULL_NAME;
init.srdata.include_appearance = false;
// Create variables for advertising service data
ble_advdata_service_data_t service_data;
uint8_array_t data_array;
// Point at the data, add service data UUID
data_array.p_data = (uint8_t*)blem_get_serial_number();
data_array.size = blem_get_serial_number_bytes();
service_data.service_uuid = 0x180A;
service_data.data = data_array;
// Add service data structure to init
init.srdata.p_service_data_array = &service_data;
init.srdata.service_data_count = 1;
init.config.ble_adv_whitelist_enabled = false;
init.config.ble_adv_directed_high_duty_enabled = false;
init.config.ble_adv_directed_enabled = false;
init.config.ble_adv_directed_interval = 0;
init.config.ble_adv_directed_timeout = 0;
init.config.ble_adv_fast_enabled = true;
init.config.ble_adv_fast_interval = APP_ADV_FAST_INTERVAL_UNITS; // 25 ms
init.config.ble_adv_fast_timeout = APP_ADV_FAST_DURATION_UNITS; // 30 seconds
init.config.ble_adv_slow_enabled = true;
init.config.ble_adv_slow_interval = APP_ADV_SLOW_INTERVAL_UNITS; // 1022 ms
init.config.ble_adv_slow_timeout = APP_ADV_SLOW_DURATION_UNITS; // 0 (run forever)
init.evt_handler = on_adv_evt;
err_code = ble_advertising_init(&m_advertising, &init);
APP_ERROR_CHECK(err_code);
ble_advertising_conn_cfg_tag_set(&m_advertising, APP_BLE_CONN_CFG_TAG);
}
