nrf51 system off /on after specific duration of time for ble central

[MORagab]

hello , i am trying to imblement system off or system on  in one of the ble central example 'ble_app_blinky_c' , i tried to refer to this example 'ble_app_template' but if i understand the code correctly it seems like it utilize all the bsp buttons , also i want to add a timer where the nrf51 goes into system off after let`s say 5 mins 

thank you 

[Vidar Berg]

Hello,

The BSP module is not required for configuring the GPIOs, you can access the GPIOs directly as well (GPIO abstraction).

e.g., 

void enter_sys_off()
{
    /*Pins that are not needed in system OFF should be configured to reset state
    to avoid leakage currents and unexpected wakeups.*/
    nrf_gpio_cfg_default(PIN_x);
    nrf_gpio_cfg_default(PIN_y);
    ...
        
    /* Configure wakeup pin*/
    nrf_gpio_cfg_sense_input(WAKE_UP_PIN,
                             NRF_GPIO_PIN_x, // configure pull-up or pull-down according to button schematic.
                             NRF_GPIO_PIN_SENSE_x); // Active low or active high
    sd_power_system_off(); // NOTE: chip will enter emulated system OFF if chip is in debug interface mode. 
}

"enter_sys_off()" can be called from your timer interrupt. Alternatively, set the scanner timeout to 5 minutes, and enter system off when scanner timeout occurs: 

    #define SCAN_TIMEOUT    5*60  //Scanner timeout in seconds
    
    static void on_ble_evt(const ble_evt_t * const p_ble_evt)
    {
        ..
        
        switch (p_ble_evt->header.evt_id)
        {
            case BLE_GAP_EVT_TIMEOUT:
            if (p_ble_evt->evt.gap_evt.params.timeout.src != BLE_GAP_TIMEOUT_SRC_SCAN)
            {
                enter_sys_off();
            }
        }
        
        ..

 

[MORagab]

thank you very much for your help