how to wake up the device by using threshold

RE: how to wake up the device by using threshold

ps_anu — Thu, 21 Mar 2019 16:42:26 GMT

One more,, i tried to advertise when i need to send data using fimer . I have tried alot after advertising , data is not transfering i am getting fatal error why ? I need to advdrtise only when i need then send the data and disconnect . flow like check the threshold using timer ----advertise start -----if connected-----send the data ----and then disconnect .. i am achieving upto connected state after that i am getting fatal error . How to solve ? Is this possible?

RE: how to wake up the device by using threshold

ps_anu — Thu, 21 Mar 2019 16:30:07 GMT

How to do that can you explain me

RE: how to wake up the device by using threshold

Stian Røed Hafskjold — Thu, 21 Mar 2019 13:48:16 GMT

Not sure what "led pin" is, but yes you can wake the chip up from system OFF using a GPIO pin interrupt signal from the temperature sensor.

RE: how to wake up the device by using threshold

ps_anu — Thu, 21 Mar 2019 10:47:41 GMT

led pin to wake up the device from system off mode ..as per option 1

RE: how to wake up the device by using threshold

Stian Røed Hafskjold — Thu, 21 Mar 2019 10:46:15 GMT

Using LED pin for what?

RE: how to wake up the device by using threshold

Stian Røed Hafskjold — Thu, 21 Mar 2019 10:44:08 GMT

Ok, so I think you are finished with you code now. It goes to sleep in the idle_state_handle() and wake up using app_timer interrupt.

RE: how to wake up the device by using threshold

ps_anu — Thu, 21 Mar 2019 02:46:42 GMT

Is it possible for option 1 . if manually i am setting threshold in my program , and by using led pin

RE: how to wake up the device by using threshold

ps_anu — Wed, 20 Mar 2019 19:02:43 GMT

In time event handler i am comparing threshold

RE: how to wake up the device by using threshold

ps_anu — Wed, 20 Mar 2019 18:57:28 GMT

 */
int main(void)
{
bool erase_bonds;



    // Initialize.
   
    uart_init();
    log_init();
    timers_init();

    ret_code_t err_code =app_timer_create(&m_led_a_timer_id,   APP_TIMER_MODE_REPEATED   ,timer_sensor_event_handler);
APP_ERROR_CHECK(err_code);

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

  printf("\r\nUART started.\r\n");
    NRF_LOG_INFO("Debug logging for UART over RTT started.");

    advertising_start();

    err_code = app_timer_start(m_led_a_timer_id,APP_TIMER_TICKS(60000),NULL);
  APP_ERROR_CHECK(err_code);
 


     

twi_init();
 MAX30_set_mode();
    // Start execution.


   

        

      for(;;)
             {
idle_state_handle();

      
      }
      }

RE: how to wake up the device by using threshold

Stian Røed Hafskjold — Wed, 20 Mar 2019 15:34:43 GMT

If you are successful in checking the threshold using timer, there's not really much more to do. The CPU automatically goes to IDLE between the interrupts, as long as there is a __WFE() in the main loop somewhere. Can you post your main function, then I can have a look.

RE: how to wake up the device by using threshold

ps_anu — Wed, 20 Mar 2019 13:09:12 GMT

Thank you sitan . option 2 is good , i can go with this , actually i tried using timer to interrupt the sleep but i couldn't reach . i don't how to write the flow to interrupt the sleep using timer .. i have succeed upto checking the threshold using timer .can you help me

RE: how to wake up the device by using threshold

Stian Røed Hafskjold — Wed, 20 Mar 2019 12:04:04 GMT

ok, so in order to do a comparison in software like you described you need the CPU to be running. Software is running on the CPU. If the CPU is running the chip is by definition not in sleep mode. If you are checking a temperature value in software the chip is already running.

If you want the chip to sleep and wake up when the sensor reaches a certain temperature level, you have two choices, depending on what type of sensor you have:

1. Either the temperature sensor itself can be programmed with a threshold-value and it can wake the chip up by asserting a GPIO pin on the chip. This method can wake the chip up either from system OFF mode or system ON mode.

2. Or, the temperature sensor needs to be periodically polled, and you can check the threshold value in code. This method requires the RTC clock to be running, and the RTC clock will wake the chip up from system ON mode, create an interrupt, and the interrupt will be handled in software. Like this: if(m_sample > threshold). and then go back to sleep

RE: how to wake up the device by using threshold

ps_anu — Wed, 20 Mar 2019 11:39:40 GMT

threshold mean here i am using temperature sensor , so i am setting the threshold value (manually) and comparing with temperature value . like this

if(m_sample > threshold)

RE: how to wake up the device by using threshold

Stian Røed Hafskjold — Wed, 20 Mar 2019 08:47:29 GMT

1. Please explain what you mean with "threshold value".

2. Please read the links I posted in my previous answer and see if this is useful to you.

RE: how to wake up the device by using threshold

ps_anu — Tue, 19 Mar 2019 17:33:54 GMT

Can we wake up by using threshold value

RE: how to wake up the device by using threshold

Stian Røed Hafskjold — Tue, 19 Mar 2019 14:53:24 GMT

In system OFF the chip can wake up by the ANADETECT signal, created by the LPCOMP peripheral: http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/power.html?cp=2_1_0_17_1#unique_1707892264

And from the LPCOMP peripheral:

The LPCOMP can wake up the system from System OFF by asserting the ANADETECT signal. The ANADETECT signal can be derived from any of the event sources that generate the UP, DOWN and CROSS events. In case of wakeup from System OFF, no events will be generated, only the ANADETECT signal. See the ANADETECT register (ANADETECT) for more information on how to configure the ANADETECT signal.

http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/lpcomp.html?cp=2_1_0_38#concept_tdv_zkx_lr

And here is an example in the SDK demonstrating the use of LPCOMP: http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.2.0/lpcomp_example.html?cp=4_0_0_4_5_17