how to wake up from sleep mode

RE: how to wake up from sleep mode

Einar Thorsrud — Mon, 10 Dec 2018 08:06:33 GMT

Please refer to the documentation or tutorial. There are also a number of SDK examples that use the app timer, for instance <SDK>\examples\peripheral\csense_drv\main.c.

RE: how to wake up from sleep mode

ps_anu — Sat, 08 Dec 2018 10:41:14 GMT

where i should set the timer ? how to make it run continuously ?

is this right ?

uint32_t time_ms = 2000;

RE: how to wake up from sleep mode

Einar Thorsrud — Fri, 07 Dec 2018 11:27:21 GMT

A few posts were deleted by a mistake, but here are the answers:

1. The best and simplest way to verify that the device is in sleep is to measure current consumption (that is what you are after in the end anyway).

2. The nRF has to wake up to read the sensor. It cannot do that while it is sleeping. That is why I suggest you wake up to read the sensor using a app_timer.

RE: how to wake up from sleep mode

Einar Thorsrud — Fri, 07 Dec 2018 10:35:43 GMT

Yes, measuring current consumption is the simplest and best way.

RE: how to wake up from sleep mode

ps_anu — Fri, 07 Dec 2018 05:46:18 GMT

ok ... how you know that device in sleep mode ?

by measuring current or checking data

RE: how to wake up from sleep mode

Einar Thorsrud — Thu, 06 Dec 2018 14:01:29 GMT

I suggest you use the app_timer (timer library).

RE: how to wake up from sleep mode

ps_anu — Thu, 06 Dec 2018 12:03:01 GMT

how to wake up the nrf

RE: how to wake up from sleep mode

Einar Thorsrud — Thu, 06 Dec 2018 11:59:28 GMT

Looking at your code snippets I see there are a number of misunderstandings here:

You have to read data via TWI to see if the temperature has crossed the threshold. So clearly the nRF cannot wake on that event, as the only way it can know about it is to wake up regularly and read the sensor.
You do a busy wait in your main loop, which waits by spending CPU cycles. This means that your application will spend 5 seconds consuming a lot of power while doing nothing for every iteration of your main loop.
The sd_app_evt_wait() call should cause the CPU to sleep for a bit of time, but only until the TWI transaction has finished. All the rest of your waiting happens in the busy wait (sd_app_evt_wait()).

The proper way to do what you want is to have a main loop which does close to nothing other than calling sd_app_evt_wait(). Then you should use a low power timer (RTC), typically via the timer library to read the sensor at a regular interval.

RE: how to wake up from sleep mode

ps_anu — Thu, 06 Dec 2018 11:28:48 GMT

not using pin interrupt ... when my temperature goes beyond threshold it should wake up automatically

see the code here i didn't use sleep mode

static void threshold_value()

{
   
      m_xfer_done = false;
    uint16_t length1;
    uint16_t threshold;
 
    char str[80];
     threshold= 30;
 if (m_sample < threshold )

    {      
 
    length1 = sprintf(str,"%d", m_sample);
  nrf_drv_twi_rx(&m_twi, LM75B_ADDR, &m_sample, sizeof(m_sample));
     ble_nus_data_send(&m_nus,str,sizeof(m_sample), m_conn_handle);
      
  
}
}

RE: how to wake up from sleep mode

Einar Thorsrud — Thu, 06 Dec 2018 09:06:11 GMT

Yes, but I am still not sure what type of interrupt you want. Does the sensor that generate a interrupt signal, so that you just want to wake the nRF up on a pin interrupt? If so you can refer to the Pin Change Interrupt Example.

RE: how to wake up from sleep mode

ps_anu — Thu, 06 Dec 2018 08:58:24 GMT

i have called sd_app_evt_wait() in main loop

but it doesn't go to sleep

/**@brief Application main function.
 */
int main(void)

{
    bool erase_bonds;

    // Initialize.
    uart_init();
    log_init();
    timers_init();
    buttons_leds_init(&erase_bonds);
    power_management_init();
    ble_stack_init();
    gap_params_init();
    gatt_init();
    services_init();
    advertising_init();
    conn_params_init();
    


    // Start execution.
    printf("\r\nUART started.\r\n");
    NRF_LOG_INFO("Debug logging for UART over RTT started.");
    advertising_start();
    
    twi_init();
    LM75B_set_mode();
    
      while (true)
    {
        nrf_delay_ms(5000);

        do
        {
            __WFE();
        }while (m_xfer_done == false);
      
     
       
        // read_sensor_data();
       //  power_manage();
         threshold_value();
      sd_app_evt_wait();
        NRF_LOG_FLUSH();
    }
    }

help me

RE: how to wake up from sleep mode

ps_anu — Thu, 06 Dec 2018 06:14:26 GMT

did you get my question .........

RE: how to wake up from sleep mode

ps_anu — Wed, 05 Dec 2018 16:09:29 GMT

sorry for worse .... i will explain the process what i want to do ?

step by step

start ------> put the device in sleep mode ---------->> wake up by interrupting the sensor(using threshold)---------> send the data over ble_nus to ble_uart app -------------->> again it should go to sleep mode

is it possibleto to do above process ?

RE: how to wake up from sleep mode

ps_anu — Wed, 05 Dec 2018 15:54:46 GMT

HI....Einar ...

Here , i have the attached the step by step process.. what actually i want to do ...

tell me is it possible or not

pls see the pic

RE: how to wake up from sleep mode

Einar Thorsrud — Wed, 05 Dec 2018 13:35:23 GMT

Please be a bit more verbose in your questions, that way we will be able to help you much better. I still have no idea about how your system is intended to work and how you interact with the sensor and how you intend to trigger wakeup of the nRF.

RE: how to wake up from sleep mode

ps_anu — Wed, 05 Dec 2018 12:47:50 GMT

i want to put my device in sleep mode and wake up by interrupting the sensor

RE: how to wake up from sleep mode

ps_anu — Wed, 05 Dec 2018 12:46:35 GMT

is it possible to put in sleep mode before reading the thershold

RE: how to wake up from sleep mode

ps_anu — Wed, 05 Dec 2018 12:44:34 GMT

No... not like that ....... if it attains the threshold only it will send the data over ble until it will never enter the ble_nus

RE: how to wake up from sleep mode

Einar Thorsrud — Wed, 05 Dec 2018 12:37:18 GMT

Hi,

Please elaborate. What threshold point? How will you know that it has been hit? If it requires reading the temperature sensor, then clearly the nRF cannot sleep until the temperature reaches the threshold, as the nRF has no way of knowing. Without full information it seems to me that you need to wake up regularly to read the temperature sensor, and then do some task if the temperature has crossed your threshold. If that is the case you could for instance use the timer library to wake up regularly to measure the temperature.

RE: how to wake up from sleep mode

ps_anu — Wed, 05 Dec 2018 12:24:06 GMT

i am using temperature sensor .. i used the if condition ... if it reaches above the certain value in temperature then it should send the data in ble_uart app ,and then put the device in sleep mode .... in this case i want my device in sleep mode until the threshold point ......

RE: how to wake up from sleep mode

Einar Thorsrud — Wed, 05 Dec 2018 12:16:44 GMT

Hi,

What do you mean by "it attains threshold"? Do you want to trigger an interrupt when the voltage on a GPIO crosses a certain threshold? If so you could for instance use the LPCOMP.

RE: how to wake up from sleep mode

ps_anu — Wed, 05 Dec 2018 10:44:49 GMT

hi.... Einar ... i am confused how to put device in sleep mode before entering into process or function...

i want my device to sleep until it attains threshold ,, it will wake up by threshold and again it should go to sleep

how ??

suggest an idea

RE: how to wake up from sleep mode

ps_anu — Tue, 04 Dec 2018 12:49:08 GMT

thank you so much ... Einar ... i will implement it and get back

RE: how to wake up from sleep mode

Einar Thorsrud — Tue, 04 Dec 2018 11:50:22 GMT

You put it in sleep mode by calling sd_app_evt_wait() again. If you look at most of the SoftDevice examples you can see that they call sd_app_evt_wait() in the main loop. This way it always gets called once the interrupts have been processed.

RE: how to wake up from sleep mode

ps_anu — Tue, 04 Dec 2018 11:47:40 GMT

hi... Einar

Once I put in sleep mode it will wake up by interrupt and send the data and again I want to put in sleep mode after sending data how ?? Can I put the sleep mode again