can we put the nrf(radio) in sleep mode or turn off

RE: can we put the nrf(radio) in sleep mode or turn off

Jørgen Holmefjord — Wed, 09 Jan 2019 09:59:55 GMT

You cannot compare anything while in sleep. You either need a timer to wake the chip at regular intervals to compare values, or you need some other interrupt that wakes the chip and allows you to do comparison. Where is the sample/threshold coming from?

RE: can we put the nrf(radio) in sleep mode or turn off

ps_anu — Wed, 09 Jan 2019 07:00:27 GMT

how i do ? how to compare the timer with sample (threshold) , and how to check it is in sleep

RE: can we put the nrf(radio) in sleep mode or turn off

Jørgen Holmefjord — Tue, 08 Jan 2019 09:09:10 GMT

Something in your application have to update the value that you compare against the threshold. In your code it looks like you use a timer to compare the sample with the threshold. The timer will wake the chip when it times out. When there is no more work for the CPU, you put it back to sleep with __WFE() or sd_app_evt_wait() in main loop.

RE: can we put the nrf(radio) in sleep mode or turn off

ps_anu — Tue, 08 Jan 2019 05:45:56 GMT

no , i will assign the threshold value..see the code below for reference

void timer_sensor_event_handler(void)
{   
uint32_t threshold = 32;
 char str[80];
uint32_t length1;
     char pavi;

 char event;
    
  
    
    switch (event)
    {
             
           
       if(m_sample < threshold)
            {
           length1 = sprintf(str,"%d", m_sample);
              ble_nus_data_send(&m_nus,str,sizeof(m_sample), m_conn_handle);
              ret_code_t err_code = nrf_drv_twi_rx(&m_twi, 0x48U, &m_sample, sizeof(m_sample));
               NRF_LOG_INFO("SUCCESS1");              
             }
  break;

        default:
            //Do nothing.
            break;
  }
}

RE: can we put the nrf(radio) in sleep mode or turn off

Jørgen Holmefjord — Mon, 07 Jan 2019 16:55:48 GMT

What will be your wakeup source when you know that you have data to transmit? Are you talking about an analog signal threshold?

RE: can we put the nrf(radio) in sleep mode or turn off

ps_anu — Mon, 07 Jan 2019 16:32:11 GMT

As per you said ,in system on mode the CPU can wake up by any event from Any peripheral ,in this case can we use threshold value to wake up ?

RE: can we put the nrf(radio) in sleep mode or turn off

ps_anu — Mon, 07 Jan 2019 16:19:25 GMT

Why ? Can't we put nrf in sleep mode

RE: can we put the nrf(radio) in sleep mode or turn off

Jørgen Holmefjord — Mon, 07 Jan 2019 14:22:16 GMT

Hi,

The nRF52 series have two sleep modes; system on and system off sleep mode. In System off, the system can only wake up from GPIO event, NFCT field, analog event from LPCOMP, or a reset. It sounds like this mode is not suitable for your requirements? In system on mode, the CPU can wakeup on any event from any peripheral, and is used in almost every example in the SDK (by calling __WFE() or sd_app_evt_wait()).

Best regards,
Jørgen