CC2651R3SIPA: How to periodically wake up from standby mode to active mode

K.Z

Expert 2440 points

Part Number: CC2651R3SIPA
Other Parts Discussed in Thread: ENERGYTRACE

Tool/software:

Hi All

How do I periodically wake up the CC2651R3SIPA from standby mode to active mode using the RTC?

There is a timer in the RF core.
I think the RTC is used for periodic operation in standby mode.

I am concerned that if the RTC is used for periodic operation,
the CPU will also wake up when an RTC event occurs, increasing power consumption.

Is it possible to send advertisements using only the BLE module without waking up the CPU in standby mode?

Best Regards,

Ito

10 months ago

0 Alex Fager 10 months ago

TI__Genius 12391 points

Hello Ito,

I look into your descried event, and send over an example, note that the example will likely be out of an empty project so you will need to adapt it into an BLE environment.

Thanks,
Alex F

0 K.Z 10 months ago in reply to Alex Fager

Expert 2440 points

Hi Alex,

Thank you for your help.
I'm looking forward to it.

Best Regards,

Ito

0 Alex Fager 10 months ago in reply to K.Z

TI__Genius 12391 points

Hello K.Z

I hope you are doing well. So first is that we likely cannot directly modify the RTC with the application, reference the following threads about this:

https://e2e.ti.com/f/1/t/467792/

https://e2e.ti.com/f/1/t/478380/

However as an alternative we can try to use the Timer/GPTimer, for this I would recommend referencing the timerled example as it already has the environment setup with the timer. This should also be possible to implement in the BLE project as well!

K.Z said:
Is it possible to send advertisements using only the BLE module without waking up the CPU in standby mode?

-I am not entirely sure here, will need to ask another team member about if this is possible for BLE.

Thanks,
Alex F

0 K.Z 10 months ago in reply to Alex Fager

Expert 2440 points

Hi Alex F

Thank you for your help.

K.Z said:
Is it possible to send advertisements using only the BLE module without waking up the CPU in standby mode?

I am waiting for answer here.

I have one more question.

Please let me know if advertisement transmission is possible with RF core CPU only.
Although the customer is probably asking the main cpu question,
I believe that by running only the rf core cpu, current consumption can be reduced.

Best Regards,

Ito

0 Markel Robregado 10 months ago in reply to K.Z

Guru 86745 points

Hi K.Z

If the customer is running BLE example then the power management handles going to low power mode. See, document below.

https://www.ti.com/lit/an/swra478d/swra478d.pdf

Customer needs to understand what would add to current consumption such as open UART port or external circuitry.

-kel

0 Alex Fager 10 months ago in reply to K.Z

TI__Genius 12391 points

Hello K.Z

K.Z said:
Is it possible to send advertisements using only the BLE module without waking up the CPU in standby mode?

-No it is not possible to do this, the device has to wake up to handle and process the data.

Thanks,
Alex F

0 K.Z 10 months ago in reply to Alex Fager

Expert 2440 points

Hi Alex,

Thank you for your reply.

K.Z said:
Please let me know if advertisement transmission is possible with RF core CPU only.

How about the answer to this question.

Best Regards,

Ito

0 Alex Fager 10 months ago in reply to K.Z

TI__Genius 12391 points

Hello K.Z

In proprf, the application needs to setup the radio command, and "start" it, once started the radio will continuously send a command (if setup to do so).

In this case you are using BLE which I believe needs a bit more processing/setup, and I do not think its possibly just with the RF core only.

Thanks,
Alex F

0 K.Z 10 months ago in reply to Alex Fager

Expert 2440 points

Hi Alex,

I have checked the TimerLED sample code and I can confirm that it is waking up with GPIO interrupts.
I also think that when the timer peripheral is activated, it is prevented from transitioning to the standby mode.
From this, I think that the timer peripheral does not operate in the standby mode.

[Question]
How do I periodically wakeup from the standby state to the active state?
BLE is stopped in standby mode.

Best Regards,

Ito

0 Markel Robregado 10 months ago in reply to K.Z

Guru 86745 points

Hi K.Z.

If you are running a Bluetooth example program example simple peripheral, the power management does the work going to standby mode if there is no event like advertising. You would not know if it is in standby mode, if you do not have the proper test equipment like what is described from the document I shared. You can also try EnergyTrace at CCS.

-kel

0 K.Z 10 months ago in reply to Markel Robregado

Expert 2440 points

Hi kel,

Thank you for your reply.

Markel Robregado said:
If you are running a Bluetooth example program example simple peripheral, the power management does the work going to standby mode if there is no event like advertising.

Where is the Bluetooth example program example simple peripheral?
I will check with Enegy trace using it.

Best Regards,

Ito

0 Alex Fager 10 months ago in reply to K.Z

TI__Genius 12391 points

Hello Ito,

If you are looking for simple peripheral example:

C:\ti\simplelink_cc13xx_cc26xx_sdk_7_41_00_17\examples\rtos\LP_CC2651R3SIPA\ble5stack

SLA Bluetooth Low Energy 5 Connections

Thanks,
Alex F

0 K.Z 10 months ago in reply to Alex Fager

Expert 2440 points

Hi Alex,

Last question,
I don't know how to wake up from standby mode.
Is it not possible to wake up from standby mode with the Timer?
I understand that cannot wake up with RTC.

Best Regards,

Ito

+1 Markel Robregado 10 months ago in reply to K.Z

Guru 86745 points

Hi K.Z.

If you are using BLE example program like simple peripheral, this is how the power management works below.

No event - goes automatically from active mode to standby mode.

With event - goes automatically from standby mode to active mode.

Example of events are Bluetooth advertising, application events.

The events are processed at the RTOS Task. Example application event is the SBP_PERIODIC_EVT in the code below which occurs every 5 seconds if simple peripheral is connected to smartphone.

static void SimplePeripheral_taskFxn(UArg a0, UArg a1)
{
  // Initialize application
  SimplePeripheral_init();

  // Application main loop
  for (;;)
  {
    uint32_t events;

    // Waits for an event to be posted associated with the calling thread.
    // Note that an event associated with a thread is posted when a
    // message is queued to the message receive queue of the thread
    events = Event_pend(syncEvent, Event_Id_NONE, SBP_ALL_EVENTS,
                        ICALL_TIMEOUT_FOREVER);

    if (events)
    {
      ICall_EntityID dest;
      ICall_ServiceEnum src;
      ICall_HciExtEvt *pMsg = NULL;

      // Fetch any available messages that might have been sent from the stack
      if (ICall_fetchServiceMsg(&src, &dest,
                                (void **)&pMsg) == ICALL_ERRNO_SUCCESS)
      {
        uint8 safeToDealloc = TRUE;

        if ((src == ICALL_SERVICE_CLASS_BLE) && (dest == selfEntity))
        {
          ICall_Stack_Event *pEvt = (ICall_Stack_Event *)pMsg;

          if (pEvt->signature != 0xffff)
          {
            // Process inter-task message
            safeToDealloc = SimplePeripheral_processStackMsg((ICall_Hdr *)pMsg);
          }
        }

        if (pMsg && safeToDealloc)
        {
          ICall_freeMsg(pMsg);
        }
      }

      // If RTOS queue is not empty, process app message.
      if (events & SBP_QUEUE_EVT)
      {
        while (!Queue_empty(appMsgQueue))
        {
          sbpEvt_t *pMsg = (sbpEvt_t *)Util_dequeueMsg(appMsgQueue);
          if (pMsg)
          {
            // Process message.
            SimplePeripheral_processAppMsg(pMsg);

            // Free the space from the message.
            ICall_free(pMsg);
          }
        }
      }

      if (events & SBP_PERIODIC_EVT)
      {
        //Util_startClock(&periodicClock);

        // Perform periodic application task
        SimplePeripheral_performPeriodicTask();
      }

#if 0
      if(events & SBP_SCTASK_EVT)
      {
          //riza
          MyData_SetParameter_int(MYDATA_DATA_ID,
                              MYDATA_DATA_LEN,
                              adcValue_avg);
          //MyData_SetParameter(MYDATA_DATA_ID,
          //                    MYDATA_DATA_LEN,
          //                    &adcValue_avg);

      }
#endif
    }
  }
}

RTC and Timer can become events, if you just know how to make it an event that will be processed by RTOS task. But anyway you do not need to use RTC or timer for Bluetooth advertising.

-kel

0 K.Z 10 months ago in reply to Markel Robregado

Expert 2440 points

Hi Kel,

Thank you for your reply.

Can I also use SBP_PERIODIC_EVT as a reference for creating events with RTCs and timers?

Best Regards,

Ito

+1 Markel Robregado 10 months ago in reply to K.Z

Guru 86745 points

Hi K.Z

You can post an event or queue to the RTOS task. C functions at simple peripheral to do so.

Event_post(syncEvent, SBP_SCTASK_EVT);

SimplePeripheral_enqueueMsg()

For example at your timer interrupt can call the c functions above to process the event.

I can't find learning resource about it at the moment, but you can learn it by reviewing code.

-kel

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CC2651R3SIPA: How to periodically wake up from standby mode to active mode