BCM920736 deep sleep

[Anonymous]

Hi,

Is there any deep sleep mode document? I met a question when use the rtc_sample App demo.

it will restart after wakeup from sleep in this demo. how can I manage do not restart when wake up from sleep. below code is what I use.

#ifdef RTC_SAMPLE_ENTER_DEEP_SLEEP_AND_ENABLE_TIMED_WAKE

                {

                                static UINT32 num_timeouts_since_boot = 0;

                                // Demo going into deep sleep with wake after 5s.

                                if (num_timeouts_since_boot++ >= 10)

                                {

                                                // If its been ~10s of ADV, configure timed wake and

                                                // enter deep sleep right now.

                                                ble_trace0("Entering deep sleep.");

                                                gpio_configurePin(0, 0, 0x100, 0);

                                                // Configure the low power manager to enter deep sleep.

                                                devLpmConfig.disconnectedLowPowerMode = DEV_LPM_DISC_LOW_POWER_MODES_HID_OFF;

                                                // Configure the wake time in mS.

                                                devLpmConfig.wakeFromHidoffInMs = 5000;

                                                // Configure the reference clock to use.

                                                // Use the external 32k.

                                                devLpmConfig.wakeFromHidoffRefClk = HID_OFF_TIMED_WAKE_CLK_SRC_32KHZ;

                                                gpio_configurePin(0, 0, 0x100, 0);

                                                // Enter deep-sleep now. Will not return.

                                                devlpm_enterLowPowerMode();

                                }

                }

#endif

Thanks,

Lei

[BoonT_56]

This is a good blog on deep sleep:

Sleep Deep_Sleep Explanation and Techniques

Are you using an external 32KHz clock or the internal 128KHz clock?

Are you doing this on the tag3?

[Anonymous]

we use external 32KHz clock and test it on the tag3.

[Anonymous · Accepted solution]

In my experience, the chip always restarts.  It wakes up, loads from EEPROM/SFLASH to RAM, and starts executing.  You can however determine if you woke up from a:

1) POWER ON RESET - pushing the reset button or discontinuing and resupplying power

2) WAKE UP FROM A TIMER EVENT

3) WAKE UP FROM A BUTTON PUSH

We have the following logic spread in our code, so I didn't test this exact snippet, but it is basically like this:

       if (!mia_isResetReasonPor()) {

               if( mia_isResetReasonTimedWake()){

                   wake_reason = TIMED_WAKE;

                   ble_trace0("Waking from deep sleep because the TIMER went off );

              } else {

                    wake_reason  = BUTTON_PUSH;

                    ble_trace0("Waking from deep sleep because the BUTTON was pushed);

             }

       } else {

              ble_trace0("POR - POWER ON RESET - Not a timed wake.\n");

              wake_reason = POWER_ON_RESET;

       }

[MichaelF_56]

Thanks for the excellent feedback Cliff.