8 Replies Latest reply on Aug 13, 2015 1:41 PM by JoMe_264151

Deep sleep cycling

userc_40943 Aug 13, 2015 10:36 AM

Attached is an image of Table 5. Power Modes System Status from the CYBL10X6X Family Datasheet.

Do I take this to mean that I can not wake up from Deep Sleep every 25ms by the ISR of a timer driven by an LFCLK clock whose source is WCO clk because no code is running in deep sleep?

Here is my code attempt:

CY_ISR(Timer25ms){

Timer_25ms_ReadStatusRegister(); //clears interrupt, found this in component datasheet

if (flop % 128==0)RED_Write(!RED_Read());

godeepsleep=1;

flop++;

}

Main loop is:

    while(1){
        if (godeepsleep==1){
            CySysClkEcoStop();
            CySysPmDeepSleep();
            CySysClkEcoStart(0);

            godeepsleep=0;
        }
    }

The code executes and flashes LED fine in debug mode (probably can't go to deep sleep in debug or something) but the device goes to deep sleep and never wakes up on its own powered by battery (shows current of 1ua so I know it goes to deep sleep).

Dale

Power Modes_0.jpg 59.1 K

1. Re: Deep sleep cycling

dakn_263916 Aug 13, 2015 11:16 AM (in response to userc_40943)

The part is woken up by the ISR and code execution then occurs.



These may be of some help -



http://www.cypress.com/?rID=78797     AN86233 - PSoC® 4 Low-Power Modes and Power Reduction Techniques

http://www.cypress.com/?rID=96072     AN90114 - PSoC® 4000 Family Low-Power System Design Techniques

http://www.cypress.com/?rID=110007     AN92584 - Designing for Low Power and Estimating Battery Life for BLE Applications

http://video.cypress.com/video-library/search/psoc+4+low+power/



http://www.cypress.com/?id=4&rID=94607     PSOC 4 SysTick



http://www.cypress.com/?id=5509 100 Projects in 100 Days with Bluetooth



Regards, Dana
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2. Re: Deep sleep cycling

JoMe_264151 Aug 13, 2015 11:28 AM (in response to userc_40943)

There is only the watchdog timer running in deep-sleep, no normal timer. Use that as your interrupt source and you will be woken up as expected.

Bob
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3. Re: Deep sleep cycling

userc_40943 Aug 13, 2015 11:32 AM (in response to userc_40943)

:) too much info, most I have seen.

So, if it is woken by the ISR, shouldn't my code work?
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4. Re: Deep sleep cycling

dakn_263916 Aug 13, 2015 11:34 AM (in response to userc_40943)
Project 27, 38, 41 may help, see attached.



http://www.cypress.com/?id=5509 100 Projects in 100 Days with Bluetooth



Regards, Dana.

100 Projects in 100 Days_0.xls 60.0 K
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5. Re: Deep sleep cycling

userc_40943 Aug 13, 2015 1:12 PM (in response to JoMe_264151)

Bob,

That was it! Just set WDT1 to 25ms with interrupt and then I only need code in main loop for WakeUp, Do Something, Go back to sleep for another 25ms:

    while(1){
            CySysClkEcoStop();
            CySysPmDeepSleep();
            CySysClkEcoStart(0);
            RED_Write(0);
            RED_Write(1);
    }

Not sure why direct into deep sleep and then empty main loop shows correct 1ua current and my code ups that to 11ua though.

1ua of that is the LED blip and the rest must be 12mhz PRoC active average over 25ms.

Thanks!!!
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6. Re: Deep sleep cycling

dakn_263916 Aug 13, 2015 12:23 PM (in response to userc_40943)
Here is a table from PSOC 4 Ap Note that shows generally speaking what is "alive" in

what modes, attached.



Regards, Dana.

PSOC Power Table Acvtive Peripherals.png 76.6 K
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7. Re: Deep sleep cycling

userc_40943 Aug 13, 2015 1:09 PM (in response to userc_40943)

Much better than the table I posted but I still would not have guessed only the WDT's were available in deep sleep
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8. Re: Deep sleep cycling

JoMe_264151 Aug 13, 2015 1:41 PM (in response to userc_40943)

That's why they call it Deep Sleep.   ;-)



Bob
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