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CCS ZigBee/ Ember board- sleepy mode current draw

 
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bruin
Guest
CCS ZigBee/ Ember board- sleepy mode current draw
PostPosted: Fri Jul 03, 2009 8:38 pm     Reply with quote
I'm trying to reduce the average current draw of the "sleepy" sensor portion of the CCS ZigBee development kit. Right now it's drawing around 7-10mA on average, even if I stop calling any of the ember functions. I suspect the chip itself has some timer which calls the coordinator periodically. How do I change this?

Am I supposed to do something in particular to put the EM260 to sleep? The EM260 chip is supposed to draw very little current in sleep, so I suspect I have to do something besides #define this is a sleepy sensor.

Thanks!
bruin
Guest
getting closer... still not there
PostPosted: Mon Jul 06, 2009 8:05 am     Reply with quote
I've figured out if I make NO_SLEEP 1 (make the device sleep after each command), I can make the device sleep - but the wireless connection no longer works (push the button to make the display increment). NO_SLEEP is used in EM260SendCommand.

If I make a new function such that EZSP_FRAME_CONTROL_INDEX is 1 only when the button is pressed, as below, but is 0 for sensorApplicationTick() and EM260Tick() commands, I don't get any current savings, but the button pushed/ increment function works.

Any help/ examples out there?

Thanks!
Code:
      while(TRUE)
      {
         sensorApplicationTick();
         EM260Tick();
         
         if(!input(PUSH_BUTTON1))
         {
            i++;
            messagedata[0]=i;
            ezspSendUnicastSleep(EMBER_OUTGOING_DIRECT,indexOrDestination,&apsframe,messagetag,messageLength,&messagedata[0]);
            delay_ms(1000);
         }
         if(!input(PUSH_BUTTON2))
         {
            i--;
            messagedata[0]=i;
            ezspSendUnicastSleep(EMBER_OUTGOING_DIRECT,indexOrDestination,&apsframe,messagetag,messageLength,&messagedata[0]);
            //delay_ms(200);
         }
      }
bruin
Guest
modified... still not there
PostPosted: Mon Jul 06, 2009 10:49 am     Reply with quote
I have modified the code, where I send a NOP command and that NOP calls the EM260SendCommand with the EM260SpiBuffer[EZSP_FRAME_CONTROL_INDEX]= 0x01;

The current on the Ember board is 3.8mA, which seems awfully high considering the deep sleep mode is supposed to draw 1uA.

Thanks!
Code:

      while(true)
      {   
         for(ii=0;ii<1;++ii)
         {
            sensorApplicationTick();
            EM260Tick();
               
            i++;
            messagedata[0]=i;
            ezspSendUnicast(EMBER_OUTGOING_DIRECT,indexOrDestination,&apsframe,messagetag,messageLength,&messagedata[0]);
            ezsp_response();
            delay_ms(500);   
         } 

         
         ezspNop();       
         while(input(PUSH_BUTTON1));
      }
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