sleep_mode() power down breaks RF Communication

[Uma Maheswary]

Hi
I could run the LWmesh peer to peer application for my atmega256rfr2 devices.http://www.atmel.com/tools/lightweight_mesh.aspx.Now I modified the code for reducing power consumption in rf devices.The modified code for sending device is as follows

volatile int lastPIRsensorState=1;
volatile int PIRsensorState=0;
void Hibernate(){
set_sleep_mode(SLEEP_MODE_PWR_DOWN);
ADCSRA&=~(1<<7);
sleep_enable();
EICRA|=(1<<ISC00);
EIMSK|=(1<<INT0);
sei();
sleep_disable();
EIMSK&=~(1<<INT0);
cli();
}
ISR(INT0_vect){
PIRsensorState=!lastPIRsensorState;
}
static void appDataConf(NWK_DataReq_t *req){
appDataReqBusy=false;
(void)req;
}
static void appSendData(void){

if (appDataReqBusy)
    return;

 
  appDataReqBuffer[0]=PIRsensorState;
  appDataReq.dstAddr = 1-APP_ADDR;
  appDataReq.dstEndpoint = APP_ENDPOINT;
  appDataReq.srcEndpoint = APP_ENDPOINT;
  appDataReq.options = NWK_OPT_ENABLE_SECURITY;
  appDataReq.data = appDataReqBuffer;
  appDataReq.size = 1;
  appDataReq.confirm = appDataConf;
  NWK_DataReq(&appDataReq);
  appDataReqBusy = true;
}
static void appTimerHandler(SYS_Timer_t *timer)
{
  appSendData();
  (void)timer;
}
static void appInit(void)
{
  NWK_SetAddr(APP_ADDR);
  NWK_SetPanId(APP_PANID);
  PHY_SetChannel(APP_CHANNEL);
#ifdef PHY_AT86RF212
  PHY_SetBand(APP_BAND);
  PHY_SetModulation(APP_MODULATION);
#endif
  PHY_SetRxState(true);

 

  HAL_BoardInit();

  appTimer.interval = APP_FLUSH_TIMER_INTERVAL;
  appTimer.mode = SYS_TIMER_INTERVAL_MODE;
  appTimer.handler = appTimerHandler;
}

/*************************************************************************//**
*****************************************************************************/
static void APP_TaskHandler(void)
{
  switch (appState)
  {
    case APP_STATE_INITIAL:
    {
      appInit();
      appSendData();
      appState = APP_STATE_IDLE;
    } break;

    case APP_STATE_IDLE:
      break;


    default:
      break;
  }
}

/*************************************************************************//**
*****************************************************************************/
int main(void)
{
  SYS_Init();
  PORTD=1<<PD0
  HAL_UartInit(9600);
  while (1)
  {
    SYS_TaskHandler();
    HAL_UartTaskHandler();
    APP_TaskHandler();
   lastPIRsensorState=PIRsensorState;
   Hibernate();
  }
}

The device communication works well when the Hibernate() function is not called.But when this function is called it enters into a deep sleep and communicate seldom .dis sleep mode affect rf communication?What is the mistake in my code please help.

 

[pgib8]

i'm not going to dissect your code, but is it possible that when your mcu is in sleep, it's not grabbing data from the rf chip, so that the rf chip fills up? is the rf supposed to keep working while the mcu is in sleep?

 

[Uma Maheswary]

i'm not going to dissect your code, but is it possible that when your mcu is in sleep, it's not grabbing data from the rf chip, so that the rf chip fills up? is the rf supposed to keep working while the mcu is in sleep?

yes.I need the rf should keep working while the mcu is in sleep

 

[pgib8]

if the RF chip signals your MCU every time it received a packet, then your MCU reads out this data and so forth. If the MCU is sleeping, maybe it's possible this doesn't occur and the queue fills up. when the MCU wakes up again, the RF chip is full and won't send the signal that it received new packets. just a thought.