pwrmgmt.c

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/* This file has been prepared for Doxygen automatic documentation generation.*/
//#include "iom406_320.h"
#include <iom406.h>     // IAR headerfile for Mega406 (EW 410)
#include <inavr.h>

#define MODULE_PWRMGMT
#include "pwrmgmt.h"

#include "ee.h"
#include "analog.h"
#include "timer.h"


void SetPowerSaveMode(void);
void SetIdleMode(void);
void SetActiveMode(void);



//All Mode changes should use this routine in order to ensure that only
// valid state transitions are made.  See AVR453 for details.
void ChangePowerMode(unsigned char newmode, unsigned char shutdown_reason)
{
  switch (PowerMode)    //what mode are we presently in?
  {
    case POWERMODE_POWERSAVE:
      if(newmode == POWERMODE_ACTIVE)
        SetActiveMode();
      else
      if(newmode == POWERMODE_POWEROFF)
        DoShutdown(shutdown_reason);
      break;


    case POWERMODE_IDLE:
      if(newmode == POWERMODE_ACTIVE)
        SetActiveMode();
      else
      if(newmode == POWERMODE_POWERSAVE)
        SetPowerSaveMode();
      else
      if(newmode == POWERMODE_POWEROFF)
        DoShutdown(shutdown_reason);
      break;


    case POWERMODE_ACTIVE:
      if(newmode == POWERMODE_IDLE)
        SetIdleMode();
      else
      if(newmode == POWERMODE_POWERSAVE)
        SetPowerSaveMode();
      else
      if(newmode == POWERMODE_POWEROFF)
        DoShutdown(shutdown_reason);
      break;


    case POWERMODE_POWEROFF:
    default:
      if(newmode == POWERMODE_POWEROFF)
        DoShutdown(SHUTDOWN_REASON_UNKNOWNSTATE);
      else
        SetPowerSaveMode();
      break;
  }
}



void DoShutdown(unsigned char reason)
{
  __disable_interrupt();

  //store the REASON code in EEPROM
  while(EECR & (1<<EEPE));
  while(SPMCSR & (1<<SPMEN));
  EEAR = EESTORAGE_SHUTDOWNREASON;
  EEDR = reason;
  EECR = (0<<EEPM1) | (0<<EEPM0) | (0<<EERIE) | (1<<EEMPE) | (0<<EEPE) | (0<<EERE);     //arm
  EECR = (0<<EEPM1) | (0<<EEPM0) | (0<<EERIE) | (1<<EEMPE) | (1<<EEPE) | (0<<EERE);     //go
  while(EECR & (1<<EEPE));                                                              //wait until done

  SMCR = SLEEP_POWEROFF | (1<<SE);      //prep for power-off
  __sleep();
}


void SetPowerSaveMode(void)
{
  CCmode(CC_DISABLED);
  FCSR = 0;
  SMCR = SLEEP_POWERSAVE;
  PowerMode = POWERMODE_POWERSAVE;
  setWakeup(WU4sec, SLEEP_NONE);
}


void SetIdleMode(void)
{
  CCmode(CC_REGULAR);
  FCSR = ((1<<DFE) | (1<<CFE) | (1<<PFD));
  SMCR = SLEEP_IDLE;
  PowerMode = POWERMODE_IDLE;
}




void SetActiveMode(void)
{
  CCmode(CC_ACCUMULATE);
  FCSR = ((1<<DFE) | (1<<CFE) | (1<<PFD));
  SMCR = SLEEP_IDLE;
  PowerMode = POWERMODE_ACTIVE;
  setWakeup(WUoff,0);
}

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