an_compare.c

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/*
**
****************************************************************************
**
**
**             Copyright (c) 2007 - Atmel Corporation
**             Proprietaty Information
**
** Project     : ATMEGA88 + ATA6824 High Temperature H-bridge System
** Module      : an_compare.c
** Description : Analog comparator is used to detect over-currents
**                
**
** Version :     Date:         Author:      Comment:
**    1.0        05.03.2007    F.G.          Creation 
**
** LICENSE -
**
** ATMEL - 2007
** All software programs are provided 'as is' without warranty of any kind:
** Atmel does not state the suitability of the provided materials for any
** purpose. Atmel hereby disclaim all warranties and conditions with regard
** to the provided software, including all implied warranties, fitness for
** a particular purpose, title and non-infringement.In no event will Atmel
** be liable for any indirect or consequential damages or any damages
** whatsoever resulting from the usage of the software program.
****************************************************************************
**
*/

/*_____ I N C L U D E S ____________________________________________________*/
#include "config.h"
#include "an_compare.h"
#include "Timer0_PWM.h"

/*_____ M A C R O S ________________________________________________________*/

/*_____ D E F I N I T I O N S ______________________________________________*/

/*_____ P R O T O T Y P E S - D E C L A R A T I O N ________________________*/

/*_____ G L O B A L S ______________________________________________________*/

over_current_t over_current; 



void AN_compare_init(void)
{
  DIDR1 = (1<<AIN1D) | (1<<AIN0D);  // Disable digital buffers on AIN1 and AIN0
                                    // to reduce power consumption
  ACSR  = (1<<ACIE);                // Enable Analog comparator interrupts
                                    // on compare output toggle
}


#if defined(__ICCAVR__)             //IAR COMPILER USED
#pragma vector= ANA_COMP_vect       //Analog comparator vector for ATmega88
__interrupt void Over_current_ISR (void)

#elif defined (__AVR__)             // Avr-gcc compiler used
ISR(ANALOG_COMP_vect)
#endif
{
  if (ACSR & (1<<ACO))
  {                                 // Input max current reference > current
    RE_ENABLE_OCB0();               // Restore PWM output control
    over_current.status = false;
  }
  else                              // Over-current condition
  {                                 // Current > max current reference                  
    DISABLE_OCB0();                 // Release OCB0, PWM output
    over_current.occured = true;
    over_current.status = true;
  }
}

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