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/*
****************************************************************************
*
* simulavr - A simulator for the Atmel AVR family of microcontrollers.
* Copyright (C) 2001, 2002, 2003 Klaus Rudolph
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
****************************************************************************
*
* $Id$
*/
#ifndef HWACOMP
#define HWACOMP
#include "hardware.h"
#include "rwmem.h"
#include "irqsystem.h"
#include "pinatport.h"
#include "pinnotify.h"
#include "traceval.h"
// support input configuration for analog comparator and input capture event for timer,
// if it's possible by hardware
class HWAd;
class BasicTimerUnit;
//! Analog comparator peripheral
class HWAcomp: public Hardware,
public HasPinNotifyFunction,
public TraceValueRegister,
public IOSpecialRegClient,
public AnalogSignalChange {
protected:
HWIrqSystem *irqSystem; //!< connection to IRQ controller
PinAtPort pinAin0; //!< port pin AIN0
PinAtPort pinAin1; //!< port pin AIN1
Pin *v_bg; //!< get access to bandgap reference
Pin *v_cc; //!< get access to voltage supply level
bool useBG; //!< has ADBG register bit and can switch In0 to bandgap ref
bool acme_sfior; //!< ACME flag in SFIOR register is set
bool enabled; //!< analog comparator is enabled
unsigned char acsr; //!< ACSR register value
unsigned int irqVec; //!< stores the IRQ vector number
BasicTimerUnit *timerA; //!< connection to timerA for input capture event. NULL, if not available
BasicTimerUnit *timerB; //!< connection to timerB for input capture event. NULL, if not available
HWAd *ad; //!< connection to ADC for analog input mux. NULL, if not available
IOSpecialReg *sfior; //!< connection to SFIOR register, if necessary. NULL, if not used
unsigned char set_from_reg(const IOSpecialReg* reg, unsigned char nv);
unsigned char get_from_client(const IOSpecialReg* reg, unsigned char v) { return v; }
//! Check, if ACME flag is set (from ADC or SFIOR register)
bool isSetACME(void);
public:
enum {
ACD = 0x80,
ACBG = 0x40,
ACO = 0x20,
ACI = 0x10,
ACIE = 0x08,
ACIC = 0x04,
ACIS1 = 0x02,
ACIS0 = 0x01
};
IOReg<HWAcomp> acsr_reg; //!< ACSR IO register
//! constructor to instantiate a analog comparator peripheral
HWAcomp(AvrDevice *core,
HWIrqSystem *irqsys,
PinAtPort ain0,
PinAtPort ain1,
unsigned int irqVec,
HWAd *_ad,
BasicTimerUnit *_timerA,
IOSpecialReg *_sfior = NULL,
BasicTimerUnit *_timerB = NULL,
bool _useBG = true);
~HWAcomp();
//! Get method for ACSR register
unsigned char GetAcsr() { return acsr; }
//! Set method for ACSR register
void SetAcsr(unsigned char val);
//! Reset the unit
void Reset();
//! Reflect irq processing, reset interrupt source
void ClearIrqFlag(unsigned int vec);
//! Get informed about input pin change
void PinStateHasChanged(Pin *);
//! Get analog value for comparator input 0
float GetIn0(void);
//! Get analog value for comparator input 1
float GetIn1(void);
//! Return last state of analog comparator (assume, that this is correct, if unit is disabled)
bool GetACO(void) { return ((acsr & ACO) == ACO); }
// Interface for notify signal change in ADC multiplexer
void NotifySignalChanged(void);
};
#endif
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