ATmegaCodeGenerator Class Reference

Target ATmega micro-controller (AVR8) More...

#include <cgp_atmega.h>

Inheritance diagram for ATmegaCodeGenerator:

Protected Member Functions
void	DoCompile (void)
	add my preferences to DoCompile
void	DoGenerate (void)
	protected version of generate
virtual void	InitialisePorts (void)
	reimplemented/additional code blocks
virtual void	DoReadTargetConfiguration (TokenReader &rTr)
	File i/o. More...
virtual void	DoWriteTargetConfiguration (TokenWriter &rTw) const
	File i/o. More...
Protected Member Functions inherited from EmbeddedcCodeGenerator
void	DoCompile (void)
	add my preferences to DoCompile
void	DoGenerate (void)
	virtual hook for generate
virtual void	DecrementTimers (void)
	re-implemented/additional code blocks
void	InsertExecHooks (void)
	Helper to insert target code for execution hooks.
AX	IntarrayConstant (int offset, const std::vector< int > &val)
AX	WordarrayConstant (int offset, const std::vector< word_t > &val)
AX	StrarrayConstant (int offset, const std::vector< std::string > &val)
virtual void	Comment (const std::string &text)
	Target comments (see EmbeddedcCodeGenerator for consistent reimplementation pattern)
virtual void	IntegerDeclare (const AA &address)
virtual void	IntegerDeclare (const AA &address, int val)
virtual void	IntegerAssign (const AA &address, int val)
virtual void	IntegerAssign (const AA &address, const AX &expression)
virtual void	IntegerIncrement (const AA &address, int val=1)
virtual AX	IntegerQuotient (const AX &expression, int val)
virtual AX	IntegerRemainder (const AX &expression, int val)
virtual AX	IntegerBitmask (const AX &expression)
virtual AX	IntegerIsEq (const AA &address, int val)
virtual AX	IntegerIsEq (const AA &address, const AX &expression)
virtual AX	IntegerIsNotEq (const AA &address, int val)
virtual AX	IntegerIsNotEq (const AA &address, const AX &expression)
virtual AX	IntegerIsGreater (const AA &address, int val)
virtual AX	IntegerIsLess (const AA &address, int val)
virtual AX	IntegerConstant (int val)
virtual bool	HasIntmaths (void)
virtual void	WordDeclare (const AA &address)
virtual void	WordDeclare (const AA &address, word_t val)
virtual void	WordAssign (const AA &address, word_t val)
virtual void	WordAssign (const AA &address, const AX &expression)
virtual void	WordOr (const AA &address, word_t val)
virtual void	WordOr (const AA &address, const AX &expression)
virtual void	WordOr (const AA &address, const AA &op1, const AA &op2)
virtual void	WordOr (const AA &address, const AA &op1, word_t op2)
virtual void	WordAnd (const AA &address, word_t val)
virtual void	WordAnd (const AA &address, const AX &expression)
virtual void	WordAnd (const AA &address, const AA &op1, const AA &op2)
virtual void	WordAnd (const AA &address, const AA &op1, word_t op2)
virtual void	WordNand (const AA &address, const AX &expression)
virtual AX	WordIsBitSet (const AA &address, int idx)
virtual AX	WordIsBitClr (const AA &address, int idx)
virtual AX	WordIsMaskSet (const AA &address, word_t mask)
virtual AX	WordIsEq (const AA &address, word_t val)
virtual AX	WordIsNotEq (const AA &address, word_t val)
virtual AX	WordConstant (word_t val)
virtual AX	StringConstant (const std::string &val)
virtual bool	HasCintarray (void)
virtual bool	HasCwordarray (void)
virtual bool	HasCstrarray (void)
virtual void	IntarrayDeclare (const AA &address, int offset, int len)
	default int-array: not supported
virtual void	IntarrayDeclare (const AA &address, int offset, const std::vector< int > &val)
	default int-array: not supported
virtual AA	IntarrayAccess (const AA &address, int index)
	default int-array: not supported
virtual AA	IntarrayAccess (const AA &address, const AA &indexaddr)
	default int-array: not supported
virtual bool	HasIntarray (void)
	default int-array: not supported
virtual void	WordarrayDeclare (const AA &address, int offset, int len)
virtual void	WordarrayDeclare (const AA &address, int offset, const std::vector< word_t > &val)
virtual AA	WordarrayAccess (const AA &address, int index)
virtual AA	WordarrayAccess (const AA &address, const AA &indexaddr)
virtual bool	HasWordarray (void)
virtual void	IfTrue (const AX &expression)
virtual void	IfFalse (const AX &expression)
virtual void	IfWord (const AX &expression)
virtual void	IfElse (void)
virtual void	IfElseIfTrue (const AX &expression)
virtual void	IfEnd (void)
virtual void	SwitchBegin (const AA &address)
virtual void	SwitchCase (const AA &address, int val)
virtual void	SwitchCases (const AA &address, int from, int to)
virtual void	SwitchCases (const AA &address, const std::set< int > &vals)
virtual void	SwitchBreak (void)
virtual void	SwitchEnd (void)
virtual bool	HasMultiCase (void)
virtual void	LoopBegin (void)
virtual void	LoopBreak (const AX &expression)
virtual void	LoopEnd (void)
virtual void	FunctionReturn (void)
virtual void	RunActionExe (const AX &expression)
virtual void	TimerDeclare (const AA &address, const std::string &litval)
virtual void	TimerStart (const AA &address)
virtual void	TimerStop (const AA &address)
virtual void	TimerReset (const AA &address, const std::string &litval)
virtual AX	TimerIsElapsed (const AA &address)
Protected Member Functions inherited from CodePrimitives
virtual void	DoGenerateDeclarations (void)
	cut-and-paste template for code snippet assembly
virtual void	DoGenerateResetCode (void)
	cut-and-paste template for code snippet assembly
virtual void	DoGenerateCyclicCode (void)
	cut-and-paste template for code snippet assembly
virtual void	LiteralPrepend (void)
	Cosmetic: prepend literally from configuration data.
virtual void	DeclareStatus (void)
	Declare "status".
virtual void	DeclareReset (void)
	Declare "reset".
virtual void	DeclareRecentEvent (void)
	Declare "recent_event".
virtual void	DeclareParallelState (void)
	Declare "parallel_state".
virtual void	DeclarePendingEvents (void)
	Declare "pending_events" and "enabled_events".
virtual void	DeclareLoopState (void)
	Declare loop state, i.e. line levels, loop flag.
virtual void	DeclareTimers (void)
	Use target implementation to declare timers, typically "timer_run_*" and "timer_cnt_*".
virtual void	DeclareAux (void)
	Declare variables local to the provided snippets, e.g. helpers for bit-mask computation.
virtual void	DeclareLargeCarray (void)
	Declare compiled transition relations.
virtual void	DeclareSmallCarray (void)
	Declare bit-mask loop-ups.
virtual void	DeclareEventNameLookup (void)
	Declare symbolic name lookup tables.
virtual void	DeclareStateNameLookup (void)
	Declare symbolic name lookup tables.
virtual void	ResetState (void)
	Reset state.
virtual void	ResetReturn (void)
	Reset bail out.
virtual void	SenseInputs (void)
	Sense input events and add to "pending_events".
virtual void	SenseTimerElapse (void)
	Sense timer elapse vents and add to "pending_events".
virtual void	BeginExecutionLoop (void)
	Execution Loop, begin.
virtual void	UpdateEnabled (void)
	Update "enabled_events" from "parallel_state" if "exec_event" was set.
virtual void	ScheduleEvent (void)
	Select event to execute from "pending_and_enabled_events" or "enabled_events".
virtual void	BreakExecutionLoop (void)
	Execution Loop, break.
virtual void	ExecuteEvent (void)
	Take transition and figure new state.
virtual void	OperateTimers (void)
	Start/stop/reset timers w.r.t. "exec_event".
virtual void	OperateOutputs (void)
	Operate output lines w.r.t. "exec_event".
virtual void	EndExecutionLoop (void)
	Loop end.
virtual void	LiteralAppend (void)
	Cosmetic: append literally from configuration.
virtual void	ExecuteEventBySwitching (void)
	Alternative implementation of ExecuteEvent()
virtual void	ExecuteEventByInterpreter (void)
	Alternative implementation of ExecuteEventBy()
virtual void	UpdateEnabledBySwitching (void)
	Alternative implementations UpdateEnabled()
virtual void	UpdateEnabledByInterpreter (void)
	Alternative implementations UpdateEnabled()
virtual std::string	TargetSymbol (const std::string &str)
	Mangle string to valid target symbol.
virtual void	IntegerDecrement (const AA &address, int val=1)
virtual void	BooleanDeclare (const AA &address)
virtual void	BooleanDeclare (const AA &address, int val)
virtual void	BooleanAssign (const AA &address, int val)
virtual void	BooleanAssign (const AA &address, const AX &expression)
virtual AX	BooleanIsEq (const AA &op1, const AA &op2)
virtual AX	BooleanIsNotEq (const AA &op1, const AA &op2)
virtual void	BitarrayDeclare (const AA &address, int blen)
virtual void	BitarrayDeclare (const AA &address, const std::vector< bool > &val)
virtual void	BitarrayAssign (const AA &address, const std::vector< bool > &val)
virtual void	BitarrayAssign (const AA &address, const AA &otherarray)
virtual void	BitarrayClear (const AA &address)
virtual void	BitarrayFull (const AA &address)
virtual void	BitarraySetBit (const AA &address, int bitaddr)
virtual void	BitarraySetBit (const AA &address, const AA &indexaddr, int offset=0, const std::vector< bool > &hint=std::vector< bool >())
virtual void	BitarrayClrBit (const AA &address, int bitaddr)
virtual void	BitarrayClrBit (const AA &address, const AA &indexaddr, int offset=0, const std::vector< bool > &hint=std::vector< bool >())
virtual void	BitarrayIsBitSet (const AA &address, const AA &indexaddr, const AA &result, int offset=0, const std::vector< bool > &hint=std::vector< bool >())
virtual void	BitarrayOr (const AA &address, const std::vector< bool > &val)
virtual void	BitarrayOr (const AA &address, const AA &op1, const std::vector< bool > &op2)
virtual void	BitarrayOrAllWords (const AA &address, const AA &result)
virtual void	BitarrayAnd (const AA &address, const std::vector< bool > &val)
virtual void	BitarrayAnd (const AA &address, const AA &otherarray)
virtual void	BitarrayAnd (const AA &address, const AA &op1, const AA &op2)
virtual void	BitarrayAnd (const AA &address, const AA &op1, const std::vector< bool > &op2)
virtual void	BitarrayFindFirst (const AA &address, const AA &result, int offset=0)
virtual void	EventSetDeclare (const AA &address)
virtual void	EventSetDeclare (const AA &address, const EventSet &evset)
virtual void	EventSetAssign (const AA &address, const EventSet &evset)
virtual void	EventSetInsert (const AA &address, const EventSet &evset)
virtual void	EventSetInsert (const AA &address, Idx ev)
virtual void	EventSetInsert (const AA &address, const AA &evaddr)
virtual void	EventSetInsert (const AA &address, const AA &evaddr, const EventSet &hint)
virtual void	EventSetErase (const AA &address, const EventSet &evset)
virtual void	EventSetErase (const AA &address, Idx ev)
virtual void	EventSetErase (const AA &address, const AA &evaddr)
virtual void	EventSetErase (const AA &address, const AA &evaddr, const EventSet &hint)
virtual void	EventSetExists (const AA &address, const AA &evaddr, const AA &result, const EventSet &hint)
virtual void	EventSetRestrict (const AA &address, const AA &otherset)
virtual void	EventSetUnion (const AA &address, const AA &op1, const EventSet &op2)
virtual void	EventSetIntersection (const AA &address, const AA &op1, const EventSet &op2)
virtual void	EventSetClear (const AA &address)
virtual void	EventSetFull (const AA &address)
virtual void	EventSetIsNotEmpty (const AA &address, const AA &result)
virtual void	EventSetFindHighestPriority (const AA &address, const AA &result)
virtual AX	InputExpression (const std::string &expression)
virtual int	StateTargetIdx (size_t git, Idx idx)
	Overload base class to use the vector address only if the respective code option is active)
virtual Idx	StateFaudesIdx (size_t git, int idx)
	Overload base class to use the vector address only if the respective code option is active)
virtual void	VariableDeclare (const std::string &laddr, const std::string &ltype)
	declaration template (optional to facilitate declaration constructs)
virtual void	VariableDeclare (const std::string &laddr, const std::string &ltype, const std::string &lval)
	Overload base class to use the vector address only if the respective code option is active)
Protected Member Functions inherited from CodeGenerator
virtual void	DoRead (TokenReader &rTr, const std::string &rLabel="", const Type *pContext=0)
	Read the configuration from TokenReader, see faudes Type for public wrappers. More...
virtual void	DoWrite (TokenWriter &rTw, const std::string &rLabel="", const Type *pContext=0) const
	Writes the configuration to TokenWriter, see faudes Type for public wrappers. More...

Protected Attributes
bool	mATmegaProgmem
	ATmega code options.
bool	mATmegaPullups
	ATmega code options.
std::string	mATmegaPgmReadInteger
	ATmega code options.
std::string	mATmegaPgmReadWord
	ATmega code options.
Protected Attributes inherited from CodePrimitives
std::string	mWordType
	target data type for word
std::string	mIntegerType
	target data type for integer
std::string	mPrefix
	universal prefix (pseudo name space)
bool	mArrayForTransitions
	code option: use const array to represent transitions
bool	mMaintainStateIndices
	code option: use state indices as provided
bool	mBitAddressArithmetic
	code option: compute bit and word address on target
bool	mArrayForBitmasks
	code option: use const array to represent bit-masks
bool	mArrayForBitarray
	code option: use const array to represent bit-masks
bool	mBisectionForBitfind
	code option: use bisection to fing lowest set bit
bool	mArrayForState
	code option: use int arrays to represent that overall state
bool	mEventsetsForPerformance
	code option: eventsets for performance
bool	mLoopPendingInputs
	code option: loop until all inputs are resolved
bool	mLoopEnabledOutputs
	code option: loop until all enabled outputs are executed
bool	mStrictEventSynchronisation
	code option: strict event synchronisation
bool	mEventNameLookup
	code option: event name lookup
bool	mStateNameLookup
	code option: state name lookup
std::vector< bool >	mHasStateNames
	record per generator whether there is a lookup table
bool	mExistStateNames
	record whether there exist statenames at all
std::string	mEventExecutionHook
	code option: event exec hook
std::string	mStateUpdateHook
	code option: state change hook
std::string	mLiteralPrepend
	extra code to prepend
std::string	mLiteralAppend
	extra code to prepend
std::map< std::string, bitarray_rec >	mBitarrays
	Record of all declared bit-arrays.
Protected Attributes inherited from CodeGenerator
std::string	mName
	faudes object name (aka project name)
std::vector< TimedGenerator >	mGenerators
	list of executors
std::vector< std::string >	mGeneratorNames
	list of filenames when generator are read from file
cgEventSet	mAlphabet
	event configuration by attributes
int	mWordSize
	compressed boolean capacity of target type word
int	mIntegerSize
	compressed boolean capacity of target type integer
std::map< Idx, int >	mEventBitAddress
	mapping from faudes event idx to bit address (descending priority, range 0 . More...
std::map< int, Idx >	mEventFaudesIdx
	mapping from bit address to faudes event idx
int	mLastInputEvent
	highest bit-address with input (or timer) event (-1 for none)
int	mLastOutputEvent
	highest bit-address with output event (-1 for none)
std::vector< std::map< Idx, int > >	mStateVectorAddress
	mapping from faudes state idx to vector index
std::vector< std::map< int, Idx > >	mStateFaudesIndex
	mapping from vector state idx to faudes index
std::vector< bool >	mUsingVectorAddressStates
	configuration of state indexing per generator
std::vector< std::vector< int > >	mTransitionVector
	compiled transition-sets, represented as vectors of integers with 0 as separator
EventSet	mUsedEvents
	configured events that are referred to by some generator
EventSet	mOutputEvents
	used events that are configured as outputs
EventSet	mInputEvents
	used events that are configured as inputs (incl timer)
EventSet	mInternalEvents
	used events that are configured as internal events (excl. More...
std::map< std::string, LineAddress >	mLines
	input event generation
std::map< std::string, FlagExpression >	mFlags
	input event generation
std::map< std::string, TimerConfiguration >	mTimers
	timer definitions
std::map< std::string, ActionAddress >	mActionAddresses
	action addresses
std::map< std::string, TimerAction >	mTimerActions
	timer actions by event name
int	mVerbLevel
	diagnpstic-output level
std::string	mOutMode
	output file name (base)
char	mMuteMode
	current output mode
bool	mMuteComments
	mute comments
std::string	mRecentMutedComment
	recent muted comment
std::ostream *	pOutStream
	output stream
std::ostream *	pErrStream
	error stream

Basic Class Maintenance
	ATmegaCodeGenerator (void)
virtual	~ATmegaCodeGenerator (void)
virtual void	Clear (void)

Re-Implemented Code Primitives
virtual AX	TargetExpression (const AA &address)
	abstract address conversion
virtual std::string	TargetAddress (const AA &address)
	abstract address conversion
void	CintarrayDeclare (const AA &address, int offset, const std::vector< int > &val)
AA	CintarrayAccess (const AA &address, int index)
AA	CintarrayAccess (const AA &address, const AA &indexaddr)
void	CwordarrayDeclare (const AA &address, int offset, const std::vector< word_t > &val)
AA	CwordarrayAccess (const AA &address, int index)
AA	CwordarrayAccess (const AA &address, const AA &indexaddr)
void	CstrarrayDeclare (const AA &address, int offset, const std::vector< std::string > &val)
AA	CstrarrayAccess (const AA &address, int index)
AA	CstrarrayAccess (const AA &address, const AA &indexaddr)
void	RunActionSet (const std::string &address)
void	RunActionClr (const std::string &address)
AX	ReadInputLine (const std::string &address)

Additional Inherited Members
Public Types inherited from CodeGenerator
enum	OutSink { CONSOLE , FILE , STRING }
typedef std::vector< TimedGenerator >::const_iterator	Iterator
	Iterator for read-only access of generators.
typedef unsigned long	word_t
	Code-generator internal data type of target words.
typedef std::map< std::string, LineAddress >::iterator	LineIterator
	Access to line records by iterator.
typedef std::map< std::string, FlagExpression >::iterator	FlagIterator
	Access to flag records by iterator.
typedef std::map< std::string, TimerConfiguration >::iterator	TimerIterator
	Access to timer records by iterator.
typedef std::map< std::string, ActionAddress >::iterator	ActionAddressIterator
	Access to action record by iterator.
typedef std::map< std::string, TimerAction >::iterator	TimerActionIterator
	Access to timer records by iterator.
Public Member Functions inherited from EmbeddedcCodeGenerator
	EmbeddedcCodeGenerator (void)
	Constructor.
virtual	~EmbeddedcCodeGenerator (void)
	Explicit destructor.
Public Member Functions inherited from CodePrimitives
	CodePrimitives (void)
	Constructor.
virtual	~CodePrimitives (void)
	Explicit destructor.
Public Member Functions inherited from CodeGenerator
Idx	Size (void) const
	Number of generators.
void	Insert (const std::string &file)
	Add a Generator from file. More...
void	Insert (const TimedGenerator &rGen)
	Add a generator by reference. More...
const TimedGenerator &	At (int i) const
	Direct access for read-only access of generators.
Iterator	Begin (void) const
	Begin-iterator for read-only access of generators.
Iterator	End (void) const
	End-iterator for read-only access of generators.
virtual int	EventTargetIdx (Idx idx)
	Get target event Idx from faudes Idx (use bit-address + 1)
virtual int	EventTargetIdx (const std::string &ev)
	Get target event Idx from faudes name (use bit-address + 1)
int	EventBitAddress (Idx idx)
	Get event bit-address from faudes Idx (consecutive, starts at 0)
Idx	EventFaudesIdx (int idx)
	Get faudes Idx from target Idx (aka from bit-address + 1)
std::vector< bool >	EventBitMask (Idx idx)
	Get vector representation for a single faudes event Idx.
std::vector< bool >	EventBitMask (const EventSet &eset)
	Get vector representation for faudes event set.
int	EventBitMaskSize (void)
	Get overall number of events.
word_t	WordFromBitVector (const std::vector< bool > &vect, int wordindex)
	Extract individual word from boolean vector.
std::vector< word_t >	WordVectorFromBitVector (const std::vector< bool > &vect)
	Convert boolean vector to word array.
LineIterator	LinesBegin ()
	Access to line records by iterator.
LineIterator	LinesEnd ()
	Access to line records by iterator.
FlagIterator	FlagsBegin ()
	Access to flag records by iterator.
FlagIterator	FlagsEnd ()
	Access to flag records by iterator.
TimerIterator	TimersBegin ()
	Access to timer records by iterator.
TimerIterator	TimersEnd ()
	Access to timer records by iterator.
ActionAddressIterator	ActionAddressesBegin ()
	Access to action addresses by iterator.
ActionAddressIterator	ActionAddressesEnd ()
	Access to action addresses by iterator.
TimerActionIterator	TimerActionsBegin ()
	Access to timer records by iterator.
TimerActionIterator	TimerActionsEnd ()
	Access to timer records by iterator.
	CodeGenerator (void)
	Constructor.
virtual	~CodeGenerator (void)
	Destructor.
virtual void	Name (const std::string &rName)
	Set objects's name (reimplementing base faudes::Type) More...
virtual const std::string &	Name (void) const
	Get objects's name (reimplementing base faudes::Type) More...
virtual void	Compile (void)
	Compile input data for alternative representation. More...
Idx	EventIndex (const std::string &rName) const
	Faudes-event index lookup. More...
std::string	EventName (Idx index) const
	Faudes-event name lookup. More...
const AttributeCodeGeneratorEvent &	EventAttribute (Idx ev) const
	Event configuration attribute lookup. More...
void	EventAttribute (Idx ev, const AttributeCodeGeneratorEvent &attr)
	Set event attribute. More...
void	Alphabet (const cgEventSet &rAlphabet)
	Set all event attributes. More...
const cgEventSet &	Alphabet (void) const
	Access alphabet (incl event attributes) More...
const std::vector< int > &	TransitionVector (size_t git)
	Get target state index (refer to vector representation as default, overload in CodePrimitives)
virtual void	Generate (void)
	Generate code. More...
void	Verbose (int level, std::ostream *altout=0)
	Set verbosity level. More...
virtual void	OutputMode (const std::string &mode)
	Set code output mode. More...
std::string	OutputMode (void)
	Report code output mode. More...
virtual std::ostream &	Output (void)
	Output stream. More...
const std::string &	OutputString (void)
	Get accumulated output as string. More...
void	OutputString (const std::string &strbuf)
	Set output to string. More...
virtual void	MuteMode (char mode)
	Set current mute mode. More...
virtual void	MuteCond (char mode)
	Set mode condition. More...
virtual void	LineFeed (int lines=1)
	LineFeed (convenience support for derived classes)
virtual std::string	LineCount (void)
	LineFeed (convenience support for derived classes)
virtual void	IndentInc ()
	Indentation (convenience support for derived classes)
virtual void	IndentDec ()
	Indentation (convenience support for derived classes)
std::string	RecentComment (void)
	Recent muted comment (convenience support for derived classes)
virtual void	XmlTextEscape (bool on)
	XmlTextEscape (escape "<", ">", "&", "\"" and "'")
virtual void	XmlCdataEscape (bool on)
	XmlCdataEscape (escape "]]>")
virtual void	MuteComments (bool on)
	Mute comments (convenience support for derived classes)
virtual void	MuteVspace (bool on)
	Mute empty lines (convenience support for derived classes)
Static Public Member Functions inherited from CodeGenerator
static std::string	VersionString (void)
	Version (refers to macro COMPILEDES_VERSION, defined in cgp_codegenerator.h)
static void	Register (const std::string &type, CodeGenerator *(*newcg)(void))
	Insert derived class in the registry. More...
static std::vector< std::string >	Registry (void)
	Access registry contents. More...
static CodeGenerator *	New (const std::string &type)
	Instantiate by identifier (returns 0 on unknown class) More...
Public Attributes inherited from CodeGenerator
std::vector< int >	mWordAddressVector
	Look-up table to map a bit-address to the word-index.
std::vector< word_t >	mBitMaskVector
	Look-up table to map a bit-address to the word-bitmask.

Detailed Description

This code generator is derived from EmbeddedcCodeGenerator to further shape the output to fit ATMEL 8bit micro-controllers from the ATmega and ATtiny series – not the Xmega series, however, adaption should be straight forward. The generated C-code compiles with the avr-gcc toolchain and addresses two target specific features.

The ATmegaCodeGenerator supports the use of native GPIO pin addresses in Set/Clr output actions and as input triggers; e.g., PB3 for port B pin 3. The generated code includes the additional function PREFIX_initpio() to initialise all referenced output pins by setting the corresponding flag in the DDR register.

The following additional code-options are supported.

ATmegaPullups. When this option is set, the function PREFIX_initpio() will include code to enable the pullup option of all referenced input pins. Example:

<ATmegaPullups val="true"/>

ATmegaProgmem. When this option is set, constant arrays like those used for precompiled transition relations will reside in the program-memory eeprom as opposed to the RAM area. This introduces some performance penalty, however, RAM is a bottleneck on ATmega devices. Example:

<ATmegaProgmem val="true"/>

The below example for an Arduino Nano board illustrates a typical overall implementation pattern.

// device main clock (16MHz for ATmega328)
#define F_CPU 16000000UL  // 16MHz for Arduino Nano
 
// std includes
#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/pgmspace.h>
 
// include generated code
#include "blink_atm.c"
 
// system time as 8bit value updated by 100Hz interrupt
volatile unsigned char systime;
 
// 100Hz interrupt driven by timer0
ISR(TIMER0_COMPA_vect){
  ++systime;
}
 
// entry point
int main(void){
  // aux var to figure cycle time
  unsigned char  systime_recent;
  // initialise system clock (ATmega328 specific)
  CLKPR = (1<<CLKPCE);   // enable pre-scaler write access
  CLKPR = 0x00;          // no clock pre-scale, i.e. F_CPU 16MHz
  // run timer0 to drive 100Hz interrupt (ATmega328)
  sei();                             // enable interrupts
  TCNT0=0;                           // reset count
  OCR0A=160;                         // set top to 160
  TIMSK0= (1 << OCIE0A);             // interrupt on match top
  TCCR0A= (1 << WGM01);              // clear-on-top mode
  TCCR0B= (1 << CS00) | (1 << CS02); // run at clk_IO/1024 i.e. 16kHz
  // initialise output pins by generated code
  PREFIX_initpio();
  // loop forever
  while(1) {
    // generated code to sense and execute events
    PREFIX_cyclic();
    // figure cycle time
    unsigned char now= systime;
    unsigned char dt= now-systime_recent;
    systime_recent+= dt;
    // generated code to update timers
    PREFIX_timerdec(dt);
  }
  return 0;
}

The implementation of system time renders one time unit to correspond to 10ms. Note that the the system time systime will overflow every 2.56sec, i.e., the cycle time must not be any longer. Nevertheless, the generated timers can handle arbitrary long durations according to their bit-size. The toy example blink_atm.cgc was used for validation on an Arduino Nano board.

Definition at line 116 of file cgp_atmega.h.

Constructor & Destructor Documentation

ATmegaCodeGenerator()

ATmegaCodeGenerator::ATmegaCodeGenerator

(

void

)

Constructor

Definition at line 32 of file cgp_atmega.cpp.

~ATmegaCodeGenerator()

ATmegaCodeGenerator::~ATmegaCodeGenerator ( void  )

virtual

Explicit destructor.

Definition at line 37 of file cgp_atmega.cpp.

Member Function Documentation

Clear()

void ATmegaCodeGenerator::Clear ( void  )

virtual

Clear all data.

Reimplemented from EmbeddedcCodeGenerator.

Definition at line 43 of file cgp_atmega.cpp.

DoReadTargetConfiguration()

void ATmegaCodeGenerator::DoReadTargetConfiguration ( TokenReader &  rTr )

protectedvirtual

Reads global configuration from TokenReader, excl. label

Parameters

rTr	TokenReader to read from

Exceptions

Exception

token mismatch (id 502) IO error (id 1)

Reimplemented from EmbeddedcCodeGenerator.

Definition at line 59 of file cgp_atmega.cpp.

DoWriteTargetConfiguration()

void ATmegaCodeGenerator::DoWriteTargetConfiguration ( TokenWriter &  rTw ) const

protectedvirtual

Write global configuration to TokenWriter, excl. label

Parameters

rTw	Reference to TokenWriter

Exceptions

Exception

IO errors (id 2)

Reimplemented from EmbeddedcCodeGenerator.

Definition at line 78 of file cgp_atmega.cpp.

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The documentation for this class was generated from the following files:

• cgp_atmega.h
• cgp_atmega.cpp