/Users/fmalpartida/development/ardWorkspace/LiquidCrystal_I2C/LiquiCrystal_I2C/FastIO.cpp

#include <WProgram.h>
#include <pins_arduino.h>
#include <inttypes.h>

Go to the source code of this file.

Defines
#define	ATOMIC_BLOCK(dummy)   if(true)
#define	ATOMIC_RESTORESTATE
#define	fio_digitalWrite_HIGH(reg, bit)   digitalWrite(bit,HIGH)
#define	fio_digitalWrite_LOW(reg, bit)   digitalWrite(bit,LOW)
#define	fio_digitalWrite_SWITCH(reg, bit)   digitalWrite(bit, !digitalRead(bit))
#define	fio_digitalWrite_SWITCHTO(reg, bit, val)   digitalWrite(bit,val);
#define	FIO_FALLBACK
#define	SKIP   0x23
Typedefs
typedef uint8_t	fio_bit
typedef uint8_t	fio_register
Functions
int	fio_digitalRead (fio_register pinRegister, fio_bit pinBit)
void	fio_digitalWrite (fio_register pinRegister, fio_bit pinBit, uint8_t value)
fio_bit	fio_pinToBit (uint8_t pin)
fio_register	fio_pinToInputRegister (uint8_t pin)
fio_register	fio_pinToOutputRegister (uint8_t pin, uint8_t initial_state=LOW)
void	fio_shiftOut (fio_register dataRegister, fio_bit dataBit, fio_register clockRegister, fio_bit clockBit)
void	fio_shiftOut (fio_register dataRegister, fio_bit dataBit, fio_register clockRegister, fio_bit clockBit, uint8_t value, uint8_t bitOrder)
void	fio_shiftOut1 (fio_register shift1Register, fio_bit shift1Bit, uint8_t value, boolean noLatch=false)
void	fio_shiftOut1 (uint8_t pin, uint8_t value, boolean noLatch=false)
void	fio_shiftOut1_init (fio_register shift1Register, fio_bit shift1Bit)
void	fio_shiftOut1_init (uint8_t pin)

---

Define Documentation

#define ATOMIC_BLOCK

(

dummy

)

if(true)

Definition at line 58 of file FastIO.h.

#define ATOMIC_RESTORESTATE

Definition at line 59 of file FastIO.h.

#define fio_digitalWrite_HIGH	(		reg,
			bit
	)		digitalWrite(bit,HIGH)

This is where the magic happens that makes things fast. Implemented as preprocessor directives to force inlining SWITCH is fast for FIO but probably slow for FIO_FALLBACK so SWITCHTO is recommended if the value is known.

Definition at line 143 of file FastIO.h.

#define fio_digitalWrite_LOW	(		reg,
			bit
	)		digitalWrite(bit,LOW)

Definition at line 144 of file FastIO.h.

#define fio_digitalWrite_SWITCH	(		reg,
			bit
	)		digitalWrite(bit, !digitalRead(bit))

Definition at line 145 of file FastIO.h.

#define fio_digitalWrite_SWITCHTO	(		reg,
			bit,
			val
	)		digitalWrite(bit,val);

Definition at line 146 of file FastIO.h.

#define FIO_FALLBACK

Definition at line 57 of file FastIO.h.

#define SKIP   0x23

Definition at line 42 of file FastIO.h.

---

Typedef Documentation

typedef uint8_t fio_bit

Definition at line 60 of file FastIO.h.

typedef uint8_t fio_register

Definition at line 61 of file FastIO.h.

---

Function Documentation

int fio_digitalRead	(	fio_register	pinRegister,
		fio_bit	pinBit
	)

direct digital read without any checks falls back to normal digitalRead if fast io is disabled

Parameters:

pinRegister[in]	Register – ignored if fast io is disabled
pinBit[in]	Bit – Pin if fast io is disabled

Returns:

Value read from pin

Definition at line 95 of file FastIO.cpp.

void fio_digitalWrite	(	fio_register	pinRegister,
		fio_bit	pinBit,
		uint8_t	value
	)

direct digital write without any checks falls back to normal digitalWrite if fast io is disabled

Parameters:

pinRegister[in]	Register – ignored if fast digital write is disabled
pinBit[in]	Bit – Pin if fast digital write is disabled
value[in]	desired output

Definition at line 76 of file FastIO.cpp.

fio_bit fio_pinToBit

(

uint8_t

pin

)

Find the bit which belongs to specified pin if fast digitalWrite is disabled this function returns the pin

Parameters:

pin[in]

Number of a digital pin

Returns:

Bit

Definition at line 65 of file FastIO.cpp.

fio_register fio_pinToInputRegister

(

uint8_t

pin

)

Get the input register for specified pin. if fast digital IO is disabled this function returns NULL

Parameters:

pin[in]

Number of a digital pin

Returns:

Register

Definition at line 52 of file FastIO.cpp.

fio_register fio_pinToOutputRegister	(	uint8_t	pin,
		uint8_t	initial_state = LOW
	)

Get the output register for specified pin. if fast digital IO is disabled this function returns NULL

Parameters:

pin[in]

Number of a digital pin

Returns:

Register

Definition at line 35 of file FastIO.cpp.

void fio_shiftOut	(	fio_register	dataRegister,
		fio_bit	dataBit,
		fio_register	clockRegister,
		fio_bit	clockBit
	)

faster shift out clear using fast digital write falls back to normal digitalWrite if fastio is disabled

Parameters:

dataRegister[in]	Register of data pin – ignored if fast digital write is disabled
dataBit[in]	Bit of data pin – Pin if fast digital write is disabled
clockRegister[in]	Register of data pin – ignored if fast digital write is disabled
clockBit[in]	Bit of data pin – Pin if fast digital write is disabled

Definition at line 159 of file FastIO.cpp.

void fio_shiftOut	(	fio_register	dataRegister,
		fio_bit	dataBit,
		fio_register	clockRegister,
		fio_bit	clockBit,
		uint8_t	value,
		uint8_t	bitOrder
	)

faster shift out using fast digital write falls back to normal digitalWrite if fastio is disabled

Parameters:

dataRegister[in]	Register of data pin – ignored if fast digital write is disabled
dataBit[in]	Bit of data pin – Pin if fast digital write is disabled
clockRegister[in]	Register of data pin – ignored if fast digital write is disabled
clockBit[in]	Bit of data pin – Pin if fast digital write is disabled
bitOrder[in]	bit order

Definition at line 108 of file FastIO.cpp.

void fio_shiftOut1	(	fio_register	shift1Register,
		fio_bit	shift1Bit,
		uint8_t	value,
		boolean	noLatch = false
	)

one wire shift out protocol needs initialisation (fio_shiftOut1_init)

Parameters:

shift1Register[in]	pins register
shift1Bit[in]	pins bit
value[in]	value to shift out, last byte is ignored and always shifted out LOW

Definition at line 190 of file FastIO.cpp.

void fio_shiftOut1	(	uint8_t	pin,
		uint8_t	value,
		boolean	noLatch = false
	)

one wire shift out protocol needs initialisation (fio_shiftOut1_init)

Parameters:

pin[in]	digital pin
value[in]	value to shift out, last byte is ignored and always shifted out LOW

Definition at line 264 of file FastIO.cpp.

void fio_shiftOut1_init	(	fio_register	shift1Register,
		fio_bit	shift1Bit
	)

initializes one wire shift out protocol Puts pin to HIGH state and delays until Capacitors are charged.

Parameters:

shift1Register[in]	pins register
shift1Bit[in]	pins bit

Definition at line 181 of file FastIO.cpp.

void fio_shiftOut1_init

(

uint8_t

pin

)

initializes one wire shift out protocol Puts pin to HIGH state and delays until Capacitors are charged.

Parameters:

pin[in]

digital pin

Definition at line 176 of file FastIO.cpp.