FastPin< PIN > Class Template Reference

Detailed Description

template<uint8_t PIN>
class FastPin< PIN >

The simplest level of Pin class.

This relies on runtime functions during initialization to get the port/pin mask for the pin. Most of the accesses involve references to these static globals that get set up. This won't be the fastest set of pin operations, but it will provide pin level access on pretty much all Arduino environments. In addition, it includes some methods to help optimize access in various ways. Namely, the versions of hi(), lo(), and fastset() that take the port register as a passed in register variable (saving a global dereference), since these functions are aggressively inlined, that can help collapse out a lot of extraneous memory loads/dereferences.

In addition, if, while writing a bunch of data to a pin, you know no other pins will be getting written to, you can get/cache a value of the pin's port register and use that to do a full set to the register. This results in one being able to simply do a store to the register, vs. the load, and/or, and store that would be done normally.

There are platform specific instantiations of this class that provide direct i/o register access to pins for much higher speed pin twiddling.

Note that these classes are all static functions. So the proper usage is Pin<13>::hi(); or such. Instantiating objects is not recommended, as passing Pin objects around will likely -not- have the effect you're expecting.

Examples

Pintest.ino.

Definition at line 205 of file fastpin.h.

#include <fastpin.h>

Inheritance diagram for FastPin< PIN >:

Public Types
typedef volatile RwReg *	port_ptr_t
	type for a pin read/write register, volatile
typedef RwReg	port_t
	type for a pin read/write register, non-volatile

Static Public Member Functions
static void	setOutput ()
	Set the pin mode as OUTPUT
static void	setInput ()
	Set the pin mode as INPUT
static void	hi ()
	Set the pin state to HIGH
static void	lo ()
	Set the pin state to LOW
static void	strobe ()
	Toggle the pin twice to create a short pulse.
static void	toggle ()
	Toggle the pin.
static void	hi (FASTLED_REGISTER port_ptr_t port)
	Set the same pin on another port to HIGH
static void	lo (FASTLED_REGISTER port_ptr_t port)
	Set the same pin on another port to LOW
static void	set (FASTLED_REGISTER port_t val)
	Set the state of the output register.
static void	fastset (FASTLED_REGISTER port_ptr_t port, FASTLED_REGISTER port_t val)
	Set the state of a port.
static port_t	hival ()
	Gets the state of the port with this pin HIGH
static port_t	loval ()
	Gets the state of the port with this pin LOW
static port_ptr_t	port ()
	Get the output state of the port.
static port_t	mask ()
	Get the pin mask.

Member Typedef Documentation

port_ptr_t

template<uint8_t PIN>

typedef volatile RwReg* FastPin< PIN >::port_ptr_t

type for a pin read/write register, volatile

Definition at line 218 of file fastpin.h.

port_t

template<uint8_t PIN>

typedef RwReg FastPin< PIN >::port_t

type for a pin read/write register, non-volatile

Definition at line 219 of file fastpin.h.

Member Function Documentation

fastset()

template<uint8_t PIN>

static void FastPin< PIN >::fastset ( FASTLED_REGISTER port_ptr_t port, FASTLED_REGISTER port_t val )

inlinestatic

Set the state of a port.

Parameters

port	the port to modify
val	the state to set the port to

Definition at line 245 of file fastpin.h.

hi() [1/2]

template<uint8_t PIN>

static void FastPin< PIN >::hi ( )

inlinestatic

Set the pin state to HIGH

Definition at line 227 of file fastpin.h.

hi() [2/2]

template<uint8_t PIN>

static void FastPin< PIN >::hi ( FASTLED_REGISTER port_ptr_t port )

inlinestatic

Set the same pin on another port to HIGH

Parameters

port	the port to modify

Definition at line 238 of file fastpin.h.

hival()

template<uint8_t PIN>

static port_t FastPin< PIN >::hival ( )

inlinestatic

Gets the state of the port with this pin HIGH

Definition at line 248 of file fastpin.h.

lo() [1/2]

template<uint8_t PIN>

static void FastPin< PIN >::lo ( )

inlinestatic

Set the pin state to LOW

Definition at line 229 of file fastpin.h.

lo() [2/2]

template<uint8_t PIN>

static void FastPin< PIN >::lo ( FASTLED_REGISTER port_ptr_t port )

inlinestatic

Set the same pin on another port to LOW

Parameters

port	the port to modify

Definition at line 240 of file fastpin.h.

loval()

template<uint8_t PIN>

static port_t FastPin< PIN >::loval ( )

inlinestatic

Gets the state of the port with this pin LOW

Definition at line 250 of file fastpin.h.

mask()

template<uint8_t PIN>

static port_t FastPin< PIN >::mask ( )

inlinestatic

Get the pin mask.

Definition at line 254 of file fastpin.h.

port()

template<uint8_t PIN>

static port_ptr_t FastPin< PIN >::port ( )

inlinestatic

Get the output state of the port.

Definition at line 252 of file fastpin.h.

set()

template<uint8_t PIN>

static void FastPin< PIN >::set ( FASTLED_REGISTER port_t val )

inlinestatic

Set the state of the output register.

Parameters

val	the state to set the output register to

Note

This function is not limited to the current pin! It modifies the entire register.

Definition at line 242 of file fastpin.h.

setInput()

template<uint8_t PIN>

static void FastPin< PIN >::setInput ( )

inlinestatic

Set the pin mode as INPUT

Definition at line 224 of file fastpin.h.

setOutput()

template<uint8_t PIN>

static void FastPin< PIN >::setOutput ( )

inlinestatic

Set the pin mode as OUTPUT

Definition at line 222 of file fastpin.h.

strobe()

template<uint8_t PIN>

static void FastPin< PIN >::strobe ( )

inlinestatic

Toggle the pin twice to create a short pulse.

Definition at line 232 of file fastpin.h.

toggle()

template<uint8_t PIN>

static void FastPin< PIN >::toggle ( )

inlinestatic

Toggle the pin.

If the pin was high, set it low. If was low, set it high.

Definition at line 235 of file fastpin.h.

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

• /home/runner/work/FastLED/FastLED/src/fastpin.h