NAME

RPi::Const - Constant variables for embedded programming, including the RPi:: family of modules

SYNOPSIS

use RPi::Const (:all);

# or...

use RPi::Const (:pinmode);

# etc

DESCRIPTION

This module optionally exports selections or all constant variables used within the RPi::WiringPi suite.

CONSTANT EXPORT TAGS

These are the individual grouping of export tags. The :all tag includes all of the below.

:mode

Setup modes. This is what determines which pin numbering scheme you're using. See wiringPi setup modes for details.

RPI_MODE_WPI      =>  0, # wiringPi scheme
RPI_MODE_GPIO     =>  1, # GPIO scheme
RPI_MODE_GPIO_SYS =>  2, # GPIO scheme in SYS mode
RPI_MODE_PHYS     =>  3, # physical pin layout scheme
RPI_MODE_UNINIT   => -1, # setup not yet run

:pinmode

Pin modes.

INPUT            => 0,
OUTPUT           => 1,
PWM_OUT          => 2,
GPIO_CLOCK       => 3,
SOFT_PWM_OUTPUT  => 4,  # reserved
SOFT_TONE_OUTPUT => 5,  # reserved
PWM_TONE_OUTPUT  => 6,  # reserved

:altmode

Pin ALT modes.

ALT0 => 4,
ALT1 => 5,
ALT2 => 6,
ALT3 => 7,
ALT4 => 3,
ALT5 => 2,

:pull

Internal pin pull up/down resistor state.

PUD_OFF  => 0,
PUD_DOWN => 1,
PUD_UP   => 2,

:state

HIGH => 1,
LOW  => 0,
ON   => 1,
OFF  => 0,

:pwm_mode

The modes the PWM can be set to.

PWM_MODE_MS  => 0,
PWM_MODE_BAL => 1,

:pwm_defaults

Hardware defaults for PWM settings.

PWM_DEFAULT_MODE => 1, # balanced mode
PWM_DEFAULT_CLOCK => 32,
PWM_DEFAULT_RANGE => 1023

:interrupt

Edge detection states for interrupts.

EDGE_SETUP   => 0,  # reserved
EDGE_FALLING => 1,
EDGE_RISING  => 2,
EDGE_BOTH    => 3,

:mcp23017_registers

Hardware register locations and related info for the MCP23107 GPIO Expander

MCP23017_IODIRA     => 0x00,
MCP23017_IODIRB     => 0x01,
MCP23017_IPOLA      => 0x02,
MCP23017_IPOLB      => 0x03,
MCP23017_GPINTENA   => 0x04,
MCP23017_GPINTENB   => 0x05,
MCP23017_DEFVALA    => 0x06,
MCP23017_DEFVALB    => 0x07,
MCP23017_INTCONA    => 0x08,
MCP23017_INTCONB    => 0x09,
MCP23017_IOCONA     => 0x0A,
MCP23017_IOCONB     => 0x0B,
MCP23017_GPPUA      => 0x0C,
MCP23017_GPPUB      => 0x0D,
MCP23017_INTFA      => 0x0E,
MCP23017_INTFB      => 0x0F,
MCP23017_INTCAPA    => 0x10,
MCP23017_INTCAPB    => 0x11,
MCP23017_GPIOA      => 0x12,
MCP23017_GPIOB      => 0x13,
MCP23017_OLATA      => 0x14,
MCP23017_OLATB      => 0x15,

MCP23017_INPUT      => 1,
MCP23017_OUTPUT     => 0

:wpi_pin

The WPIPinType pin-numbering scheme passed to wiringPi's wiringPiSetupPinType() / wiringPiSetupGpioDevice() setup variants. Note that WPI_PIN_PHYS is intentionally not provided - physical-pin setup is not supported within the suite.

WPI_PIN_BCM => 1,
WPI_PIN_WPI => 2,

:int_edge

wiringPi-native names for the interrupt edge-detection triggers (these mirror wiringPi's own INT_EDGE_* #defines). Same values as the :interrupt (EDGE_*) tag.

INT_EDGE_SETUP   => 0,  # reserved
INT_EDGE_FALLING => 1,
INT_EDGE_RISING  => 2,
INT_EDGE_BOTH    => 3,

AUTHOR

Steve Bertrand, steveb@cpan.org

COPYRIGHT AND LICENSE

Copyright (C) 2016-2026 by Steve Bertrand

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.18.2 or, at your option, any later version of Perl 5 you may have available.