Marlin_Firmware/Marlin/src/HAL/HAL_LINUX/fastio.h

/**
 * Marlin 3D Printer Firmware
 * Copyright (C) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
 *
 * Based on Sprinter and grbl.
 * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 *
 */
#pragma once

/**
 * Fast I/O Routines for X86_64
 */

#include <Arduino.h>
#include <pinmapping.h>

#define USEABLE_HARDWARE_PWM(pin) false

#define SET_DIR_INPUT(IO)     Gpio::setDir(IO, 1)
#define SET_DIR_OUTPUT(IO)    Gpio::setDir(IO, 0)

#define SET_MODE(IO, mode)    Gpio::setMode(IO, mode)

#define WRITE_PIN_SET(IO)     Gpio::set(IO)
#define WRITE_PIN_CLR(IO)     Gpio::clear(IO)

#define READ_PIN(IO)          Gpio::get(IO)
#define WRITE_PIN(IO,V)       Gpio::set(IO, V)

/**
 * Magic I/O routines
 *
 * Now you can simply SET_OUTPUT(STEP); WRITE(STEP, HIGH); WRITE(STEP, LOW);
 *
 * Why double up on these macros? see http://gcc.gnu.org/onlinedocs/cpp/Stringification.html
 */

/// Read a pin
#define _READ(IO)             READ_PIN(IO)

/// Write to a pin
#define _WRITE_VAR(IO,V)      digitalWrite(IO,V)

#define _WRITE(IO,V)          WRITE_PIN(IO,V)

/// toggle a pin
#define _TOGGLE(IO)          _WRITE(IO, !READ(IO))

/// set pin as input
#define _SET_INPUT(IO)        SET_DIR_INPUT(IO)

/// set pin as output
#define _SET_OUTPUT(IO)       SET_DIR_OUTPUT(IO)

/// set pin as input with pullup mode
#define _PULLUP(IO,V)         pinMode(IO, (V) ? INPUT_PULLUP : INPUT)

/// set pin as input with pulldown mode
#define _PULLDOWN(IO,V)       pinMode(IO, (V) ? INPUT_PULLDOWN : INPUT)

// hg42: all pins can be input or output (I hope)
// hg42: undefined pins create compile error (IO, is no pin)
// hg42: currently not used, but was used by pinsDebug

/// check if pin is an input
#define _GET_INPUT(IO)        (LPC1768_PIN_PIN(IO) >= 0)

/// check if pin is an output
#define _GET_OUTPUT(IO)       (LPC1768_PIN_PIN(IO) >= 0)

// hg42: GET_TIMER is used only to check if it's a PWM pin
// hg42: we cannot use USEABLE_HARDWARE_PWM because it uses a function that cannot be used statically
// hg42: instead use PWM bit from the #define

/// check if pin is a timer
#define _GET_TIMER(IO)        true  // could be LPC1768_PIN_PWM(IO), but there
// hg42: could be this:
// #define _GET_TIMER(IO)        LPC1768_PIN_PWM(IO)
// but this is an incomplete check (12 pins are PWMable, but only 6 can be used at the same time)

/// Read a pin wrapper
#define READ(IO)             _READ(IO)

/// Write to a pin wrapper
#define WRITE_VAR(IO,V)      _WRITE_VAR(IO,V)
#define WRITE(IO,V)          _WRITE(IO,V)

/// toggle a pin wrapper
#define TOGGLE(IO)           _TOGGLE(IO)

/// set pin as input wrapper
#define SET_INPUT(IO)        _SET_INPUT(IO)
/// set pin as input with pullup wrapper
#define SET_INPUT_PULLUP(IO)  do{ _SET_INPUT(IO); _PULLUP(IO, HIGH); }while(0)
/// set pin as input with pulldown wrapper
#define SET_INPUT_PULLDOWN(IO) do{ _SET_INPUT(IO); _PULLDOWN(IO, HIGH); }while(0)
/// set pin as output wrapper  -  reads the pin and sets the output to that value
#define SET_OUTPUT(IO)        do{ _WRITE(IO, _READ(IO)); _SET_OUTPUT(IO); }while(0)

/// check if pin is an input wrapper
#define GET_INPUT(IO)        _GET_INPUT(IO)
/// check if pin is an output wrapper
#define GET_OUTPUT(IO)       _GET_OUTPUT(IO)

/// check if pin is a timer (wrapper)
#define GET_TIMER(IO)        _GET_TIMER(IO)

// Shorthand
#define OUT_WRITE(IO,V)       do{ SET_OUTPUT(IO); WRITE(IO,V); }while(0)

// digitalRead/Write wrappers
#define extDigitalRead(IO)    digitalRead(IO)
#define extDigitalWrite(IO,V) digitalWrite(IO,V)