Marlin_Firmware/Marlin/fastio.h

/**
 * Marlin 3D Printer Firmware
 * Copyright (C) 2016 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/>.
 *
 */

/**
 * Fast I/O Routines
 * Use direct port manipulation to save scads of processor time.
 * Contributed by Triffid_Hunter. Modified by Kliment and the Marlin team.
 */

#ifndef _FASTIO_ARDUINO_H 
#define _FASTIO_ARDUINO_H

#include <avr/io.h>

/**
 * Enable this option to use Teensy++ 2.0 assignments for AT90USB processors.
 */
//#define AT90USBxx_TEENSYPP_ASSIGNMENTS

/**
 * Include Ports and Functions
 */
#if defined(__AVR_ATmega168__) || defined(__AVR_ATmega328__) || defined(__AVR_ATmega328P__)
  #include "fastio_168.h"
#elif defined(__AVR_ATmega644__) || defined(__AVR_ATmega644P__) || defined(__AVR_ATmega644PA__) || defined(__AVR_ATmega1284P__)
  #include "fastio_644.h"
#elif defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
  #include "fastio_1280.h"
#elif defined(__AVR_AT90USB1287__) || defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__)
  #ifdef AT90USBxx_TEENSYPP_ASSIGNMENTS
    #include "fastio_AT90USB-Teensy.h"
  #else
    #include "fastio_AT90USB-Marlin.h"
  #endif
#elif defined(__AVR_ATmega1281__) || defined(__AVR_ATmega2561__)
  #include "fastio_1281.h"
#else
  #error "Pins for this chip not defined in Arduino.h! If you have a working pins definition, please contribute!"
#endif

#ifndef _BV
  #define _BV(PIN) (1UL << PIN)
#endif

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

#define _READ(IO) ((bool)(DIO ## IO ## _RPORT & _BV(DIO ## IO ## _PIN)))

// On some boards pins > 0x100 are used. These are not converted to atomic actions. A critical section is needed.

#define _WRITE_NC(IO, v)  do { if (v) {DIO ##  IO ## _WPORT |= _BV(DIO ## IO ## _PIN); } else {DIO ##  IO ## _WPORT &= ~_BV(DIO ## IO ## _PIN); }; } while (0)

#define _WRITE_C(IO, v)   do { if (v) { \
                                         CRITICAL_SECTION_START; \
                                         {DIO ##  IO ## _WPORT |= _BV(DIO ## IO ## _PIN); } \
                                         CRITICAL_SECTION_END; \
                                       } \
                                       else { \
                                         CRITICAL_SECTION_START; \
                                         {DIO ##  IO ## _WPORT &= ~_BV(DIO ## IO ## _PIN); } \
                                         CRITICAL_SECTION_END; \
                                       } \
                                     } \
                                     while (0)

#define _WRITE(IO, v) do { if (&(DIO ## IO ## _RPORT) >= (uint8_t *)0x100) {_WRITE_C(IO, v); } else {_WRITE_NC(IO, v); }; } while (0)

#define _TOGGLE(IO) do {DIO ## IO ## _RPORT ^= _BV(DIO ## IO ## _PIN); } while (0)

#define _SET_INPUT(IO) do {DIO ## IO ## _DDR &= ~_BV(DIO ## IO ## _PIN); } while (0)
#define _SET_OUTPUT(IO) do {DIO ## IO ## _DDR |= _BV(DIO ## IO ## _PIN); } while (0)

#define _GET_INPUT(IO) ((DIO ## IO ## _DDR & _BV(DIO ## IO ## _PIN)) == 0)
#define _GET_OUTPUT(IO) ((DIO ## IO ## _DDR & _BV(DIO ## IO ## _PIN)) != 0)
#define _GET_TIMER(IO) (DIO ## IO ## _PWM)

#define READ(IO) _READ(IO)
#define WRITE(IO,V) _WRITE(IO,V)
#define TOGGLE(IO) _TOGGLE(IO)

#define SET_INPUT(IO) _SET_INPUT(IO)
#define SET_INPUT_PULLUP(IO) do{ _SET_INPUT(IO); _WRITE(IO, HIGH); }while(0)
#define SET_OUTPUT(IO) _SET_OUTPUT(IO)

#define GET_INPUT(IO) _GET_INPUT(IO)
#define GET_OUTPUT(IO) _GET_OUTPUT(IO)
#define GET_TIMER(IO) _GET_TIMER(IO)

#define OUT_WRITE(IO, v) do{ SET_OUTPUT(IO); WRITE(IO, v); }while(0)

/**
 * Timer and Interrupt Control
 */

// Waveform Generation Modes
typedef enum {
  WGM_NORMAL,          //  0
  WGM_PWM_PC_8,        //  1
  WGM_PWM_PC_9,        //  2
  WGM_PWM_PC_10,       //  3
  WGM_CTC_OCRnA,       //  4  COM OCnx
  WGM_FAST_PWM_8,      //  5
  WGM_FAST_PWM_9,      //  6
  WGM_FAST_PWM_10,     //  7
  WGM_PWM_PC_FC_ICRn,  //  8
  WGM_PWM_PC_FC_OCRnA, //  9  COM OCnA
  WGM_PWM_PC_ICRn,     // 10
  WGM_PWM_PC_OCRnA,    // 11  COM OCnA
  WGM_CTC_ICRn,        // 12  COM OCnx
  WGM_reserved,        // 13
  WGM_FAST_PWM_ICRn,   // 14  COM OCnA
  WGM_FAST_PWM_OCRnA   // 15  COM OCnA
} WaveGenMode;

// Compare Modes
typedef enum {
  COM_NORMAL,          //  0
  COM_TOGGLE,          //  1  Non-PWM: OCnx ... Both PWM (WGM 9,11,14,15): OCnA only ... else NORMAL
  COM_CLEAR_SET,       //  2  Non-PWM: OCnx ... Fast PWM: OCnx/Bottom ... PF-FC: OCnx Up/Down
  COM_SET_CLEAR        //  3  Non-PWM: OCnx ... Fast PWM: OCnx/Bottom ... PF-FC: OCnx Up/Down
} CompareMode;

// Clock Sources
typedef enum {
  CS_NONE,             //  0
  CS_PRESCALER_1,      //  1
  CS_PRESCALER_8,      //  2
  CS_PRESCALER_64,     //  3
  CS_PRESCALER_256,    //  4
  CS_PRESCALER_1024,   //  5
  CS_EXT_FALLING,      //  6
  CS_EXT_RISING        //  7
} ClockSource;

// Clock Sources (Timer 2 only)
typedef enum {
  CS2_NONE,            //  0
  CS2_PRESCALER_1,     //  1
  CS2_PRESCALER_8,     //  2
  CS2_PRESCALER_32,    //  3
  CS2_PRESCALER_64,    //  4
  CS2_PRESCALER_128,   //  5
  CS2_PRESCALER_256,   //  6
  CS2_PRESCALER_1024   //  7
} ClockSource2;

// Get interrupt bits in an orderly way
#define GET_WGM(T)   (((TCCR##T##A >> WGM##T##0) & 0x3) | ((TCCR##T##B >> WGM##T##2 << 2) & 0xC))
#define GET_CS(T)    ((TCCR##T##B >> CS##T##0) & 0x7)
#define GET_COM(T,Q) ((TCCR##T##Q >> COM##T##Q##0) & 0x3)
#define GET_COMA(T)  GET_COM(T,A)
#define GET_COMB(T)  GET_COM(T,B)
#define GET_COMC(T)  GET_COM(T,C)
#define GET_ICNC(T)  (!!(TCCR##T##B & _BV(ICNC##T)))
#define GET_ICES(T)  (!!(TCCR##T##B & _BV(ICES##T)))
#define GET_FOC(T,Q) (!!(TCCR##T##C & _BV(FOC##T##Q)))
#define GET_FOCA(T)  GET_FOC(T,A)
#define GET_FOCB(T)  GET_FOC(T,B)
#define GET_FOCC(T)  GET_FOC(T,C)

// Set Wave Generation Mode bits
#define _SET_WGM(T,V) do{ \
    TCCR##T##A = (TCCR##T##A & ~(0x3 << WGM##T##0)) | (( int(V)       & 0x3) << WGM##T##0); \
    TCCR##T##B = (TCCR##T##B & ~(0x3 << WGM##T##2)) | (((int(V) >> 2) & 0x3) << WGM##T##2); \
  }while(0)
#define SET_WGM(T,V) _SET_WGM(T,WGM_##V)

// Set Clock Select bits
#define _SET_CS(T,V) (TCCR##T##B = (TCCR##T##B & ~(0x7 << CS##T##0)) | ((int(V) & 0x7) << CS##T##0))
#define _SET_CS0(V) _SET_CS(0,V)
#define _SET_CS1(V) _SET_CS(1,V)
#ifdef TCCR2
  #define _SET_CS2(V) (TCCR2 = (TCCR2 & ~(0x7 << CS20)) | (int(V) << CS20))
#else
  #define _SET_CS2(V) _SET_CS(2,V)
#endif
#define _SET_CS3(V) _SET_CS(3,V)
#define _SET_CS4(V) _SET_CS(4,V)
#define _SET_CS5(V) _SET_CS(5,V)
#define SET_CS0(V) _SET_CS0(CS_##V)
#define SET_CS1(V) _SET_CS1(CS_##V)
#ifdef TCCR2
  #define SET_CS2(V) _SET_CS2(CS2_##V)
#else
  #define SET_CS2(V) _SET_CS2(CS_##V)
#endif
#define SET_CS3(V) _SET_CS3(CS_##V)
#define SET_CS4(V) _SET_CS4(CS_##V)
#define SET_CS5(V) _SET_CS5(CS_##V)
#define SET_CS(T,V) SET_CS##T(V)

// Set Compare Mode bits
#define _SET_COM(T,Q,V) (TCCR##T##Q = (TCCR##T##Q & ~(0x3 << COM##T##Q##0)) | (int(V) << COM##T##Q##0))
#define _SET_COMA(T,V) _SET_COM(T,A,V)
#define _SET_COMB(T,V) _SET_COM(T,B,V)
#define _SET_COMC(T,V) _SET_COM(T,C,V)
#define _SET_COMS(T,V1,V2,V3) do{ _SET_COMA(T,V1); _SET_COMB(T,V2); _SET_COMC(T,V3); }while(0)
#define SET_COM(T,Q,V) _SET_COM(T,Q,COM_##V)
#define SET_COMA(T,V) SET_COM(T,A,V)
#define SET_COMB(T,V) SET_COM(T,B,V)
#define SET_COMC(T,V) SET_COM(T,C,V)
#define SET_COMS(T,V1,V2,V3) do{ SET_COMA(T,V1); SET_COMB(T,V2); SET_COMC(T,V3); }while(0)

// Set Noise Canceler bit
#define SET_ICNC(T,V) (TCCR##T##B = (V) ? TCCR##T##B | _BV(ICNC##T) : TCCR##T##B & ~_BV(ICNC##T))

// Set Input Capture Edge Select bit
#define SET_ICES(T,V) (TCCR##T##B = (V) ? TCCR##T##B | _BV(ICES##T) : TCCR##T##B & ~_BV(ICES##T))

// Set Force Output Compare bit
#define SET_FOC(T,Q,V) (TCCR##T##C = (V) ? TCCR##T##C | _BV(FOC##T##Q) : TCCR##T##C & ~_BV(FOC##T##Q))
#define SET_FOCA(T,V) SET_FOC(T,A,V)
#define SET_FOCB(T,V) SET_FOC(T,B,V)
#define SET_FOCC(T,V) SET_FOC(T,C,V)

#endif // _FASTIO_ARDUINO_H