qmk_firmware/platforms/avr/_pin_defs.h

/* Copyright 2021 QMK
 *
 * 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

#include <avr/io.h>

#define PORT_SHIFTER 4 // this may be 4 for all AVR chips

// If you want to add more to this list, reference the PINx definitions in these header
// files: https://github.com/vancegroup-mirrors/avr-libc/tree/master/avr-libc/include/avr

#if defined(__AVR_ATmega32U4__) || defined(__AVR_ATmega16U4__)
#    define ADDRESS_BASE 0x00
#    define PINB_ADDRESS 0x3
#    define PINC_ADDRESS 0x6
#    define PIND_ADDRESS 0x9
#    define PINE_ADDRESS 0xC
#    define PINF_ADDRESS 0xF
#elif defined(__AVR_AT90USB162__) || defined(__AVR_ATmega32U2__) || defined(__AVR_ATmega16U2__) || defined(__AVR_ATmega328P__) || defined(__AVR_ATmega328__)
#    define ADDRESS_BASE 0x00
#    define PINB_ADDRESS 0x3
#    define PINC_ADDRESS 0x6
#    define PIND_ADDRESS 0x9
#elif defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__) || defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__)
#    define ADDRESS_BASE 0x00
#    define PINA_ADDRESS 0x0
#    define PINB_ADDRESS 0x3
#    define PINC_ADDRESS 0x6
#    define PIND_ADDRESS 0x9
#    define PINE_ADDRESS 0xC
#    define PINF_ADDRESS 0xF
#elif defined(__AVR_ATmega32A__)
#    define ADDRESS_BASE 0x10
#    define PIND_ADDRESS 0x0
#    define PINC_ADDRESS 0x3
#    define PINB_ADDRESS 0x6
#    define PINA_ADDRESS 0x9
#elif defined(__AVR_ATtiny85__)
#    define ADDRESS_BASE 0x10
#    define PINB_ADDRESS 0x6
#else
#    error "Pins are not defined"
#endif

#define PINDEF(port, pin) ((PIN##port##_ADDRESS << PORT_SHIFTER) | pin)

#define _PIN_ADDRESS(p, offset) _SFR_IO8(ADDRESS_BASE + ((p) >> PORT_SHIFTER) + (offset))
// Port X Input Pins Address
#define PINx_ADDRESS(p) _PIN_ADDRESS(p, 0)
// Port X Data Direction Register,  0:input 1:output
#define DDRx_ADDRESS(p) _PIN_ADDRESS(p, 1)
// Port X Data Register
#define PORTx_ADDRESS(p) _PIN_ADDRESS(p, 2)

/* I/O pins */
#ifdef PORTA
#    define A0 PINDEF(A, 0)
#    define A1 PINDEF(A, 1)
#    define A2 PINDEF(A, 2)
#    define A3 PINDEF(A, 3)
#    define A4 PINDEF(A, 4)
#    define A5 PINDEF(A, 5)
#    define A6 PINDEF(A, 6)
#    define A7 PINDEF(A, 7)
#endif
#ifdef PORTB
#    define B0 PINDEF(B, 0)
#    define B1 PINDEF(B, 1)
#    define B2 PINDEF(B, 2)
#    define B3 PINDEF(B, 3)
#    define B4 PINDEF(B, 4)
#    define B5 PINDEF(B, 5)
#    define B6 PINDEF(B, 6)
#    define B7 PINDEF(B, 7)
#endif
#ifdef PORTC
#    define C0 PINDEF(C, 0)
#    define C1 PINDEF(C, 1)
#    define C2 PINDEF(C, 2)
#    define C3 PINDEF(C, 3)
#    define C4 PINDEF(C, 4)
#    define C5 PINDEF(C, 5)
#    define C6 PINDEF(C, 6)
#    define C7 PINDEF(C, 7)
#endif
#ifdef PORTD
#    define D0 PINDEF(D, 0)
#    define D1 PINDEF(D, 1)
#    define D2 PINDEF(D, 2)
#    define D3 PINDEF(D, 3)
#    define D4 PINDEF(D, 4)
#    define D5 PINDEF(D, 5)
#    define D6 PINDEF(D, 6)
#    define D7 PINDEF(D, 7)
#endif
#ifdef PORTE
#    define E0 PINDEF(E, 0)
#    define E1 PINDEF(E, 1)
#    define E2 PINDEF(E, 2)
#    define E3 PINDEF(E, 3)
#    define E4 PINDEF(E, 4)
#    define E5 PINDEF(E, 5)
#    define E6 PINDEF(E, 6)
#    define E7 PINDEF(E, 7)
#endif
#ifdef PORTF
#    define F0 PINDEF(F, 0)
#    define F1 PINDEF(F, 1)
#    define F2 PINDEF(F, 2)
#    define F3 PINDEF(F, 3)
#    define F4 PINDEF(F, 4)
#    define F5 PINDEF(F, 5)
#    define F6 PINDEF(F, 6)
#    define F7 PINDEF(F, 7)
#endif