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+/* 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