Initial commit

1 files changed, 746 insertions, 0 deletions

diff --git a/Marlin/src/libs/softspi.h b/Marlin/src/libs/softspi.h
new file mode 100644
index 0000000..5d48f9f
--- /dev/null
+++ b/Marlin/src/libs/softspi.h
@@ -0,0 +1,746 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 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 <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+//
+// Based on https://github.com/niteris/ArduinoSoftSpi
+//
+
+#include "../HAL/shared/Marduino.h"
+
+#ifndef FORCE_INLINE
+  #define FORCE_INLINE inline __attribute__((always_inline))
+#endif
+
+#define nop __asm__ volatile ("nop") // NOP for timing
+
+#ifdef __arm__
+
+  #ifdef CORE_TEENSY
+
+    /**
+     * Read pin value
+     * @param[in] pin Arduino pin number
+     * @return value read
+     */
+    FORCE_INLINE static bool fastDigitalRead(uint8_t pin) {
+      return *portInputRegister(pin);
+    }
+
+    /**
+     * Set pin value
+     * @param[in] pin Arduino pin number
+     * @param[in] level value to write
+     */
+    FORCE_INLINE static void fastDigitalWrite(uint8_t pin, bool value) {
+      if (value)
+        *portSetRegister(pin) = 1;
+      else
+        *portClearRegister(pin) = 1;
+    }
+
+  #else // !CORE_TEENSY
+
+    /**
+     * Read pin value
+     * @param[in] pin Arduino pin number
+     * @return value read
+     */
+    FORCE_INLINE static bool fastDigitalRead(uint8_t pin) {
+      return digitalRead(pin);
+    }
+
+    /**
+     * Set pin value
+     * @param[in] pin Arduino pin number
+     * @param[in] level value to write
+     */
+    FORCE_INLINE static void fastDigitalWrite(uint8_t pin, bool value) {
+      digitalWrite(pin, value);
+    }
+
+  #endif // !CORE_TEENSY
+
+  inline void fastDigitalToggle(uint8_t pin) { fastDigitalWrite(pin, !fastDigitalRead(pin)); }
+
+  inline void fastPinMode(uint8_t pin, bool mode) { pinMode(pin, mode); }
+
+#else  // !__arm__
+
+  #include <avr/io.h>
+  #include <util/atomic.h>
+
+  /**
+   * @class pin_map_t
+   * @brief struct for mapping digital pins
+   */
+  struct pin_map_t {
+    volatile uint8_t* ddr;   /**< address of DDR for this pin */
+    volatile uint8_t* pin;   /**< address of PIN for this pin */
+    volatile uint8_t* port;  /**< address of PORT for this pin */
+    uint8_t bit;             /**< bit number for this pin */
+  };
+
+  #if defined(__AVR_ATmega168__) || defined(__AVR_ATmega168P__) || defined(__AVR_ATmega328P__)
+
+    // 168 and 328 Arduinos
+    const static pin_map_t pinMap[] = {
+      {&DDRD, &PIND, &PORTD, 0},  // D0  0
+      {&DDRD, &PIND, &PORTD, 1},  // D1  1
+      {&DDRD, &PIND, &PORTD, 2},  // D2  2
+      {&DDRD, &PIND, &PORTD, 3},  // D3  3
+      {&DDRD, &PIND, &PORTD, 4},  // D4  4
+      {&DDRD, &PIND, &PORTD, 5},  // D5  5
+      {&DDRD, &PIND, &PORTD, 6},  // D6  6
+      {&DDRD, &PIND, &PORTD, 7},  // D7  7
+      {&DDRB, &PINB, &PORTB, 0},  // B0  8
+      {&DDRB, &PINB, &PORTB, 1},  // B1  9
+      {&DDRB, &PINB, &PORTB, 2},  // B2 10
+      {&DDRB, &PINB, &PORTB, 3},  // B3 11
+      {&DDRB, &PINB, &PORTB, 4},  // B4 12
+      {&DDRB, &PINB, &PORTB, 5},  // B5 13
+      {&DDRC, &PINC, &PORTC, 0},  // C0 14
+      {&DDRC, &PINC, &PORTC, 1},  // C1 15
+      {&DDRC, &PINC, &PORTC, 2},  // C2 16
+      {&DDRC, &PINC, &PORTC, 3},  // C3 17
+      {&DDRC, &PINC, &PORTC, 4},  // C4 18
+      {&DDRC, &PINC, &PORTC, 5}   // C5 19
+    };
+
+  #elif defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
+
+    // Mega
+    static const pin_map_t pinMap[] = {
+      {&DDRE, &PINE, &PORTE, 0},  // E0  0
+      {&DDRE, &PINE, &PORTE, 1},  // E1  1
+      {&DDRE, &PINE, &PORTE, 4},  // E4  2
+      {&DDRE, &PINE, &PORTE, 5},  // E5  3
+      {&DDRG, &PING, &PORTG, 5},  // G5  4
+      {&DDRE, &PINE, &PORTE, 3},  // E3  5
+      {&DDRH, &PINH, &PORTH, 3},  // H3  6
+      {&DDRH, &PINH, &PORTH, 4},  // H4  7
+      {&DDRH, &PINH, &PORTH, 5},  // H5  8
+      {&DDRH, &PINH, &PORTH, 6},  // H6  9
+      {&DDRB, &PINB, &PORTB, 4},  // B4 10
+      {&DDRB, &PINB, &PORTB, 5},  // B5 11
+      {&DDRB, &PINB, &PORTB, 6},  // B6 12
+      {&DDRB, &PINB, &PORTB, 7},  // B7 13
+      {&DDRJ, &PINJ, &PORTJ, 1},  // J1 14
+      {&DDRJ, &PINJ, &PORTJ, 0},  // J0 15
+      {&DDRH, &PINH, &PORTH, 1},  // H1 16
+      {&DDRH, &PINH, &PORTH, 0},  // H0 17
+      {&DDRD, &PIND, &PORTD, 3},  // D3 18
+      {&DDRD, &PIND, &PORTD, 2},  // D2 19
+      {&DDRD, &PIND, &PORTD, 1},  // D1 20
+      {&DDRD, &PIND, &PORTD, 0},  // D0 21
+      {&DDRA, &PINA, &PORTA, 0},  // A0 22
+      {&DDRA, &PINA, &PORTA, 1},  // A1 23
+      {&DDRA, &PINA, &PORTA, 2},  // A2 24
+      {&DDRA, &PINA, &PORTA, 3},  // A3 25
+      {&DDRA, &PINA, &PORTA, 4},  // A4 26
+      {&DDRA, &PINA, &PORTA, 5},  // A5 27
+      {&DDRA, &PINA, &PORTA, 6},  // A6 28
+      {&DDRA, &PINA, &PORTA, 7},  // A7 29
+      {&DDRC, &PINC, &PORTC, 7},  // C7 30
+      {&DDRC, &PINC, &PORTC, 6},  // C6 31
+      {&DDRC, &PINC, &PORTC, 5},  // C5 32
+      {&DDRC, &PINC, &PORTC, 4},  // C4 33
+      {&DDRC, &PINC, &PORTC, 3},  // C3 34
+      {&DDRC, &PINC, &PORTC, 2},  // C2 35
+      {&DDRC, &PINC, &PORTC, 1},  // C1 36
+      {&DDRC, &PINC, &PORTC, 0},  // C0 37
+      {&DDRD, &PIND, &PORTD, 7},  // D7 38
+      {&DDRG, &PING, &PORTG, 2},  // G2 39
+      {&DDRG, &PING, &PORTG, 1},  // G1 40
+      {&DDRG, &PING, &PORTG, 0},  // G0 41
+      {&DDRL, &PINL, &PORTL, 7},  // L7 42
+      {&DDRL, &PINL, &PORTL, 6},  // L6 43
+      {&DDRL, &PINL, &PORTL, 5},  // L5 44
+      {&DDRL, &PINL, &PORTL, 4},  // L4 45
+      {&DDRL, &PINL, &PORTL, 3},  // L3 46
+      {&DDRL, &PINL, &PORTL, 2},  // L2 47
+      {&DDRL, &PINL, &PORTL, 1},  // L1 48
+      {&DDRL, &PINL, &PORTL, 0},  // L0 49
+      {&DDRB, &PINB, &PORTB, 3},  // B3 50
+      {&DDRB, &PINB, &PORTB, 2},  // B2 51
+      {&DDRB, &PINB, &PORTB, 1},  // B1 52
+      {&DDRB, &PINB, &PORTB, 0},  // B0 53
+      {&DDRF, &PINF, &PORTF, 0},  // F0 54
+      {&DDRF, &PINF, &PORTF, 1},  // F1 55
+      {&DDRF, &PINF, &PORTF, 2},  // F2 56
+      {&DDRF, &PINF, &PORTF, 3},  // F3 57
+      {&DDRF, &PINF, &PORTF, 4},  // F4 58
+      {&DDRF, &PINF, &PORTF, 5},  // F5 59
+      {&DDRF, &PINF, &PORTF, 6},  // F6 60
+      {&DDRF, &PINF, &PORTF, 7},  // F7 61
+      {&DDRK, &PINK, &PORTK, 0},  // K0 62
+      {&DDRK, &PINK, &PORTK, 1},  // K1 63
+      {&DDRK, &PINK, &PORTK, 2},  // K2 64
+      {&DDRK, &PINK, &PORTK, 3},  // K3 65
+      {&DDRK, &PINK, &PORTK, 4},  // K4 66
+      {&DDRK, &PINK, &PORTK, 5},  // K5 67
+      {&DDRK, &PINK, &PORTK, 6},  // K6 68
+      {&DDRK, &PINK, &PORTK, 7},  // K7 69
+
+      // pins_MIGHTYBOARD_REVE.h
+      {&DDRG, &PING, &PORTG, 4},  // G4 70
+      {&DDRG, &PING, &PORTG, 3},  // G3 71
+      {&DDRJ, &PINJ, &PORTJ, 2},  // J2 72
+      {&DDRJ, &PINJ, &PORTJ, 3},  // J3 73
+      {&DDRJ, &PINJ, &PORTJ, 7},  // J7 74
+      {&DDRJ, &PINJ, &PORTJ, 4},  // J4 75
+      {&DDRJ, &PINJ, &PORTJ, 5},  // J5 76
+      {&DDRJ, &PINJ, &PORTJ, 6},  // J6 77
+      {&DDRE, &PINE, &PORTE, 2},  // E2 78
+      {&DDRE, &PINE, &PORTE, 6}   // E6 79
+    };
+
+  #elif defined(__AVR_ATmega1284P__) || defined(__AVR_ATmega1284__) \
+  || defined(__AVR_ATmega644P__) || defined(__AVR_ATmega644__) \
+  || defined(__AVR_ATmega64__) || defined(__AVR_ATmega32__) \
+  || defined(__AVR_ATmega324__) || defined(__AVR_ATmega16__)
+
+    #ifdef VARIANT_MIGHTY
+
+      // Mighty Layout
+      static const pin_map_t pinMap[] = {
+        {&DDRB, &PINB, &PORTB, 0},  // B0  0
+        {&DDRB, &PINB, &PORTB, 1},  // B1  1
+        {&DDRB, &PINB, &PORTB, 2},  // B2  2
+        {&DDRB, &PINB, &PORTB, 3},  // B3  3
+        {&DDRB, &PINB, &PORTB, 4},  // B4  4
+        {&DDRB, &PINB, &PORTB, 5},  // B5  5
+        {&DDRB, &PINB, &PORTB, 6},  // B6  6
+        {&DDRB, &PINB, &PORTB, 7},  // B7  7
+        {&DDRD, &PIND, &PORTD, 0},  // D0  8
+        {&DDRD, &PIND, &PORTD, 1},  // D1  9
+        {&DDRD, &PIND, &PORTD, 2},  // D2 10
+        {&DDRD, &PIND, &PORTD, 3},  // D3 11
+        {&DDRD, &PIND, &PORTD, 4},  // D4 12
+        {&DDRD, &PIND, &PORTD, 5},  // D5 13
+        {&DDRD, &PIND, &PORTD, 6},  // D6 14
+        {&DDRD, &PIND, &PORTD, 7},  // D7 15
+        {&DDRC, &PINC, &PORTC, 0},  // C0 16
+        {&DDRC, &PINC, &PORTC, 1},  // C1 17
+        {&DDRC, &PINC, &PORTC, 2},  // C2 18
+        {&DDRC, &PINC, &PORTC, 3},  // C3 19
+        {&DDRC, &PINC, &PORTC, 4},  // C4 20
+        {&DDRC, &PINC, &PORTC, 5},  // C5 21
+        {&DDRC, &PINC, &PORTC, 6},  // C6 22
+        {&DDRC, &PINC, &PORTC, 7},  // C7 23
+        {&DDRA, &PINA, &PORTA, 0},  // A0 24
+        {&DDRA, &PINA, &PORTA, 1},  // A1 25
+        {&DDRA, &PINA, &PORTA, 2},  // A2 26
+        {&DDRA, &PINA, &PORTA, 3},  // A3 27
+        {&DDRA, &PINA, &PORTA, 4},  // A4 28
+        {&DDRA, &PINA, &PORTA, 5},  // A5 29
+        {&DDRA, &PINA, &PORTA, 6},  // A6 30
+        {&DDRA, &PINA, &PORTA, 7}   // A7 31
+      };
+
+    #elif defined(VARIANT_BOBUINO)
+
+      // Bobuino Layout
+      static const pin_map_t pinMap[] = {
+        {&DDRD, &PIND, &PORTD, 0},  // D0  0
+        {&DDRD, &PIND, &PORTD, 1},  // D1  1
+        {&DDRD, &PIND, &PORTD, 2},  // D2  2
+        {&DDRD, &PIND, &PORTD, 3},  // D3  3
+        {&DDRB, &PINB, &PORTB, 0},  // B0  4
+        {&DDRB, &PINB, &PORTB, 1},  // B1  5
+        {&DDRB, &PINB, &PORTB, 2},  // B2  6
+        {&DDRB, &PINB, &PORTB, 3},  // B3  7
+        {&DDRD, &PIND, &PORTD, 5},  // D5  8
+        {&DDRD, &PIND, &PORTD, 6},  // D6  9
+        {&DDRB, &PINB, &PORTB, 4},  // B4 10
+        {&DDRB, &PINB, &PORTB, 5},  // B5 11
+        {&DDRB, &PINB, &PORTB, 6},  // B6 12
+        {&DDRB, &PINB, &PORTB, 7},  // B7 13
+        {&DDRA, &PINA, &PORTA, 7},  // A7 14
+        {&DDRA, &PINA, &PORTA, 6},  // A6 15
+        {&DDRA, &PINA, &PORTA, 5},  // A5 16
+        {&DDRA, &PINA, &PORTA, 4},  // A4 17
+        {&DDRA, &PINA, &PORTA, 3},  // A3 18
+        {&DDRA, &PINA, &PORTA, 2},  // A2 19
+        {&DDRA, &PINA, &PORTA, 1},  // A1 20
+        {&DDRA, &PINA, &PORTA, 0},  // A0 21
+        {&DDRC, &PINC, &PORTC, 0},  // C0 22
+        {&DDRC, &PINC, &PORTC, 1},  // C1 23
+        {&DDRC, &PINC, &PORTC, 2},  // C2 24
+        {&DDRC, &PINC, &PORTC, 3},  // C3 25
+        {&DDRC, &PINC, &PORTC, 4},  // C4 26
+        {&DDRC, &PINC, &PORTC, 5},  // C5 27
+        {&DDRC, &PINC, &PORTC, 6},  // C6 28
+        {&DDRC, &PINC, &PORTC, 7},  // C7 29
+        {&DDRD, &PIND, &PORTD, 4},  // D4 30
+        {&DDRD, &PIND, &PORTD, 7}   // D7 31
+      };
+
+    #elif defined(VARIANT_STANDARD)
+
+      // Standard Layout
+      static const pin_map_t pinMap[] = {
+        {&DDRB, &PINB, &PORTB, 0},  // B0  0
+        {&DDRB, &PINB, &PORTB, 1},  // B1  1
+        {&DDRB, &PINB, &PORTB, 2},  // B2  2
+        {&DDRB, &PINB, &PORTB, 3},  // B3  3
+        {&DDRB, &PINB, &PORTB, 4},  // B4  4
+        {&DDRB, &PINB, &PORTB, 5},  // B5  5
+        {&DDRB, &PINB, &PORTB, 6},  // B6  6
+        {&DDRB, &PINB, &PORTB, 7},  // B7  7
+        {&DDRD, &PIND, &PORTD, 0},  // D0  8
+        {&DDRD, &PIND, &PORTD, 1},  // D1  9
+        {&DDRD, &PIND, &PORTD, 2},  // D2 10
+        {&DDRD, &PIND, &PORTD, 3},  // D3 11
+        {&DDRD, &PIND, &PORTD, 4},  // D4 12
+        {&DDRD, &PIND, &PORTD, 5},  // D5 13
+        {&DDRD, &PIND, &PORTD, 6},  // D6 14
+        {&DDRD, &PIND, &PORTD, 7},  // D7 15
+        {&DDRC, &PINC, &PORTC, 0},  // C0 16
+        {&DDRC, &PINC, &PORTC, 1},  // C1 17
+        {&DDRC, &PINC, &PORTC, 2},  // C2 18
+        {&DDRC, &PINC, &PORTC, 3},  // C3 19
+        {&DDRC, &PINC, &PORTC, 4},  // C4 20
+        {&DDRC, &PINC, &PORTC, 5},  // C5 21
+        {&DDRC, &PINC, &PORTC, 6},  // C6 22
+        {&DDRC, &PINC, &PORTC, 7},  // C7 23
+        {&DDRA, &PINA, &PORTA, 7},  // A7 24
+        {&DDRA, &PINA, &PORTA, 6},  // A6 25
+        {&DDRA, &PINA, &PORTA, 5},  // A5 26
+        {&DDRA, &PINA, &PORTA, 4},  // A4 27
+        {&DDRA, &PINA, &PORTA, 3},  // A3 28
+        {&DDRA, &PINA, &PORTA, 2},  // A2 29
+        {&DDRA, &PINA, &PORTA, 1},  // A1 30
+        {&DDRA, &PINA, &PORTA, 0}   // A0 31
+      };
+
+    #else // !(VARIANT_MIGHTY || VARIANT_BOBUINO || VARIANT_STANDARD)
+
+      #error Undefined variant 1284, 644, 324, 64, 32
+
+    #endif
+
+  #elif defined(__AVR_ATmega32U4__)
+
+    #ifdef CORE_TEENSY
+
+      // Teensy 2.0
+      static const pin_map_t pinMap[] = {
+        {&DDRB, &PINB, &PORTB, 0},  // B0  0
+        {&DDRB, &PINB, &PORTB, 1},  // B1  1
+        {&DDRB, &PINB, &PORTB, 2},  // B2  2
+        {&DDRB, &PINB, &PORTB, 3},  // B3  3
+        {&DDRB, &PINB, &PORTB, 7},  // B7  4
+        {&DDRD, &PIND, &PORTD, 0},  // D0  5
+        {&DDRD, &PIND, &PORTD, 1},  // D1  6
+        {&DDRD, &PIND, &PORTD, 2},  // D2  7
+        {&DDRD, &PIND, &PORTD, 3},  // D3  8
+        {&DDRC, &PINC, &PORTC, 6},  // C6  9
+        {&DDRC, &PINC, &PORTC, 7},  // C7 10
+        {&DDRD, &PIND, &PORTD, 6},  // D6 11
+        {&DDRD, &PIND, &PORTD, 7},  // D7 12
+        {&DDRB, &PINB, &PORTB, 4},  // B4 13
+        {&DDRB, &PINB, &PORTB, 5},  // B5 14
+        {&DDRB, &PINB, &PORTB, 6},  // B6 15
+        {&DDRF, &PINF, &PORTF, 7},  // F7 16
+        {&DDRF, &PINF, &PORTF, 6},  // F6 17
+        {&DDRF, &PINF, &PORTF, 5},  // F5 18
+        {&DDRF, &PINF, &PORTF, 4},  // F4 19
+        {&DDRF, &PINF, &PORTF, 1},  // F1 20
+        {&DDRF, &PINF, &PORTF, 0},  // F0 21
+        {&DDRD, &PIND, &PORTD, 4},  // D4 22
+        {&DDRD, &PIND, &PORTD, 5},  // D5 23
+        {&DDRE, &PINE, &PORTE, 6}   // E6 24
+      };
+
+    #else // !CORE_TEENSY
+
+      // Leonardo
+      static const pin_map_t pinMap[] = {
+        {&DDRD, &PIND, &PORTD, 2},  // D2  0
+        {&DDRD, &PIND, &PORTD, 3},  // D3  1
+        {&DDRD, &PIND, &PORTD, 1},  // D1  2
+        {&DDRD, &PIND, &PORTD, 0},  // D0  3
+        {&DDRD, &PIND, &PORTD, 4},  // D4  4
+        {&DDRC, &PINC, &PORTC, 6},  // C6  5
+        {&DDRD, &PIND, &PORTD, 7},  // D7  6
+        {&DDRE, &PINE, &PORTE, 6},  // E6  7
+        {&DDRB, &PINB, &PORTB, 4},  // B4  8
+        {&DDRB, &PINB, &PORTB, 5},  // B5  9
+        {&DDRB, &PINB, &PORTB, 6},  // B6 10
+        {&DDRB, &PINB, &PORTB, 7},  // B7 11
+        {&DDRD, &PIND, &PORTD, 6},  // D6 12
+        {&DDRC, &PINC, &PORTC, 7},  // C7 13
+        {&DDRB, &PINB, &PORTB, 3},  // B3 14
+        {&DDRB, &PINB, &PORTB, 1},  // B1 15
+        {&DDRB, &PINB, &PORTB, 2},  // B2 16
+        {&DDRB, &PINB, &PORTB, 0},  // B0 17
+        {&DDRF, &PINF, &PORTF, 7},  // F7 18
+        {&DDRF, &PINF, &PORTF, 6},  // F6 19
+        {&DDRF, &PINF, &PORTF, 5},  // F5 20
+        {&DDRF, &PINF, &PORTF, 4},  // F4 21
+        {&DDRF, &PINF, &PORTF, 1},  // F1 22
+        {&DDRF, &PINF, &PORTF, 0},  // F0 23
+        {&DDRD, &PIND, &PORTD, 4},  // D4 24
+        {&DDRD, &PIND, &PORTD, 7},  // D7 25
+        {&DDRB, &PINB, &PORTB, 4},  // B4 26
+        {&DDRB, &PINB, &PORTB, 5},  // B5 27
+        {&DDRB, &PINB, &PORTB, 6},  // B6 28
+        {&DDRD, &PIND, &PORTD, 6}   // D6 29
+      };
+
+    #endif // !CORE_TEENSY
+
+  #elif defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB1286__)
+
+    // Teensy++ 1.0 & 2.0
+    static const pin_map_t pinMap[] = {
+      {&DDRD, &PIND, &PORTD, 0},  // D0  0
+      {&DDRD, &PIND, &PORTD, 1},  // D1  1
+      {&DDRD, &PIND, &PORTD, 2},  // D2  2
+      {&DDRD, &PIND, &PORTD, 3},  // D3  3
+      {&DDRD, &PIND, &PORTD, 4},  // D4  4
+      {&DDRD, &PIND, &PORTD, 5},  // D5  5
+      {&DDRD, &PIND, &PORTD, 6},  // D6  6
+      {&DDRD, &PIND, &PORTD, 7},  // D7  7
+      {&DDRE, &PINE, &PORTE, 0},  // E0  8
+      {&DDRE, &PINE, &PORTE, 1},  // E1  9
+      {&DDRC, &PINC, &PORTC, 0},  // C0 10
+      {&DDRC, &PINC, &PORTC, 1},  // C1 11
+      {&DDRC, &PINC, &PORTC, 2},  // C2 12
+      {&DDRC, &PINC, &PORTC, 3},  // C3 13
+      {&DDRC, &PINC, &PORTC, 4},  // C4 14
+      {&DDRC, &PINC, &PORTC, 5},  // C5 15
+      {&DDRC, &PINC, &PORTC, 6},  // C6 16
+      {&DDRC, &PINC, &PORTC, 7},  // C7 17
+      {&DDRE, &PINE, &PORTE, 6},  // E6 18
+      {&DDRE, &PINE, &PORTE, 7},  // E7 19
+      {&DDRB, &PINB, &PORTB, 0},  // B0 20
+      {&DDRB, &PINB, &PORTB, 1},  // B1 21
+      {&DDRB, &PINB, &PORTB, 2},  // B2 22
+      {&DDRB, &PINB, &PORTB, 3},  // B3 23
+      {&DDRB, &PINB, &PORTB, 4},  // B4 24
+      {&DDRB, &PINB, &PORTB, 5},  // B5 25
+      {&DDRB, &PINB, &PORTB, 6},  // B6 26
+      {&DDRB, &PINB, &PORTB, 7},  // B7 27
+      {&DDRA, &PINA, &PORTA, 0},  // A0 28
+      {&DDRA, &PINA, &PORTA, 1},  // A1 29
+      {&DDRA, &PINA, &PORTA, 2},  // A2 30
+      {&DDRA, &PINA, &PORTA, 3},  // A3 31
+      {&DDRA, &PINA, &PORTA, 4},  // A4 32
+      {&DDRA, &PINA, &PORTA, 5},  // A5 33
+      {&DDRA, &PINA, &PORTA, 6},  // A6 34
+      {&DDRA, &PINA, &PORTA, 7},  // A7 35
+      {&DDRE, &PINE, &PORTE, 4},  // E4 36
+      {&DDRE, &PINE, &PORTE, 5},  // E5 37
+      {&DDRF, &PINF, &PORTF, 0},  // F0 38
+      {&DDRF, &PINF, &PORTF, 1},  // F1 39
+      {&DDRF, &PINF, &PORTF, 2},  // F2 40
+      {&DDRF, &PINF, &PORTF, 3},  // F3 41
+      {&DDRF, &PINF, &PORTF, 4},  // F4 42
+      {&DDRF, &PINF, &PORTF, 5},  // F5 43
+      {&DDRF, &PINF, &PORTF, 6},  // F6 44
+      {&DDRF, &PINF, &PORTF, 7}   // F7 45
+    };
+
+  #else // CPU type
+
+    #error "Unknown CPU type for Software SPI"
+
+  #endif // CPU type
+
+  /** count of pins */
+  static constexpr uint8_t digitalPinCount = sizeof(pinMap) / sizeof(pin_map_t);
+
+  /** generate bad pin number error */
+  void badPinNumber()
+    __attribute__((error("Pin number is too large or not a constant")));
+
+  /**
+   * Check for valid pin number
+   * @param[in] pin Number of pin to be checked.
+   */
+  FORCE_INLINE static void badPinCheck(const uint8_t pin) {
+    if (!__builtin_constant_p(pin) || pin >= digitalPinCount) badPinNumber();
+  }
+
+  /**
+   * Fast write helper
+   * @param[in] address I/O register address
+   * @param[in] bit bit number to write
+   * @param[in] level value for bit
+   */
+  FORCE_INLINE static void fastBitWriteSafe(volatile uint8_t* address, uint8_t bit, bool level) {
+    uint8_t oldSREG;
+    if (address > (uint8_t*)0x5F) { oldSREG = SREG; cli(); }
+    if (level) SBI(*address, bit); else CBI(*address, bit);
+    if (address > (uint8_t*)0x5F) SREG = oldSREG;
+  }
+
+  /**
+   * Read pin value
+   * @param[in] pin Arduino pin number
+   * @return value read
+   */
+  FORCE_INLINE static bool fastDigitalRead(uint8_t pin) {
+    badPinCheck(pin);
+    return (*pinMap[pin].pin >> pinMap[pin].bit) & 1;
+  }
+
+  /**
+   * Toggle a pin
+   * @param[in] pin Arduino pin number
+   *
+   * If the pin is in output mode toggle the pin level.
+   * If the pin is in input mode toggle the state of the 20K pullup.
+   */
+  FORCE_INLINE static void fastDigitalToggle(uint8_t pin) {
+    badPinCheck(pin);
+    if (pinMap[pin].pin > (uint8_t*)0x5F)
+      *pinMap[pin].pin = _BV(pinMap[pin].bit);  // Must write bit to high address port
+    else
+      SBI(*pinMap[pin].pin, pinMap[pin].bit);   // Compiles to sbi and PIN register will not be read
+  }
+
+  /**
+   * Set pin value
+   * @param[in] pin Arduino pin number
+   * @param[in] level value to write
+   */
+  FORCE_INLINE static void fastDigitalWrite(uint8_t pin, bool level) {
+    badPinCheck(pin);
+    fastBitWriteSafe(pinMap[pin].port, pinMap[pin].bit, level);
+  }
+
+  /**
+   * Set pin mode
+   * @param[in] pin Arduino pin number
+   * @param[in] mode if true set output mode else input mode
+   *
+   * fastPinMode does not enable or disable the 20K pullup for input mode.
+   */
+  FORCE_INLINE static void fastPinMode(uint8_t pin, bool mode) {
+    badPinCheck(pin);
+    fastBitWriteSafe(pinMap[pin].ddr, pinMap[pin].bit, mode);
+  }
+
+#endif // !__arm__
+
+/**
+ * Set pin configuration
+ * @param[in] pin Arduino pin number
+ * @param[in] mode If true set output mode else input mode
+ * @param[in] level If mode is output, set level high/low.
+ *                  If mode is input, enable or disable the pin's 20K pullup.
+ */
+FORCE_INLINE static void fastPinConfig(uint8_t pin, bool mode, bool level) {
+  fastPinMode(pin, mode);
+  fastDigitalWrite(pin, level);
+}
+
+/**
+ * @class DigitalPin
+ * @brief Fast digital port I/O
+ */
+template<uint8_t PinNumber>
+class DigitalPin {
+public:
+
+  /** Constructor */
+  DigitalPin() {}
+
+  /**
+   * Constructor
+   * @param[in] pinMode if true set output mode else input mode.
+   */
+  explicit DigitalPin(bool pinMode) { mode(pinMode); }
+
+  /**
+   * Constructor
+   * @param[in] mode If true set output mode else input mode
+   * @param[in] level If mode is output, set level high/low.
+   *                  If mode is input, enable or disable the pin's 20K pullup.
+   */
+  DigitalPin(bool mode, bool level) { config(mode, level); }
+
+  /**
+   * Assignment operator
+   * @param[in] value If true set the pin's level high else set the
+   *  pin's level low.
+   *
+   * @return This DigitalPin instance.
+   */
+  FORCE_INLINE DigitalPin & operator = (bool value) { write(value); return *this; }
+
+  /**
+   * Parentheses operator
+   * @return Pin's level
+   */
+  FORCE_INLINE operator bool () const { return read(); }
+
+  /**
+   * Set pin configuration
+   * @param[in] mode If true set output mode else input mode
+   * @param[in] level If mode is output, set level high/low.
+   *                  If mode is input, enable or disable the pin's 20K pullup.
+   */
+  FORCE_INLINE void config(bool mode, bool level) { fastPinConfig(PinNumber, mode, level); }
+
+  /**
+   * Set pin level high if output mode or enable 20K pullup if input mode.
+   */
+  FORCE_INLINE void high() { write(true); }
+
+  /**
+   * Set pin level low if output mode or disable 20K pullup if input mode.
+   */
+  FORCE_INLINE void low() { write(false); }
+
+  /**
+   * Set pin mode
+   * @param[in] pinMode if true set output mode else input mode.
+   *
+   * mode() does not enable or disable the 20K pullup for input mode.
+   */
+  FORCE_INLINE void mode(bool pinMode) { fastPinMode(PinNumber, pinMode); }
+
+  /** @return Pin's level */
+  FORCE_INLINE bool read() const { return fastDigitalRead(PinNumber); }
+
+  /**
+   * Toggle a pin
+   * If the pin is in output mode toggle the pin's level.
+   * If the pin is in input mode toggle the state of the 20K pullup.
+   */
+  FORCE_INLINE void toggle() { fastDigitalToggle(PinNumber); }
+
+  /**
+   * Write the pin's level.
+   * @param[in] value If true set the pin's level high else set the
+   *  pin's level low.
+   */
+  FORCE_INLINE void write(bool value) { fastDigitalWrite(PinNumber, value); }
+};
+
+const bool MISO_MODE  = false,  // Pin Mode for MISO is input.
+           MISO_LEVEL = false,  // Pullups disabled for MISO are disabled.
+           MOSI_MODE  = true,   // Pin Mode for MOSI is output.
+           SCK_MODE   = true;   // Pin Mode for SCK is output.
+
+/**
+ * @class SoftSPI
+ * @brief Fast software SPI.
+ */
+template<uint8_t MisoPin, uint8_t MosiPin, uint8_t SckPin, uint8_t Mode = 0>
+class SoftSPI {
+ public:
+
+  /** Initialize SoftSPI pins. */
+  void begin() {
+    fastPinConfig(MisoPin, MISO_MODE, MISO_LEVEL);
+    fastPinConfig(MosiPin, MOSI_MODE, !MODE_CPHA(Mode));
+    fastPinConfig(SckPin, SCK_MODE, MODE_CPOL(Mode));
+  }
+
+  /**
+   * Soft SPI receive byte.
+   * @return Data byte received.
+   */
+  FORCE_INLINE uint8_t receive() {
+    uint8_t data = 0;
+    receiveBit(7, &data);
+    receiveBit(6, &data);
+    receiveBit(5, &data);
+    receiveBit(4, &data);
+    receiveBit(3, &data);
+    receiveBit(2, &data);
+    receiveBit(1, &data);
+    receiveBit(0, &data);
+    return data;
+  }
+
+  /**
+   * Soft SPI send byte.
+   * @param[in] data Data byte to send.
+   */
+  FORCE_INLINE void send(uint8_t data) {
+    sendBit(7, data);
+    sendBit(6, data);
+    sendBit(5, data);
+    sendBit(4, data);
+    sendBit(3, data);
+    sendBit(2, data);
+    sendBit(1, data);
+    sendBit(0, data);
+  }
+
+  /**
+   * Soft SPI transfer byte.
+   * @param[in] txData Data byte to send.
+   * @return Data byte received.
+   */
+  FORCE_INLINE uint8_t transfer(uint8_t txData) {
+    uint8_t rxData = 0;
+    transferBit(7, &rxData, txData);
+    transferBit(6, &rxData, txData);
+    transferBit(5, &rxData, txData);
+    transferBit(4, &rxData, txData);
+    transferBit(3, &rxData, txData);
+    transferBit(2, &rxData, txData);
+    transferBit(1, &rxData, txData);
+    transferBit(0, &rxData, txData);
+    return rxData;
+  }
+
+ private:
+
+  FORCE_INLINE bool MODE_CPHA(uint8_t mode) { return bool(mode & 1); }
+  FORCE_INLINE bool MODE_CPOL(uint8_t mode) { return bool(mode & 2); }
+  FORCE_INLINE void receiveBit(uint8_t bit, uint8_t* data) {
+    if (MODE_CPHA(Mode)) fastDigitalWrite(SckPin, !MODE_CPOL(Mode));
+    nop;
+    nop;
+    fastDigitalWrite(SckPin,
+      MODE_CPHA(Mode) ? MODE_CPOL(Mode) : !MODE_CPOL(Mode));
+    if (fastDigitalRead(MisoPin)) SBI(*data, bit);
+    if (!MODE_CPHA(Mode)) fastDigitalWrite(SckPin, MODE_CPOL(Mode));
+  }
+
+  FORCE_INLINE void sendBit(uint8_t bit, uint8_t data) {
+    if (MODE_CPHA(Mode)) fastDigitalWrite(SckPin, !MODE_CPOL(Mode));
+    fastDigitalWrite(MosiPin, data & _BV(bit));
+    fastDigitalWrite(SckPin, MODE_CPHA(Mode) ? MODE_CPOL(Mode) : !MODE_CPOL(Mode));
+    nop;
+    nop;
+    if (!MODE_CPHA(Mode)) fastDigitalWrite(SckPin, MODE_CPOL(Mode));
+  }
+
+  FORCE_INLINE void transferBit(uint8_t bit, uint8_t* rxData, uint8_t txData) {
+    if (MODE_CPHA(Mode)) fastDigitalWrite(SckPin, !MODE_CPOL(Mode));
+    fastDigitalWrite(MosiPin, txData & _BV(bit));
+    fastDigitalWrite(SckPin,
+      MODE_CPHA(Mode) ? MODE_CPOL(Mode) : !MODE_CPOL(Mode));
+    if (fastDigitalRead(MisoPin)) SBI(*rxData, bit);
+    if (!MODE_CPHA(Mode)) fastDigitalWrite(SckPin, MODE_CPOL(Mode));
+  }
+
+};