first commit

libraries/GxEPD2/extras/sw_spi/README.MD

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+### support for SW SPI for GxEPD2
+
+GxEPD2 supports only HW SPI with the unmodified library.
+The replacement files in the src directory provide the option to use SW SPI.
+This is a workaround and not very elegant, therefore it is provided as a replacement only.
+
+To use SW SPI with GxEPD2:
+- copy the files GxEPD2_EPD.h and GxEPD2_EPD.cpp from the subdirectoy .src to the .src directory of the library.
+- add the special call to the added init method BEFORE the normal init method:
+  display.epd2.init(SW_SCK, SW_MOSI, 115200, true, 20, false); // define or replace SW_SCK, SW_MOSI
+  display.init(115200); // needed to init upper level
+  
+To use the modified library with HW SPI
+  - comment out the special init call:
+  //display.epd2.init(SW_SCK, SW_MOSI, 115200, true, 20, false); // define or replace SW_SCK, SW_MOSI
+  display.init(115200);
+
+To switch back to using HW SPI during run time
+  display.epd2.init(-1, -1, 115200, true, 20, false); // revert to HW SPI
+  display.init(115200); // needed to init upper level
+
+The SW SPI allows also to read through MOSI pin from DIN of e-paper controller
+  data = display.epd2._readData();
+  display.epd2._readData(data, n);

libraries/GxEPD2/extras/sw_spi/README.txt

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+### support for SW SPI for GxEPD2
+
+GxEPD2 supports only HW SPI with the unmodified library.
+The replacement files in the src directory provide the option to use SW SPI.
+This is a workaround and not very elegant, therefore it is provided as a replacement only.
+
+To use SW SPI with GxEPD2:
+- copy the files GxEPD2_EPD.h and GxEPD2_EPD.cpp from the subdirectoy .src to the .src directory of the library.
+- add the special call to the added init method BEFORE the normal init method:
+  display.epd2.init(SW_SCK, SW_MOSI, 115200, true, 20, false); // define or replace SW_SCK, SW_MOSI
+  display.init(115200); // needed to init upper level
+  
+To use the modified library with HW SPI
+  - comment out the special init call:
+  //display.epd2.init(SW_SCK, SW_MOSI, 115200, true, 20, false); // define or replace SW_SCK, SW_MOSI
+  display.init(115200);
+
+To switch back to using HW SPI during run time
+  display.epd2.init(-1, -1, 115200, true, 20, false); // revert to HW SPI
+  display.init(115200); // needed to init upper level
+
+The SW SPI allows also to read through MOSI pin from DIN of e-paper controller
+  data = display.epd2._readData();
+  display.epd2._readData(data, n);

libraries/GxEPD2/extras/sw_spi/src/GxEPD2_EPD.cpp

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+// Display Library for SPI e-paper panels from Dalian Good Display and boards from Waveshare.
+// Requires HW SPI and Adafruit_GFX. Caution: these e-papers require 3.3V supply AND data lines!
+//
+// based on Demo Example from Good Display: http://www.e-paper-display.com/download_list/downloadcategoryid=34&isMode=false.html
+//
+// Author: Jean-Marc Zingg
+//
+// Version: see library.properties
+//
+// Library: https://github.com/ZinggJM/GxEPD2
+//
+// This is a modified class GxEPD2_EPD that allows to use SW SPI with GxEPD2 and to read from DIN pin
+// read the README.MD or README.txr
+//
+// To use SW SPI with GxEPD2:
+// - copy the files GxEPD2_EPD.h and GxEPD2_EPD.cpp from the subdirectoy .src to the .src directory of the library.
+// - add the special call to the added init method BEFORE the normal init method:
+//   display.epd2.init(SW_SCK, SW_MOSI, 115200, true, 20, false); // define or replace SW_SCK, SW_MOSI
+//   display.init(115200); // needed to init upper level
+
+#include "GxEPD2_EPD.h"
+
+#if defined(ESP8266) || defined(ESP32)
+#include <pgmspace.h>
+#else
+#include <avr/pgmspace.h>
+#endif
+
+GxEPD2_EPD::GxEPD2_EPD(int16_t cs, int16_t dc, int16_t rst, int16_t busy, int16_t busy_level, uint32_t busy_timeout,
+                       uint16_t w, uint16_t h, GxEPD2::Panel p, bool c, bool pu, bool fpu) :
+  WIDTH(w), HEIGHT(h), panel(p), hasColor(c), hasPartialUpdate(pu), hasFastPartialUpdate(fpu),
+  _sck(-1), _mosi(-1),
+  _cs(cs), _dc(dc), _rst(rst), _busy(busy), _busy_level(busy_level), _busy_timeout(busy_timeout), _diag_enabled(false),
+  _spi_settings(4000000, MSBFIRST, SPI_MODE0)
+{
+  _initial_write = true;
+  _initial_refresh = true;
+  _power_is_on = false;
+  _using_partial_mode = false;
+  _hibernating = false;
+  _init_display_done = false;
+  _reset_duration = 20;
+}
+
+void GxEPD2_EPD::init(uint32_t serial_diag_bitrate)
+{
+  init(serial_diag_bitrate, true, 20, false);
+}
+
+void GxEPD2_EPD::init(uint32_t serial_diag_bitrate, bool initial, uint16_t reset_duration, bool pulldown_rst_mode)
+{
+  _initial_write = initial;
+  _initial_refresh = initial;
+  _pulldown_rst_mode = pulldown_rst_mode;
+  _power_is_on = false;
+  _using_partial_mode = false;
+  _hibernating = false;
+  _init_display_done = false;
+  _reset_duration = reset_duration;
+  if (serial_diag_bitrate > 0)
+  {
+    Serial.begin(serial_diag_bitrate);
+    _diag_enabled = true;
+  }
+  if (_cs >= 0)
+  {
+    digitalWrite(_cs, HIGH);
+    pinMode(_cs, OUTPUT);
+  }
+  if (_dc >= 0)
+  {
+    digitalWrite(_dc, HIGH);
+    pinMode(_dc, OUTPUT);
+  }
+  _reset();
+  if (_busy >= 0)
+  {
+    pinMode(_busy, INPUT);
+  }
+  if (_sck < 0) SPI.begin();
+}
+
+void GxEPD2_EPD::init(int16_t sck, int16_t mosi, uint32_t serial_diag_bitrate, bool initial, uint16_t reset_duration, bool pulldown_rst_mode)
+{
+  if ((sck >= 0) && (mosi >= 0))
+  {
+    _sck = sck;
+    _mosi = mosi;
+    digitalWrite(_sck, LOW);
+    digitalWrite(_mosi, LOW);
+    pinMode(_sck, OUTPUT);
+    pinMode(_mosi, OUTPUT);
+  } else _sck = -1;
+  init(serial_diag_bitrate, initial, reset_duration, pulldown_rst_mode);
+}
+
+void GxEPD2_EPD::end()
+{
+  pinMode(_sck, INPUT);
+  pinMode(_mosi, INPUT);
+  if (_cs >= 0) pinMode(_cs, INPUT);
+  if (_dc >= 0) pinMode(_dc, INPUT);
+  if (_rst >= 0) pinMode(_rst, INPUT);
+}
+
+void GxEPD2_EPD::_reset()
+{
+  if (_rst >= 0)
+  {
+    if (_pulldown_rst_mode)
+    {
+      digitalWrite(_rst, LOW);
+      pinMode(_rst, OUTPUT);
+      delay(_reset_duration);
+      pinMode(_rst, INPUT_PULLUP);
+      delay(200);
+    }
+    else
+    {
+      digitalWrite(_rst, HIGH);
+      pinMode(_rst, OUTPUT);
+      delay(20);
+      digitalWrite(_rst, LOW);
+      delay(_reset_duration);
+      digitalWrite(_rst, HIGH);
+      delay(200);
+    }
+    _hibernating = false;
+  }
+}
+
+void GxEPD2_EPD::_waitWhileBusy(const char* comment, uint16_t busy_time)
+{
+  if (_busy >= 0)
+  {
+    delay(1); // add some margin to become active
+    unsigned long start = micros();
+    while (1)
+    {
+      if (digitalRead(_busy) != _busy_level) break;
+      delay(1);
+      if (micros() - start > _busy_timeout)
+      {
+        Serial.println("Busy Timeout!");
+        break;
+      }
+    }
+    if (comment)
+    {
+#if !defined(DISABLE_DIAGNOSTIC_OUTPUT)
+      if (_diag_enabled)
+      {
+        unsigned long elapsed = micros() - start;
+        Serial.print(comment);
+        Serial.print(" : ");
+        Serial.println(elapsed);
+      }
+#endif
+    }
+    (void) start;
+  }
+  else delay(busy_time);
+}
+
+void GxEPD2_EPD::_writeCommand(uint8_t c)
+{
+  _beginTransaction(_spi_settings);
+  if (_dc >= 0) digitalWrite(_dc, LOW);
+  if (_cs >= 0) digitalWrite(_cs, LOW);
+  _spi_write(c);
+  if (_cs >= 0) digitalWrite(_cs, HIGH);
+  if (_dc >= 0) digitalWrite(_dc, HIGH);
+  _endTransaction();
+}
+
+void GxEPD2_EPD::_writeData(uint8_t d)
+{
+  _beginTransaction(_spi_settings);
+  if (_cs >= 0) digitalWrite(_cs, LOW);
+  _spi_write(d);
+  if (_cs >= 0) digitalWrite(_cs, HIGH);
+  _endTransaction();
+}
+
+void GxEPD2_EPD::_writeData(const uint8_t* data, uint16_t n)
+{
+  _beginTransaction(_spi_settings);
+  if (_cs >= 0) digitalWrite(_cs, LOW);
+  for (uint8_t i = 0; i < n; i++)
+  {
+    _spi_write(*data++);
+  }
+  if (_cs >= 0) digitalWrite(_cs, HIGH);
+  _endTransaction();
+}
+
+void GxEPD2_EPD::_writeDataPGM(const uint8_t* data, uint16_t n, int16_t fill_with_zeroes)
+{
+  _beginTransaction(_spi_settings);
+  if (_cs >= 0) digitalWrite(_cs, LOW);
+  for (uint8_t i = 0; i < n; i++)
+  {
+    _spi_write(pgm_read_byte(&*data++));
+  }
+  while (fill_with_zeroes > 0)
+  {
+    _spi_write(0x00);
+    fill_with_zeroes--;
+  }
+  if (_cs >= 0) digitalWrite(_cs, HIGH);
+  _endTransaction();
+}
+
+void GxEPD2_EPD::_writeDataPGM_sCS(const uint8_t* data, uint16_t n, int16_t fill_with_zeroes)
+{
+  _beginTransaction(_spi_settings);
+  for (uint8_t i = 0; i < n; i++)
+  {
+    if (_cs >= 0) digitalWrite(_cs, LOW);
+    _spi_write(pgm_read_byte(&*data++));
+    if (_cs >= 0) digitalWrite(_cs, HIGH);
+  }
+  while (fill_with_zeroes > 0)
+  {
+    if (_cs >= 0) digitalWrite(_cs, LOW);
+    _spi_write(0x00);
+    fill_with_zeroes--;
+    if (_cs >= 0) digitalWrite(_cs, HIGH);
+  }
+  _endTransaction();
+}
+
+void GxEPD2_EPD::_writeCommandData(const uint8_t* pCommandData, uint8_t datalen)
+{
+  _beginTransaction(_spi_settings);
+  if (_dc >= 0) digitalWrite(_dc, LOW);
+  if (_cs >= 0) digitalWrite(_cs, LOW);
+  _spi_write(*pCommandData++);
+  if (_dc >= 0) digitalWrite(_dc, HIGH);
+  for (uint8_t i = 0; i < datalen - 1; i++)  // sub the command
+  {
+    _spi_write(*pCommandData++);
+  }
+  if (_cs >= 0) digitalWrite(_cs, HIGH);
+  _endTransaction();
+}
+
+void GxEPD2_EPD::_writeCommandDataPGM(const uint8_t* pCommandData, uint8_t datalen)
+{
+  _beginTransaction(_spi_settings);
+  if (_dc >= 0) digitalWrite(_dc, LOW);
+  if (_cs >= 0) digitalWrite(_cs, LOW);
+  _spi_write(pgm_read_byte(&*pCommandData++));
+  if (_dc >= 0) digitalWrite(_dc, HIGH);
+  for (uint8_t i = 0; i < datalen - 1; i++)  // sub the command
+  {
+    _spi_write(pgm_read_byte(&*pCommandData++));
+  }
+  if (_cs >= 0) digitalWrite(_cs, HIGH);
+  _endTransaction();
+}
+
+void GxEPD2_EPD::_startTransfer()
+{
+  _beginTransaction(_spi_settings);
+  if (_cs >= 0) digitalWrite(_cs, LOW);
+}
+
+void GxEPD2_EPD::_transfer(uint8_t value)
+{
+  _spi_write(value);
+}
+
+void GxEPD2_EPD::_endTransfer()
+{
+  if (_cs >= 0) digitalWrite(_cs, HIGH);
+  _endTransaction();
+}
+
+void GxEPD2_EPD::_beginTransaction(const SPISettings& settings)
+{
+  if (_sck < 0) SPI.beginTransaction(settings);
+}
+
+void GxEPD2_EPD::_spi_write(uint8_t data)
+{
+  if (_sck < 0) SPI.transfer(data);
+  else
+  {
+#if defined (ESP8266)
+    yield();
+#endif
+    for (int i = 0; i < 8; i++)
+    {
+      digitalWrite(_mosi, (data & 0x80) ? HIGH : LOW);
+      data <<= 1;
+      digitalWrite(_sck, HIGH);
+      digitalWrite(_sck, LOW);
+    }
+  }
+}
+
+void GxEPD2_EPD::_endTransaction()
+{
+  if (_sck < 0) SPI.endTransaction();
+}
+
+uint8_t GxEPD2_EPD::_readData()
+{
+  uint8_t data = 0;
+  _beginTransaction(_spi_settings);
+  if (_cs >= 0) digitalWrite(_cs, LOW);
+  if (_sck < 0)
+  {
+    data = SPI.transfer(0);
+  }
+  else
+  {
+    pinMode(_mosi, INPUT);
+    for (int i = 0; i < 8; i++)
+    {
+      data <<= 1;
+      digitalWrite(_sck, HIGH);
+      data |= digitalRead(_mosi);
+      digitalWrite(_sck, LOW);
+    }
+    pinMode(_mosi, OUTPUT);
+  }
+  if (_cs >= 0) digitalWrite(_cs, HIGH);
+  _endTransaction();
+  return data;
+}
+
+void GxEPD2_EPD::_readData(uint8_t* data, uint16_t n)
+{
+  _beginTransaction(_spi_settings);
+  if (_cs >= 0) digitalWrite(_cs, LOW);
+  if (_sck < 0)
+  {
+    for (uint8_t i = 0; i < n; i++)
+    {
+      *data++ = SPI.transfer(0);
+    }
+  }
+  else
+  {
+    pinMode(_mosi, INPUT);
+    for (uint8_t i = 0; i < n; i++)
+    {
+      *data = 0;
+      for (int i = 0; i < 8; i++)
+      {
+        *data <<= 1;
+        digitalWrite(_sck, HIGH);
+        *data |= digitalRead(_mosi);
+        digitalWrite(_sck, LOW);
+      }
+      data++;
+    }
+    pinMode(_mosi, OUTPUT);
+  }
+  if (_cs >= 0) digitalWrite(_cs, HIGH);
+  _endTransaction();
+}

libraries/GxEPD2/extras/sw_spi/src/GxEPD2_EPD.h

@@ -0,0 +1,137 @@
+// Display Library for SPI e-paper panels from Dalian Good Display and boards from Waveshare.
+// Requires HW SPI and Adafruit_GFX. Caution: these e-papers require 3.3V supply AND data lines!
+//
+// based on Demo Example from Good Display: http://www.e-paper-display.com/download_list/downloadcategoryid=34&isMode=false.html
+//
+// Author: Jean-Marc Zingg
+//
+// Version: see library.properties
+//
+// Library: https://github.com/ZinggJM/GxEPD2
+//
+// This is a modified class GxEPD2_EPD that allows to use SW SPI with GxEPD2 and to read from DIN pin
+// read the README.MD or README.txt
+//
+// To use SW SPI with GxEPD2:
+// - copy the files GxEPD2_EPD.h and GxEPD2_EPD.cpp from the subdirectoy .src to the .src directory of the library.
+// - add the special call to the added init method BEFORE the normal init method:
+//   display.epd2.init(SW_SCK, SW_MOSI, 115200, true, 20, false); // define or replace SW_SCK, SW_MOSI
+//   display.init(115200); // needed to init upper level
+
+
+#ifndef _GxEPD2_EPD_H_
+#define _GxEPD2_EPD_H_
+
+#include <Arduino.h>
+#include <SPI.h>
+
+#include <GxEPD2.h>
+
+#pragma GCC diagnostic ignored "-Wunused-parameter"
+
+class GxEPD2_EPD
+{
+  public:
+    // attributes
+    const uint16_t WIDTH;
+    const uint16_t HEIGHT;
+    const GxEPD2::Panel panel;
+    const bool hasColor;
+    const bool hasPartialUpdate;
+    const bool hasFastPartialUpdate;
+    // constructor
+    GxEPD2_EPD(int16_t cs, int16_t dc, int16_t rst, int16_t busy, int16_t busy_level, uint32_t busy_timeout,
+               uint16_t w, uint16_t h, GxEPD2::Panel p, bool c, bool pu, bool fpu);
+    virtual void init(uint32_t serial_diag_bitrate = 0); // serial_diag_bitrate = 0 : disabled
+    virtual void init(uint32_t serial_diag_bitrate, bool initial, uint16_t reset_duration = 20, bool pulldown_rst_mode = false);
+    virtual void init(int16_t sck, int16_t mosi, uint32_t serial_diag_bitrate, bool initial, uint16_t reset_duration = 20, bool pulldown_rst_mode = false);
+    virtual void end(); // release SPI and control pins
+    //  Support for Bitmaps (Sprites) to Controller Buffer and to Screen
+    virtual void clearScreen(uint8_t value) = 0; // init controller memory and screen (default white)
+    virtual void writeScreenBuffer(uint8_t value) = 0; // init controller memory (default white)
+    // write to controller memory, without screen refresh; x and w should be multiple of 8
+    virtual void writeImage(const uint8_t bitmap[], int16_t x, int16_t y, int16_t w, int16_t h, bool invert = false, bool mirror_y = false, bool pgm = false) = 0;
+    virtual void writeImageForFullRefresh(const uint8_t bitmap[], int16_t x, int16_t y, int16_t w, int16_t h, bool invert = false, bool mirror_y = false, bool pgm = false)
+    {
+      // writeImage is independent from refresh mode for most controllers, exception e.g. SSD1681
+      writeImage(bitmap, x, y, w, h, invert, mirror_y, pgm);
+    }
+    virtual void writeImagePart(const uint8_t bitmap[], int16_t x_part, int16_t y_part, int16_t w_bitmap, int16_t h_bitmap,
+                                int16_t x, int16_t y, int16_t w, int16_t h, bool invert = false, bool mirror_y = false, bool pgm = false) = 0;
+    //    virtual void writeImage(const uint8_t* black, const uint8_t* color, int16_t x, int16_t y, int16_t w, int16_t h, bool invert = false, bool mirror_y = false, bool pgm = false) = 0;
+    //    virtual void writeImagePart(const uint8_t* black, const uint8_t* color, int16_t x_part, int16_t y_part, int16_t w_bitmap, int16_t h_bitmap,
+    //                                int16_t x, int16_t y, int16_t w, int16_t h, bool invert = false, bool mirror_y = false, bool pgm = false) = 0;
+    // write sprite of native data to controller memory, without screen refresh; x and w should be multiple of 8
+    //    virtual void writeNative(const uint8_t* data1, const uint8_t* data2, int16_t x, int16_t y, int16_t w, int16_t h, bool invert = false, bool mirror_y = false, bool pgm = false) = 0;
+    // for differential update: set current and previous buffers equal (for fast partial update to work correctly)
+    virtual void writeScreenBufferAgain(uint8_t value = 0xFF) // init controller memory (default white)
+    {
+      // most controllers with differential update do switch buffers on refresh, can use:
+      writeScreenBuffer(value);
+    }
+    virtual void writeImageAgain(const uint8_t bitmap[], int16_t x, int16_t y, int16_t w, int16_t h, bool invert = false, bool mirror_y = false, bool pgm = false)
+    {
+      // most controllers with differential update do switch buffers on refresh, can use:
+      writeImage(bitmap, x, y, w, h, invert, mirror_y, pgm);
+    }
+    virtual void writeImagePartAgain(const uint8_t bitmap[], int16_t x_part, int16_t y_part, int16_t w_bitmap, int16_t h_bitmap,
+                                     int16_t x, int16_t y, int16_t w, int16_t h, bool invert = false, bool mirror_y = false, bool pgm = false)
+    {
+      // most controllers with differential update do switch buffers on refresh, can use:
+      writeImagePart(bitmap, x_part, y_part, w_bitmap, h_bitmap, x, y, w, h, invert, mirror_y, pgm);
+    }
+    // write to controller memory, with screen refresh; x and w should be multiple of 8
+    //    virtual void drawImage(const uint8_t bitmap[], int16_t x, int16_t y, int16_t w, int16_t h, bool invert = false, bool mirror_y = false, bool pgm = false) = 0;
+    //    virtual void drawImagePart(const uint8_t bitmap[], int16_t x_part, int16_t y_part, int16_t w_bitmap, int16_t h_bitmap,
+    //                               int16_t x, int16_t y, int16_t w, int16_t h, bool invert = false, bool mirror_y = false, bool pgm = false) = 0;
+    //    virtual void drawImage(const uint8_t* black, const uint8_t* color, int16_t x, int16_t y, int16_t w, int16_t h, bool invert = false, bool mirror_y = false, bool pgm = false) = 0;
+    //    virtual void drawImagePart(const uint8_t* black, const uint8_t* color, int16_t x_part, int16_t y_part, int16_t w_bitmap, int16_t h_bitmap,
+    //                               int16_t x, int16_t y, int16_t w, int16_t h, bool invert = false, bool mirror_y = false, bool pgm = false) = 0;
+    // write sprite of native data to controller memory, with screen refresh; x and w should be multiple of 8
+    //    virtual void drawNative(const uint8_t* data1, const uint8_t* data2, int16_t x, int16_t y, int16_t w, int16_t h, bool invert = false, bool mirror_y = false, bool pgm = false) = 0;
+    virtual void refresh(bool partial_update_mode = false) = 0; // screen refresh from controller memory to full screen
+    virtual void refresh(int16_t x, int16_t y, int16_t w, int16_t h) = 0; // screen refresh from controller memory, partial screen
+    virtual void powerOff() = 0; // turns off generation of panel driving voltages, avoids screen fading over time
+    virtual void hibernate() = 0; // turns powerOff() and sets controller to deep sleep for minimum power use, ONLY if wakeable by RST (rst >= 0)
+    virtual void setPaged() {}; // for GxEPD2_154c paged workaround
+    static inline uint16_t gx_uint16_min(uint16_t a, uint16_t b)
+    {
+      return (a < b ? a : b);
+    };
+    static inline uint16_t gx_uint16_max(uint16_t a, uint16_t b)
+    {
+      return (a > b ? a : b);
+    };
+    void selectSPI(SPIClass& spi, SPISettings spi_settings){};
+  protected:
+    void _reset();
+    void _writeDataPGM(const uint8_t* data, uint16_t n, int16_t fill_with_zeroes = 0);
+    void _writeDataPGM_sCS(const uint8_t* data, uint16_t n, int16_t fill_with_zeroes = 0);
+    void _writeCommandData(const uint8_t* pCommandData, uint8_t datalen);
+    void _writeCommandDataPGM(const uint8_t* pCommandData, uint8_t datalen);
+    void _startTransfer();
+    void _transfer(uint8_t value); 
+    void _endTransfer();
+    void _beginTransaction(const SPISettings& settings);
+    void _spi_write(uint8_t data);
+    void _endTransaction();
+  public:
+    void _waitWhileBusy(const char* comment = 0, uint16_t busy_time = 5000);
+    void _writeCommand(uint8_t c);
+    void _writeData(uint8_t d);
+    void _writeData(const uint8_t* data, uint16_t n);
+    uint8_t _readData();
+    void _readData(uint8_t* data, uint16_t n);
+  protected:
+    int16_t _sck, _mosi;
+    int16_t _cs, _dc, _rst, _busy, _busy_level;
+    uint32_t _busy_timeout;
+    bool _diag_enabled, _pulldown_rst_mode;
+    SPISettings _spi_settings;
+    bool _initial_write, _initial_refresh;
+    bool _power_is_on, _using_partial_mode, _hibernating;
+    bool _init_display_done;
+    uint16_t _reset_duration;
+};
+
+#endif