Waveshare e-paper displays with SPI

If it helps your analysis, I have an oscilloscope and can measure voltages and record waveforms.

jtknep:
If it helps your analysis, I have an oscilloscope and can measure voltages and record waveforms.

Thanks for the offer, but I am not interested in the analysis, until you provide clear information.
A picture would make clear what configuration you use.
Report if you have tried with the GxEPD2_WS_ESP32_Driver.ino example. What processor board did you select to compile for?

Does this mean that the pin assignment can be ignored when using the FPC and running the GxEPD2_WS_ESP32_Driver.ino sketch?

Not ignored, but the constructor parameters are set for that board, and SPI pins are re-mapped.

A picture would make clear what configuration you use.

Please see attachment.

What processor board did you select to compile for?.

ESP32 Dev Module

Report if you have tried with the GxEPD2_WS_ESP32_Driver.ino example.

Yes, I ran it two times. Once after selecting: #define GxEPD2_DRIVER_CLASS GxEPD2_290 // GDEH029A1 128x296 ; then again after selecting: #define GxEPD2_DRIVER_CLASS GxEPD2_290_T94 // GDEM029T94 128x296

The results were the same for both-

  • panel remains all black
  • Serial Monitor is blank, does not show "setup".

Thanks for your continued patience.

@jtknep,

thanks, good picture!

I will re-test this configuration tomorrow. To find out what might be wrong.
I once had a problem when compiled for ESP32 Dev Module, it used to work before, so I used Wemos LOLIN32 instead. The RESE switch also needs to be verified against the reference circuit in the panel specs.

Jean-Marc

Success! Specifying the WEMOS LOLIN32 board and the GDEM029T94,128x296 panel makes the
GxEPD2_WS_ESP32_Driver.ino sketch work well.

I hate to admit it has taken me two weeks to achieve this.

Thank you very much!

@jtknep,

thank you for the feedback!

I have found out what is wrong with compilation for ESP32 Dev Module.

The ESP32 processor hangs on a second call to Serial.begin(115200) when compiled for ESP32 Dev Module.

// SerialBeginTwice test by Jean-Marc Zingg
//
// Purpose: test issue with ESP32 compiled for ESP32 Dev Module

void setup()
{
  Serial.begin(115200);
  delay(100);
  Serial.println("going to call Serial.begin(115200); a second time. Should tell success ...");
  delay(100);
  Serial.begin(115200);
  delay(100);
  Serial.println("... success, returned from second call to Serial.begin(115200); Bye and out.");
  delay(100);
}

void loop() {}

I verified this on a ESP32 Dev Module clone, on a Wemos LOLIN32 Lite, and on the Waveshare e-Paper ESP32 Driver Board.

The GxEPD2 examples call Serial.begin(115200) in setup() to Serial.print("setup"), and again in display.init(115200).

The example GxEPD2_WS_ESP32_Driver.ino with GDEM029T94 works ok if compiled for WEMOS LOLIN32.
(I first had an issue with garbage during partial update, because I had selected GxEPD2_3C instead of GxEPD2_BW).

The display class and the driver class need to correspond for monochrome or 3-color.
I don't see an easy way to check during compile time. Maybe I should add a warning diagnostic at runtime.

Jean-Marc

I have opened an issue in espressif/arduino-esp32: Arduino core for the ESP32 (github.com)
The ESP32 processor hangs on a second call to Serial.begin(115200) when compiled for ESP32 Dev Module. · Issue #5043 · espressif/arduino-esp32 (github.com)

Hi Jean-Marc,

You mentioned back in this post #2499 you were thinking about asking Good Display for a sample of the GDEW029T5D.
Is this display on your wish list for added support?
Thanks

Hi @d2468,

I did mention that I intended to buy it, and ask for additional free samples.

In the meantime I got the GDEW029T5D, and a GDEW0213T5D as free sample.

The GDEW029T5D works with GxEPD2 as GDEW029T5, according to initial tests.
But it might work better with the waveform table from OTP, which is slower.
I think the OTP waveform table supports 4 grey levels, but I have not yet verified.
I am currently somehow stuck in other work, so progress is delayed.

Do you ask because you want to use this e-paper panel?

Jean-Marc

Great.
Yes I was looking at buying one of these displays.
I was considering the GDEW0295TD for its advertised faster full refresh speed than the 0295T (0.82 vs 3 seconds).
I don’t care about the 4 grey levels, mainly just the refresh speed.

2.9 inch e-paper display black and white 4 grayscale partial refresh, GDEW029T5D _e-ink display-Good Display (good-display.com)

FULL REFRESH(s) 3
PARTIAL REFRESH RATE(s) 0.3

Seems to be conflicting information at 2.9 inch e-paper display SPI Support for partial refresh e-ink module screen (buy-lcd.com)
image
But then down lower it says 3 seconds.
I’ll follow up with Good Display

Hey everyone, I’m fairly new on this forum. I tried to read the most recent posts and used the search function, but I couldn’t find an answer. My question is: Could it be that Waveshare produce a new version of the 2.9" e-paper displays? I’ve recently bought one for a project but wasn’t able to make it work with GxEPD2. The pin connections must be correct, because it works with my 2.7" display. I’ve noticed a V2 sticker at the back of the module.
Do you guys have any information?

EDIT: It seems to work with the recent code on the waveshare wiki

@allllo, Hi, welcome to the forum, please read How to get the best out of this forum.

"The actual version of the 2.9" b/w e-paper board from Waveshare is not supported by GxEPD2." Has been falsified by @vanilla_chief .

I don’t have that board, and nobody had confirmed which panel this board actually uses.

Newbies can’t use this board with GxEPD2, because they don’t read the remarks in README.md concerning “clever” reset circuit and pull-down on CS.
And they are not able to provide enough information for me to help them. E.g. processor used.

The best solution is to tell Waveshare they should send me a free sample, so I could check.

Jean-Marc

I have the same board and problem. Could the display be salvaged by disconnecting it from the board and reconnecting it to a DESPI-C02? Or do I need to buy a new (supported) display?

@vanilla_chief, Hi, welcome to the forum. Please read How to get the best out of this forum.

Please always post as much information as possible. It gets frustrating to have to ask back!

What processor did you use, link to the display (to make sure it is a board with booster circuit, level converter, b/w or 3-color etc.).

What constructor did you use, do parameters match your wiring?

What inking do you see on the flex connector (to compare to the panels I have).

What diagnostic information is reported in Serial Monitor (please put it into a code window), by which example?

Jean-Marc

Yes, it could be worth to try with the DESPI-C02. But if the panel works, you should be able to get it to work with the Waveshare board. You may need to use init() with shortened reset, and maybe use a different pin for CS. I would expect the panel to be the GDEM029T94.

I am sorry, here is the missing info:

The display I am using:

The Amazon link I ordered it from.

The inking on the flex connector:

It is connected to this ESP32:

The code with the constructor(?) line for GxEPD2_DRIVER_CLASS GxEPD2_290 // GDEH029A1 128x296 uncommented

// Display Library example for SPI e-paper panels from Dalian Good Display and boards from Waveshare.
// Requires HW SPI and Adafruit_GFX. Caution: the e-paper panels require 3.3V supply AND data lines!
//
// Display Library 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

// Supporting Arduino Forum Topics:
// Waveshare e-paper displays with SPI: http://forum.arduino.cc/index.php?topic=487007.0
// Good Display ePaper for Arduino: https://forum.arduino.cc/index.php?topic=436411.0

// select the display class (only one), matching the kind of display panel
#define GxEPD2_DISPLAY_CLASS GxEPD2_BW
//#define GxEPD2_DISPLAY_CLASS GxEPD2_3C
//#define GxEPD2_DISPLAY_CLASS GxEPD2_7C

// select the display driver class (only one) for your  panel
//#define GxEPD2_DRIVER_CLASS GxEPD2_154     // GDEP015OC1  200x200, no longer available
//#define GxEPD2_DRIVER_CLASS GxEPD2_154_D67 // GDEH0154D67 200x200
//#define GxEPD2_DRIVER_CLASS GxEPD2_154_T8  // GDEW0154T8  152x152
//#define GxEPD2_DRIVER_CLASS GxEPD2_154_M09 // GDEW0154M09 200x200
//#define GxEPD2_DRIVER_CLASS GxEPD2_154_M10 // GDEW0154M10 152x152
//#define GxEPD2_DRIVER_CLASS GxEPD2_213     // GDE0213B1   128x250, phased out
//#define GxEPD2_DRIVER_CLASS GxEPD2_213_B72 // GDEH0213B72 128x250
//#define GxEPD2_DRIVER_CLASS GxEPD2_213_B73 // GDEH0213B73 128x250
//#define GxEPD2_DRIVER_CLASS GxEPD2_213_flex // GDEW0213I5F 128x250
//#define GxEPD2_DRIVER_CLASS GxEPD2_213_M21 // GDEW0213M21 128x250
#define GxEPD2_DRIVER_CLASS GxEPD2_290     // GDEH029A1   128x296
//#define GxEPD2_DRIVER_CLASS GxEPD2_290_T5  // GDEW029T5   128x296
//#define GxEPD2_DRIVER_CLASS GxEPD2_290_T94 // GDEM029T94  128x296
//#define GxEPD2_DRIVER_CLASS GxEPD2_290_M06 // GDEW029M06  128x296
//#define GxEPD2_DRIVER_CLASS GxEPD2_260     // GDEW026T0   152x296
//#define GxEPD2_DRIVER_CLASS GxEPD2_260_M01 // GDEW026M01  152x296
//#define GxEPD2_DRIVER_CLASS GxEPD2_270     // GDEW027W3   176x264
//#define GxEPD2_DRIVER_CLASS GxEPD2_371     // GDEW0371W7  240x416
//#define GxEPD2_DRIVER_CLASS GxEPD2_420     // GDEW042T2   400x300
//#define GxEPD2_DRIVER_CLASS GxEPD2_420_M01 // GDEW042M01  400x300
//#define GxEPD2_DRIVER_CLASS GxEPD2_583     // GDEW0583T7  600x448
//#define GxEPD2_DRIVER_CLASS GxEPD2_583_T8  // GDEW0583T8  648x480
//#define GxEPD2_DRIVER_CLASS GxEPD2_750     // GDEW075T8   640x384
//#define GxEPD2_DRIVER_CLASS GxEPD2_750_T7  // GDEW075T7   800x480
// 3-color e-papers
//#define GxEPD2_DRIVER_CLASS GxEPD2_154c     // GDEW0154Z04 200x200, no longer available
//#define GxEPD2_DRIVER_CLASS GxEPD2_154_Z90c // GDEH0154Z90 200x200
//#define GxEPD2_DRIVER_CLASS GxEPD2_213c     // GDEW0213Z16 104x212
//#define GxEPD2_DRIVER_CLASS GxEPD2_290c     // GDEW029Z10  128x296
//#define GxEPD2_DRIVER_CLASS GxEPD2_290_C90c // GDEM029C90  128x296
//#define GxEPD2_DRIVER_CLASS GxEPD2_270c     // GDEW027C44  176x264
//#define GxEPD2_DRIVER_CLASS GxEPD2_420c     // GDEW042Z15  400x300
//#define GxEPD2_DRIVER_CLASS GxEPD2_583c     // GDEW0583Z21 600x448
//#define GxEPD2_DRIVER_CLASS GxEPD2_750c     // GDEW075Z09  640x384
//#define GxEPD2_DRIVER_CLASS GxEPD2_750c_Z08 // GDEW075Z08  800x480
//#define GxEPD2_DRIVER_CLASS GxEPD2_750c_Z90 // GDEH075Z90  880x528
//#define GxEPD2_DRIVER_CLASS GxEPD2_1248     // GDEW1248T3  1303x984
// 7-color e-paper
//#define GxEPD2_DRIVER_CLASS GxEPD2_565c // Waveshare 5.65" 7-color (3C graphics)
// grey levels parallel IF e-papers on Waveshare e-Paper IT8951 Driver HAT
//#define GxEPD2_DRIVER_CLASS GxEPD2_it60           // ED060SCT 800x600
//#define GxEPD2_DRIVER_CLASS GxEPD2_it60_1448x1072 // ED060KC1 1448x1072

// SS is usually used for CS. define here for easy change
#ifndef EPD_CS
#define EPD_CS SS
#endif

#if defined(GxEPD2_DISPLAY_CLASS) && defined(GxEPD2_DRIVER_CLASS)

// somehow there should be an easier way to do this
#define GxEPD2_BW_IS_GxEPD2_BW true
#define GxEPD2_3C_IS_GxEPD2_3C true
#define GxEPD2_7C_IS_GxEPD2_7C true
#define GxEPD2_1248_IS_GxEPD2_1248 true
#define IS_GxEPD(c, x) (c##x)
#define IS_GxEPD2_BW(x) IS_GxEPD(GxEPD2_BW_IS_, x)
#define IS_GxEPD2_3C(x) IS_GxEPD(GxEPD2_3C_IS_, x)
#define IS_GxEPD2_7C(x) IS_GxEPD(GxEPD2_7C_IS_, x)
#define IS_GxEPD2_1248(x) IS_GxEPD(GxEPD2_1248_IS_, x)

#if defined (ESP8266)
#define MAX_DISPLAY_BUFFER_SIZE (81920ul-34000ul-5000ul) // ~34000 base use, change 5000 to your application use
#if IS_GxEPD2_BW(GxEPD2_DISPLAY_CLASS)
#define MAX_HEIGHT(EPD) (EPD::HEIGHT <= MAX_DISPLAY_BUFFER_SIZE / (EPD::WIDTH / 8) ? EPD::HEIGHT : MAX_DISPLAY_BUFFER_SIZE / (EPD::WIDTH / 8))
#elif IS_GxEPD2_3C(GxEPD2_DISPLAY_CLASS)
#define MAX_HEIGHT(EPD) (EPD::HEIGHT <= (MAX_DISPLAY_BUFFER_SIZE / 2) / (EPD::WIDTH / 8) ? EPD::HEIGHT : (MAX_DISPLAY_BUFFER_SIZE / 2) / (EPD::WIDTH / 8))
#elif IS_GxEPD2_7C(GxEPD2_DISPLAY_CLASS)
#define MAX_HEIGHT(EPD) (EPD::HEIGHT <= (MAX_DISPLAY_BUFFER_SIZE) / (EPD::WIDTH / 2) ? EPD::HEIGHT : (MAX_DISPLAY_BUFFER_SIZE) / (EPD::WIDTH / 2))
#endif
// adapt the constructor parameters to your wiring
GxEPD2_DISPLAY_CLASS<GxEPD2_DRIVER_CLASS, MAX_HEIGHT(GxEPD2_DRIVER_CLASS)> display(GxEPD2_DRIVER_CLASS(/*CS=D8*/ EPD_CS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4));
// mapping of Waveshare e-Paper ESP8266 Driver Board, new version
//GxEPD2_DISPLAY_CLASS<GxEPD2_DRIVER_CLASS, MAX_HEIGHT(GxEPD2_DRIVER_CLASS)> display(GxEPD2_DRIVER_CLASS(/*CS=15*/ EPD_CS, /*DC=4*/ 4, /*RST=2*/ 2, /*BUSY=5*/ 5));
// mapping of Waveshare e-Paper ESP8266 Driver Board, old version
//GxEPD2_DISPLAY_CLASS<GxEPD2_DRIVER_CLASS, MAX_HEIGHT(GxEPD2_DRIVER_CLASS)> display(GxEPD2_DRIVER_CLASS(/*CS=15*/ EPD_CS, /*DC=4*/ 4, /*RST=5*/ 5, /*BUSY=16*/ 16));
#endif

#if defined(ESP32)
#define MAX_DISPLAY_BUFFER_SIZE 65536ul // e.g.
#if IS_GxEPD2_BW(GxEPD2_DISPLAY_CLASS)
#define MAX_HEIGHT(EPD) (EPD::HEIGHT <= MAX_DISPLAY_BUFFER_SIZE / (EPD::WIDTH / 8) ? EPD::HEIGHT : MAX_DISPLAY_BUFFER_SIZE / (EPD::WIDTH / 8))
#elif IS_GxEPD2_3C(GxEPD2_DISPLAY_CLASS)
#define MAX_HEIGHT(EPD) (EPD::HEIGHT <= (MAX_DISPLAY_BUFFER_SIZE / 2) / (EPD::WIDTH / 8) ? EPD::HEIGHT : (MAX_DISPLAY_BUFFER_SIZE / 2) / (EPD::WIDTH / 8))
#elif IS_GxEPD2_7C(GxEPD2_DISPLAY_CLASS)
#define MAX_HEIGHT(EPD) (EPD::HEIGHT <= (MAX_DISPLAY_BUFFER_SIZE) / (EPD::WIDTH / 2) ? EPD::HEIGHT : (MAX_DISPLAY_BUFFER_SIZE) / (EPD::WIDTH / 2))
#endif
// adapt the constructor parameters to your wiring
#if !IS_GxEPD2_1248(GxEPD2_DRIVER_CLASS)
#if defined(ARDUINO_LOLIN_D32_PRO)
GxEPD2_DISPLAY_CLASS<GxEPD2_DRIVER_CLASS, MAX_HEIGHT(GxEPD2_DRIVER_CLASS)> display(GxEPD2_DRIVER_CLASS(/*CS=5*/ EPD_CS, /*DC=*/ 0, /*RST=*/ 2, /*BUSY=*/ 15));
#elif defined(ARDUINO_ESP32_DEV) // e.g. TTGO T8 ESP32-WROVER
GxEPD2_DISPLAY_CLASS<GxEPD2_DRIVER_CLASS, MAX_HEIGHT(GxEPD2_DRIVER_CLASS)> display(GxEPD2_DRIVER_CLASS(/*CS=5*/ EPD_CS, /*DC=*/ 2, /*RST=*/ 0, /*BUSY=*/ 4));
#else
GxEPD2_DISPLAY_CLASS<GxEPD2_DRIVER_CLASS, MAX_HEIGHT(GxEPD2_DRIVER_CLASS)> display(GxEPD2_DRIVER_CLASS(/*CS=5*/ EPD_CS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4));
#endif
#else // GxEPD2_1248
// Waveshare 12.48 b/w SPI display board and frame or Good Display 12.48 b/w panel GDEW1248T3
// general constructor for use with all parameters, e.g. for Waveshare ESP32 driver board mounted on connection board
GxEPD2_BW < GxEPD2_1248, GxEPD2_1248::HEIGHT / 4 > display(GxEPD2_1248(/*sck=*/ 13, /*miso=*/ 12, /*mosi=*/ 14,
    /*cs_m1=*/ 23, /*cs_s1=*/ 22, /*cs_m2=*/ 16, /*cs_s2=*/ 19,
    /*dc1=*/ 25, /*dc2=*/ 17, /*rst1=*/ 33, /*rst2=*/ 5,
    /*busy_m1=*/ 32, /*busy_s1=*/ 26, /*busy_m2=*/ 18, /*busy_s2=*/ 4));
#endif
#endif

// can't use package "STMF1 Boards (STM32Duino.com)" (Roger Clark) anymore with Adafruit_GFX, use "STM32 Boards (selected from submenu)" (STMicroelectronics)
#if defined(ARDUINO_ARCH_STM32)
#define MAX_DISPLAY_BUFFER_SIZE 15000ul // ~15k is a good compromise
#if IS_GxEPD2_BW(GxEPD2_DISPLAY_CLASS)
#define MAX_HEIGHT(EPD) (EPD::HEIGHT <= MAX_DISPLAY_BUFFER_SIZE / (EPD::WIDTH / 8) ? EPD::HEIGHT : MAX_DISPLAY_BUFFER_SIZE / (EPD::WIDTH / 8))
#elif IS_GxEPD2_3C(GxEPD2_DISPLAY_CLASS)
#define MAX_HEIGHT(EPD) (EPD::HEIGHT <= (MAX_DISPLAY_BUFFER_SIZE / 2) / (EPD::WIDTH / 8) ? EPD::HEIGHT : (MAX_DISPLAY_BUFFER_SIZE / 2) / (EPD::WIDTH / 8))
#elif IS_GxEPD2_7C(GxEPD2_DISPLAY_CLASS)
#define MAX_HEIGHT(EPD) (EPD::HEIGHT <= (MAX_DISPLAY_BUFFER_SIZE) / (EPD::WIDTH / 2) ? EPD::HEIGHT : (MAX_DISPLAY_BUFFER_SIZE) / (EPD::WIDTH / 2))
#endif
// adapt the constructor parameters to your wiring
GxEPD2_DISPLAY_CLASS<GxEPD2_DRIVER_CLASS, MAX_HEIGHT(GxEPD2_DRIVER_CLASS)> display(GxEPD2_DRIVER_CLASS(/*CS=4*/ EPD_CS, /*DC=*/ 3, /*RST=*/ 2, /*BUSY=*/ 1));
#endif

#if defined(__AVR)
#if defined (ARDUINO_AVR_MEGA2560) // Note: SS is on 53 on MEGA
#define MAX_DISPLAY_BUFFER_SIZE 5000 // e.g. full height for 200x200
#else // Note: SS is on 10 on UNO, NANO
#define MAX_DISPLAY_BUFFER_SIZE 800 // 
#endif
#if IS_GxEPD2_BW(GxEPD2_DISPLAY_CLASS)
#define MAX_HEIGHT(EPD) (EPD::HEIGHT <= MAX_DISPLAY_BUFFER_SIZE / (EPD::WIDTH / 8) ? EPD::HEIGHT : MAX_DISPLAY_BUFFER_SIZE / (EPD::WIDTH / 8))
#elif IS_GxEPD2_3C(GxEPD2_DISPLAY_CLASS)
#define MAX_HEIGHT(EPD) (EPD::HEIGHT <= (MAX_DISPLAY_BUFFER_SIZE / 2) / (EPD::WIDTH / 8) ? EPD::HEIGHT : (MAX_DISPLAY_BUFFER_SIZE / 2) / (EPD::WIDTH / 8))
#elif IS_GxEPD2_7C(GxEPD2_DISPLAY_CLASS)
#define MAX_HEIGHT(EPD) (EPD::HEIGHT <= (MAX_DISPLAY_BUFFER_SIZE) / (EPD::WIDTH / 2) ? EPD::HEIGHT : (MAX_DISPLAY_BUFFER_SIZE) / (EPD::WIDTH / 2))
#endif
// adapt the constructor parameters to your wiring
GxEPD2_DISPLAY_CLASS<GxEPD2_DRIVER_CLASS, MAX_HEIGHT(GxEPD2_DRIVER_CLASS)> display(GxEPD2_DRIVER_CLASS(/*CS=*/ EPD_CS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
#endif

#if defined(ARDUINO_ARCH_SAM)
#define MAX_DISPLAY_BUFFER_SIZE 32768ul // e.g., up to 96k
#if IS_GxEPD2_BW(GxEPD2_DISPLAY_CLASS)
#define MAX_HEIGHT(EPD) (EPD::HEIGHT <= MAX_DISPLAY_BUFFER_SIZE / (EPD::WIDTH / 8) ? EPD::HEIGHT : MAX_DISPLAY_BUFFER_SIZE / (EPD::WIDTH / 8))
#elif IS_GxEPD2_3C(GxEPD2_DISPLAY_CLASS)
#define MAX_HEIGHT(EPD) (EPD::HEIGHT <= (MAX_DISPLAY_BUFFER_SIZE / 2) / (EPD::WIDTH / 8) ? EPD::HEIGHT : (MAX_DISPLAY_BUFFER_SIZE / 2) / (EPD::WIDTH / 8))
#elif IS_GxEPD2_7C(GxEPD2_DISPLAY_CLASS)
#define MAX_HEIGHT(EPD) (EPD::HEIGHT <= (MAX_DISPLAY_BUFFER_SIZE) / (EPD::WIDTH / 2) ? EPD::HEIGHT : (MAX_DISPLAY_BUFFER_SIZE) / (EPD::WIDTH / 2))
#endif
// adapt the constructor parameters to your wiring
GxEPD2_DISPLAY_CLASS<GxEPD2_DRIVER_CLASS, MAX_HEIGHT(GxEPD2_DRIVER_CLASS)> display(GxEPD2_DRIVER_CLASS(/*CS=77*/ EPD_CS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
#endif

#if defined(ARDUINO_ARCH_SAMD)
#define MAX_DISPLAY_BUFFER_SIZE 15000ul // ~15k is a good compromise
#if IS_GxEPD2_BW(GxEPD2_DISPLAY_CLASS)
#define MAX_HEIGHT(EPD) (EPD::HEIGHT <= MAX_DISPLAY_BUFFER_SIZE / (EPD::WIDTH / 8) ? EPD::HEIGHT : MAX_DISPLAY_BUFFER_SIZE / (EPD::WIDTH / 8))
#elif IS_GxEPD2_3C(GxEPD2_DISPLAY_CLASS)
#define MAX_HEIGHT(EPD) (EPD::HEIGHT <= (MAX_DISPLAY_BUFFER_SIZE / 2) / (EPD::WIDTH / 8) ? EPD::HEIGHT : (MAX_DISPLAY_BUFFER_SIZE / 2) / (EPD::WIDTH / 8))
#elif IS_GxEPD2_7C(GxEPD2_DISPLAY_CLASS)
#define MAX_HEIGHT(EPD) (EPD::HEIGHT <= (MAX_DISPLAY_BUFFER_SIZE) / (EPD::WIDTH / 2) ? EPD::HEIGHT : (MAX_DISPLAY_BUFFER_SIZE) / (EPD::WIDTH / 2))
#endif
// adapt the constructor parameters to your wiring
GxEPD2_DISPLAY_CLASS<GxEPD2_DRIVER_CLASS, MAX_HEIGHT(GxEPD2_DRIVER_CLASS)> display(GxEPD2_DRIVER_CLASS(/*CS=4*/ 4, /*DC=*/ 7, /*RST=*/ 6, /*BUSY=*/ 5));
#endif

#endif

I used this wiring example:

// mapping suggestion for ESP32, e.g. LOLIN32, see .../variants/.../pins_arduino.h for your board
// NOTE: there are variants with different pins for SPI ! CHECK SPI PINS OF YOUR BOARD
// BUSY -> 4, RST -> 16, DC -> 17, CS -> SS(5), CLK -> SCK(18), DIN -> MOSI(23), GND -> GND, 3.3V -> 3.3V

This is the example code I am using:

// Display Library example for SPI e-paper panels from Dalian Good Display and boards from Waveshare.
// Requires HW SPI and Adafruit_GFX. Caution: the e-paper panels require 3.3V supply AND data lines!
//
// Display Library 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

// Supporting Arduino Forum Topics:
// Waveshare e-paper displays with SPI: http://forum.arduino.cc/index.php?topic=487007.0
// Good Display ePaper for Arduino: https://forum.arduino.cc/index.php?topic=436411.0

// see GxEPD2_wiring_examples.h for wiring suggestions and examples

// base class GxEPD2_GFX can be used to pass references or pointers to the display instance as parameter, uses ~1.2k more code
// enable or disable GxEPD2_GFX base class
#define ENABLE_GxEPD2_GFX 0

// uncomment next line to use class GFX of library GFX_Root instead of Adafruit_GFX
//#include <GFX.h>
// Note: if you use this with ENABLE_GxEPD2_GFX 1:
//       uncomment it in GxEPD2_GFX.h too, or add #include <GFX.h> before any #include <GxEPD2_GFX.h>

#include <GxEPD2_BW.h>
#include <GxEPD2_3C.h>
#include <GxEPD2_7C.h>
#include <Fonts/FreeMonoBold9pt7b.h>

// select the display constructor line in one of the following files (old style):
#include "GxEPD2_display_selection.h"
#include "GxEPD2_display_selection_added.h"
//#include "GxEPD2_display_selection_more.h" // private

// or select the display class and display driver class in the following file (new style):
#include "GxEPD2_display_selection_new_style.h"

#if !defined(__AVR) && !defined(_BOARD_GENERIC_STM32F103C_H_)

// note 16.11.2019: the compiler may exclude code based on constant if statements (display.epd2.panel == constant),
//                  therefore bitmaps may get optimized out by the linker

// comment out unused bitmaps to reduce code space used
#include "bitmaps/Bitmaps152x152.h" // 1.54" b/w
#include "bitmaps/Bitmaps200x200.h" // 1.54" b/w
#include "bitmaps/Bitmaps104x212.h" // 2.13" b/w flexible GDEW0213I5F
#include "bitmaps/Bitmaps128x250.h" // 2.13" b/w
#include "bitmaps/Bitmaps128x296.h" // 2.9"  b/w
#include "bitmaps/Bitmaps152x296.h" // 2.6"  b/w
#include "bitmaps/Bitmaps176x264.h" // 2.7"  b/w
#include "bitmaps/Bitmaps240x416.h" // 3.71"  b/w
#include "bitmaps/Bitmaps400x300.h" // 4.2"  b/w
#include "bitmaps/Bitmaps648x480.h" // 5.38"  b/w
#include "bitmaps/Bitmaps640x384.h" // 7.5"  b/w
#include "bitmaps/Bitmaps800x480.h" // 7.5"  b/w
// 3-color
#include "bitmaps/Bitmaps3c200x200.h" // 1.54" b/w/r
#include "bitmaps/Bitmaps3c104x212.h" // 2.13" b/w/r
#include "bitmaps/Bitmaps3c128x296.h" // 2.9"  b/w/r
#include "bitmaps/Bitmaps3c176x264.h" // 2.7"  b/w/r
#include "bitmaps/Bitmaps3c400x300.h" // 4.2"  b/w/r
#if defined(ESP8266) || defined(ESP32)
#include "bitmaps/Bitmaps3c800x480.h" // 7.5"  b/w/r
#include "bitmaps/Bitmaps3c880x528.h" // 7.5"  b/w/r
#include "bitmaps/WS_Bitmaps800x600.h" // 6.0"  grey
#include "bitmaps/WS_Bitmaps7c192x143.h" // 5.65" 7-color
#endif
#if defined(ESP32)
#include "bitmaps/Bitmaps1304x984.h" // 12.48" b/w
#endif

#else

// select only one to fit in code space
#include "bitmaps/Bitmaps200x200.h" // 1.54" b/w
//#include "bitmaps/Bitmaps104x212.h" // 2.13" b/w flexible GDEW0213I5F
//#include "bitmaps/Bitmaps128x250.h" // 2.13" b/w
//#include "bitmaps/Bitmaps128x296.h" // 2.9"  b/w
//#include "bitmaps/Bitmaps176x264.h" // 2.7"  b/w
////#include "bitmaps/Bitmaps400x300.h" // 4.2"  b/w // not enough code space
////#include "bitmaps/Bitmaps640x384.h" // 7.5"  b/w // not enough code space
// 3-color
//#include "bitmaps/Bitmaps3c200x200.h" // 1.54" b/w/r
//#include "bitmaps/Bitmaps3c104x212.h" // 2.13" b/w/r
//#include "bitmaps/Bitmaps3c128x296.h" // 2.9"  b/w/r
//#include "bitmaps/Bitmaps3c176x264.h" // 2.7"  b/w/r
////#include "bitmaps/Bitmaps3c400x300.h" // 4.2"  b/w/r // not enough code space

#endif

void setup()
{
  Serial.begin(115200);
  Serial.println();
  Serial.println("setup");
  delay(100);
  display.init(115200, true, 2, false);
  // first update should be full refresh
  helloWorld();
  delay(1000);
  // partial refresh mode can be used to full screen,
  // effective if display panel hasFastPartialUpdate
  helloFullScreenPartialMode();
  delay(1000);
  helloArduino();
  delay(1000);
  helloEpaper();
  delay(1000);
  //helloValue(123.9, 1);
  //delay(1000);
  showFont("FreeMonoBold9pt7b", &FreeMonoBold9pt7b);
  delay(1000);
  drawBitmaps();
#if !defined(__AVR) // takes too long!
  if (display.epd2.panel == GxEPD2::ACeP565)
  {
    //draw7colorlines();
    //delay(2000);
    draw7colors();
    delay(4000);
  }
#endif
  if (display.epd2.hasPartialUpdate)
  {
    showPartialUpdate();
    delay(1000);
  } // else // on GDEW0154Z04 only full update available, doesn't look nice
  //drawCornerTest();
  //showBox(16, 16, 48, 32, false);
  //showBox(16, 56, 48, 32, true);
  display.powerOff();
  deepSleepTest();
#if defined(ESP32) && defined(_GxBitmaps1304x984_H_)
  drawBitmaps1304x984();
  display.powerOff();
#endif
  Serial.println("setup done");
}

void loop()
{
}

// note for partial update window and setPartialWindow() method:
// partial update window size and position is on byte boundary in physical x direction
// the size is increased in setPartialWindow() if x or w are not multiple of 8 for even rotation, y or h for odd rotation
// see also comment in GxEPD2_BW.h, GxEPD2_3C.h or GxEPD2_GFX.h for method setPartialWindow()

const char HelloWorld[] = "Hello World!";
const char HelloArduino[] = "Hello Arduino!";
const char HelloEpaper[] = "Hello E-Paper!";

void helloWorld()
{
  //Serial.println("helloWorld");
  display.setRotation(1);
  display.setFont(&FreeMonoBold9pt7b);
  display.setTextColor(GxEPD_BLACK);
  int16_t tbx, tby; uint16_t tbw, tbh;
  display.getTextBounds(HelloWorld, 0, 0, &tbx, &tby, &tbw, &tbh);
  // center bounding box by transposition of origin:
  uint16_t x = ((display.width() - tbw) / 2) - tbx;
  uint16_t y = ((display.height() - tbh) / 2) - tby;
  display.setFullWindow();
  display.firstPage();
  do
  {
    display.fillScreen(GxEPD_WHITE);
    display.setCursor(x, y);
    display.print(HelloWorld);
  }
  while (display.nextPage());
  //Serial.println("helloWorld done");
}

void helloWorldForDummies()
{
  //Serial.println("helloWorld");
  const char text[] = "Hello World!";
  // most e-papers have width < height (portrait) as native orientation, especially the small ones
  // in GxEPD2 rotation 0 is used for native orientation (most TFT libraries use 0 fix for portrait orientation)
  // set rotation to 1 (rotate right 90 degrees) to have enough space on small displays (landscape)
  display.setRotation(1);
  // select a suitable font in Adafruit_GFX
  display.setFont(&FreeMonoBold9pt7b);
  // on e-papers black on white is more pleasant to read
  display.setTextColor(GxEPD_BLACK);
  // Adafruit_GFX has a handy method getTextBounds() to determine the boundary box for a text for the actual font
  int16_t tbx, tby; uint16_t tbw, tbh; // boundary box window
  display.getTextBounds(text, 0, 0, &tbx, &tby, &tbw, &tbh); // it works for origin 0, 0, fortunately (negative tby!)
  // center bounding box by transposition of origin:
  uint16_t x = ((display.width() - tbw) / 2) - tbx;
  uint16_t y = ((display.height() - tbh) / 2) - tby;
  // full window mode is the initial mode, set it anyway
  display.setFullWindow();
  // here we use paged drawing, even if the processor has enough RAM for full buffer
  // so this can be used with any supported processor board.
  // the cost in code overhead and execution time penalty is marginal
  // tell the graphics class to use paged drawing mode
  display.firstPage();
  do
  {
    // this part of code is executed multiple times, as many as needed,
    // in case of full buffer it is executed once
    // IMPORTANT: each iteration needs to draw the same, to avoid strange effects
    // use a copy of values that might change, don't read e.g. from analog or pins in the loop!
    display.fillScreen(GxEPD_WHITE); // set the background to white (fill the buffer with value for white)
    display.setCursor(x, y); // set the postition to start printing text
    display.print(text); // print some text
    // end of part executed multiple times
  }
  // tell the graphics class to transfer the buffer content (page) to the controller buffer
  // the graphics class will command the controller to refresh to the screen when the last page has been transferred
  // returns true if more pages need be drawn and transferred
  // returns false if the last page has been transferred and the screen refreshed for panels without fast partial update
  // returns false for panels with fast partial update when the controller buffer has been written once more, to make the differential buffers equal
  // (for full buffered with fast partial update the (full) buffer is just transferred again, and false returned)
  while (display.nextPage());
  //Serial.println("helloWorld done");
}

void helloFullScreenPartialMode()
{
  //Serial.println("helloFullScreenPartialMode");
  const char fullscreen[] = "full screen update";
  const char fpm[] = "fast partial mode";
  const char spm[] = "slow partial mode";
  const char npm[] = "no partial mode";
  display.setPartialWindow(0, 0, display.width(), display.height());
  display.setRotation(1);
  display.setFont(&FreeMonoBold9pt7b);
  display.setTextColor(GxEPD_BLACK);
  const char* updatemode;
  if (display.epd2.hasFastPartialUpdate)
  {
    updatemode = fpm;
  }
  else if (display.epd2.hasPartialUpdate)
  {
    updatemode = spm;
  }
  else
  {
    updatemode = npm;
  }
  // do this outside of the loop
  int16_t tbx, tby; uint16_t tbw, tbh;
  // center update text
  display.getTextBounds(fullscreen, 0, 0, &tbx, &tby, &tbw, &tbh);
  uint16_t utx = ((display.width() - tbw) / 2) - tbx;
  uint16_t uty = ((display.height() / 4) - tbh / 2) - tby;
  // center update mode
  display.getTextBounds(updatemode, 0, 0, &tbx, &tby, &tbw, &tbh);
  uint16_t umx = ((display.width() - tbw) / 2) - tbx;
  uint16_t umy = ((display.height() * 3 / 4) - tbh / 2) - tby;
  // center HelloWorld
  display.getTextBounds(HelloWorld, 0, 0, &tbx, &tby, &tbw, &tbh);
  uint16_t hwx = ((display.width() - tbw) / 2) - tbx;
  uint16_t hwy = ((display.height() - tbh) / 2) - tby;
  display.firstPage();
  do
  {
    display.fillScreen(GxEPD_WHITE);
    display.setCursor(hwx, hwy);
    display.print(HelloWorld);
    display.setCursor(utx, uty);
    display.print(fullscreen);
    display.setCursor(umx, umy);
    display.print(updatemode);
  }
  while (display.nextPage());
  //Serial.println("helloFullScreenPartialMode done");
}

void helloArduino()
{
  //Serial.println("helloArduino");
  display.setRotation(1);
  display.setFont(&FreeMonoBold9pt7b);
  display.setTextColor(display.epd2.hasColor ? GxEPD_RED : GxEPD_BLACK);
  int16_t tbx, tby; uint16_t tbw, tbh;
  // align with centered HelloWorld
  display.getTextBounds(HelloWorld, 0, 0, &tbx, &tby, &tbw, &tbh);
  uint16_t x = ((display.width() - tbw) / 2) - tbx;
  // height might be different
  display.getTextBounds(HelloArduino, 0, 0, &tbx, &tby, &tbw, &tbh);
  uint16_t y = ((display.height() / 4) - tbh / 2) - tby; // y is base line!
  // make the window big enough to cover (overwrite) descenders of previous text
  uint16_t wh = FreeMonoBold9pt7b.yAdvance;
  uint16_t wy = (display.height() / 4) - wh / 2;
  display.setPartialWindow(0, wy, display.width(), wh);
  display.firstPage();
  do
  {
    display.fillScreen(GxEPD_WHITE);
    //display.drawRect(x, y - tbh, tbw, tbh, GxEPD_BLACK);
    display.setCursor(x, y);
    display.print(HelloArduino);
  }
  while (display.nextPage());
  delay(1000);
  //Serial.println("helloArduino done");
}

void helloEpaper()
{
  //Serial.println("helloEpaper");
  display.setRotation(1);
  display.setFont(&FreeMonoBold9pt7b);
  display.setTextColor(display.epd2.hasColor ? GxEPD_RED : GxEPD_BLACK);
  int16_t tbx, tby; uint16_t tbw, tbh;
  // align with centered HelloWorld
  display.getTextBounds(HelloWorld, 0, 0, &tbx, &tby, &tbw, &tbh);
  uint16_t x = ((display.width() - tbw) / 2) - tbx;
  // height might be different
  display.getTextBounds(HelloEpaper, 0, 0, &tbx, &tby, &tbw, &tbh);
  uint16_t y = (display.height() * 3 / 4) + tbh / 2; // y is base line!
  // make the window big enough to cover (overwrite) descenders of previous text
  uint16_t wh = FreeMonoBold9pt7b.yAdvance;
  uint16_t wy = (display.height() * 3 / 4) - wh / 2;
  display.setPartialWindow(0, wy, display.width(), wh);
  display.firstPage();
  do
  {
    display.fillScreen(GxEPD_WHITE);
    display.setCursor(x, y);
    display.print(HelloEpaper);
  }
  while (display.nextPage());
  //Serial.println("helloEpaper done");
}

#if defined(ESP8266) || defined(ESP32)
#include <StreamString.h>
#define PrintString StreamString
#else
class PrintString : public Print, public String
{
  public:
    size_t write(uint8_t data) override
    {
      return concat(char(data));
    };
};
#endif

void helloValue(double v, int digits)
{
  //Serial.println("helloValue");
  display.setRotation(1);
  display.setFont(&FreeMonoBold9pt7b);
  display.setTextColor(display.epd2.hasColor ? GxEPD_RED : GxEPD_BLACK);
  PrintString valueString;
  valueString.print(v, digits);
  int16_t tbx, tby; uint16_t tbw, tbh;
  display.getTextBounds(valueString, 0, 0, &tbx, &tby, &tbw, &tbh);
  uint16_t x = ((display.width() - tbw) / 2) - tbx;
  uint16_t y = (display.height() * 3 / 4) + tbh / 2; // y is base line!
  // show what happens, if we use the bounding box for partial window
  uint16_t wx = (display.width() - tbw) / 2;
  uint16_t wy = (display.height() * 3 / 4) - tbh / 2;
  display.setPartialWindow(wx, wy, tbw, tbh);
  display.firstPage();
  do
  {
    display.fillScreen(GxEPD_WHITE);
    display.setCursor(x, y);
    display.print(valueString);
  }
  while (display.nextPage());
  delay(2000);
  // make the partial window big enough to cover the previous text
  uint16_t ww = tbw; // remember window width
  display.getTextBounds(HelloEpaper, 0, 0, &tbx, &tby, &tbw, &tbh);
  // adjust, because HelloEpaper was aligned, not centered (could calculate this to be precise)
  ww = max(ww, uint16_t(tbw + 12)); // 12 seems ok
  wx = (display.width() - tbw) / 2;
  // make the window big enough to cover (overwrite) descenders of previous text
  uint16_t wh = FreeMonoBold9pt7b.yAdvance;
  wy = (display.height() * 3 / 4) - wh / 2;
  display.setPartialWindow(wx, wy, ww, wh);
  // alternately use the whole width for partial window
  //display.setPartialWindow(0, wy, display.width(), wh);
  display.firstPage();
  do
  {
    display.fillScreen(GxEPD_WHITE);
    display.setCursor(x, y);
    display.print(valueString);
  }
  while (display.nextPage());
  //Serial.println("helloValue done");
}

void deepSleepTest()
{
  //Serial.println("deepSleepTest");
  const char hibernating[] = "hibernating ...";
  const char wokeup[] = "woke up";
  const char from[] = "from deep sleep";
  const char again[] = "again";
  display.setRotation(1);
  display.setFont(&FreeMonoBold9pt7b);
  display.setTextColor(GxEPD_BLACK);
  int16_t tbx, tby; uint16_t tbw, tbh;
  // center text
  display.getTextBounds(hibernating, 0, 0, &tbx, &tby, &tbw, &tbh);
  uint16_t x = ((display.width() - tbw) / 2) - tbx;
  uint16_t y = ((display.height() - tbh) / 2) - tby;
  display.setFullWindow();
  display.firstPage();
  do
  {
    display.fillScreen(GxEPD_WHITE);
    display.setCursor(x, y);
    display.print(hibernating);
  }
  while (display.nextPage());
  display.hibernate();
  delay(5000);
  display.getTextBounds(wokeup, 0, 0, &tbx, &tby, &tbw, &tbh);
  uint16_t wx = (display.width() - tbw) / 2;
  uint16_t wy = (display.height() / 3) + tbh / 2; // y is base line!
  display.getTextBounds(from, 0, 0, &tbx, &tby, &tbw, &tbh);
  uint16_t fx = (display.width() - tbw) / 2;
  uint16_t fy = (display.height() * 2 / 3) + tbh / 2; // y is base line!
  display.firstPage();
  do
  {
    display.fillScreen(GxEPD_WHITE);
    display.setCursor(wx, wy);
    display.print(wokeup);
    display.setCursor(fx, fy);
    display.print(from);
  }
  while (display.nextPage());
  delay(5000);
  display.getTextBounds(hibernating, 0, 0, &tbx, &tby, &tbw, &tbh);
  uint16_t hx = (display.width() - tbw) / 2;
  uint16_t hy = (display.height() / 3) + tbh / 2; // y is base line!
  display.getTextBounds(again, 0, 0, &tbx, &tby, &tbw, &tbh);
  uint16_t ax = (display.width() - tbw) / 2;
  uint16_t ay = (display.height() * 2 / 3) + tbh / 2; // y is base line!
  display.firstPage();
  do
  {
    display.fillScreen(GxEPD_WHITE);
    display.setCursor(hx, hy);
    display.print(hibernating);
    display.setCursor(ax, ay);
    display.print(again);
  }
  while (display.nextPage());
  display.hibernate();
  //Serial.println("deepSleepTest done");
}

void showBox(uint16_t x, uint16_t y, uint16_t w, uint16_t h, bool partial)
{
  //Serial.println("showBox");
  display.setRotation(1);
  if (partial)
  {
    display.setPartialWindow(x, y, w, h);
  }
  else
  {
    display.setFullWindow();
  }
  display.firstPage();
  do
  {
    display.fillScreen(GxEPD_WHITE);
    display.fillRect(x, y, w, h, GxEPD_BLACK);
  }
  while (display.nextPage());
  //Serial.println("showBox done");
}

void drawCornerTest()
{
  display.setFullWindow();
  display.setFont(&FreeMonoBold9pt7b);
  display.setTextColor(GxEPD_BLACK);
  for (uint16_t r = 0; r <= 4; r++)
  {
    display.setRotation(r);
    display.firstPage();
    do
    {
      display.fillScreen(GxEPD_WHITE);
      display.fillRect(0, 0, 8, 8, GxEPD_BLACK);
      display.fillRect(display.width() - 18, 0, 16, 16, GxEPD_BLACK);
      display.fillRect(display.width() - 25, display.height() - 25, 24, 24, GxEPD_BLACK);
      display.fillRect(0, display.height() - 33, 32, 32, GxEPD_BLACK);
      display.setCursor(display.width() / 2, display.height() / 2);
      display.print(display.getRotation());
    }
    while (display.nextPage());
    delay(2000);
  }
}

void showFont(const char name[], const GFXfont* f)
{
  display.setFullWindow();
  display.setRotation(0);
  display.setTextColor(GxEPD_BLACK);
  display.firstPage();
  do
  {
    drawFont(name, f);
  }
  while (display.nextPage());
}

void drawFont(const char name[], const GFXfont* f)
{
  //display.setRotation(0);
  display.fillScreen(GxEPD_WHITE);
  display.setTextColor(GxEPD_BLACK);
  display.setFont(f);
  display.setCursor(0, 0);
  display.println();
  display.println(name);
  display.println(" !\"#$%&'()*+,-./");
  display.println("0123456789:;<=>?");
  display.println("@ABCDEFGHIJKLMNO");
  display.println("PQRSTUVWXYZ[\\]^_");
  if (display.epd2.hasColor)
  {
    display.setTextColor(GxEPD_RED);
  }
  display.println("`abcdefghijklmno");
  display.println("pqrstuvwxyz{|}~ ");
}

// note for partial update window and setPartialWindow() method:
// partial update window size and position is on byte boundary in physical x direction
// the size is increased in setPartialWindow() if x or w are not multiple of 8 for even rotation, y or h for odd rotation
// see also comment in GxEPD2_BW.h, GxEPD2_3C.h or GxEPD2_GFX.h for method setPartialWindow()
// showPartialUpdate() purposely uses values that are not multiples of 8 to test this

void showPartialUpdate()
{
  // some useful background
  helloWorld();
  // use asymmetric values for test
  uint16_t box_x = 10;
  uint16_t box_y = 15;
  uint16_t box_w = 70;
  uint16_t box_h = 20;
  uint16_t cursor_y = box_y + box_h - 6;
  float value = 13.95;
  uint16_t incr = display.epd2.hasFastPartialUpdate ? 1 : 3;
  display.setFont(&FreeMonoBold9pt7b);
  display.setTextColor(GxEPD_BLACK);
  // show where the update box is
  for (uint16_t r = 0; r < 4; r++)
  {
    display.setRotation(r);
    display.setPartialWindow(box_x, box_y, box_w, box_h);
    display.firstPage();
    do
    {
      display.fillRect(box_x, box_y, box_w, box_h, GxEPD_BLACK);
      //display.fillScreen(GxEPD_BLACK);
    }
    while (display.nextPage());
    delay(2000);
    display.firstPage();
    do
    {
      display.fillRect(box_x, box_y, box_w, box_h, GxEPD_WHITE);
    }
    while (display.nextPage());
    delay(1000);
  }
  //return;
  // show updates in the update box
  for (uint16_t r = 0; r < 4; r++)
  {
    display.setRotation(r);
    display.setPartialWindow(box_x, box_y, box_w, box_h);
    for (uint16_t i = 1; i <= 10; i += incr)
    {
      display.firstPage();
      do
      {
        display.fillRect(box_x, box_y, box_w, box_h, GxEPD_WHITE);
        display.setCursor(box_x, cursor_y);
        display.print(value * i, 2);
      }
      while (display.nextPage());
      delay(500);
    }
    delay(1000);
    display.firstPage();
    do
    {
      display.fillRect(box_x, box_y, box_w, box_h, GxEPD_WHITE);
    }
    while (display.nextPage());
    delay(1000);
  }
}


void drawBitmaps()
{
  display.setFullWindow();
#ifdef _GxBitmaps152x152_H_
  drawBitmaps152x152();
#endif
#ifdef _GxBitmaps104x212_H_
  drawBitmaps104x212();
#endif
#ifdef _GxBitmaps128x250_H_
  drawBitmaps128x250();
#endif
#ifdef _GxBitmaps128x296_H_
  drawBitmaps128x296();
#endif
#ifdef _GxBitmaps176x264_H_
  drawBitmaps176x264();
#endif
#ifdef _GxBitmaps400x300_H_
  drawBitmaps400x300();
#endif
#ifdef _GxBitmaps640x384_H_
  drawBitmaps640x384();
#endif
#ifdef _GxBitmaps648x480_H_
  drawBitmaps648x480();
#endif
#ifdef _GxBitmaps800x480_H_
  drawBitmaps800x480();
#endif
#ifdef _WS_Bitmaps800x600_H_
  drawBitmaps800x600();
#endif
#if defined(ESP32) && defined(_GxBitmaps1304x984_H_)
  drawBitmaps1304x984();
#endif
  // 3-color
#ifdef _GxBitmaps3c104x212_H_
  drawBitmaps3c104x212();
#endif
#ifdef _GxBitmaps3c128x296_H_
  drawBitmaps3c128x296();
#endif
#ifdef _GxBitmaps152x296_H_
  drawBitmaps152x296();
#endif
#ifdef _GxBitmaps3c176x264_H_
  drawBitmaps3c176x264();
#endif
#ifdef _GxBitmaps240x416_H_
  drawBitmaps240x416();
#endif
#ifdef _GxBitmaps3c400x300_H_
  drawBitmaps3c400x300();
#endif
#ifdef _GxBitmaps3c800x480_H_
  drawBitmaps3c800x480();
#endif
#ifdef _GxBitmaps3c880x528_H_
  drawBitmaps3c880x528();
#endif
#if defined(_WS_Bitmaps7c192x143_H_)
  drawBitmaps7c192x143();
#endif
  if ((display.epd2.WIDTH >= 200) && (display.epd2.HEIGHT >= 200))
  {
    // show these after the specific bitmaps
#ifdef _GxBitmaps200x200_H_
    drawBitmaps200x200();
#endif
    // 3-color
#ifdef _GxBitmaps3c200x200_H_
    drawBitmaps3c200x200();
#endif
  }
}

#ifdef _GxBitmaps152x152_H_
void drawBitmaps152x152()
{
#if !defined(__AVR)
  const unsigned char* bitmaps[] =
  {
    Bitmap152x152_1, Bitmap152x152_2, Bitmap152x152_3
  };
#else
  const unsigned char* bitmaps[] =
  {
    Bitmap152x152_1, Bitmap152x152_2, Bitmap152x152_3
  };
#endif
  if ((display.epd2.WIDTH == 152) && (display.epd2.HEIGHT == 152))
  {
    for (uint16_t i = 0; i < sizeof(bitmaps) / sizeof(char*); i++)
    {
      display.firstPage();
      do
      {
        display.fillScreen(GxEPD_WHITE);
        display.drawInvertedBitmap(0, 0, bitmaps[i], 152, 152, GxEPD_BLACK);
      }
      while (display.nextPage());
      delay(2000);
    }
  }
}
#endif

#ifdef _GxBitmaps200x200_H_
void drawBitmaps200x200()
{
#if defined(ARDUINO_AVR_PRO)
  const unsigned char* bitmaps[] =
  {
    logo200x200
  };
#elif defined(__AVR)
  const unsigned char* bitmaps[] =
  {
    logo200x200, //first200x200
  };
#elif defined(_BOARD_GENERIC_STM32F103C_H_) || defined(STM32F1xx)
  const unsigned char* bitmaps[] =
  {
    logo200x200, first200x200, second200x200, third200x200, //fourth200x200, fifth200x200, sixth200x200, senventh200x200, eighth200x200
  };
#else
  const unsigned char* bitmaps[] =
  {
    logo200x200, first200x200, second200x200, third200x200, fourth200x200, fifth200x200, sixth200x200, senventh200x200, eighth200x200
  };
#endif
  if ((display.epd2.WIDTH == 200) && (display.epd2.HEIGHT == 200) && !display.epd2.hasColor)
  {
    bool m = display.mirror(true);
    for (uint16_t i = 0; i < sizeof(bitmaps) / sizeof(char*); i++)
    {
      display.firstPage();
      do
      {
        display.fillScreen(GxEPD_WHITE);
        display.drawInvertedBitmap(0, 0, bitmaps[i], 200, 200, GxEPD_BLACK);
      }
      while (display.nextPage());
      delay(2000);
    }
    display.mirror(m);
  }
  //else
  {
    bool mirror_y = (display.epd2.panel != GxEPD2::GDE0213B1);
    display.clearScreen(); // use default for white
    int16_t x = (int16_t(display.epd2.WIDTH) - 200) / 2;
    int16_t y = (int16_t(display.epd2.HEIGHT) - 200) / 2;
    for (uint16_t i = 0; i < sizeof(bitmaps) / sizeof(char*); i++)
    {
      display.drawImage(bitmaps[i], x, y, 200, 200, false, mirror_y, true);
      delay(2000);
    }
  }
  bool mirror_y = (display.epd2.panel != GxEPD2::GDE0213B1);
  for (uint16_t i = 0; i < sizeof(bitmaps) / sizeof(char*); i++)
  {
    int16_t x = -60;
    int16_t y = -60;
    for (uint16_t j = 0; j < 10; j++)
    {
      display.writeScreenBuffer(); // use default for white
      display.writeImage(bitmaps[i], x, y, 200, 200, false, mirror_y, true);
      display.refresh(true);
      if (display.epd2.hasFastPartialUpdate)
      {
        // for differential update: set previous buffer equal to current buffer in controller
        display.epd2.writeScreenBufferAgain(); // use default for white
        display.epd2.writeImageAgain(bitmaps[i], x, y, 200, 200, false, mirror_y, true);
      }
      delay(2000);
      x += display.epd2.WIDTH / 4;
      y += display.epd2.HEIGHT / 4;
      if ((x >= int16_t(display.epd2.WIDTH)) || (y >= int16_t(display.epd2.HEIGHT))) break;
    }
    if (!display.epd2.hasFastPartialUpdate) break; // comment out for full show
    break; // comment out for full show
  }
  display.writeScreenBuffer(); // use default for white
  display.writeImage(bitmaps[0], int16_t(0), 0, 200, 200, false, mirror_y, true);
  display.writeImage(bitmaps[0], int16_t(int16_t(display.epd2.WIDTH) - 200), int16_t(display.epd2.HEIGHT) - 200, 200, 200, false, mirror_y, true);
  display.refresh(true);
  // for differential update: set previous buffer equal to current buffer in controller
  display.epd2.writeScreenBufferAgain(); // use default for white
  display.epd2.writeImageAgain(bitmaps[0], int16_t(0), 0, 200, 200, false, mirror_y, true);
  display.epd2.writeImageAgain(bitmaps[0], int16_t(int16_t(display.epd2.WIDTH) - 200), int16_t(display.epd2.HEIGHT) - 200, 200, 200, false, mirror_y, true);
  delay(2000);
}
#endif

#ifdef _GxBitmaps104x212_H_
void drawBitmaps104x212()
{
#if !defined(__AVR)
  const unsigned char* bitmaps[] =
  {
    WS_Bitmap104x212, Bitmap104x212_1, Bitmap104x212_2, Bitmap104x212_3
  };
#else
  const unsigned char* bitmaps[] =
  {
    WS_Bitmap104x212, Bitmap104x212_1, Bitmap104x212_2, Bitmap104x212_3
  };
#endif
  if ((display.epd2.WIDTH == 104) && (display.epd2.HEIGHT == 212) && !display.epd2.hasColor)
  {
    for (uint16_t i = 0; i < sizeof(bitmaps) / sizeof(char*); i++)
    {
      display.firstPage();
      do
      {
        display.fillScreen(GxEPD_WHITE);
        display.drawBitmap(0, 0, bitmaps[i], 104, 212, GxEPD_BLACK);
      }
      while (display.nextPage());
      delay(2000);
    }
  }
}
#endif

#ifdef _GxBitmaps128x250_H_
void drawBitmaps128x250()
{
#if !defined(__AVR)
  const unsigned char* bitmaps[] =
  {
    Bitmap128x250_1, logo128x250, first128x250, second128x250, third128x250
  };
#else
  const unsigned char* bitmaps[] =
  {
    Bitmap128x250_1, logo128x250, first128x250, second128x250, third128x250
  };
#endif
  if ((display.epd2.WIDTH == 128) && (display.epd2.HEIGHT == 250) && !display.epd2.hasColor)
  {
    bool m = display.mirror(true);
    for (uint16_t i = 0; i < sizeof(bitmaps) / sizeof(char*); i++)
    {
      display.firstPage();
      do
      {
        display.fillScreen(GxEPD_WHITE);
        display.drawInvertedBitmap(0, 0, bitmaps[i], 128, 250, GxEPD_BLACK);
      }
      while (display.nextPage());
      delay(2000);
    }
    display.mirror(m);
  }
}
#endif

#ifdef _GxBitmaps128x296_H_
void drawBitmaps128x296()
{
#if !defined(__AVR)
  const unsigned char* bitmaps[] =
  {
    Bitmap128x296_1, logo128x296, first128x296, second128x296, third128x296
  };
#else
  const unsigned char* bitmaps[] =
  {
    Bitmap128x296_1, logo128x296 //, first128x296, second128x296, third128x296
  };
#endif
  if ((display.epd2.WIDTH == 128) && (display.epd2.HEIGHT == 296) && !display.epd2.hasColor)
  {
    bool m = display.mirror(true);
    for (uint16_t i = 0; i < sizeof(bitmaps) / sizeof(char*); i++)
    {
      display.firstPage();
      do
      {
        display.fillScreen(GxEPD_WHITE);
        display.drawInvertedBitmap(0, 0, bitmaps[i], 128, 296, GxEPD_BLACK);
      }
      while (display.nextPage());
      delay(2000);
    }
    display.mirror(m);
  }
}
#endif

#ifdef _GxBitmaps152x296_H_
void drawBitmaps152x296()
{
#if !defined(__AVR)
  const unsigned char* bitmaps[] =
  {
    Bitmap152x296_1, Bitmap152x296_2, Bitmap152x296_3
  };
#else
  const unsigned char* bitmaps[] =
  {
    Bitmap152x296_1, Bitmap152x296_2, Bitmap152x296_3
  };
#endif
  if ((display.epd2.WIDTH == 152) && (display.epd2.HEIGHT == 296) && !display.epd2.hasColor)
  {
    for (uint16_t i = 0; i < sizeof(bitmaps) / sizeof(char*); i++)
    {
      display.firstPage();
      do
      {
        display.fillScreen(GxEPD_WHITE);
        display.drawInvertedBitmap(0, 0, bitmaps[i], 152, 296, GxEPD_BLACK);
      }
      while (display.nextPage());
      delay(2000);
    }
  }
}
#endif

#ifdef _GxBitmaps176x264_H_
void drawBitmaps176x264()
{
#if !defined(__AVR)
  const unsigned char* bitmaps[] =
  {
    Bitmap176x264_1, Bitmap176x264_2, Bitmap176x264_3, Bitmap176x264_4, Bitmap176x264_5
  };
#else
  const unsigned char* bitmaps[] =
  {
    Bitmap176x264_1, Bitmap176x264_2 //, Bitmap176x264_3, Bitmap176x264_4, Bitmap176x264_5
  };
#endif
  if ((display.epd2.WIDTH == 176) && (display.epd2.HEIGHT == 264) && !display.epd2.hasColor)
  {
    for (uint16_t i = 0; i < sizeof(bitmaps) / sizeof(char*); i++)
    {
      display.firstPage();
      do
      {
        display.fillScreen(GxEPD_WHITE);
        display.drawInvertedBitmap(0, 0, bitmaps[i], 176, 264, GxEPD_BLACK);
      }
      while (display.nextPage());
      delay(2000);
    }
  }
}
#endif

#ifdef _GxBitmaps240x416_H_
void drawBitmaps240x416()
{
#if !defined(__AVR)
  const unsigned char* bitmaps[] =
  {
    Bitmap240x416_1, Bitmap240x416_2, Bitmap240x416_3
  };
#else
  const unsigned char* bitmaps[] =
  {
    Bitmap240x460_1, Bitmap240x460_2, Bitmap240x460_3
  };
#endif
  if ((display.epd2.WIDTH == 240) && (display.epd2.HEIGHT == 416) && !display.epd2.hasColor)
  {
    for (uint16_t i = 0; i < sizeof(bitmaps) / sizeof(char*); i++)
    {
      display.firstPage();
      do
      {
        display.fillScreen(GxEPD_WHITE);
        display.drawInvertedBitmap(0, 0, bitmaps[i], 240, 416, GxEPD_BLACK);
      }
      while (display.nextPage());
      delay(2000);
    }
  }
}
#endif

#ifdef _GxBitmaps400x300_H_
void drawBitmaps400x300()
{
#if !defined(__AVR)
  const unsigned char* bitmaps[] =
  {
    Bitmap400x300_1, Bitmap400x300_2
  };
#else
  const unsigned char* bitmaps[] = {}; // not enough code space
#endif
  if ((display.epd2.WIDTH == 400) && (display.epd2.HEIGHT == 300) && !display.epd2.hasColor)
  {
    for (uint16_t i = 0; i < sizeof(bitmaps) / sizeof(char*); i++)
    {
      display.firstPage();
      do
      {
        display.fillScreen(GxEPD_WHITE);
        display.drawInvertedBitmap(0, 0, bitmaps[i], 400, 300, GxEPD_BLACK);
      }
      while (display.nextPage());
      delay(2000);
    }
  }
}
#endif

#ifdef _GxBitmaps640x384_H_
void drawBitmaps640x384()
{
#if !defined(__AVR)
  const unsigned char* bitmaps[] =
  {
    Bitmap640x384_1, Bitmap640x384_2
  };
#else
  const unsigned char* bitmaps[] = {}; // not enough code space
#endif
  if ((display.epd2.WIDTH == 640) && (display.epd2.HEIGHT == 384))
  {
    for (uint16_t i = 0; i < sizeof(bitmaps) / sizeof(char*); i++)
    {
      display.firstPage();
      do
      {
        display.fillScreen(GxEPD_WHITE);
        display.drawInvertedBitmap(0, 0, bitmaps[i], 640, 384, GxEPD_BLACK);
      }
      while (display.nextPage());
      delay(2000);
    }
  }
}
#endif

#ifdef _GxBitmaps648x480_H_
void drawBitmaps648x480()
{
#if !defined(__AVR)
  const unsigned char* bitmaps[] =
  {
    Bitmap648x480_1, Bitmap648x480_2, Bitmap648x480_3
  };
#else
  const unsigned char* bitmaps[] = {}; // not enough code space
#endif
  if ((display.epd2.WIDTH == 648) && (display.epd2.HEIGHT == 480) && !display.epd2.hasColor)
  {
    for (uint16_t i = 0; i < sizeof(bitmaps) / sizeof(char*); i++)
    {
      display.firstPage();
      do
      {
        display.fillScreen(GxEPD_WHITE);
        display.drawBitmap(0, 0, bitmaps[i], 648, 480, GxEPD_BLACK);
      }
      while (display.nextPage());
      delay(2000);
    }
  }
}
#endif

#ifdef _GxBitmaps800x480_H_
void drawBitmaps800x480()
{
#if !defined(__AVR)
  const unsigned char* bitmaps[] =
  {
    Bitmap800x480_1, Bitmap800x480_2, Bitmap800x480_3, Bitmap800x480_4
  };
#else
  const unsigned char* bitmaps[] = {}; // not enough code space
#endif
  if ((display.epd2.WIDTH == 800) && (display.epd2.HEIGHT == 480))
  {
    for (uint16_t i = 0; i < sizeof(bitmaps) / sizeof(char*); i++)
    {
      display.firstPage();
      do
      {
        display.fillScreen(GxEPD_WHITE);
        display.drawBitmap(0, 0, bitmaps[i], 800, 480, GxEPD_BLACK);
      }
      while (display.nextPage());
      delay(2000);
    }
    if (display.epd2.panel == GxEPD2::GDEW075T7)
    {
      // avoid ghosting caused by OTP waveform
      display.clearScreen();
      display.refresh(false); // full update
    }
  }
}
#endif

#ifdef _WS_Bitmaps800x600_H_
void drawBitmaps800x600()
{
#if defined(ESP8266) || defined(ESP32)
  if (display.epd2.panel == GxEPD2::ED060SCT)
  {
    //    Serial.print("sizeof(WS_zoo_800x600) is "); Serial.println(sizeof(WS_zoo_800x600));
    display.drawNative(WS_zoo_800x600, 0, 0, 0, 800, 600, false, false, true);
    delay(2000);
    //    Serial.print("sizeof(WS_pic_1200x825) is "); Serial.println(sizeof(WS_pic_1200x825));
    //    display.drawNative((const uint8_t*)WS_pic_1200x825, 0, 0, 0, 1200, 825, false, false, true);
    //    delay(2000);
    //    Serial.print("sizeof(WS_acaa_1024x731) is "); Serial.println(sizeof(WS_acaa_1024x731));
    //    display.drawNative(WS_acaa_1024x731, 0, 0, 0, 1024, 731, false, false, true);
    //    delay(2000);
  }
#endif
}
#endif

#if defined(ESP32) && defined(_GxBitmaps1304x984_H_)
void drawBitmaps1304x984()
{
  if (display.epd2.panel == GxEPD2::GDEW1248T3)
  {
    display.drawImage(Bitmap1304x984, 0, 0, display.epd2.WIDTH, display.epd2.HEIGHT, false, false, true);
  }
}
#endif

struct bitmap_pair
{
  const unsigned char* black;
  const unsigned char* red;
};

#ifdef _GxBitmaps3c200x200_H_
void drawBitmaps3c200x200()
{
  bitmap_pair bitmap_pairs[] =
  {
    //{Bitmap3c200x200_black, Bitmap3c200x200_red},
    {WS_Bitmap3c200x200_black, WS_Bitmap3c200x200_red}
  };
  if (display.epd2.panel == GxEPD2::GDEW0154Z04)
  {
    display.firstPage();
    do
    {
      display.fillScreen(GxEPD_WHITE);
      // Bitmap3c200x200_black has 2 bits per pixel
      // taken from Adafruit_GFX.cpp, modified
      int16_t byteWidth = (display.epd2.WIDTH + 7) / 8; // Bitmap scanline pad = whole byte
      uint8_t byte = 0;
      for (int16_t j = 0; j < display.epd2.HEIGHT; j++)
      {
        for (int16_t i = 0; i < display.epd2.WIDTH; i++)
        {
          if (i & 3) byte <<= 2;
          else
          {
#if defined(__AVR) || defined(ESP8266) || defined(ESP32)
            byte = pgm_read_byte(&Bitmap3c200x200_black[j * byteWidth * 2 + i / 4]);
#else
            byte = Bitmap3c200x200_black[j * byteWidth * 2 + i / 4];
#endif
          }
          if (!(byte & 0x80))
          {
            display.drawPixel(i, j, GxEPD_BLACK);
          }
        }
      }
      display.drawInvertedBitmap(0, 0, Bitmap3c200x200_red, display.epd2.WIDTH, display.epd2.HEIGHT, GxEPD_RED);
    }
    while (display.nextPage());
    delay(2000);
    for (uint16_t i = 0; i < sizeof(bitmap_pairs) / sizeof(bitmap_pair); i++)
    {
      display.firstPage();
      do
      {
        display.fillScreen(GxEPD_WHITE);
        display.drawInvertedBitmap(0, 0, bitmap_pairs[i].black, display.epd2.WIDTH, display.epd2.HEIGHT, GxEPD_BLACK);
        display.drawInvertedBitmap(0, 0, bitmap_pairs[i].red, display.epd2.WIDTH, display.epd2.HEIGHT, GxEPD_RED);
      }
      while (display.nextPage());
      delay(2000);
    }
  }
  if (display.epd2.hasColor)
  {
    display.clearScreen(); // use default for white
    int16_t x = (int16_t(display.epd2.WIDTH) - 200) / 2;
    int16_t y = (int16_t(display.epd2.HEIGHT) - 200) / 2;
    for (uint16_t i = 0; i < sizeof(bitmap_pairs) / sizeof(bitmap_pair); i++)
    {
      display.drawImage(bitmap_pairs[i].black, bitmap_pairs[i].red, x, y, 200, 200, false, false, true);
      delay(2000);
    }
    for (uint16_t i = 0; i < sizeof(bitmap_pairs) / sizeof(bitmap_pair); i++)
    {
      int16_t x = -60;
      int16_t y = -60;
      for (uint16_t j = 0; j < 10; j++)
      {
        display.writeScreenBuffer(); // use default for white
        display.writeImage(bitmap_pairs[i].black, bitmap_pairs[i].red, x, y, 200, 200, false, false, true);
        display.refresh();
        delay(1000);
        x += display.epd2.WIDTH / 4;
        y += display.epd2.HEIGHT / 4;
        if ((x >= int16_t(display.epd2.WIDTH)) || (y >= int16_t(display.epd2.HEIGHT))) break;
      }
    }
    display.writeScreenBuffer(); // use default for white
    display.writeImage(bitmap_pairs[0].black, bitmap_pairs[0].red, 0, 0, 200, 200, false, false, true);
    display.writeImage(bitmap_pairs[0].black, bitmap_pairs[0].red, int16_t(display.epd2.WIDTH) - 200, int16_t(display.epd2.HEIGHT) - 200, 200, 200, false, false, true);
    display.refresh();
    delay(2000);
  }
}
#endif

#ifdef _GxBitmaps3c104x212_H_
void drawBitmaps3c104x212()
{
#if !defined(__AVR)
  bitmap_pair bitmap_pairs[] =
  {
    {Bitmap3c104x212_1_black, Bitmap3c104x212_1_red},
    {Bitmap3c104x212_2_black, Bitmap3c104x212_2_red},
    {WS_Bitmap3c104x212_black, WS_Bitmap3c104x212_red}
  };
#else
  bitmap_pair bitmap_pairs[] =
  {
    {Bitmap3c104x212_1_black, Bitmap3c104x212_1_red},
    //{Bitmap3c104x212_2_black, Bitmap3c104x212_2_red},
    {WS_Bitmap3c104x212_black, WS_Bitmap3c104x212_red}
  };
#endif
  if (display.epd2.panel == GxEPD2::GDEW0213Z16)
  {
    for (uint16_t i = 0; i < sizeof(bitmap_pairs) / sizeof(bitmap_pair); i++)
    {
      display.firstPage();
      do
      {
        display.fillScreen(GxEPD_WHITE);
        display.drawInvertedBitmap(0, 0, bitmap_pairs[i].black, display.epd2.WIDTH, display.epd2.HEIGHT, GxEPD_BLACK);
        if (bitmap_pairs[i].red == WS_Bitmap3c104x212_red)
        {
          display.drawInvertedBitmap(0, 0, bitmap_pairs[i].red, display.epd2.WIDTH, display.epd2.HEIGHT, GxEPD_RED);
        }
        else display.drawBitmap(0, 0, bitmap_pairs[i].red, display.epd2.WIDTH, display.epd2.HEIGHT, GxEPD_RED);
      }
      while (display.nextPage());
      delay(2000);
    }
  }
}
#endif

#ifdef _GxBitmaps3c128x296_H_
void drawBitmaps3c128x296()
{
#if !defined(__AVR)
  bitmap_pair bitmap_pairs[] =
  {
    {Bitmap3c128x296_1_black, Bitmap3c128x296_1_red},
    {Bitmap3c128x296_2_black, Bitmap3c128x296_2_red},
    {WS_Bitmap3c128x296_black, WS_Bitmap3c128x296_red}
  };
#else
  bitmap_pair bitmap_pairs[] =
  {
    //{Bitmap3c128x296_1_black, Bitmap3c128x296_1_red},
    //{Bitmap3c128x296_2_black, Bitmap3c128x296_2_red},
    {WS_Bitmap3c128x296_black, WS_Bitmap3c128x296_red}
  };
#endif
  if ((display.epd2.WIDTH == 128) && (display.epd2.HEIGHT == 296) && display.epd2.hasColor)
  {
    for (uint16_t i = 0; i < sizeof(bitmap_pairs) / sizeof(bitmap_pair); i++)
    {
      display.firstPage();
      do
      {
        display.fillScreen(GxEPD_WHITE);
        display.drawInvertedBitmap(0, 0, bitmap_pairs[i].black, 128, 296, GxEPD_BLACK);
        if (bitmap_pairs[i].red == WS_Bitmap3c128x296_red)
        {
          display.drawInvertedBitmap(0, 0, bitmap_pairs[i].red, 128, 296, GxEPD_RED);
        }
        else display.drawBitmap(0, 0, bitmap_pairs[i].red, 128, 296, GxEPD_RED);
      }
      while (display.nextPage());
      delay(2000);
    }
  }
}
#endif

#ifdef _GxBitmaps3c176x264_H_
void drawBitmaps3c176x264()
{
  bitmap_pair bitmap_pairs[] =
  {
    {Bitmap3c176x264_black, Bitmap3c176x264_red}
  };
  if (display.epd2.panel == GxEPD2::GDEW027C44)
  {
    for (uint16_t i = 0; i < sizeof(bitmap_pairs) / sizeof(bitmap_pair); i++)
    {
      display.firstPage();
      do
      {
        display.fillScreen(GxEPD_WHITE);
        display.drawBitmap(0, 0, bitmap_pairs[i].black, display.epd2.WIDTH, display.epd2.HEIGHT, GxEPD_BLACK);
        display.drawBitmap(0, 0, bitmap_pairs[i].red, display.epd2.WIDTH, display.epd2.HEIGHT, GxEPD_RED);
      }
      while (display.nextPage());
      delay(2000);
    }
  }
}
#endif

#ifdef _GxBitmaps3c400x300_H_
void drawBitmaps3c400x300()
{
#if !defined(__AVR)
  bitmap_pair bitmap_pairs[] =
  {
    {Bitmap3c400x300_1_black, Bitmap3c400x300_1_red},
    {Bitmap3c400x300_2_black, Bitmap3c400x300_2_red},
    {WS_Bitmap3c400x300_black, WS_Bitmap3c400x300_red}
  };
#else
  bitmap_pair bitmap_pairs[] = {}; // not enough code space
#endif
  if (display.epd2.panel == GxEPD2::GDEW042Z15)
  {
    for (uint16_t i = 0; i < sizeof(bitmap_pairs) / sizeof(bitmap_pair); i++)
    {
      display.firstPage();
      do
      {
        display.fillScreen(GxEPD_WHITE);
        display.drawInvertedBitmap(0, 0, bitmap_pairs[i].black, display.epd2.WIDTH, display.epd2.HEIGHT, GxEPD_BLACK);
        display.drawInvertedBitmap(0, 0, bitmap_pairs[i].red, display.epd2.WIDTH, display.epd2.HEIGHT, GxEPD_RED);
      }
      while (display.nextPage());
      delay(2000);
    }
  }
}
#endif

#ifdef _GxBitmaps3c800x480_H_
void drawBitmaps3c800x480()
{
#if !defined(__AVR)
  bitmap_pair bitmap_pairs[] =
  {
    {Bitmap3c800x480_1_black, Bitmap3c800x480_1_red}
  };
#else
  bitmap_pair bitmap_pairs[] = {}; // not enough code space
#endif
  if (display.epd2.panel == GxEPD2::GDEW075Z08)
  {
    for (uint16_t i = 0; i < sizeof(bitmap_pairs) / sizeof(bitmap_pair); i++)
    {
      display.firstPage();
      do
      {
        display.fillScreen(GxEPD_WHITE);
        display.drawBitmap(0, 0, bitmap_pairs[i].black, display.epd2.WIDTH, display.epd2.HEIGHT, GxEPD_BLACK);
        display.drawBitmap(0, 0, bitmap_pairs[i].red, display.epd2.WIDTH, display.epd2.HEIGHT, GxEPD_RED);
      }
      while (display.nextPage());
      delay(2000);
    }
  }
}
#endif

#ifdef _GxBitmaps3c880x528_H_
void drawBitmaps3c880x528()
{
#if !defined(__AVR)
  bitmap_pair bitmap_pairs[] =
  {
    {Bitmap3c880x528_black, Bitmap3c880x528_red}
  };
#else
  bitmap_pair bitmap_pairs[] = {}; // not enough code space
#endif
  if (display.epd2.panel == GxEPD2::GDEH075Z90)
  {
    bool m = display.mirror(true);
    for (uint16_t i = 0; i < sizeof(bitmap_pairs) / sizeof(bitmap_pair); i++)
    {
      display.firstPage();
      do
      {
        display.fillScreen(GxEPD_WHITE);
        display.drawInvertedBitmap(0, 0, bitmap_pairs[i].black, 880, 528, GxEPD_BLACK);
        display.drawInvertedBitmap(0, 0, bitmap_pairs[i].red, 880, 528, GxEPD_RED);
      }
      while (display.nextPage());
      delay(2000);
    }
    display.mirror(m);
  }
}
#endif

#if defined(_WS_Bitmaps7c192x143_H_)
void drawBitmaps7c192x143()
{
  if (display.epd2.panel == GxEPD2::ACeP565)
  {
    display.drawNative(WS_Bitmap7c192x143, 0, (display.epd2.WIDTH - 192) / 2, (display.epd2.HEIGHT - 143) / 2, 192, 143, false, false, true);
    delay(5000);
  }
}
#endif

void draw7colors()
{
  display.setRotation(0);
  uint16_t h = display.height() / 7;
  display.firstPage();
  do
  {
    display.fillRect(0, 0, display.width(), h, GxEPD_BLACK);
    display.fillRect(0, h, display.width(), h, GxEPD_WHITE);
    display.fillRect(0, 2 * h, display.width(), h, GxEPD_GREEN);
    display.fillRect(0, 3 * h, display.width(), h, GxEPD_BLUE);
    display.fillRect(0, 4 * h, display.width(), h, GxEPD_RED);
    display.fillRect(0, 5 * h, display.width(), h, GxEPD_YELLOW);
    display.fillRect(0, 6 * h, display.width(), h, GxEPD_ORANGE);
  }
  while (display.nextPage());
}

void draw7colorlines()
{
  display.setRotation(0);
  uint16_t h = 2;
  display.firstPage();
  do
  {
    uint16_t y = 0;
    do
    {
      display.fillRect(0, y, display.width(), h, GxEPD_BLACK); y += h;
      display.fillRect(0, y, display.width(), h, GxEPD_WHITE); y += h;
      display.fillRect(0, y, display.width(), h, GxEPD_GREEN); y += h;
      display.fillRect(0, y, display.width(), h, GxEPD_WHITE); y += h;
      display.fillRect(0, y, display.width(), h, GxEPD_BLUE); y += h;
      display.fillRect(0, y, display.width(), h, GxEPD_WHITE); y += h;
      display.fillRect(0, y, display.width(), h, GxEPD_RED); y += h;
      display.fillRect(0, y, display.width(), h, GxEPD_WHITE); y += h;
      display.fillRect(0, y, display.width(), h, GxEPD_YELLOW); y += h;
      display.fillRect(0, y, display.width(), h, GxEPD_WHITE); y += h;
      display.fillRect(0, y, display.width(), h, GxEPD_ORANGE); y += h;
      display.fillRect(0, y, display.width(), h, GxEPD_WHITE); y += h;
    }
    while ((y + 12 * h) < display.height());
    //display.drawPixel(0, y, GxEPD_BLACK); display.drawPixel(10, y, GxEPD_GREEN);
    //display.drawPixel(20, y, GxEPD_BLUE); display.drawPixel(30, y, GxEPD_RED);
    //display.drawPixel(40, y, GxEPD_YELLOW); display.drawPixel(50, y, GxEPD_ORANGE);
    display.fillRect(0, y, 2, 2, GxEPD_BLACK); display.fillRect(10, y, 2, 2, GxEPD_GREEN);
    display.fillRect(20, y, 2, 2, GxEPD_BLUE); display.fillRect(30, y, 2, 2, GxEPD_RED);
    display.fillRect(40, y, 2, 2, GxEPD_YELLOW); display.fillRect(50, y, 2, 2, GxEPD_ORANGE);
  }
  while (display.nextPage());
}

The only thing I changed here was display.init(115200, true, 2, false);

The output from the serial monitor looks like this:

⸮⸮⸮⸮⸮⸮ ⸮z,o⸮⸮ 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0018,len:4
load:0x3fff001c,len:1044
load:0x40078000,len:10124
load:0x40080400,len:5856
entry 0x400806a8

setup
⸮_PowerOn : 91001
_Update_Full : 91001
_Update_Part : 1
_Update_Full : 91001
_PowerOff : 233001
_PowerOn : 91001
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Full : 91001
_PowerOff : 233001
_PowerOn : 91001
_Update_Full : 91001
_PowerOff : 233001
_PowerOn : 91001
_Update_Full : 91001
_PowerOff : 233001
_PowerOn : 91001
_Update_Full : 91001
_PowerOff : 233001
_PowerOn : 91001
_Update_Full : 91001
_PowerOff : 233001
_PowerOn : 91001
_Update_Full : 91001
_PowerOff : 233001
_PowerOn : 91001
_Update_Full : 91001
_PowerOff : 233001
_PowerOn : 91001
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_Update_Part : 1
_PowerOff : 233001
_PowerOn : 91001
_Update_Full : 91001
_PowerOff : 233001
_PowerOff : 233001
_PowerOn : 91001
_Update_Full : 91001
_PowerOff : 233001
_PowerOn : 91001
_Update_Full : 91001
_PowerOff : 233001
_PowerOff : 233001
Busy Timeout!
_PowerOff : 10001015
setup done

@vanilla_chief

Try uncommenting this line:

#define GxEPD2_DRIVER_CLASS GxEPD2_290_T94 // GDEM029T94  128x296
1 Like

nice, it worked! Thank you!!!

1 Like

has been falsified by @vanilla_chief, thanks!

1 Like