zGxEPD2/examples/GxEPD2_Example/GxEPD2_Example.ino

// Display Library example 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!
//
// 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 Dispay ePaper for Arduino: https://forum.arduino.cc/index.php?topic=436411.0

// mapping suggestion from Waveshare SPI e-Paper to Wemos D1 mini
// BUSY -> D2, RST -> D4, DC -> D3, CS -> D8, CLK -> D5, DIN -> D7, GND -> GND, 3.3V -> 3.3V
// NOTE for ESP8266: using SS (GPIO15) for CS may cause boot mode problems, use different pin in case

// mapping suggestion from Waveshare SPI e-Paper to generic ESP8266
// BUSY -> GPIO4, RST -> GPIO2, DC -> GPIO0, CS -> GPIO15, CLK -> GPIO14, DIN -> GPIO13, GND -> GND, 3.3V -> 3.3V
// NOTE for ESP8266: using SS (GPIO15) for CS may cause boot mode problems, use different pin in case

// mapping of Waveshare e-Paper ESP8266 Driver Board
// BUSY -> GPIO16, RST -> GPIO5, DC -> GPIO4, CS -> GPIO15, CLK -> GPIO14, DIN -> GPIO13, GND -> GND, 3.3V -> 3.3V
// NOTE for ESP8266: using SS (GPIO15) for CS may cause boot mode problems, use different pin in case

// 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

// new mapping suggestion for STM32F1, e.g. STM32F103C8T6 "BluePill"
// BUSY -> A1, RST -> A2, DC -> A3, CS-> A4, CLK -> A5, DIN -> A7

// mapping suggestion for AVR, UNO, NANO etc.
// BUSY -> 7, RST -> 9, DC -> 8, CS-> 10, CLK -> 13, DIN -> 11

// mapping of Waveshare Universal e-Paper Raw Panel Driver Shield for Arduino / NUCLEO
// BUSY -> 7, RST -> 8, DC -> 9, CS-> 10, CLK -> 13, DIN -> 11

// mapping suggestion for Arduino MEGA
// BUSY -> 7, RST -> 9, DC -> 8, CS-> 53, CLK -> 52, DIN -> 51

// 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

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

#if defined (ESP8266)
// select one and adapt to your mapping, can use full buffer size (full HEIGHT)
//GxEPD2_BW<GxEPD2_154, GxEPD2_154::HEIGHT> display(GxEPD2_154(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4));
//GxEPD2_BW<GxEPD2_213, GxEPD2_213::HEIGHT> display(GxEPD2_213(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4)); // GDE0213B1, phased out
//GxEPD2_BW<GxEPD2_213_B72, GxEPD2_213_B72::HEIGHT> display(GxEPD2_213_B72(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4)); // GDEH0213B72
//GxEPD2_BW<GxEPD2_213_flex, GxEPD2_213_flex::HEIGHT> display(GxEPD2_213_flex(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4)); // GDEW0213I5F
//GxEPD2_BW<GxEPD2_290, GxEPD2_290::HEIGHT> display(GxEPD2_290(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4));
//GxEPD2_BW<GxEPD2_290_T5, GxEPD2_290_T5::HEIGHT> display(GxEPD2_290_T5(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4)); // GDEW029T5
//GxEPD2_BW<GxEPD2_270, GxEPD2_270::HEIGHT> display(GxEPD2_270(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4));
//GxEPD2_BW<GxEPD2_420, GxEPD2_420::HEIGHT> display(GxEPD2_420(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4));
// can use only half buffer size
//GxEPD2_BW < GxEPD2_583, GxEPD2_583::HEIGHT / 2 > display(GxEPD2_583(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4));
//GxEPD2_BW < GxEPD2_750, GxEPD2_750::HEIGHT / 2 > display(GxEPD2_750(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4));
// 3-color e-papers
//GxEPD2_3C<GxEPD2_154c, GxEPD2_154c::HEIGHT> display(GxEPD2_154c(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4));
//GxEPD2_3C<GxEPD2_213c, GxEPD2_213c::HEIGHT> display(GxEPD2_213c(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4));
//GxEPD2_3C<GxEPD2_290c, GxEPD2_290c::HEIGHT> display(GxEPD2_290c(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4));
//GxEPD2_3C<GxEPD2_270c, GxEPD2_270c::HEIGHT> display(GxEPD2_270c(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4));
// can use only half buffer size
//GxEPD2_3C<GxEPD2_420c, GxEPD2_420c::HEIGHT / 2> display(GxEPD2_420c(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4));
// can use only quarter buffer size
//GxEPD2_3C < GxEPD2_583c, GxEPD2_583c::HEIGHT / 4 > display(GxEPD2_583c(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4));
//GxEPD2_3C<GxEPD2_750c, GxEPD2_750c::HEIGHT / 4> display(GxEPD2_750c(/*CS=D8*/ SS, /*DC=D3*/ 0, /*RST=D4*/ 2, /*BUSY=D2*/ 4));
// grey levels parallel IF e-papers on Waveshare e-Paper IT8951 Driver HAT
// HRDY -> 4, RST -> 2, CS -> SS(15), SCK -> SCK(14), MOSI -> MOSI(D7(13)), MISO -> MISO(D6(12)), GND -> GND, 5V -> 5V
// note: 5V supply needs to be exact and strong; 5V pin of USB powered Wemos D1 mini doesn't work!
//GxEPD2_BW<GxEPD2_it60, GxEPD2_it60::HEIGHT / 8> display(GxEPD2_it60(/*CS=5*/ SS, /*DC=*/ 0, /*RST=*/ 2, /*BUSY=*/ 4));

// ***** for mapping of Waveshare e-Paper ESP8266 Driver Board *****
// select one , can use full buffer size (full HEIGHT)
//GxEPD2_BW<GxEPD2_154, GxEPD2_154::HEIGHT> display(GxEPD2_154(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=5*/ 5, /*BUSY=16*/ 16));
//GxEPD2_BW<GxEPD2_213, GxEPD2_213::HEIGHT> display(GxEPD2_213(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=5*/ 5, /*BUSY=16*/ 16)); // GDE0213B1, phased out
//GxEPD2_BW<GxEPD2_213_B72, GxEPD2_213_B72::HEIGHT> display(GxEPD2_213_B72(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=5*/ 5, /*BUSY=16*/ 16)); // GDEH0213B72
//GxEPD2_BW<GxEPD2_213_flex, GxEPD2_213_flex::HEIGHT> display(GxEPD2_213_flex(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=5*/ 5, /*BUSY=16*/ 16)); // GDEW0213I5F
//GxEPD2_BW<GxEPD2_290, GxEPD2_290::HEIGHT> display(GxEPD2_290(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=5*/ 5, /*BUSY=16*/ 16));
//GxEPD2_BW<GxEPD2_290_T5, GxEPD2_290_T5::HEIGHT> display(GxEPD2_290_T5(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=5*/ 5, /*BUSY=16*/ 16)); // GDEW029T5
//GxEPD2_BW<GxEPD2_270, GxEPD2_270::HEIGHT> display(GxEPD2_270(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=5*/ 5, /*BUSY=16*/ 16));
//GxEPD2_BW<GxEPD2_420, GxEPD2_420::HEIGHT> display(GxEPD2_420(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=5*/ 5, /*BUSY=16*/ 16));
// can use only half buffer size
//GxEPD2_BW < GxEPD2_583, GxEPD2_583::HEIGHT / 2 > display(GxEPD2_583(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=5*/ 5, /*BUSY=16*/ 16));
//GxEPD2_BW < GxEPD2_750, GxEPD2_750::HEIGHT / 2 > display(GxEPD2_750(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=5*/ 5, /*BUSY=16*/ 16));
// 3-color e-papers
//GxEPD2_3C<GxEPD2_154c, GxEPD2_154c::HEIGHT> display(GxEPD2_154c(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=5*/ 5, /*BUSY=16*/ 16));
//GxEPD2_3C<GxEPD2_213c, GxEPD2_213c::HEIGHT> display(GxEPD2_213c(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=5*/ 5, /*BUSY=16*/ 16));
//GxEPD2_3C<GxEPD2_290c, GxEPD2_290c::HEIGHT> display(GxEPD2_290c(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=5*/ 5, /*BUSY=16*/ 16));
//GxEPD2_3C<GxEPD2_270c, GxEPD2_270c::HEIGHT> display(GxEPD2_270c(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=5*/ 5, /*BUSY=16*/ 16));
// can use only half buffer size
//GxEPD2_3C<GxEPD2_420c, GxEPD2_420c::HEIGHT / 2> display(GxEPD2_420c(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=5*/ 5, /*BUSY=16*/ 16));
// can use only quarter buffer size
//GxEPD2_3C<GxEPD2_583c, GxEPD2_583c::HEIGHT / 4> display(GxEPD2_583c(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=5*/ 5, /*BUSY=16*/ 16));
//GxEPD2_3C<GxEPD2_750c, GxEPD2_750c::HEIGHT / 4> display(GxEPD2_750c(/*CS=15*/ SS, /*DC=4*/ 4, /*RST=5*/ 5, /*BUSY=16*/ 16));
#endif

#if defined(ESP32)
// select one and adapt to your mapping, can use full buffer size (full HEIGHT)
//GxEPD2_BW<GxEPD2_154, GxEPD2_154::HEIGHT> display(GxEPD2_154(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4));
//GxEPD2_BW<GxEPD2_213, GxEPD2_213::HEIGHT> display(GxEPD2_213(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4)); // GDE0213B1, phased out
//GxEPD2_BW<GxEPD2_213_B72, GxEPD2_213_B72::HEIGHT> display(GxEPD2_213_B72(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4)); // GDEH0213B72
//GxEPD2_BW<GxEPD2_213_flex, GxEPD2_213_flex::HEIGHT> display(GxEPD2_213_flex(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4)); // GDEW0213I5F
//GxEPD2_BW<GxEPD2_290, GxEPD2_290::HEIGHT> display(GxEPD2_290(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4));
//GxEPD2_BW<GxEPD2_290_T5, GxEPD2_290_T5::HEIGHT> display(GxEPD2_290_T5(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4)); // GDEW029T5
//GxEPD2_BW<GxEPD2_270, GxEPD2_270::HEIGHT> display(GxEPD2_270(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4));
//GxEPD2_BW<GxEPD2_420, GxEPD2_420::HEIGHT> display(GxEPD2_420(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4));
//GxEPD2_BW<GxEPD2_583, GxEPD2_583::HEIGHT> display(GxEPD2_583(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4));
//GxEPD2_BW<GxEPD2_750, GxEPD2_750::HEIGHT> display(GxEPD2_750(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4));
// 3-color e-papers
//GxEPD2_3C<GxEPD2_154c, GxEPD2_154c::HEIGHT> display(GxEPD2_154c(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4));
//GxEPD2_3C<GxEPD2_213c, GxEPD2_213c::HEIGHT> display(GxEPD2_213c(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4));
//GxEPD2_3C<GxEPD2_290c, GxEPD2_290c::HEIGHT> display(GxEPD2_290c(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4));
//GxEPD2_3C<GxEPD2_270c, GxEPD2_270c::HEIGHT> display(GxEPD2_270c(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4));
//GxEPD2_3C<GxEPD2_420c, GxEPD2_420c::HEIGHT> display(GxEPD2_420c(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4));
//GxEPD2_3C<GxEPD2_583c, GxEPD2_583c::HEIGHT> display(GxEPD2_583c(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4));
//GxEPD2_3C<GxEPD2_750c, GxEPD2_750c::HEIGHT> display(GxEPD2_750c(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4));
// grey levels parallel IF e-papers on Waveshare e-Paper IT8951 Driver HAT
// HRDY -> 4, RST -> 16, CS -> SS(5), SCK -> SCK(18), MOSI -> MOSI(23), MISO -> MISO(19), GND -> GND, 5V -> 5V
// note: 5V supply needs to be exact and strong; 5V over diode from USB (e.g. Wemos D1 mini) doesn't work!
//GxEPD2_BW<GxEPD2_it60, GxEPD2_it60::HEIGHT> display(GxEPD2_it60(/*CS=5*/ SS, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4));
#endif

#if defined(_BOARD_GENERIC_STM32F103C_H_)
#define MAX_DISPAY_BUFFER_SIZE 15000ul // ~15k is a good compromise
#define MAX_HEIGHT(EPD) (EPD::HEIGHT <= MAX_DISPAY_BUFFER_SIZE / (EPD::WIDTH / 8) ? EPD::HEIGHT : MAX_DISPAY_BUFFER_SIZE / (EPD::WIDTH / 8))
// select one and adapt to your mapping
//GxEPD2_BW<GxEPD2_154, MAX_HEIGHT(GxEPD2_154)> display(GxEPD2_154(/*CS=4*/ SS, /*DC=*/ 3, /*RST=*/ 2, /*BUSY=*/ 1));
//GxEPD2_BW<GxEPD2_213, MAX_HEIGHT(GxEPD2_213)> display(GxEPD2_213(/*CS=4*/ SS, /*DC=*/ 3, /*RST=*/ 2, /*BUSY=*/ 1)); // GDE0213B1, phased out
//GxEPD2_BW<GxEPD2_213_B72, MAX_HEIGHT(GxEPD2_213_B72)> display(GxEPD2_213_B72(/*CS=4*/ SS, /*DC=*/ 3, /*RST=*/ 2, /*BUSY=*/ 1)); // GDEH0213B72
//GxEPD2_BW<GxEPD2_213_flex, MAX_HEIGHT(GxEPD2_213_flex)> display(GxEPD2_213_flex(/*CS=4*/ SS, /*DC=*/ 3, /*RST=*/ 2, /*BUSY=*/ 1)); // GDEW0213I5F
//GxEPD2_BW<GxEPD2_290, MAX_HEIGHT(GxEPD2_290)> display(GxEPD2_290(/*CS=4*/ SS, /*DC=*/ 3, /*RST=*/ 2, /*BUSY=*/ 1));
//GxEPD2_BW<GxEPD2_290_T5, MAX_HEIGHT(GxEPD2_290_T5)> display(GxEPD2_290_T5(/*CS=4*/ SS, /*DC=*/ 3, /*RST=*/ 2, /*BUSY=*/ 1)); // GDEW029T5
//GxEPD2_BW<GxEPD2_270, MAX_HEIGHT(GxEPD2_270)> display(GxEPD2_270(/*CS=4*/ SS, /*DC=*/ 3, /*RST=*/ 2, /*BUSY=*/ 1));
//GxEPD2_BW<GxEPD2_420, MAX_HEIGHT(GxEPD2_420)> display(GxEPD2_420(/*CS=4*/ SS, /*DC=*/ 3, /*RST=*/ 2, /*BUSY=*/ 1));
//GxEPD2_BW<GxEPD2_583, MAX_HEIGHT(GxEPD2_583)> display(GxEPD2_583(/*CS=4*/ SS, /*DC=*/ 3, /*RST=*/ 2, /*BUSY=*/ 1));
//GxEPD2_BW<GxEPD2_750, MAX_HEIGHT(GxEPD2_750)> display(GxEPD2_750(/*CS=4*/ SS, /*DC=*/ 3, /*RST=*/ 2, /*BUSY=*/ 1));
// 3-color e-papers
#define MAX_HEIGHT_3C(EPD) (EPD::HEIGHT <= (MAX_DISPAY_BUFFER_SIZE / 2) / (EPD::WIDTH / 8) ? EPD::HEIGHT : (MAX_DISPAY_BUFFER_SIZE / 2) / (EPD::WIDTH / 8))
//GxEPD2_3C<GxEPD2_154c, MAX_HEIGHT_3C(GxEPD2_154c)> display(GxEPD2_154c(/*CS=4*/ SS, /*DC=*/ 3, /*RST=*/ 2, /*BUSY=*/ 1));
//GxEPD2_3C<GxEPD2_213c, MAX_HEIGHT_3C(GxEPD2_213c)> display(GxEPD2_213c(/*CS=4*/ SS, /*DC=*/ 3, /*RST=*/ 2, /*BUSY=*/ 1));
//GxEPD2_3C<GxEPD2_290c, MAX_HEIGHT_3C(GxEPD2_290c)> display(GxEPD2_290c(/*CS=4*/ SS, /*DC=*/ 3, /*RST=*/ 2, /*BUSY=*/ 1));
//GxEPD2_3C<GxEPD2_270c, MAX_HEIGHT_3C(GxEPD2_270c)> display(GxEPD2_270c(/*CS=4*/ SS, /*DC=*/ 3, /*RST=*/ 2, /*BUSY=*/ 1));
//GxEPD2_3C<GxEPD2_420c, MAX_HEIGHT_3C(GxEPD2_420c)> display(GxEPD2_420c(/*CS=4*/ SS, /*DC=*/ 3, /*RST=*/ 2, /*BUSY=*/ 1));
//GxEPD2_3C<GxEPD2_583c, MAX_HEIGHT_3C(GxEPD2_583c)> display(GxEPD2_583c(/*CS=4*/ SS, /*DC=*/ 3, /*RST=*/ 2, /*BUSY=*/ 1));
//GxEPD2_3C<GxEPD2_750c, MAX_HEIGHT_3C(GxEPD2_750c)> display(GxEPD2_750c(/*CS=4*/ SS, /*DC=*/ 3, /*RST=*/ 2, /*BUSY=*/ 1));
#endif

#if defined(__AVR)
#define MAX_DISPAY_BUFFER_SIZE 800 // 
#define MAX_HEIGHT(EPD) (EPD::HEIGHT <= MAX_DISPAY_BUFFER_SIZE / (EPD::WIDTH / 8) ? EPD::HEIGHT : MAX_DISPAY_BUFFER_SIZE / (EPD::WIDTH / 8))
// select one and adapt to your mapping
//GxEPD2_BW<GxEPD2_154, MAX_HEIGHT(GxEPD2_154)> display(GxEPD2_154(/*CS=10*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
//GxEPD2_BW<GxEPD2_213, MAX_HEIGHT(GxEPD2_213)> display(GxEPD2_213(/*CS=10*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7)); // GDE0213B1, phased out
//GxEPD2_BW<GxEPD2_213_B72, MAX_HEIGHT(GxEPD2_213_B72)> display(GxEPD2_213_B72(/*CS=10*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7)); // GDEH0213B72
//GxEPD2_BW<GxEPD2_213_flex, MAX_HEIGHT(GxEPD2_213_flex)> display(GxEPD2_213_flex(/*CS=10*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7)); // GDEW0213I5F
//GxEPD2_BW<GxEPD2_290, MAX_HEIGHT(GxEPD2_290)> display(GxEPD2_290(/*CS=10*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
//GxEPD2_BW<GxEPD2_290_T5, MAX_HEIGHT(GxEPD2_290_T5)> display(GxEPD2_290_T5(/*CS=10*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7)); // GDEW029T5
//GxEPD2_BW<GxEPD2_270, MAX_HEIGHT(GxEPD2_270)> display(GxEPD2_270(/*CS=10*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
//GxEPD2_BW<GxEPD2_420, MAX_HEIGHT(GxEPD2_420)> display(GxEPD2_420(/*CS=10*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
//GxEPD2_BW<GxEPD2_583, MAX_HEIGHT(GxEPD2_583)> display(GxEPD2_583(/*CS=10*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
//GxEPD2_BW<GxEPD2_750, MAX_HEIGHT(GxEPD2_750)> display(GxEPD2_750(/*CS=10*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
// 3-color e-papers
#define MAX_HEIGHT_3C(EPD) (EPD::HEIGHT <= (MAX_DISPAY_BUFFER_SIZE / 2) / (EPD::WIDTH / 8) ? EPD::HEIGHT : (MAX_DISPAY_BUFFER_SIZE / 2) / (EPD::WIDTH / 8))
//GxEPD2_3C<GxEPD2_154c, MAX_HEIGHT_3C(GxEPD2_154c)> display(GxEPD2_154c(/*CS=10*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
//GxEPD2_3C<GxEPD2_213c, MAX_HEIGHT_3C(GxEPD2_213c)> display(GxEPD2_213c(/*CS=10*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
//GxEPD2_3C<GxEPD2_290c, MAX_HEIGHT_3C(GxEPD2_290c)> display(GxEPD2_290c(/*CS=10*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
//GxEPD2_3C<GxEPD2_270c, MAX_HEIGHT_3C(GxEPD2_270c)> display(GxEPD2_270c(/*CS=10*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
//GxEPD2_3C<GxEPD2_420c, MAX_HEIGHT_3C(GxEPD2_420c)> display(GxEPD2_420c(/*CS=10*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
//GxEPD2_3C<GxEPD2_583c, MAX_HEIGHT_3C(GxEPD2_583c)> display(GxEPD2_583c(/*CS=10*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
//GxEPD2_3C<GxEPD2_750c, MAX_HEIGHT_3C(GxEPD2_750c)> display(GxEPD2_750c(/*CS=10*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));

// ***** for mapping of Waveshare Universal e-Paper Raw Panel Driver Shield for Arduino / NUCLEO *****
// the RST line is not connected through level converter, but has a pull up resistor and a pull down diode to the Arduino pin; this is safe for 5V Arduino
// NOTE: the 11-pinholes for pin connectors are not through level converter, and the VCC pin is 5V, only FCP connector pins are through level converter
// select one and adapt to your mapping
//GxEPD2_BW<GxEPD2_154, MAX_HEIGHT(GxEPD2_154)> display(GxEPD2_154(/*CS=10*/ SS, /*DC=*/ 9, /*RST=*/ 8, /*BUSY=*/ 7));
//GxEPD2_BW<GxEPD2_213, MAX_HEIGHT(GxEPD2_213)> display(GxEPD2_213(/*CS=10*/ SS, /*DC=*/ 9, /*RST=*/ 8, /*BUSY=*/ 7)); // GDE0213B1, phased out
//GxEPD2_BW<GxEPD2_213_B72, MAX_HEIGHT(GxEPD2_213_B72)> display(GxEPD2_213_B72(/*CS=10*/ SS, /*DC=*/ 9, /*RST=*/ 8, /*BUSY=*/ 7)); // GDEH0213B72
//GxEPD2_BW<GxEPD2_213_flex, MAX_HEIGHT(GxEPD2_213_flex)> display(GxEPD2_213_flex(/*CS=10*/ SS, /*DC=*/ 9, /*RST=*/ 8, /*BUSY=*/ 7)); // GDEW0213I5F
//GxEPD2_BW<GxEPD2_290, MAX_HEIGHT(GxEPD2_290)> display(GxEPD2_290(/*CS=10*/ SS, /*DC=*/ 9, /*RST=*/ 8, /*BUSY=*/ 7));
//GxEPD2_BW<GxEPD2_290_T5, MAX_HEIGHT(GxEPD2_290_T5)> display(GxEPD2_290_T5(/*CS=10*/ SS, /*DC=*/ 9, /*RST=*/ 8, /*BUSY=*/ 7)); // GDEW029T5
//GxEPD2_BW<GxEPD2_270, MAX_HEIGHT(GxEPD2_270)> display(GxEPD2_270(/*CS=10*/ SS, /*DC=*/ 9, /*RST=*/ 8, /*BUSY=*/ 7));
//GxEPD2_BW<GxEPD2_420, MAX_HEIGHT(GxEPD2_420)> display(GxEPD2_420(/*CS=10*/ SS, /*DC=*/ 9, /*RST=*/ 8, /*BUSY=*/ 7));
//GxEPD2_BW<GxEPD2_583, MAX_HEIGHT(GxEPD2_583)> display(GxEPD2_583(/*CS=10*/ SS, /*DC=*/ 9, /*RST=*/ 8, /*BUSY=*/ 7));
//GxEPD2_BW<GxEPD2_750, MAX_HEIGHT(GxEPD2_750)> display(GxEPD2_750(/*CS=10*/ SS, /*DC=*/ 9, /*RST=*/ 8, /*BUSY=*/ 7));
// 3-color e-papers
#define MAX_HEIGHT_3C(EPD) (EPD::HEIGHT <= (MAX_DISPAY_BUFFER_SIZE / 2) / (EPD::WIDTH / 8) ? EPD::HEIGHT : (MAX_DISPAY_BUFFER_SIZE / 2) / (EPD::WIDTH / 8))
//GxEPD2_3C<GxEPD2_154c, MAX_HEIGHT_3C(GxEPD2_154c)> display(GxEPD2_154c(/*CS=10*/ SS, /*DC=*/ 9, /*RST=*/ 8, /*BUSY=*/ 7));
//GxEPD2_3C<GxEPD2_213c, MAX_HEIGHT_3C(GxEPD2_213c)> display(GxEPD2_213c(/*CS=10*/ SS, /*DC=*/ 9, /*RST=*/ 8, /*BUSY=*/ 7));
//GxEPD2_3C<GxEPD2_290c, MAX_HEIGHT_3C(GxEPD2_290c)> display(GxEPD2_290c(/*CS=10*/ SS, /*DC=*/ 9, /*RST=*/ 8, /*BUSY=*/ 7));
//GxEPD2_3C<GxEPD2_270c, MAX_HEIGHT_3C(GxEPD2_270c)> display(GxEPD2_270c(/*CS=10*/ SS, /*DC=*/ 9, /*RST=*/ 8, /*BUSY=*/ 7));
//GxEPD2_3C<GxEPD2_420c, MAX_HEIGHT_3C(GxEPD2_420c)> display(GxEPD2_420c(/*CS=10*/ SS, /*DC=*/ 9, /*RST=*/ 8, /*BUSY=*/ 7));
//GxEPD2_3C<GxEPD2_583c, MAX_HEIGHT_3C(GxEPD2_583c)> display(GxEPD2_583c(/*CS=10*/ SS, /*DC=*/ 9, /*RST=*/ 8, /*BUSY=*/ 7));
//GxEPD2_3C<GxEPD2_750c, MAX_HEIGHT_3C(GxEPD2_750c)> display(GxEPD2_750c(/*CS=10*/ SS, /*DC=*/ 9, /*RST=*/ 8, /*BUSY=*/ 7));
#endif

#include "GxEPD2_boards_added.h"
//#include "GxEPD2_more_boards_added.h" // private

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

// comment out unused bitmaps to reduce code space used
#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
#include "bitmaps/Bitmaps640x384.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/WS_Bitmaps800x600.h" // 6.0"  grey
#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);
  // 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 (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();
  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 _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 _WS_Bitmaps800x600_H_
  drawBitmaps800x600();
#endif
  // 3-color
#ifdef _GxBitmaps3c104x212_H_
  drawBitmaps3c104x212();
#endif
#ifdef _GxBitmaps3c128x296_H_
  drawBitmaps3c128x296();
#endif
#ifdef _GxBitmaps3c176x264_H_
  drawBitmaps3c176x264();
#endif
#ifdef _GxBitmaps3c400x300_H_
  drawBitmaps3c400x300();
#endif
  // show these after the specific bitmaps
#ifdef _GxBitmaps200x200_H_
  drawBitmaps200x200();
#endif
  // 3-color
#ifdef _GxBitmaps3c200x200_H_
  drawBitmaps3c200x200();
#endif
}

#ifdef _GxBitmaps200x200_H_
void drawBitmaps200x200()
{
#if defined(__AVR)
  const unsigned char* bitmaps[] =
  {
    logo200x200, first200x200 //, second200x200, third200x200, fourth200x200, fifth200x200, sixth200x200, senventh200x200, eighth200x200
  };
#elif defined(_BOARD_GENERIC_STM32F103C_H_)
  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.panel == GxEPD2::GDEP015OC1)
  {
    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], display.epd2.WIDTH, display.epd2.HEIGHT, 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 += 40;
      y += 40;
      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);
  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.panel == GxEPD2::GDEW0213I5F)
  {
    for (uint16_t i = 0; i < sizeof(bitmaps) / sizeof(char*); i++)
    {
      display.firstPage();
      do
      {
        display.fillScreen(GxEPD_WHITE);
        display.drawBitmap(0, 0, bitmaps[i], display.epd2.WIDTH, display.epd2.HEIGHT, 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.panel == GxEPD2::GDE0213B1) || (display.epd2.panel == GxEPD2::GDEH0213B72))
  {
    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], display.epd2.WIDTH, display.epd2.HEIGHT, 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.panel == GxEPD2::GDEH029A1)
  {
    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], display.epd2.WIDTH, display.epd2.HEIGHT, GxEPD_BLACK);
      }
      while (display.nextPage());
      delay(2000);
    }
    display.mirror(m);
  }
}
#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.panel == GxEPD2::GDEW027W3)
  {
    for (uint16_t i = 0; i < sizeof(bitmaps) / sizeof(char*); i++)
    {
      display.firstPage();
      do
      {
        display.fillScreen(GxEPD_WHITE);
        display.drawInvertedBitmap(0, 0, bitmaps[i], display.epd2.WIDTH, display.epd2.HEIGHT, 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.panel == GxEPD2::GDEW042T2)
  {
    for (uint16_t i = 0; i < sizeof(bitmaps) / sizeof(char*); i++)
    {
      display.firstPage();
      do
      {
        display.fillScreen(GxEPD_WHITE);
        display.drawInvertedBitmap(0, 0, bitmaps[i], display.epd2.WIDTH, display.epd2.HEIGHT, 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.panel == GxEPD2::GDEW075T8) || (display.epd2.panel == GxEPD2::GDEW075Z09))
  {
    for (uint16_t i = 0; i < sizeof(bitmaps) / sizeof(char*); i++)
    {
      display.firstPage();
      do
      {
        display.fillScreen(GxEPD_WHITE);
        display.drawInvertedBitmap(0, 0, bitmaps[i], display.epd2.WIDTH, display.epd2.HEIGHT, GxEPD_BLACK);
      }
      while (display.nextPage());
      delay(2000);
    }
  }
}
#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

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 += 40;
        y += 40;
        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.panel == GxEPD2::GDEW029Z10)
  {
    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_Bitmap3c128x296_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 _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