Salve,
è da un po' di tempo che sto usando il mio Arduino MEGA2560 per sperimentare con lo schermo E-ink di Waveshare da 1.54 pollici. Non riesco a capire come mai, anche con il codice esempio della libreria GxEPD alcune immagini riesce a visualizzarle intere e altre le visualizza solo per un quarto.
Ecco il codice che sto usando in allegato:
// mapping suggestion for Arduino MEGA
// BUSY -> 7, RST -> 9, DC -> 8, CS-> 53, CLK -> 52, DIN -> 51
// include library, include base class, make path known
#include <GxEPD.h>
// select the display class to use, only one
#include <GxGDEP015OC1/GxGDEP015OC1.h> // 1.54" b/w
#include <GxIO/GxIO_SPI/GxIO_SPI.h>
#include <GxIO/GxIO.h>
// FreeFonts from Adafruit_GFX
#include <Fonts/FreeMonoBold9pt7b.h>
#include <Fonts/FreeSansOblique9pt7b.h>
#include "Image.h"
#include GxEPD_BitmapExamples
#if defined(ARDUINO_AVR_MEGA2560)
// for SPI pin definitions see e.g.:
// C:\Users\xxx\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.21\variants\mega\pins_arduino.h
// select one, depending on your CS connection
GxIO_Class io(SPI, /*CS=*/ SS, /*DC=*/ 8, /*RST=*/ 9); // arbitrary selection of 8, 9 selected for default of GxEPD_Class
//GxIO_Class io(SPI, /*CS=*/ 10, /*DC=*/ 8, /*RST=*/ 9); // arbitrary selection of 8, 9, CS on 10 (for CS same as on UNO, for SPI on ICSP use)
GxEPD_Class display(io, /*RST=*/ 9, /*BUSY=*/ 7); // default selection of (9), 7
#else
// for SPI pin definitions see e.g.:
// C:\Users\xxx\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.6.21\variants\standard\pins_arduino.h
GxIO_Class io(SPI, /*CS=*/ SS, /*DC=*/ 8, /*RST=*/ 9); // arbitrary selection of 8, 9 selected for default of GxEPD_Class
GxEPD_Class display(io, /*RST=*/ 9, /*BUSY=*/ 7); // default selection of (9), 7
#endif
//#define DEMO_DELAY 3*60 // seconds
//#define DEMO_DELAY 1*60 // seconds
#define DEMO_DELAY 5
void setup(void)
{
Serial.begin(115200);
Serial.println();
Serial.println("setup");
display.init(115200); // enable diagnostic output on Serial
Serial.println("setup done");
}
void loop()
{
uint8_t x = (display.width() - 64) / 2;
uint8_t y = 5;
display.fillScreen(GxEPD_WHITE);
display.drawExampleBitmap(gImage_test, x, y, 64, 180, GxEPD_BLACK);
display.update();
delay(500);
uint16_t forward = GxEPD::bm_invert | GxEPD::bm_flip_x;
uint16_t reverse = GxEPD::bm_invert | GxEPD::bm_flip_x | GxEPD::bm_flip_y;
}
E questo è invece il codice dell'immagine:
#ifndef _GxBootExample_H_
#define _GxBootExample_H_
#if defined(ESP8266) || defined(ESP32)
#include <pgmspace.h>
#else
#include <avr/pgmspace.h>
#endif
// 180 x 64 (Boot)
const unsigned char gImage_test[1440] PROGMEM = { /* 0X01,0X01,0XB4,0X00,0X40,0X00, */
0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,
0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,
0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,
0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0XF0,0XFF,0XFF,0XFF,0XFF,
0XFF,0XFF,0XFF,0XC0,0X1F,0XFF,0XFF,0XFF,0XFF,0XFF,0XFF,0X80,0X07,0XFF,0XFF,0XFF,
0XFF,0XFF,0XFF,0X00,0X01,0XFF,0XFF,0XFF,0XFF,0XFF,0XFC,0X01,0X80,0X3F,0XFF,0XFF,
0XFF,0XFF,0XFC,0X01,0XE0,0X1F,0XFF,0XFF,0XFF,0XFF,0XF8,0X10,0XF8,0X0F,0XFF,0XFF,
0XFF,0XFF,0XF8,0X70,0XF8,0X0F,0XFF,0XFF,0XFF,0XFF,0XF0,0X70,0XF8,0X0F,0XFF,0XFF,
};
#endif
P.S. non ho inserito tutto il codice dell' immagine per via della limitazione caratteri
Grazie per chiunque riuscirà ad aiutarmi 
