67 lines
2.4 KiB
Arduino
67 lines
2.4 KiB
Arduino
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// GxEPD2_HelloWorld.ino by Jean-Marc Zingg
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//
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// Display Library example for SPI e-paper panels from Dalian Good Display and boards from Waveshare.
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// Requires HW SPI and Adafruit_GFX. Caution: the e-paper panels require 3.3V supply AND data lines!
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//
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// Display Library based on Demo Example from Good Display: https://www.good-display.com/companyfile/32/
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//
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// Author: Jean-Marc Zingg
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//
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// Version: see library.properties
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//
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// Library: https://github.com/ZinggJM/GxEPD2
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// Supporting Arduino Forum Topics (closed, read only):
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// Good Display ePaper for Arduino: https://forum.arduino.cc/t/good-display-epaper-for-arduino/419657
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// Waveshare e-paper displays with SPI: https://forum.arduino.cc/t/waveshare-e-paper-displays-with-spi/467865
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//
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// Add new topics in https://forum.arduino.cc/c/using-arduino/displays/23 for new questions and issues
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// see GxEPD2_wiring_examples.h for wiring suggestions and examples
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// if you use a different wiring, you need to adapt the constructor parameters!
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// uncomment next line to use class GFX of library GFX_Root instead of Adafruit_GFX
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//#include <GFX.h>
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#include <GxEPD2_BW.h>
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#include <Fonts/FreeMonoBold24pt7b.h>
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// alternately you can copy the constructor from GxEPD2_display_selection.h or GxEPD2_display_selection_added.h to here
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// e.g. for Wemos D1 mini:
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GxEPD2_BW<GxEPD2_750_T7, GxEPD2_750_T7::HEIGHT> display(GxEPD2_750_T7(/*CS=5*/ 5, /*DC=*/ 17, /*RST=*/ 16, /*BUSY=*/ 4));
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// for handling alternative SPI pins (ESP32, RP2040) see example GxEPD2_Example.ino
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char HelloWorld[] = "Hello World!";
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void setup()
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{
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delay(1000);
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//display.init(115200); // default 10ms reset pulse, e.g. for bare panels with DESPI-C02
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display.init(115200, true, 2, false); // USE THIS for Waveshare boards with "clever" reset circuit, 2ms reset pulse
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updateMessage(HelloWorld);
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display.hibernate();
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}
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void updateMessage(char text[])
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{
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display.setRotation(0);
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display.setFont(&FreeMonoBold24pt7b);
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display.setTextColor(GxEPD_BLACK);
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int16_t tbx, tby; uint16_t tbw, tbh;
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display.getTextBounds(text, 0, 0, &tbx, &tby, &tbw, &tbh);
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// center the bounding box by transposition of the origin:
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uint16_t x = ((display.width() - tbw) / 2) - tbx;
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uint16_t y = ((display.height() - tbh) / 2) - tby;
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display.setFullWindow();
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display.firstPage();
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do
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{
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display.fillScreen(GxEPD_WHITE);
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display.setCursor(x, y);
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display.print(text);
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}
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while (display.nextPage());
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}
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void loop() {};
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