add E-Paper Display

README.md

@@ -31,3 +31,4 @@ This project is licensed under the MIT License - see the [LICENSE.md](LICENSE.md
 ## Acknowledgments
 
 * [PlatformIO](https://platformio.org) - Cross-platform IDE
+* [GxEPD2](https://github.com/ZinggJM/GxEPD2) - E-Paper display library

platformio.ini

@@ -23,7 +23,9 @@ build_flags =
     -DWIFI_SSID2="\"${sysenv.WIFI_SSID}\""
     -DWIFI_PASSWD2="\"${sysenv.WIFI_PASSWD}\""
 
-;lib_deps =
+lib_deps =
+    GxEPD2
+    Adafruit GFX Library
 ;    ArduinoJSON
 
 monitor_speed = 115200

src/main.cpp

@@ -8,7 +8,36 @@
 #include <WiFi.h>
 #include <WiFiMulti.h>
 
+#include <GxEPD2_BW.h>
+#include <Fonts/FreeMonoBold9pt7b.h>
+#include "bitmaps/Bitmaps128x250.h"
+
 WiFiMulti wifiMulti;
+GxEPD2_BW<GxEPD2_213_B72, GxEPD2_213_B72::HEIGHT> display(GxEPD2_213_B72(/*CS=TFT_CS*/ SS, /*DC=*/ TFT_DC, /*RST=*/ TFT_RST, /*BUSY=*/ -1)); // GDEH0213B72
+
+void helloWorld()
+{
+  const char HelloWorld[] = "Hello World!";
+  //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 setup()
 {
@@ -17,6 +46,10 @@ void setup()
   // initialize LED digital pin as an output.
   pinMode(LED_BUILTIN, OUTPUT);
 
+  display.init(115200);
+  helloWorld();
+  display.powerOff();
+
   wifiMulti.addAP(WIFI_SSID, WIFI_PASSWD);
   wifiMulti.addAP(WIFI_SSID2, WIFI_PASSWD2);