Heltec Wireless Paper, VM-E213 Hardware Revisions (#7258)

* Tests to identify display model

* (InkHUD) SSD1682 controller IC
Has a few quirks, gets its own base class

* (InkHUD) E0213A367 Display
For Heltec Wireless Paper V1.1.1, V1.2
For Heltec VM-E213 V1.1

* (InkHUD) Select display model at boot

* (BaseUI) Wrapper to combine multiple GxEPD2 drivers
Workaround for issue of GxEPD2_BW objects not having a shared base class. Allows us to select a driver at runtime.
https://github.com/meshtastic/firmware/issues/6851#issuecomment-2905353447

* (BaseUI) Select E-Ink model at boot

* (InkHUD) SSD1682 deep sleep

* (InkHUD) No deep sleep for SSD1682

* (InkHUD) Fully no-op deep sleep for SSD1682

variants/heltec_wireless_paper/einkDetect.h

@@ -0,0 +1,35 @@
+#pragma once
+
+#include "configuration.h"
+
+enum class EInkDetectionResult : uint8_t {
+    LCMEN213EFC1 = 0, // V1.1
+    E0213A367 = 1,    // V1.1.1, V1.2
+};
+
+EInkDetectionResult detectEInk()
+{
+    // Test 1: Logic of BUSY pin
+
+    // Determines controller IC manufacturer
+    // Fitipower: busy when LOW
+    // Solomon Systech: busy when HIGH
+
+    // Force display BUSY by holding reset pin active
+    pinMode(PIN_EINK_RES, OUTPUT);
+    digitalWrite(PIN_EINK_RES, LOW);
+
+    delay(10);
+
+    // Read whether pin is HIGH or LOW while busy
+    pinMode(PIN_EINK_BUSY, INPUT);
+    bool busyLogic = digitalRead(PIN_EINK_BUSY);
+
+    // Test complete. Release pin
+    pinMode(PIN_EINK_RES, INPUT);
+
+    if (busyLogic == LOW)
+        return EInkDetectionResult::LCMEN213EFC1;
+    else // busy HIGH
+        return EInkDetectionResult::E0213A367;
+}