From 9b69c2a9af7f950c825869000d908da17a12dd33 Mon Sep 17 00:00:00 2001
From: Chiho Sin <chihosin@icloud.com>
Date: Sun, 25 May 2025 19:08:41 +0800
Subject: [PATCH] graphics: Add GDEY0213B74 E-Ink display driver (#6879)

Implement the GDEY0213B74 driver with configuration methods for scanning, waveform, update sequence, and polling for refresh completion. This driver supports both fast and full update types for the 2.13 inch E-Ink display.

Signed-off-by: ChihoSin chihosin@icloud.com

Signed-off-by: ChihoSin chihosin@icloud.com
---
 .../niche/Drivers/EInk/GDEY0213B74.cpp        | 61 +++++++++++++++++++
 src/graphics/niche/Drivers/EInk/GDEY0213B74.h | 42 +++++++++++++
 2 files changed, 103 insertions(+)
 create mode 100644 src/graphics/niche/Drivers/EInk/GDEY0213B74.cpp
 create mode 100644 src/graphics/niche/Drivers/EInk/GDEY0213B74.h

diff --git a/src/graphics/niche/Drivers/EInk/GDEY0213B74.cpp b/src/graphics/niche/Drivers/EInk/GDEY0213B74.cpp
new file mode 100644
index 000000000..a0ff63258
--- /dev/null
+++ b/src/graphics/niche/Drivers/EInk/GDEY0213B74.cpp
@@ -0,0 +1,61 @@
+#include "./GDEY0213B74.h"
+
+#ifdef MESHTASTIC_INCLUDE_NICHE_GRAPHICS
+
+using namespace NicheGraphics::Drivers;
+
+// Map the display controller IC's output to the connected panel
+void GDEY0213B74::configScanning()
+{
+    // "Driver output control"
+    sendCommand(0x01);
+    sendData(0xF9);
+    sendData(0x00);
+    sendData(0x00);
+
+    // To-do: delete this method?
+    // Values set here might be redundant: F9, 00, 00 seems to be default
+}
+
+// Specify which information is used to control the sequence of voltages applied to move the pixels
+// - For this display, configUpdateSequence() specifies that a suitable LUT will be loaded from
+//   the controller IC's OTP memory, when the update procedure begins.
+void GDEY0213B74::configWaveform()
+{
+    sendCommand(0x3C); // Border waveform:
+    sendData(0x05);    // Screen border should follow LUT1 waveform (actively drive pixels white)
+
+    sendCommand(0x18); // Temperature sensor:
+    sendData(0x80);    // Use internal temperature sensor to select an appropriate refresh waveform
+}
+
+void GDEY0213B74::configUpdateSequence()
+{
+    switch (updateType) {
+    case FAST:
+        sendCommand(0x22); // Set "update sequence"
+        sendData(0xFF);    // Will load LUT from OTP memory, Display mode 2 "differential refresh"
+        break;
+
+    case FULL:
+    default:
+        sendCommand(0x22); // Set "update sequence"
+        sendData(0xF7);    // Will load LUT from OTP memory
+        break;
+    }
+}
+
+// Once the refresh operation has been started,
+// begin periodically polling the display to check for completion, using the normal Meshtastic threading code
+// Only used when refresh is "async"
+void GDEY0213B74::detachFromUpdate()
+{
+    switch (updateType) {
+    case FAST:
+        return beginPolling(50, 500); // At least 500ms for fast refresh
+    case FULL:
+    default:
+        return beginPolling(100, 2000); // At least 2 seconds for full refresh
+    }
+}
+#endif // MESHTASTIC_INCLUDE_NICHE_GRAPHICS
\ No newline at end of file
diff --git a/src/graphics/niche/Drivers/EInk/GDEY0213B74.h b/src/graphics/niche/Drivers/EInk/GDEY0213B74.h
new file mode 100644
index 000000000..2212fe92a
--- /dev/null
+++ b/src/graphics/niche/Drivers/EInk/GDEY0213B74.h
@@ -0,0 +1,42 @@
+/*
+
+E-Ink display driver
+    - GDEY0213B74
+    - Manufacturer: Goodisplay
+    - Size: 2.13 inch
+    - Resolution: 250px x 122px
+    - Flex connector marking: FPC-A002
+
+*/
+
+#pragma once
+
+#ifdef MESHTASTIC_INCLUDE_NICHE_GRAPHICS
+
+#include "configuration.h"
+
+#include "./SSD16XX.h"
+
+namespace NicheGraphics::Drivers
+{
+class GDEY0213B74 : public SSD16XX
+{
+    // Display properties
+  private:
+    static constexpr uint32_t width = 122;
+    static constexpr uint32_t height = 250;
+    static constexpr UpdateTypes supported = (UpdateTypes)(FULL | FAST);
+
+  public:
+    GDEY0213B74() : SSD16XX(width, height, supported) {}
+
+  protected:
+    virtual void configScanning() override;
+    virtual void configWaveform() override;
+    virtual void configUpdateSequence() override;
+    void detachFromUpdate() override;
+};
+
+} // namespace NicheGraphics::Drivers
+
+#endif // MESHTASTIC_INCLUDE_NICHE_GRAPHICS
\ No newline at end of file