add 2.7" tricolor revision panel

Author: ladyada

examples/ThinkInk_tricolor/ThinkInk_tricolor.ino

@@ -19,9 +19,16 @@
 //ThinkInk_154_Tricolor_RW display(EPD_DC, EPD_RESET, EPD_CS, SRAM_CS, EPD_BUSY);
 //ThinkInk_213_Tricolor_RW display(EPD_DC, EPD_RESET, EPD_CS, SRAM_CS, EPD_BUSY);
 //ThinkInk_213_Tricolor_Z16 display(EPD_DC, EPD_RESET, EPD_CS, SRAM_CS, EPD_BUSY);
+
+// 2.7" Tricolor Featherwing or Breakout with IL91874 chipset
 //ThinkInk_270_Tricolor_C44 display(EPD_DC, EPD_RESET, EPD_CS, SRAM_CS, EPD_BUSY);
+
+// 2.7" Tricolor Featherwing or Breakout with EK79686 chipset
+//ThinkInk_270_Tricolor_Z70 display(EPD_DC, EPD_RESET, EPD_CS, SRAM_CS, EPD_BUSY);
+
 // 2.9" Tricolor Featherwing or Breakout:
 ThinkInk_290_Tricolor_Z10 display(EPD_DC, EPD_RESET, EPD_CS, SRAM_CS, EPD_BUSY);
+
 //ThinkInk_420_Tricolor_RW display(EPD_DC, EPD_RESET, EPD_CS, SRAM_CS, EPD_BUSY);
 
 void setup() {

src/Adafruit_ThinkInk.h

@@ -14,6 +14,7 @@ typedef enum {
 #include "panels/ThinkInk_213_Tricolor_RW.h"
 #include "panels/ThinkInk_213_Tricolor_Z16.h"
 #include "panels/ThinkInk_270_Tricolor_C44.h"
+#include "panels/ThinkInk_270_Tricolor_Z70.h"
 #include "panels/ThinkInk_290_Tricolor_Z10.h"
 #include "panels/ThinkInk_420_Tricolor_RW.h"
 

src/panels/ThinkInk_270_Tricolor_Z70.h

@@ -0,0 +1,40 @@
+#ifndef _THINKINK_270_TRICOLOR_Z70_H
+#define _THINKINK_270_TRICOLOR_Z70_H
+
+// This file is #included by Adafruit_ThinkInk.h and does not need to
+// #include anything else to pick up the EPD header or ink mode enum.
+
+class ThinkInk_270_Tricolor_Z70 : public Adafruit_EK79686 {
+public:
+  ThinkInk_270_Tricolor_Z70(int8_t SID, int8_t SCLK, int8_t DC, int8_t RST,
+                            int8_t CS, int8_t SRCS, int8_t MISO,
+                            int8_t BUSY = -1)
+      : Adafruit_EK79686(264, 176, SID, SCLK, DC, RST, CS, SRCS, MISO, -1){};
+
+  ThinkInk_270_Tricolor_Z70(int8_t DC, int8_t RST, int8_t CS, int8_t SRCS,
+                            int8_t BUSY = -1, SPIClass *spi = &SPI)
+      : Adafruit_EK79686(264, 176, DC, RST, CS, SRCS, -1, spi){};
+
+  void begin(thinkinkmode_t mode = THINKINK_TRICOLOR) {
+    Adafruit_EK79686::begin(true);
+
+    inkmode = mode; // Preserve ink mode for ImageReader or others
+
+    layer_colors[EPD_WHITE] = 0b10;
+    layer_colors[EPD_BLACK] = 0b01;
+    layer_colors[EPD_RED] = 0b10;
+    layer_colors[EPD_GRAY] = 0b10;
+    layer_colors[EPD_LIGHT] = 0b10;
+    layer_colors[EPD_DARK] = 0b01;
+
+    default_refresh_delay = 13000;
+    powerDown();
+  }
+
+  thinkinkmode_t getMode(void) { return inkmode; }
+
+private:
+  thinkinkmode_t inkmode; // Ink mode passed to begin()
+};
+
+#endif // _THINKINK_270_TRICOLOR_Z70_H