add grayscale support

Author: ladyada

examples/ThinkInk_gray4/ThinkInk_gray4.ino

@@ -20,6 +20,8 @@
 
 // 2.9" Grayscale Featherwing or Breakout:
 ThinkInk_290_Grayscale4_T5 display(EPD_DC, EPD_RESET, EPD_CS, SRAM_CS, EPD_BUSY);
+// 4.2" Grayscale display
+//ThinkInk_420_Grayscale4_T2 display(EPD_DC, EPD_RESET, EPD_CS, SRAM_CS, EPD_BUSY);
 
 #define COLOR1 EPD_BLACK
 #define COLOR2 EPD_LIGHT

src/drivers/Adafruit_IL0398.cpp

@@ -10,8 +10,8 @@ const uint8_t il0398_default_init_code[] {
     IL0398_BOOSTER_SOFT_START, 3, 0x17, 0x17, 0x17,
     IL0398_POWER_ON, 0,
     0xFF, 20,          // busy wait
-    IL0398_PANEL_SETTING, 2, 0x0F, 0x0, // lut from OTP & vcom = 0v
-    IL0398_VCOM, 1, 0xD7,
+    IL0398_PANEL_SETTING, 2, 0x1F, 0x0D, // lut from OTP & vcom = 0v
+    IL0398_VCOM, 1, 0x97,
     0xFE};
 
 // clang-format on
@@ -145,6 +145,10 @@ void Adafruit_IL0398::powerUp() {
   }
   EPD_commandList(init_code);
 
+  if (_epd_lut_code) {
+    EPD_commandList(_epd_lut_code);
+  }
+
   buf[0] = (HEIGHT >> 8) & 0xFF;
   buf[1] = HEIGHT & 0xFF;
   buf[2] = (WIDTH >> 8) & 0xFF;

src/panels/ThinkInk_420_Grayscale4_T2.h

@@ -3,6 +3,74 @@
 
 #include "Adafruit_EPD.h"
 
+// clang-format off
+
+static const uint8_t ti_420t2_gray4_init_code[] {
+    IL0398_POWER_SETTING, 5, 0x03, 0x00, 0x2b, 0x2b, 0x13,
+    IL0398_BOOSTER_SOFT_START, 3, 0x17, 0x17, 0x17,
+    IL0398_POWER_ON, 0,
+    0xFF, 200,
+    IL0398_PANEL_SETTING, 1, 0x3F,
+    IL0398_PLL, 1, 0x3C,    
+    IL0398_VCM_DC_SETTING, 1, 0x12,
+    IL0398_VCOM, 1, 0x97,
+    0xFE // EOM
+};
+
+static const uint8_t ti_420t2_gray4_lut_code[] = {
+  // const unsigned char lut_vcom[]PROGMEM =
+  IL0398_LUT1, 42,
+  0x00, 0x0A, 0x00, 0x00, 0x00, 0x01,
+  0x60, 0x14, 0x14, 0x00, 0x00, 0x01,
+  0x00, 0x14, 0x00, 0x00, 0x00, 0x01,
+  0x00, 0x13, 0x0A, 0x01, 0x00, 0x01,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+  // const unsigned char lut_ww[]PROGMEM ={
+  IL0398_LUTWW, 42, 
+  0x40, 0x0A, 0x00, 0x00, 0x00, 0x01,
+  0x90, 0x14, 0x14, 0x00, 0x00, 0x01,
+  0x10, 0x14, 0x0A, 0x00, 0x00, 0x01,
+  0xA0, 0x13, 0x01, 0x00, 0x00, 0x01,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+  // const unsigned char lut_bw[]PROGMEM ={
+  IL0398_LUTBW, 42,
+  0x40, 0x0A, 0x00, 0x00, 0x00, 0x01,
+  0x90, 0x14, 0x14, 0x00, 0x00, 0x01,
+  0x00, 0x14, 0x0A, 0x00, 0x00, 0x01,
+  0x99, 0x0C, 0x01, 0x03, 0x04, 0x01,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+  // const unsigned char lut_wb[]PROGMEM ={
+  IL0398_LUTWB, 42,
+  0x40, 0x0A, 0x00, 0x00, 0x00, 0x01,
+  0x90, 0x14, 0x14, 0x00, 0x00, 0x01,
+  0x00, 0x14, 0x0A, 0x00, 0x00, 0x01,
+  0x99, 0x0B, 0x04, 0x04, 0x01, 0x01,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+
+  // const unsigned char lut_bb[]PROGMEM ={
+  IL0398_LUTBB, 42,
+  0x80, 0x0A, 0x00, 0x00, 0x00, 0x01,
+  0x90, 0x14, 0x14, 0x00, 0x00, 0x01,
+  0x20, 0x14, 0x0A, 0x00, 0x00, 0x01,
+  0x50, 0x13, 0x01, 0x00, 0x00, 0x01,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+};
+
+// clang-format on
+
 class ThinkInk_420_Grayscale4_T2 : public Adafruit_IL0398 {
 private:
 public:
@@ -20,6 +88,9 @@ class ThinkInk_420_Grayscale4_T2 : public Adafruit_IL0398 {
     setBlackBuffer(1, true); // layer 1 uninverted
 
     if (mode == THINKINK_MONO) {
+      _epd_init_code = NULL;
+      _epd_lut_code = NULL;
+
       layer_colors[EPD_WHITE] = 0b00;
       layer_colors[EPD_BLACK] = 0b01;
       layer_colors[EPD_RED] = 0b01;
@@ -28,6 +99,18 @@ class ThinkInk_420_Grayscale4_T2 : public Adafruit_IL0398 {
       layer_colors[EPD_DARK] = 0b01;
     }
 
+    if (mode == THINKINK_GRAYSCALE4) {
+      _epd_init_code = ti_420t2_gray4_init_code;
+      _epd_lut_code = ti_420t2_gray4_lut_code;
+
+      layer_colors[EPD_WHITE] = 0b00;
+      layer_colors[EPD_BLACK] = 0b11;
+      layer_colors[EPD_RED] = 0b01;
+      layer_colors[EPD_GRAY] = 0b10;
+      layer_colors[EPD_LIGHT] = 0b01;
+      layer_colors[EPD_DARK] = 0b10;
+    }
+
     default_refresh_delay = 1000;
     setRotation(1);
     powerDown();