add grayscale support (need to go back and fix tricolor)

Author: ladyada

src/drivers/Adafruit_IL91874.cpp

@@ -184,61 +184,9 @@ void Adafruit_IL91874::powerUp() {
   }
   EPD_commandList(init_code);
 
-  /*
-  EPD_command(IL91874_POWER_ON);
-  busy_wait();
-
-  buf[0] = 0xAF;
-  EPD_command(IL91874_PANEL_SETTING, buf, 1);
-
-  buf[0] = 0x3a;
-  EPD_command(IL91874_PLL, buf, 1);
-
-  buf[0] = 0x03;
-  buf[1] = 0x00;
-  buf[2] = 0x2b;
-  buf[3] = 0x2b;
-  buf[4] = 0x09;
-  EPD_command(IL91874_POWER_SETTING, buf, 5);
-
-  buf[0] = 0x07;
-  buf[1] = 0x07;
-  buf[2] = 0x017;
-  EPD_command(IL91874_BOOSTER_SOFT_START, buf, 3);
-
-  buf[0] = 0x60;
-  buf[1] = 0xA5;
-  EPD_command(0xF8, buf, 2);
-
-  buf[0] = 0x89;
-  buf[1] = 0xA5;
-  EPD_command(0xF8, buf, 2);
-
-  buf[0] = 0x90;
-  buf[1] = 0x00;
-  EPD_command(0xF8, buf, 2);
-
-  buf[0] = 0x93;
-  buf[1] = 0x2A;
-  EPD_command(0xF8, buf, 2);
-
-  buf[0] = 0x73;
-  buf[1] = 0x41;
-  EPD_command(0xF8, buf, 2);
-
-  buf[0] = 0x12;
-  EPD_command(IL91874_VCM_DC_SETTING, buf, 1);
-
-  buf[0] = 0x87;
-  EPD_command(IL91874_CDI, buf, 1);
-
-  EPD_command(IL91874_LUT1, lut_vcomDC, 44);
-  EPD_command(IL91874_LUTWW, lut_ww, 42);
-  EPD_command(IL91874_LUTBW, lut_bw, 42);
-  EPD_command(IL91874_LUTWB, lut_wb, 42);
-  EPD_command(IL91874_LUTBB, lut_bb, 42);
-
-  */
+  if (_epd_lut_code) {
+    EPD_commandList(_epd_lut_code);
+  }
 
   buf[0] = (HEIGHT >> 8) & 0xFF;
   buf[1] = HEIGHT & 0xFF;

src/panels/ThinkInk_270_Grayscale4_W3.h

@@ -3,6 +3,84 @@
 
 #include "Adafruit_EPD.h"
 
+// clang-format off
+
+static const uint8_t ti_270w3_gray4_init_code[] {
+    IL91874_POWER_SETTING, 4, 0x03, 0x00, 0x2b, 0x2b,
+    IL91874_BOOSTER_SOFT_START, 3, 0x07, 0x07, 0x17,
+    0xF8, 2, 0x60, 0xA5, // boost
+    0xF8, 2, 0x89, 0xA5, // boost
+    0xF8, 2, 0x90, 0x00, // boost
+    0xF8, 2, 0x93, 0x2A, // boost
+    0xF8, 2, 0xA0, 0xA5, // boost
+    0xF8, 2, 0xA1, 0x00, // boost
+    0xF8, 2, 0x73, 0x41, // boost
+    IL91874_PDRF, 1, 0x00,
+    IL91874_POWER_ON, 0,
+    0xFF, 200,
+    IL91874_PANEL_SETTING, 1, 0xBF,
+    IL91874_PLL, 1, 0x90,
+    IL91874_VCM_DC_SETTING, 1, 0x12,
+    IL91874_CDI, 1, 0x97,
+    0xFE // EOM
+};
+
+
+static const uint8_t ti_270w3_gray4_lut_code[] = {
+  // const unsigned char lut_vcom[]PROGMEM =
+  IL91874_LUT1, 44,
+  0x00, 0x00,
+  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 ={
+  IL91874_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 ={
+  IL91874_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 ={
+  IL91874_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 ={
+  IL91874_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_270_Grayscale4_W3 : public Adafruit_IL91874 {
 private:
 public:
@@ -31,6 +109,16 @@ class ThinkInk_270_Grayscale4_W3 : public Adafruit_IL91874 {
       layer_colors[EPD_LIGHT] = 0b00;
       layer_colors[EPD_DARK] = 0b10;
     }
+    if (mode == THINKINK_GRAYSCALE4) {
+      _epd_init_code = ti_270w3_gray4_init_code;
+      _epd_lut_code = ti_270w3_gray4_lut_code;
+      layer_colors[EPD_WHITE] = 0b00;
+      layer_colors[EPD_BLACK] = 0b11;
+      layer_colors[EPD_RED] = 0b10;
+      layer_colors[EPD_GRAY] = 0b10;
+      layer_colors[EPD_LIGHT] = 0b10;
+      layer_colors[EPD_DARK] = 0b01;
+    }
 
     default_refresh_delay = 1000;
     powerDown();