Update badger2040 start sequence for more contrast

This change is taken from the pico-sdk: https://github.com/pimoroni/pimoroni-pico/blob/main/drivers/uc8151_legacy/uc8151_legacy.cpp#L67-L120 and increases the contrast of pictures sent dramatically. It comes with the expense of using way more time when updating though.

Author: mariobodemann

ports/raspberrypi/boards/pimoroni_badger2040/board.c

@@ -206,9 +206,9 @@ const uint8_t display_start_sequence[] = {
     // Look up tables for voltage sequence for pixel transition
     // Common voltage
     LUT_VCOM, 44,
-    0x00, 0x16, 0x16, 0x0d, 0x00, 0x01,
-    0x00, 0x23, 0x23, 0x00, 0x00, 0x02,
-    0x00, 0x16, 0x16, 0x0d, 0x00, 0x01,
+    0x00, 0x64, 0x64, 0x37, 0x00, 0x01,
+    0x00, 0x8c, 0x8c, 0x00, 0x00, 0x04,
+    0x00, 0x64, 0x64, 0x37, 0x00, 0x01,
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
@@ -217,39 +217,39 @@ const uint8_t display_start_sequence[] = {
 
     // White to white
     LUT_WW, 42,
-    0x54, 0x16, 0x16, 0x0d, 0x00, 0x01,
-    0x60, 0x23, 0x23, 0x00, 0x00, 0x02,
-    0xa8, 0x16, 0x16, 0x0d, 0x00, 0x01,
+    0x54, 0x64, 0x64, 0x37, 0x00, 0x01,
+    0x60, 0x8c, 0x8c, 0x00, 0x00, 0x04,
+    0xa8, 0x64, 0x64, 0x37, 0x00, 0x01,
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 
     // Black to white
     LUT_BW, 42,
-    0x54, 0x16, 0x16, 0x0d, 0x00, 0x01,
-    0x60, 0x23, 0x23, 0x00, 0x00, 0x02,
-    0xa8, 0x16, 0x16, 0x0d, 0x00, 0x01,
+    0x54, 0x64, 0x64, 0x37, 0x00, 0x01,
+    0x60, 0x8c, 0x8c, 0x00, 0x00, 0x04,
+    0xa8, 0x64, 0x64, 0x37, 0x00, 0x01,
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 
     // White to black
     LUT_WB, 42,
-    0xa8, 0x16, 0x16, 0x0d, 0x00, 0x01,
-    0x60, 0x23, 0x23, 0x00, 0x00, 0x02,
-    0x54, 0x16, 0x16, 0x0d, 0x00, 0x01,
+    0xa8, 0x64, 0x64, 0x37, 0x00, 0x01,
+    0x60, 0x8c, 0x8c, 0x00, 0x00, 0x04,
+    0x54, 0x64, 0x64, 0x37, 0x00, 0x01,
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 
     // Black to black
     LUT_BB, 42,
-    0xa8, 0x16, 0x16, 0x0d, 0x00, 0x01,
-    0x60, 0x23, 0x23, 0x00, 0x00, 0x02,
-    0x54, 0x16, 0x16, 0x0d, 0x00, 0x01,
+    0xa8, 0x64, 0x64, 0x37, 0x00, 0x01,
+    0x60, 0x8c, 0x8c, 0x00, 0x00, 0x04,
+    0x54, 0x64, 0x64, 0x37, 0x00, 0x01,
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00,