From 1bcf59163b73ae688f6c7434519491d4613289ec Mon Sep 17 00:00:00 2001
From: jacqueline <me@jacqueline.id.au>
Date: Tue, 1 Nov 2022 15:30:15 +1100
Subject: WIP display stuff that /could/ work, but i think my display is bad :(

---
 main/display-init.cpp | 103 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 main/display-init.cpp

(limited to 'main/display-init.cpp')

diff --git a/main/display-init.cpp b/main/display-init.cpp
new file mode 100644
index 00000000..e4545339
--- /dev/null
+++ b/main/display-init.cpp
@@ -0,0 +1,103 @@
+#include "display-init.hpp"
+
+namespace gay_ipod {
+namespace displays {
+
+/* Bit to use to signify we should delay after part of an init sequence */
+const uint8_t kDelayBit = 0x80;
+
+// ST7735 commands and general format from the Adafruit library for these
+// displays. AFAICT it's the most complete implementation out there, and I
+// really don't want to have to derive this from the datasheet myself.
+// See https://github.com/adafruit/Adafruit-ST7735-Library/
+
+// clang-format off
+static const uint8_t kST7735RCommonHeader[]{
+    15,                          // 15 commands in list:
+    ST77XX_SWRESET,   kDelayBit, //  1: Software reset, 0 args, w/delay
+      150,                       //     150 ms delay
+    ST77XX_SLPOUT,    kDelayBit, //  2: Out of sleep mode, 0 args, w/delay
+      255,                       //     500 ms delay
+    ST7735_FRMCTR1, 3,           //  3: Framerate ctrl - normal mode, 3 arg:
+      0x01, 0x2C, 0x2D,          //     Rate = fosc/(1x2+40) * (LINE+2C+2D)
+    ST7735_FRMCTR2, 3,           //  4: Framerate ctrl - idle mode, 3 args:
+      0x01, 0x2C, 0x2D,          //     Rate = fosc/(1x2+40) * (LINE+2C+2D)
+    ST7735_FRMCTR3, 6,           //  5: Framerate - partial mode, 6 args:
+      0x01, 0x2C, 0x2D,          //     Dot inversion mode
+      0x01, 0x2C, 0x2D,          //     Line inversion mode
+    ST7735_INVCTR,  1,           //  6: Display inversion ctrl, 1 arg:
+      0x07,                      //     No inversion
+    ST7735_PWCTR1,  3,           //  7: Power control, 3 args, no delay:
+      0xA2,
+      0x02,                      //     -4.6V
+      0x84,                      //     AUTO mode
+    ST7735_PWCTR2,  1,           //  8: Power control, 1 arg, no delay:
+      0xC5,                      //     VGH25=2.4C VGSEL=-10 VGH=3 * AVDD
+    ST7735_PWCTR3,  2,           //  9: Power control, 2 args, no delay:
+      0x0A,                      //     Opamp current small
+      0x00,                      //     Boost frequency
+    ST7735_PWCTR4,  2,           // 10: Power control, 2 args, no delay:
+      0x8A,                      //     BCLK/2,
+      0x2A,                      //     opamp current small & medium low
+    ST7735_PWCTR5,  2,           // 11: Power control, 2 args, no delay:
+      0x8A, 0xEE,
+    ST7735_VMCTR1,  1,           // 12: Power control, 1 arg, no delay:
+      0x0E,
+    ST77XX_INVOFF,  0,           // 13: Don't invert display, no args
+    ST77XX_MADCTL,  1,           // 14: Mem access ctl (directions), 1 arg:
+      0xC8,                      //     row/col addr, bottom-top refresh
+    ST77XX_COLMOD,  1,           // 15: set color mode, 1 arg, no delay:
+      0x05
+};
+
+// Commands to include for the variant of the panel that has a green pull tab on
+// the screen protector.
+static const uint8_t kST7735RCommonGreen[]{
+    2,                           //  2 commands in list:
+    ST77XX_CASET,   4,           //  1: Column addr set, 4 args, no delay:
+      0x00, 0x02,                //     XSTART = 0
+      0x00, 0x7F+0x02,           //     XEND = 127
+    ST77XX_RASET,   4,           //  2: Row addr set, 4 args, no delay:
+      0x00, 0x01,                //     XSTART = 0
+      0x00, 0x9F+0x01};
+
+// Commands to include for the variant of the panel that has a red pull tab on
+// the screen protector.
+static const uint8_t kST7735RCommonRed[]{
+    3,                           //  2 commands in list:
+    ST77XX_CASET,   4,           //  1: Column addr set, 4 args, no delay:
+      0x00, 0x00,                //     XSTART = 0
+      0x00, 0x7F,		 //     XEND = 127
+    ST77XX_RASET,   4,           //  2: Row addr set, 4 args, no delay:
+      0x00, 0x00,                //     XSTART = 0
+      0x00, 0x9F,
+    ST77XX_MADCTL,   1,
+      0xC0,
+};
+
+static const uint8_t kST7735RCommonFooter[]{
+    4,                           //  4 commands in list:
+    ST7735_GMCTRP1, 16      ,    //  1: Gamma Adjustments (pos. polarity), 16 args + delay:
+      0x02, 0x1c, 0x07, 0x12,    //     (Not entirely necessary, but provides
+      0x37, 0x32, 0x29, 0x2d,    //      accurate colors)
+      0x29, 0x25, 0x2B, 0x39,
+      0x00, 0x01, 0x03, 0x10,
+    ST7735_GMCTRN1, 16      ,    //  2: Gamma Adjustments (neg. polarity), 16 args + delay:
+      0x03, 0x1d, 0x07, 0x06,    //     (Not entirely necessary, but provides
+      0x2E, 0x2C, 0x29, 0x2D,    //      accurate colors)
+      0x2E, 0x2E, 0x37, 0x3F,
+      0x00, 0x00, 0x02, 0x10,
+    ST77XX_NORON,     kDelayBit, //  3: Normal display on, no args, w/delay
+      10,                           //     10 ms delay
+    ST77XX_DISPON,    kDelayBit, //  4: Main screen turn on, no args w/delay
+      100
+};
+// clang-format on
+
+const InitialisationData kST7735R = {
+    .num_sequences = 3,
+    .sequences = {kST7735RCommonHeader, kST7735RCommonRed,
+                  kST7735RCommonFooter}};
+
+}  // namespace displays
+}  // namespace gay_ipod
-- 
cgit v1.2.3