/*
 * Copyright 2023 jacqueline <me@jacqueline.id.au>
 *
 * SPDX-License-Identifier: GPL-3.0-only
 */

#include "display_init.hpp"

namespace drivers {
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:
      0xA0,                      //     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 = {
    .width = 160,
    .height = 128,
    .num_sequences = 3,
    .sequences = {kST7735RCommonHeader, kST7735RCommonGreen,
                  kST7735RCommonFooter}};

}  // namespace displays
}  // namespace drivers