/*
 * ST7701S initialisation sequence for the CrowPanel 2.1" round panel.
 *
 * Transcribed verbatim from `st7701_type5_init_operations` in the
 * Arduino_GFX bundled with Elecrow's own example for this board
 * (example/libraries/GFX_Library_for_Arduino/src/display/Arduino_ST7701_RGBPanel.h),
 * which is what example/RotaryScreen_2_1/RotaryScreen_2_1.ino passes to the
 * panel constructor.
 *
 * PRD 8.1: one wrong byte here gives garbage or nothing, with no useful
 * diagnostic. Do not "tidy" these values. Do not reorder them. The bank
 * selects (0xFF ...) change the meaning of every register that follows, so a
 * command moved across one is a different command.
 *
 * Cross-checked against example/esphome/esphome2.1.yaml, which carries the
 * same sequence minus three commands in bank 0x10 (0xC0, 0xC1, 0xC2) — and
 * which admits in its own comments that its colours come out wrong. The three
 * extra commands are kept.
 *
 * The leading software reset (0x01) is from the ESPHome version. It is not in
 * the Arduino one, but it costs 5ms and makes the starting state deterministic
 * rather than "whatever the previous firmware left behind".
 */
#pragma once

#include <stdint.h>

typedef struct {
    uint8_t cmd;
    uint8_t data[16];
    uint8_t data_len;
    uint16_t delay_ms;
} st7701_cmd_t;

static const st7701_cmd_t st7701_init_seq[] = {
    /* Software reset. */
    {0x01, {0}, 0, 5},

    /* ---- Bank 0x10 ---- */
    {0xFF, {0x77, 0x01, 0x00, 0x00, 0x10}, 5, 0},

    {0xC0, {0x3B, 0x00}, 2, 0},
    {0xC1, {0x0B, 0x02}, 2, 0},     /* VBP */
    {0xC2, {0x00, 0x02}, 2, 0},

    {0xCC, {0x10}, 1, 0},
    {0xCD, {0x08}, 1, 0},

    /*
     * Not part of st7701_type5_init_operations, but Arduino_GFX's
     * begin() calls setRotation(0) straight afterwards, and that path sends
     * 0xC7 0x00 here (Y direction) before dropping back to bank 0x00 to write
     * MADCTL. The vendor example therefore does send it, so it belongs in the
     * sequence.
     *
     * That same setRotation(0) call is where the constructor's `bgr = true`
     * argument lands: with bgr set it writes MADCTL 0x00, which is what this
     * sequence already writes below. So bgr=true is a no-op at rotation 0 and
     * the RGB panel does not need its BGR flag set.
     */
    {0xC7, {0x00}, 1, 0},

    /* Positive voltage gamma control. */
    {0xB0, {0x02, 0x13, 0x1B, 0x0D,
            0x10, 0x05, 0x08, 0x07,
            0x07, 0x24, 0x04, 0x11,
            0x0E, 0x2C, 0x33, 0x1D}, 16, 0},

    /* Negative voltage gamma control. */
    {0xB1, {0x05, 0x13, 0x1B, 0x0D,
            0x11, 0x05, 0x08, 0x07,
            0x07, 0x24, 0x04, 0x11,
            0x0E, 0x2C, 0x33, 0x1D}, 16, 0},

    /* ---- Bank 0x11 ---- */
    {0xFF, {0x77, 0x01, 0x00, 0x00, 0x11}, 5, 0},

    {0xB0, {0x5D}, 1, 0},
    {0xB1, {0x43}, 1, 0},           /* VCOM amplitude */
    {0xB2, {0x81}, 1, 0},           /* VGH, 12V */
    {0xB3, {0x80}, 1, 0},

    {0xB5, {0x43}, 1, 0},           /* VGL, -8.3V */

    {0xB7, {0x85}, 1, 0},
    {0xB8, {0x20}, 1, 0},

    {0xC1, {0x78}, 1, 0},
    {0xC2, {0x78}, 1, 0},

    {0xD0, {0x88}, 1, 0},

    {0xE0, {0x00, 0x00, 0x02}, 3, 0},

    {0xE1, {0x03, 0xA0, 0x00, 0x00,
            0x04, 0xA0, 0x00, 0x00,
            0x00, 0x20, 0x20}, 11, 0},

    {0xE2, {0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00,
            0x00}, 13, 0},

    {0xE3, {0x00, 0x00, 0x11, 0x00}, 4, 0},

    {0xE4, {0x22, 0x00}, 2, 0},

    {0xE5, {0x05, 0xEC, 0xA0, 0xA0,
            0x07, 0xEE, 0xA0, 0xA0,
            0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00}, 16, 0},

    {0xE6, {0x00, 0x00, 0x11, 0x00}, 4, 0},

    {0xE7, {0x22, 0x00}, 2, 0},

    {0xE8, {0x06, 0xED, 0xA0, 0xA0,
            0x08, 0xEF, 0xA0, 0xA0,
            0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00}, 16, 0},

    {0xEB, {0x00, 0x00, 0x40, 0x40,
            0x00, 0x00, 0x00}, 7, 0},

    {0xED, {0xFF, 0xFF, 0xFF, 0xBA,
            0x0A, 0xBF, 0x45, 0xFF,
            0xFF, 0x54, 0xFB, 0xA0,
            0xAB, 0xFF, 0xFF, 0xFF}, 16, 0},

    {0xEF, {0x10, 0x0D, 0x04, 0x08,
            0x3F, 0x1F}, 6, 0},

    /* ---- Bank 0x13 ---- */
    {0xFF, {0x77, 0x01, 0x00, 0x00, 0x13}, 5, 0},
    {0xEF, {0x08}, 1, 0},

    /* ---- Back to the command bank ---- */
    {0xFF, {0x77, 0x01, 0x00, 0x00, 0x00}, 5, 0},

    {0x36, {0x00}, 1, 0},           /* MADCTL */
    {0x3A, {0x60}, 1, 0},           /* 0x70=RGB888, 0x60=RGB666, 0x50=RGB565 */

    {0x11, {0}, 0, 120},            /* sleep out */
    {0x29, {0}, 0, 50},             /* display on */
};

#define ST7701_INIT_SEQ_LEN \
    (sizeof(st7701_init_seq) / sizeof(st7701_init_seq[0]))