board.c

// This file is part of the CircuitPython project: https://circuitpython.org
//
// SPDX-FileCopyrightText: Copyright (c) 2020 Scott Shawcroft for Adafruit Industries
//
// SPDX-License-Identifier: MIT

#include "supervisor/board.h"
#include "mpconfigboard.h"
#include "shared-bindings/busio/SPI.h"
#include "shared-bindings/fourwire/FourWire.h"
#include "shared-bindings/microcontroller/Pin.h"
#include "shared-module/displayio/__init__.h"
#include "shared-module/displayio/mipi_constants.h"
#include "shared-bindings/board/__init__.h"


#define DELAY 0x80

// display init sequence according to LilyGO example app
uint8_t display_init_sequence[] = {
    // sw reset
    0x01, 0 | DELAY, 150,
    // sleep out
    0x11, 0 | DELAY, 255,
    // normal display mode on
    0x13, 0,
    // display and color format settings
    0x36, 1, 0x68,
    0xB6, 2, 0x0A, 0x82,
    0x3A, 1 | DELAY,  0x55, 10,
    // ST7789V frame rate setting
    0xB2, 5, 0x0C, 0x0C, 0x00, 0x33, 0x33,
    // voltages: VGH / VGL
    0xB7, 1, 0x35,
    // ST7789V power setting
    0xBB, 1, 0x28,
    0xC0, 1, 0x0C,
    0xC2, 2, 0x01, 0xFF,
    0xC3, 1, 0x10,
    0xC4, 1, 0x20,
    0xC6, 1, 0x0F,
    0xD0, 2, 0xA4, 0xA1,
    // ST7789V gamma setting
    0xE0, 14, 0xD0, 0x00, 0x02, 0x07, 0x0A, 0x28, 0x32, 0x44, 0x42, 0x06, 0x0E, 0x12, 0x14, 0x17,
    0xE1, 14, 0xD0, 0x00, 0x02, 0x07, 0x0A, 0x28, 0x31, 0x54, 0x47, 0x0E, 0x1C, 0x17, 0x1B, 0x1E,
    0x21, 0,
    // display on
    0x29, 0 | DELAY, 255,
};


void board_init(void) {
    busio_spi_obj_t *spi = common_hal_board_create_spi(0);
    fourwire_fourwire_obj_t *bus = &allocate_display_bus()->fourwire_bus;
    bus->base.type = &fourwire_fourwire_type;

    common_hal_fourwire_fourwire_construct(
        bus,
        spi,
        &pin_GPIO34,    // DC
        &pin_GPIO33,     // CS
        &pin_GPIO41,    // RST
        40000000,       // baudrate
        0,              // polarity
        0               // phase
        );
    busdisplay_busdisplay_obj_t *display = &allocate_display()->display;
    display->base.type = &busdisplay_busdisplay_type;

    common_hal_busdisplay_busdisplay_construct(
        display,
        bus,
        240,            // width (after rotation)
        240,            // height (after rotation)
        0,             // column start
        0,             // row start
        90,              // rotation
        16,             // color depth
        false,          // grayscale
        false,          // pixels in a byte share a row. Only valid for depths < 8
        1,              // bytes per cell. Only valid for depths < 8
        false,          // reverse_pixels_in_byte. Only valid for depths < 8
        true,           // reverse_pixels_in_word
        MIPI_COMMAND_SET_COLUMN_ADDRESS, // set column command
        MIPI_COMMAND_SET_PAGE_ADDRESS,   // set row command
        MIPI_COMMAND_WRITE_MEMORY_START, // write memory command
        display_init_sequence,
        sizeof(display_init_sequence),
        &pin_GPIO45,    // backlight pin
        NO_BRIGHTNESS_COMMAND,
        1.0f,           // brightness
        false,          // single_byte_bounds
        false,          // data_as_commands
        true,           // auto_refresh
        60,             // native_frames_per_second
        true,           // backlight_on_high
        false,          // SH1107_addressing
        50000           // backlight pwm frequency
        );
}

bool espressif_board_reset_pin_number(gpio_num_t pin_number) {
    // Override the I2C/TFT power pin reset to prevent resetting the display.
    if (pin_number == 21) {
        // Turn on TFT and I2C
        gpio_set_direction(21, GPIO_MODE_DEF_OUTPUT);
        gpio_set_level(21, true);
        return true;
    }
    return false;
}

// Use the MP_WEAK supervisor/shared/board.c versions of routines not defined here.

// TODO: Should we turn off the display when asleep, in board_deinit()?