Setting up lvgl_micropython on the Sunton ESP32 2432S024C 2.4" Capacitive touch LCD board

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Below is how I got the screen and touch working on my Sunton ESP32 2432S024

Build:-

python3 make.py esp32 BOARD=ESP32_GENERIC BOARD_VARIANT=SPIRAM DISPLAY=ili9341 INDEV=cst820

Note: the cst820 driver is the cst816s driver with the chip_id changed from 0xB5 to 0xB7, but otherwise identical.

(Optional) backup your flash before overwriting it:

export PORT=/dev/ttyS6 esptool.py --port $PORT read_flash 0x0 0x400000 lcd_3.2inch_ESP32-2432S024C.bin

Flash:-

esptool.py --port $PORT write_flash 0x0 lvgl_micropy_ESP32_GENERIC-SPIRAM-4.bin

Upload a test:-

ampy --port $PORT put lvgl_test_2432S024C.py

Run it:-

mcu_serial.pl -port $PORT
import lvgl_test_2432S024C

The test program:

cat lvgl_test_2432S024C.py

#lvgl_test_2432S024C.py

import lcd_bus
from micropython import const
import machine
from i2c import I2C

# display settings
_WIDTH  = const(240)
_HEIGHT = const(320)
_BL     = const(27)  # Backlight pin
_RST    = const(17)  # Reset - use -1 if you have none
_DC     = const(2)

_MOSI = const(13)
_MISO = const(12)
_SCK  = const(14)
_HOST = const(1)  # SPI2

_LCD_CS = const(15)
_LCD_FREQ = const(40000000)  

spi_bus = machine.SPI.Bus(
    host=_HOST,
    mosi=_MOSI,
    miso=_MISO,
    sck=_SCK
)

display_bus = lcd_bus.SPIBus(
    spi_bus=spi_bus,
    freq=_LCD_FREQ,
    dc=_DC,
    cs=_LCD_CS,
)


import ili9341  # NOQA
import lvgl as lv  # NOQA

display = ili9341.ILI9341(
    data_bus=display_bus,
    display_width=_WIDTH,
    display_height=_HEIGHT,
    backlight_pin=_BL,
    backlight_on_state=ili9341.STATE_PWM,
    color_space=lv.COLOR_FORMAT.RGB565,
    color_byte_order=ili9341.BYTE_ORDER_BGR,
    rgb565_byte_swap=True
)

import task_handler  # NOQA

import cst820

I2C_BUS = I2C.Bus(
    host=0,
    scl=32,
    sda=33,
    freq=400000,
    use_locks=False
)

TOUCH_DEVICE = I2C.Device(
    I2C_BUS,
    dev_id=cst820.I2C_ADDR,
    reg_bits=cst820.BITS
)

display.set_power(True)
display.init(type=1)
display.set_backlight(100)
indev = cst820.CST820(TOUCH_DEVICE)


th = task_handler.TaskHandler()

scrn = lv.screen_active()
scrn.set_style_bg_color(lv.color_hex(0x000000), 0)

slider = lv.slider(scrn)
slider.set_size(300, 50)
slider.center()

main_label = lv.label(scrn)
main_label.set_text('HELLO WORLD!')
main_label.align(lv.ALIGN.CENTER, 0, -50)

# Add R G and B colour checks
r_label = lv.label(scrn)
r_label.set_text('R')
r_label.set_style_text_color(lv.color_hex(0xFF0000), 0)
r_label.align_to(main_label, lv.ALIGN.OUT_TOP_LEFT, -20, -10)

g_label = lv.label(scrn)
g_label.set_text('G')
g_label.set_style_text_color(lv.color_hex(0x00FF00), 0)
g_label.align_to(main_label, lv.ALIGN.OUT_TOP_MID, 0, -10)

b_label = lv.label(scrn)
b_label.set_text('B')
b_label.set_style_text_color(lv.color_hex(0x0000FF), 0)
b_label.align_to(main_label, lv.ALIGN.OUT_TOP_RIGHT, 20, -10)

Screenshots:-