C6 can't drive ST7789 correctly.

[Vincent1-python]

Describe the bug
C6 can't drive ST7789 correctly.
Images

Use easydispaly driver:

import lcd_bus
from micropython import const
import machine
import lcd_utils


# display settings
_WIDTH = const(240)
_HEIGHT = const(280)
_BL = const(3)
_RST = const(2) #no such pin
_DC = const(0)

_MOSI = const(7)
_MISO = const(2)#no such pin
_SCK = const(6)
_HOST = const(1)  # SPI2

_LCD_CS = const(1)
_LCD_FREQ = const(30000000)

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

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


import st7789  # NOQA
import lvgl as lv  # NOQA

display = st7789.ST7789(
    data_bus=display_bus,
    display_width=_WIDTH,
    display_height=_HEIGHT,
    backlight_pin=_BL,
    color_space=lv.COLOR_FORMAT.RGB565,
    color_byte_order=st7789.BYTE_ORDER_RGB,
    rgb565_byte_swap=True,
)

import task_handler  # NOQA

display.init()

#display.set_rotation(lv.DISPLAY_ROTATION._90)

display.set_backlight(1)

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()

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

use esp32c6.

[kdschlosser]

That display is a 320 x 240 display not a 240 x 280 display. Not having the correct width and height set is going to cause it to be garbles like what you are seeing. The printing that is seen on the display could be flip flopped and the display might be a 240 x 320.

I would set your width to 240 and height to 320 and see how it goes.

another thing is that not all display panels are made the same so there could be some kind of special initialization string needed for your display in order to have it run properly. If you can provide me a link to the data sheet for the display I will be able to help your out better.

[Vincent1-python]

It is useless to change it. It can also be confirmed that there is no problem in using the screen on ESP32,ESP32S3 or even ESP32C3, except ESP32C6. @kdschlosser

[kdschlosser]

If the display works with other ESP32's I have not a clue what could be causing an issue.

[Vincent1-python]

If the display works with other ESP32's I have not a clue what could be causing an issue.

A few days ago, I tried to run it on c5, and it was quite normal. I suspect it is the spi driver. You can check it.
@kdschlosser