Waveshare ESP32-S3 4.3inch Touch LCD Development Board Type B, 800×480 - ESPhome YAML example

panel.yaml

esphome:
  name: panel
  friendly_name: panel
  platformio_options:
    build_flags: "-DBOARD_HAS_PSRAM"
    board_build.arduino.memory_type: qio_opi
    board_build.flash_mode: dio
    board_upload.maximum_ram_size: 524288
    

esp32:
  board: esp32-s3-devkitc-1
  variant: esp32s3
  framework:
    type: esp-idf
    sdkconfig_options:
      CONFIG_ESP32S3_DEFAULT_CPU_FREQ_240: y
      CONFIG_ESP32S3_DATA_CACHE_64KB: y
      CONFIG_SPIRAM_FETCH_INSTRUCTIONS: y
      CONFIG_SPIRAM_RODATA: y

# Enable logging
logger:

i2c:
  sda: GPIO08
  scl: GPIO09
# scan: True
  id: bus_a

ch422g:
  - id: ch422g_hub
    address: 0x24 
# Of the CH422's twenty-four i2c addresses, 0x24 is the correct one to use in the setup here. 
# Still, wow, that's a lot of i2c addresses. 

# Enable Home Assistant API
api:
  encryption:
    key: 

ota:
  - platform: esphome
    password: 
wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Panel Fallback Hotspot"
    password: 

captive_portal:

psram:
  mode: octal
  speed: 80MHz

# Define display
display:
  - platform: rpi_dpi_rgb
    id: my_display
    auto_clear_enabled: false
    color_order: RGB
    pclk_frequency: 16MHZ
    dimensions:
      width: 800
      height: 480
    de_pin:
      number: 5
    hsync_pin:
      number: 46
      ignore_strapping_warning: true
    vsync_pin:
      number: 3
      ignore_strapping_warning: true
    pclk_pin: 7
    reset_pin:
      ch422g: ch422g_hub
      number: 3
    enable_pin:
      ch422g: ch422g_hub
      number: 2  
    hsync_back_porch: 16
    hsync_front_porch: 16
    hsync_pulse_width: 8
    vsync_back_porch: 16
    vsync_front_porch: 16
    vsync_pulse_width: 8
    data_pins:
      red:
        - 1         #r3
        - 2         #r4
        - 42        #r5
        - 41        #r6
        - 40        #r7
      blue:
        - 14        #b3
        - 38        #b4
        - 18        #b5
        - 17        #b6
        - 10        #b7
      green:
        - 39        #g2
        - 0         #g3
        - 45        #g4
        - 48        #g5
        - 47        #g6
        - 21        #g7

touchscreen:
  platform: gt911
  id: my_touch
  # Uncomment below if you got the janky OTHER i2c address this time 
  #address: 0x14  
  # Probably fixed by adding reset_pin via CH422 though
  interrupt_pin: GPIO4
  # DEFINE RESET PIN for consistent i2c address selection
  # CTP_RST is wired to IO1 of CH422G
  reset_pin:
    ch422g: ch422g_hub
    number: 1
    mode: OUTPUT
  on_touch:
    - lambda: |-
        ESP_LOGI("Touch", "Touch detected at x=%d, y=%d", touch.x, touch.y);

# Define fonts
font:
  - file: "gfonts://Roboto"
    id: roboto24
    size: 24
    bpp: 4
  - file: "gfonts://Roboto"
    id: roboto18
    size: 18
    bpp: 4

binary_sensor:
  - platform: homeassistant
    id: demo_light_status
    entity_id: light.demo
    internal: true
    on_state:
      then:
        - lambda: |-
            if (id(demo_light_status).state) {
              lv_obj_add_state(id(lv_button_demo_light), LV_STATE_CHECKED);
              lv_label_set_text(id(demo_light_status_label), "On");
            } else {
              lv_obj_clear_state(id(lv_button_demo_light), LV_STATE_CHECKED);
              lv_label_set_text(id(demo_light_status_label), "Off");
            }

lvgl:
  displays:
    - my_display
  touchscreens:
    - my_touch
  theme:
    button:
      bg_color: 0x333333
      bg_grad_dir: VER
      text_color: 0xFFFFFF
      checked:
        bg_color: 0xcc9900
        text_color: 0x000000
        bg_grad_color: 0x664d00
      pressed:
        border_color: 0xff6600
  pages:
    - id: main_page
      layout:
        type: flex
        flex_flow: column_wrap
      width: 100%
      bg_color: 0x000000
      bg_opa: cover
      pad_all: 5
      widgets:
        - button:
            checkable: true
            id: lv_button_demo_light
            width: 140
            height: 150
            widgets:
              - label:
                  text_font: roboto24
                  text: "Demo\nLamp"
              - label:
                  id: demo_light_status_label
                  text: "Off"
                  align: bottom_left
            on_click:
              then:
                - homeassistant.service:
                    service: light.toggle
                    data:
                      entity_id: light.demo

interval:
  - interval: 20s
    #startup_delay: 15s
    then:
       - lambda: |-
           if (id(demo_light_status).state) {
             lv_obj_add_state(id(lv_button_demo_light), LV_STATE_CHECKED);
             lv_label_set_text(id(demo_light_status_label), "On");
           } else {
             lv_obj_clear_state(id(lv_button_demo_light), LV_STATE_CHECKED);
              lv_label_set_text(id(demo_light_status_label), "Off");
           }
        

I believe I have managed to fix this issue by soldering some 47 pF capacitors on the ESP32 I2C bus from SDA and SCL to ground (CPU/CH422G side of M1). I did this by soldering two 0603 47pf caps vertically to the SDA an SCL ends of R100 and R101 (RHS when ESP32-S3-Touch-LCD-4.3B viewed from rear with text the correct way up) and with the caps top soldered via some thin wirewrap wire to the right hand pad of C42 (or where C42 would be fitted) as this is GND.
With my test program which failed every 10 seconds or so, it has now lasted > 30 minutes without any issues.
I have also changed my real program to use touch interrupts (in combination with polling) so that the touch controller isn't being read every 10ms reducing I2C traffic hugely. As a belt and braces I may occasionally read the CH422G input register and if it is not as it should be re-configure the CH422G.

Is there a good Waveshare forum to put this fix on ?