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User Guide

To help users quickly understand the various functions of the product, we provide a series of test examples to familiarize customers with the use of each interface. In addition to the ESP32-S3-Touch-LCD-4.3B main unit and its included cables, the following components are required to run the examples:

Component Preparation​

  • ESP32-S3-Touch-LCD-4.3B ×1
  • TF card ×1
  • USB cable Type-A male → Type-C male ×1
  • USB to RS485 Bidirectional Converter ×1
  • USB to CAN Adapter / Analyzer ×1

ESP32-S3-Touch-LCD-4.3B-usenotes-01

Precautions​

  • The development board features an automatic download circuit. The Type-C interface labeled UART is used for program download and log printing. After downloading, press the RESET button to run the program.

  • Pay attention to the PCB antenna area during use, avoiding metal or plastic parts from touching the antenna location.

  • The TF card supports SPI / MMC communication. Note that the SD_CS pin must be driven by EXIO4 of the CH422G.

  • The development board uses 3.5 mm terminal to bring out peripheral pins such as CAN, I2C, RS485, and isolated I/O.

  • CAN and RS485 peripherals are not connected to 120 Ω termination resistors by default via a switch. Optionally turn ON the switch to enable termination resistor connection.

  • The 4.3inch screen occupies most GPIOs. The development board uses the CH422G IO expander chip for control such as reset and backlight.

  • The MX1.25 lithium battery connector supports only a single 3.7 V lithium battery. Do not connect multiple battery packs simultaneously for charging/discharging. It is recommended to use a single cell with a capacity of ≤ 2000 mAh.

  • The board's CH422G and touch controller occupy the following I²C slave addresses.
    Do not use I²C devices with the same addresses:

         0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
    00:  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -
    10:  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -
    20:  20 21 22 23 24 25 26 27 -  -  -  -  -  -  -  -
    30:  30 31 32 33 34 35 36 37 38 39 3a 3b 3c 3d 3e 3f
    40:  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -
    50:  -  51 -  -  -  -  -  -  -  -  -  -  -  -  5d -
    60:  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -
    70:  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -  -

⚠️ USB Download Precautions (Important)​

Programming the development board via USB

If the port is not recognized, please enter Boot mode:

  1. Press and hold the BOOT button
  2. Connect the USB cable to the computer
  3. Release the BOOT button

After the download is complete, press the RESET button to run the program.

Performance Notes (ESP-IDF & LVGL)​

Currently, under the ESP-IDF v5.3 environment, using single-core to run the LVGL benchmark example:

  • Average frame rate limit: 26 FPS
  • Interface frame rate: 41 FPS
  • PCLK: 21 MHz

The following options must be configured in menuconfig before compilation:​

CONFIG_FREERTOS_HZ=1000
CONFIG_ESP_DEFAULT_CPU_FREQ_MHZ_240=y
CONFIG_ESPTOOLPY_FLASHMODE_QIO=y
CONFIG_ESPTOOLPY_FLASHFREQ_120M=y     # Must be consistent with PSRAM
CONFIG_SPIRAM_MODE_OCT=y
CONFIG_IDF_EXPERIMENTAL_FEATURES=y
CONFIG_SPIRAM_SPEED_120M=y            # Must be consistent with FLASH
CONFIG_SPIRAM_FETCH_INSTRUCTIONS=y
CONFIG_SPIRAM_RODATA=y
CONFIG_ESP32S3_DATA_CACHE_LINE_64B=y
CONFIG_COMPILER_OPTIMIZATION_PERF=y

LVGL Configuration Recommendations (v8.3)​

#define LV_MEM_CUSTOM 1
#define LV_MEMCPY_MEMSET_STD 1
#define LV_ATTRIBUTE_FAST_MEM IRAM_ATTR

For detailed LCD and LVGL performance descriptions, please refer to Performance Documentation