Views: 222 Author: Tina Publish Time: 2025-04-29 Origin: Site
Content Menu
● Understanding the HX8347G LCD Display
>> Key Features
● Hardware Setup for HX8347G LCD Display
>> Wiring Example with Arduino
>> Initializing the HX8347G Display
● Troubleshooting Common Issues
● Frequently Asked Questions (FAQs)
>> 1. How do I initialize the HX8347G display with Arduino?
>> 2. Can I use SPI interface with HX8347G?
>> 3. What color formats does HX8347G support?
>> 4. How do I fix color inversion or wrong colors on the display?
>> 5. Does the HX8347G module support touchscreen?
The HX8347G is a popular TFT LCD controller designed for 240x320 pixel displays with 262K colors. It is widely used in small portable devices and embedded systems due to its rich color support, low voltage operation, and flexible interface options. This article provides an in-depth guide on how to use the HX8347G LCD display, including hardware setup, interfacing, programming, and troubleshooting. We will also include illustrative diagrams, example code snippets, and videos to help you get started quickly.
The HX8347G is a single-chip driver IC designed to control TFT LCD panels with a resolution of 240 RGB x 320 dots. It supports 262,144 colors (18-bit color depth) and integrates gate drivers, source drivers, and power supply circuits, enabling efficient display control for portable devices such as PDAs and mobile phones.
- Resolution: 240 x 320 pixels
- Color Depth: 262K colors (18-bit)
- Interface Modes: Command-Parameter, Register-Content, and RGB interface modes
- Operating Voltage: Low voltage operation (as low as 1.65V for interface)
- Integrated Power Circuits: Boosters, voltage follower, and DC/DC converter for LCD driving
- Support for 8-/16-/18-bit parallel data bus and serial data transfer
- Gamma correction with 4 preset gamma curves
- On-module VCOM control and LED backlight
The HX8347G LCD module typically comes with an 8-bit parallel interface and several control pins. Below is a typical pinout description for the 2.8-inch 240x320 TFT LCD module using the HX8347 controller:
| Pin Name | Description |
|---|---|
| LCD_RST | Reset signal |
| LCD_CS | Chip select |
| LCD_RS | Command/Data selection |
| LCD_WR | Write signal |
| LCD_RD | Read signal |
| GND | Ground |
| 5V | Power supply (5V input) |
| LCD_D0-D7 | 8-bit data bus lines |
| SD_SS | SD card SPI chip select (optional) |
| SD_DI | SD card SPI MOSI (optional) |
| SD_DO | SD card SPI MISO (optional) |
| SD_SCK | SD card SPI clock (optional) |
The module often includes a level shifting IC to support both 3.3V and 5V logic, making it compatible with common microcontrollers like Arduino Uno or Mega2560[4].
To connect the HX8347G LCD to an Arduino Uno:
- Connect LCD_RST to Arduino pin 4
- Connect LCD_CS to Arduino pin 10
- Connect LCD_RS (DC) to Arduino pin 9
- Connect LCD_WR to Arduino pin 8
- Connect LCD_RD to Arduino pin 7
- Connect LCD_D0 to Arduino pin 2
- Connect LCD_D1 to Arduino pin 3
- Connect LCD_D2 to Arduino pin 4
- Connect LCD_D3 to Arduino pin 5
- Connect LCD_D4 to Arduino pin 6
- Connect LCD_D5 to Arduino pin 11
- Connect LCD_D6 to Arduino pin 12
- Connect LCD_D7 to Arduino pin 13
- Connect GND and 5V to Arduino ground and 5V respectively
The HX8347G supports multiple interface modes, but the most common for Arduino projects is the 8-bit parallel interface using the Command-Parameter mode. Initialization involves sending a sequence of commands and data to configure the display registers.
Here is a simplified initialization sequence outline:
1. Reset the display by toggling the LCD_RST pin.
2. Send a software reset command.
3. Configure power control registers.
4. Set display parameters such as gamma correction, pixel format, and frame rate.
5. Turn on the display.
Many HX8347G modules come with a resistive touchscreen overlay. To use the touch functionality, you need to interface with a separate touch controller (e.g., XPT2046) that communicates via SPI or I2C.
Arduino libraries like "TouchScreen" or "XPT2046_Touchscreen" can be used to read touch coordinates, which you can map to screen pixels for interactive applications[3][6].
- White Screen / No Display: Check wiring connections, ensure proper reset sequence, and verify power supply voltage.
- Color Inversion or Incorrect Colors: Try adjusting the pixel format register (e.g., 16-bit vs 18-bit color), or modify display orientation settings.
- Touchscreen Not Responding: Confirm the touch controller wiring and test with sample code to read touch coordinates.
- Display Flickering: Verify timing parameters and ensure stable power supply.
The HX8347G LCD display is a versatile and powerful module suitable for many embedded applications requiring rich color graphics and touchscreen input. By understanding its hardware interface, initialization sequence, and programming methods, you can successfully integrate it into your projects. Using available Arduino libraries and example codes accelerates development, while troubleshooting tips help resolve common issues. With proper setup, the HX8347G delivers vibrant, responsive displays ideal for portable and battery-powered devices.
Initialization involves resetting the display and sending a sequence of commands to configure power, pixel format, gamma correction, and display on. Use the 8-bit parallel interface to send commands and data, or leverage libraries like MCUFRIEND_kbv for simplified setup.
Yes, the HX8347G supports serial data transfer interfaces including SPI, but most common Arduino projects use the 8-bit parallel interface for faster data transfer.
The controller supports 18-bit color (262K colors) primarily, but can be configured for 16-bit color modes as well.
Adjust the pixel format register (e.g., register 0x70) and try different values to switch between 16-bit and 18-bit color modes. Also, verify orientation settings and test with example graphics to identify the correct configuration.
Many HX8347G modules include a resistive touchscreen, but the touch controller is separate and requires interfacing via SPI or I2C. Use dedicated touchscreen libraries to read touch input.
