HY-TFT320 is a 3.2 inch TFT LCD Screen module, 320*240 (resolution), 65K color, 40pins interface , not just a LCD breakout, but include the Touch screen, SD card. So it’s a powerful extension module for your project.
This Screen includes a controller SSD1289, it’s 16bit data interface, easy to drive by many MCU like STM32 ,AVR and 8051.HY-TFT320 is designed with a touch controller in it . The touch IC is XPT2046 , and touch interface is included in the 40 pins breakout. Another useful extension in this module is the SD Card socket . It use the SPI mode to operate the SD card, the SPI interface include in the 40pins breakout.
•3.2" Color TFT LCD •320 x 240 Resolution •65,536 Colors (16 Bit) •Powerful 16 Bit Microcontroller(SSD1289) •Built-in video RAM buffer •Integrated Resistive Touchscreen •Integrated SD card •5V Operating Voltage •LED Backlight
Connect HY-TFT320 to Arduino Mega2560:
The TFT library is required to be installed to get this screen model display. This library is especially designed for 3.2” TFT LCD screen using 16 bit mode. The library require the following connections.
LEDA -> 5V VCC -> 5V RD -> 3.3V GND -> GND DB0->DB7 to pin D37->D30 DB8->DB15 to pin D22->D29 RS -> D38 WR -> D39 CS(pin6) -> D40 RSET-> D41
Note: The TFT controller model needs to be declared in the initializing statement. ITDB02 myGLCD(38,39,40,41) needs to be modified as myGLCD(38,39,40,41,ITDB32S), otherwise it just show a blank screen. In practice, RS, WR, CS, RSET can be connected to any free pin. But the pin number must be in accord with myGLCD(RS,WR,CS,RST).
2. Touch Screen:
The LCD has a 3.2" 4-wire resistive touch screen lying over it. The Touch library needs to be installed to get it works. This library is designed for 2.4’’ TFT, 3.2” TFT LCD screen module.
Interface the touchscreen to Arduino Mega Default pin number in example code: DCLK-> D6 CS(pin30) -> D5 IN -> D4 OUT-> D3 IRQ -> D2
Note:TCLK, TCS, TDIN, TDOUT, IRQ also can be connected to any free pin. But the pin number must be in accord with the touch screen initializing statement myTouch(DCLK,CS,IN,OUT,IRQ).
Calibrate the touch screen: The default setting is accurate for 2.4” TFT module, but you need to calibrate when using 3.2” TFT module. A program to calibrate the touch screen is included in the example. If you touch screen is inaccurate, you need to run touch_calibration. Follow the on-screen instruction to calibrate the touch screen. Better not use your finger to calibrate it, use your accessory touch pen to pressure the frontsight with stength. Then record the calibration parameters and apply them in ITDB02_Touch.cpp in your touch screen library.
3. SD Card:
There is built-in SD card slot in the shield, so we can use it to upload images. But the images need to be converted RAW format first. SD libraries tinyFAT and tinyFAT_16 need to be preinstalled for displaying the image.
Note: The library only supports FAT16 fomatted SD card up to 2GB, so you need to fomat your SD card to FAT16. 4GB FAT16 fomatted SD card is tested not working. Long file names are not supported. Keep your file names compliant with 8.3 standard.
Interface SD card to Arduino mega: SCK -> D52 MISO -> D50 MOSI-> D51 CS -> D53