Wozzy
Well-known member
Yesterday I received a 2.2" ILI9341 LCD Display. I also just discovered the magnificent UTFT library by Henning Karlsen.
It was very easy to get it working with the Teensy3.0. I probably had it working withing 45 minutes of unpacking the display.
I am using the latest version of software and libraries. Teensyduino 1.18, Arduino 1.0.5, and UTFT V2.75
The UTFT library was just updated a couple of weeks ago, and has Teensy3.x support built in.
The UTFT Library is located here: http://www.henningkarlsen.com/electronics/library.php?id=51
The ILI9341 LCD display is very sharp, bright and clear, however it seems very slow compared to my older 1.8" ST7735 display.
Does anyone have any ideas to speed up the display rate?
Here's an image of the display:
Click here for video: ILI9341 - Teensy 3.0 Video
Here is the code from the example above:
Notice there are no delays in the code above, so I would expect the update to be much faster.
I assume that it's the SPI communications with the ILI9341 that is the bottleneck.
It was very easy to get it working with the Teensy3.0. I probably had it working withing 45 minutes of unpacking the display.
I am using the latest version of software and libraries. Teensyduino 1.18, Arduino 1.0.5, and UTFT V2.75
The UTFT library was just updated a couple of weeks ago, and has Teensy3.x support built in.
The UTFT Library is located here: http://www.henningkarlsen.com/electronics/library.php?id=51
The ILI9341 LCD display is very sharp, bright and clear, however it seems very slow compared to my older 1.8" ST7735 display.
Does anyone have any ideas to speed up the display rate?
Here's an image of the display:
Click here for video: ILI9341 - Teensy 3.0 Video
Here is the code from the example above:
Code:
/
*************************************************************************************
UTFT_ViewFont (C)2013 Henning Karlsen
web: http://www.henningkarlsen.com/electronics
Fonts: http://www.henningkarlsen.com/electronics/r_fonts.php
This program is a demo of the included fonts Plus a few downloaded ones.
This demo was made for modules with a screen resolution
of 320x240 pixels.
This program requires the UTFT library.
**************************************************************************************
AliExpress ILI9341 2.2 Inch 240*320 SPI TFT LCD Display
http://www.aliexpress.com/item/Wholesale-1PC-2-2-Inch-240-320-Dots-SPI-TFT-LCD-Serial-Port-Module-Display-ILI9341/1188518505.html
ILI9341 ............. Teensy 3.x
VCC ................. 3.3V
GND ................. Ground
CS .................. 10
RESET ............... 8
D/C ................. 9
SDO (MOSI) .......... 11
SCK ................. 13
LED ................. 100 Ohm -> 5V
SDO (MISO) .......... 12
***************************************************************************************/
#include <UTFT.h>
// Declare which fonts we will be using
extern uint8_t arial_bold[];
extern uint8_t Inconsola[];
extern uint8_t SevenSegNumFont[];
// ILI9341 on Teensy 3.1
UTFT myGLCD(ILI9341_S5P,11,13,10,8,9); // Remember to change the model parameter to suit your display module!
void setup()
{
myGLCD.InitLCD();
myGLCD.clrScr();
}
void loop()
{
for (int i=319; i>20; i=i-2){
myGLCD.setBackColor(0, 0, 0);
myGLCD.setColor(255, 31, 31);
myGLCD.setFont(arial_bold);
myGLCD.print("ILI9341", i, 30, 0); // Print String x=i, y=30, rotation angle = 0
myGLCD.print("Teensy 3.x", i, 50, 0); // Print String x=i, y=50, rotation angle = 0
}
myGLCD.setColor(0, 255, 255);
myGLCD.setFont(SevenSegNumFont);
for (int i=0; i<250; i++){
myGLCD.printNumI(i,20,90,3,48); // Print Integer Number, x=20, y=90, 4 characters, 48= "0" (filler)
}
myGLCD.setColor(255, 127, 0);
myGLCD.setFont(Inconsola);
for (float f=0; f<10000; f=f+0.01){
myGLCD.printNumF(f,2,20,170,46,8,48); // Print Floating Number 2 decimal places, x=20, y=170, 46 = ".", 8 characters, 48= "0" (filler)
}
}
I assume that it's the SPI communications with the ILI9341 that is the bottleneck.
Last edited: