Presentation¶

This page presents a library to use a SMARTGPU intelligent embedded graphics processor with a 2.4" touch screen from vizic technologies: http://vizictechnologies.com/#/smart-gpu/4554296549 (http://www.vizictechnologies.com) The LCD module features are :

• 2.4“ LCD capable of displaying 262,144 colors.
• Easy 5 pin interface to any host device: VCC, TX, RX, GND,   RESET.
• On-board uSD/uSDHC memory card adaptor compatible with   FAT(windows PC), Support up to 32GB for storing images and   text.
• Integrated File management/Data logger functions(Create, Read, Write, etc).
• Integrated Touch screen driver(controller), 10 bit accuracy touch.
• Sleep mode.
• 2 General purpose Digital Output pins on board.
• BaudRate speed up to 2Meg bps, 8 bits, no parity, 1 stop bit.
• 5V and 3V3 I/O compatible,3V3 power supply.
• External reset switch
• Low-cost LCD display graphics user interface solution.
• Comprehensive set of built in high level graphics functions and algorithms that can draw lines, circles, text, and much more.
• 8 different fonts and sizes.
• compatible with any microcontroller(8051,pic,AVR,ARM,mbed,FPGAs,PC) and development boards with a UART.

SMARTGPU intelligent embedded graphics processor unit¶

Comparison of processors loads:¶

Connecting the SMARTGPU¶

• You will need to power the screen with 3.3V.
• You can use either the 3.3V I/O pins or the 5V tolerant I/O pins for serial communication.
• If you use an external power source, make sure the mbed ground and external power ground are linked otherwise the serial commands will not be received correctly by the screen.
• Use one of the three Serial pairs of pins (p9, p 10) (p13, p14) or (p27, p28) from the mbed to connect them with the SMARTGPU(up to 3 SMARTGPUs can be connected simultaneously to mbed!).
• Use one pin for reseting the screen.
• The way to use the library is SMARTGPU lcd(p13,p14,p15); (TX,RX,Reset)

SMARTGPU mbed Library¶

You can import the SMARTGPU mbed Library from here :

Once it is imported to your program folder, just insert the #include "SMARTGPU.h" in your main.cpp and create the object with SMARTGPU lcd(p13,p14,p15); (TX,RX,Reset)

Example Code¶

//main.cpp
#include "mbed.h"
#include "SMARTGPU.h"

SMARTGPU lcd(p13,p14,p15);        //(TX,RX,Reset);
  
int main(){  
 lcd.reset();                    //physically reset SMARTGPU
 lcd.start();                    //initialize the SMARTGPU processor
 while(1){                       //loop forever
  lcd.erase();                                         //erase screen
  lcd.putPixel(300,200,CYAN);                          //draw a pixel
  lcd.drawLine(50,50,150,200,WHITE);                   //draw a line
  lcd.drawRectangle(10,10,200,180,RED,UNFILL);         //draw a rectangle
  lcd.drawCircle(160,120,50,GREEN,UNFILL);             //draw a circle
  lcd.drawTriangle(15,15,200,210,180,70,BLUE,UNFILL);  //draw a triangle
  lcd.putLetter(100,100,MAGENTA,FONT3,TRANS,'E');      //write a single letter 'E'
  lcd.imageSD(0,0,"hydra320");                         //Open image "hydra320.bmp" stored on the microSD card
  lcd.string(10,10,300,220,YELLOW,FONT3,TRANS,"String test for SMARTGPU");  //write a string on the screen
  lcd.stringSD(5,50,300,230,MAGENTA,FONT3,TRANS,BEGINNING,ALLCONTENTS,"text1");  //call the text file "text1.txt" previously stored on the micro SD card
 }
}

Videos¶

Images and microSD contents could be downloaded from here: http://vizictechnologies.com/#/software-demos-sg/4554679040

Demos & Source Code¶

To make it simpler, you can import those demos 100% ready to compile and load:

Beginner:¶

Medium:¶

Advanced:¶

Work in progress¶

• The library need some extra documentation, but it's 100% functional
• Be sure to post any bug in case of.

Notes¶

• Images and microSD contents used on some examples could be downloaded from here: http://vizictechnologies.com/#/software-demos-sg/4554679040 "SMARTGPUmbedExamples.zip"
• Feel free to use the library and comment!