Tag Archives: colour lcd

A Basic Touch-screen driver for STM32

Today I completed the basic touch screen driver. The task included Learning the "Theory of Operation" of 4 wire resistive touch screens. Learning the about the working of AD7843 touch screen controller IC. Learning about the SPI peripheral of STM32 Writing basic SPI drivers (to init, read and write to SPI1) Writing basic drivers to command and read AD7843 touch screen controller. Filtering the touchscreen data using Median Filter to remove noise. Learning about the three point touch screen calibration method. Writing a routine to convert touch screen co-ordinate (ranges from 0-4095 in X and Y direction) to LCD co-ordinates. Finally ploting a cross-hair at the touched point. The final result is shown below. Then I moved on to implement a GUI 3D Button. After that I went to try a “Free Hand Drawing” application. And what I made is shown in the video below.

Got the TFT LCD + STM32F103VE MCU Up and Running !

Hi All, I was working to interface 320×240 pixel TFT LCD based on ILI9325 controller with my 32 bit ARM MCU (STM32F103VE). Got to digest the whole datasheet of ILI9325, Learn about the FSMC (Flexible Static Memory Controller). Finally succeeded in initializing the LCD and writing to the GRAM. Then ported a part of ProGFX (Text and Font unit) to this new platform. Finally was able to write text on the LCD Screen. This is part of a bigger project to port BASIC language for STM32 MCU based single board computer with on board LCD and SD card. The user then can program in BASIC language, store .BAS files on SD card and execute on board. Something like a power packed Arduino for the modern world (TFTs, SD Card and Multimedia!) Now the next part is to get a basic GUI up and running to view and load BAS files from SD card. After that main task of porting basic begins!