LCD

On this page, you will find all the information needed to use Liquid Crystal Display (LCD) with your Armadeus board.

Hardware interface

LCDs can be divided into 2 main categories:

• "intelligent" LCD with a built-in controller
• LCD without controller

LCDs with integrated controller

• your LCD has a built-in controller with a parallel interface -> usage of i.MXL LCD pins as GPIOs and emulation of a PC parallel port to reuse existing software
• your LCD has a built-in controller with a serial interface (not supported yet)

LCDs without controller

These LCDs can be used with i.MX internal LCD controller, ie direct connection between LCD & i.MX pins. Tested LCDs are:

• Sharp LQ043 (480x270) TFT (Default 256k colors TFT for Armadeus Project)
• LW700AT (800x480) TFT
• Microtips MTF-035 (320x240) TFT
• Motorola A910 (240x320) TFT
• Sharp LQ057 (320x240) TFT

5v logic one:

• Tianma STN Monochrome 320x240
• Ampire/xxx STN Monochrome 240x128

Software API

Generally on Linux you would need a kernel part (=driver) and a user space part (=library) to control and use your LCD in a reusable way.

Built-in Controller	Interface	Driver	Library	Working?
HD44780	// 4 bits data	GPIO_Driver + PPDEV	LCD4Linux	Yes
KS0108	// 8 bits data	GPIO_Driver + PPDEV	??	Not tested
None (use i.MXL one)	RGB datas + control signals	FrameBuffer	SDL / Qt / ...	Yes

LCDs with controller

Parallel interface

Driver: Use Linux Armadeus GPIO driver with it's PPDEV emulation User space: Use either LCD4linux or Lcdproc depending on your application

Text: - HD 44780 (tested with GpioDriver driver (+ppdev emulation) and LCD4Linux

Graphic: - KS0108 (Nico and Juju have one sample, not tested yet because LC4Linux don't support it) - ?

User space tools / library found to control // LCD

LCD4linux Mainly used to display system information, not very customizable for user GUI