LCD: Difference between revisions
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On this page, you will find all the informations needed to use LCD | On this page, you will find all the informations needed to use Liquid Crystal Display (LCD) with your Armadeus board. | ||
== Hardware interface == | == 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 | * 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 tested yet): | ||
** | ** RS232 -> connect this serial interface to the 2nd serial port of the i.MXL. Don't forget to check signal level compatibility before ! | ||
** | ** SPI -> connect it to SPI port n°? | ||
===LCDs without controller=== | |||
These LCDs can be used with i.MXL internal LCD controller, ie direct connection between LCD & i.MXL pins. Tested LCDs are: | |||
* [[MTF-T035|Microtips 320x240 TFT]] <strong> (Default 256k colors TFT for Armadeus Project)</strong> | |||
* [[MotLCD|Motorola A910 240x320 TFT]] | |||
* [[LQ057|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. | |||
{| border="1" cellpadding="5" cellspacing="0" summary="LCD software APIs" | |||
|- style="background:#efefef;" | |||
! ''' Controller ''' || ''' Interface ''' || '''Driver''' || '''Library''' || '''Working?''' | |||
|---------------- | |||
| HD44780|| // || [[GPIO_Driver]] || Yes || | |||
|---------------- | |||
| || || || || | |||
|---------------- | |||
| || || || || | |||
|---------------- | |||
| || || || || | |||
|---------------- | |||
| || || || || | |||
|---------------- | |||
| || || || || | |||
|---------------- | |||
|} | |||
== | ===LCDs with controller=== | ||
=== | ====Parallel interface==== | ||
Driver: | |||
Use Linux Armadeus [[GPIO_Driver|GPIO driver with it's PPDEV emulation]] | |||
User space: | |||
Use either [[LCD4linux]] or Lcdproc depending on your application | |||
====Serial interface==== | |||
=====RS232==== | |||
Text: | Text: | ||
Revision as of 18:45, 7 September 2007
On this page, you will find all the informations 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 tested yet):
- RS232 -> connect this serial interface to the 2nd serial port of the i.MXL. Don't forget to check signal level compatibility before !
- SPI -> connect it to SPI port n°?
LCDs without controller
These LCDs can be used with i.MXL internal LCD controller, ie direct connection between LCD & i.MXL pins. Tested LCDs are:
- Microtips 320x240 TFT (Default 256k colors TFT for Armadeus Project)
- 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.
| Controller | Interface | Driver | Library | Working? |
|---|---|---|---|---|
| HD44780 | // | GPIO_Driver | 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
Serial interface
=RS232
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 Cool but mainly to display system informations, not very customizable for user GUI
Lcdproc ?? (Not tested)
Other idea ??
