Difference between revisions of "LCD"
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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=== | |
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
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* 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 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) | + | * 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.
Contents
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 ??
