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On this page, you will find all the informations needed to use LCD on Armadeus.
On this page, you will find all the information 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


Two possibilities:
===LCDs with integrated controller===
* LCD can be used with i.MX LCD controller -> direct connection to i.MX LCD pins (ex: [[MotLCD]] )
* your LCD has a built-in controller with a parallel interface:
* LCD has a built-in controller with a parallel interface -> usage of i.MX LCD pins as GPIOs and emulation of a PC parallel port to reuse existing software
** -> usage of i.MX LCD pins as GPIOs and emulation of a PC parallel port to reuse existing software
* ?? Should we support serial interface ?.
* your LCD has a built-in controller with a serial interface:
** -> not supported yet


== Supported LCD / Software API ==
===LCDs without controller===
=== Which LCD controller are we going to support (for parallel port/GPIO interface) ===
These LCDs can be used with i.MX internal LCD controller, ie direct connection between LCD & i.MX pins. Tested LCDs are:
* [[LQ043_Adapt | Sharp LQ043 (480x270) TFT ]] (old default APF9328Dev LCD, no more sold by Armadeus Systems)
* [[Chimey LW700 |LW700AT (800x480) TFT ]] (old default APF27Dev/APF51Dev LCD, no more sold by Armadeus Systems)
* [[Santek ST070015 |ST070015 (800x480) TFT ]] <strong> (Default APF27Dev/APF51Dev/APF28Dev 256k colors TFT sold by Armadeus Systems)</strong>
* [[MTF-T035|Microtips MTF-035 (320x240) TFT]]
* [[MotLCD|Motorola A910 (240x320) TFT]]
* [[LQ057|Sharp LQ057 (320x240) TFT]]
* [[Tianma_TM035|TM035 (320x240) TFT ]] (old default APF28Dev LCD, sold by Armadeus Systems)
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;"
! ''' Built-in Controller ''' || ''' Interface ''' || '''Driver''' || '''Library''' || '''Working?'''
|----------------
|  HD44780 || // 4 bits data || [[GPIO_Driver]] + PPDEV || LCD4Linux || style="background:#00ff55;" | Yes
|----------------
|  KS0108 || // 8 bits data || [[GPIO_Driver]] + PPDEV || ?? || style="background:#ddff00;" | Not tested
|----------------
|  ||  || || ||
|----------------
|  None (use i.MX one) || RGB datas + control signals || [[FrameBuffer]] || SDL / Qt / ... || style="background:#00ff55;" | 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


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


Graphic:
Graphic:
Line 22: Line 61:


[[LCD4linux]]
[[LCD4linux]]
Cool but mainly to display system informations, not very customizable for user GUI
Mainly used to display system information, not very customizable for user GUI
 
Lcdproc ??
(Not tested)
 
Other idea ??
 


[[Category:Hardware]]
[[Category:Displays]]
[[Category:LCD]]

Latest revision as of 16:43, 13 July 2015

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.MX 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:

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.MX 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

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