shell for arm processor.

Jul 06, 2006 7 Replies

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kris2552 20 years ago

Hi all! I am newbie to embedded. I was asked to create a simple shell for arm processor with 4x20 Lcd display. Basically I dont have any idea about shell. i have googled abt shell and understood that its a command line interpreter. I need to diplay on the lcd and need to execute some simple commands like renaming file,ls, making a directory etc....File system has already been there on the board. i want to know how framebuffer is allocated and some information about command database (i suppose its a structure that contains command name and fucntion pointer for correspondign command). i dont have any OS and need to write a plain C code.

Appreciate any suggestions,or any help ,any related site addresses.....

Thanq all, Kris.

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Tauno Voipio 20 years ago

Homework / study project?

Basically, you have three tasks:

- create keyboard interface and driver for it, - create display interface and driver for it, - create the command interpreter and line I/O handlers.

A framebuffer is a memory area allocated to represent the display surface of a graphic display. The actaul implementation depends on the hardware intreface you have at hand for the display unit.

If you have a graphic display (which I doubt, due to the

4 x 20 specification), you need also to create the fonts and bit-block-transfers (usually called blits) to copy the font patterns to the proper areas of the framebuffer.

HTH

Tauno Voipio tauno voipio (at) iki fi

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Pete Fenelon 20 years ago

RTFM. Or in this case "Firmware Demystified" by Sutter. When you've read and understood that, come back with questions that aren't "do my project for me".

pete

pete@fenelon.com "That is enigmatic. That is textbook enigmatic..." - Dr Who "There's no room for enigmas in built-up areas." - N Blackwell

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kris2552 20 years ago

Hi Pete,

H> kris2552 wrote:

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kris2552 20 years ago

Hi Tauno Voipio,

Thank you very much for your detailed reply and thank you for ur time. I have both lcd and keyboard drivers with me and the present task is to create that command line interpreter.may I get any suggestions regarding that aspect...how to proceed so that i can get a better idea ......

Thank you, Kris.

Tauno Voipio wrote:

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Tauno Voipio 20 years ago

(-- top-posting corrected --)

You did not respond to my first question - so I'll repeat it:

Homework / study project?

Tauno Voipio tauno voipio (at) iki fi

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Iyed.Bennour 20 years ago

Hi, You are using Linux (frame buffer) so you can use the busybox that includes a shell and many of the most used unix commands its a great tool box. Check it out at busybox.net

Regards, Iyed Bennour Embedded systems eng> Hi all! I am newbie to embedded. I was asked to create a simple shell

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kris2552 20 years ago

Hello, Its a part of my Training work in my college..

Thanq.

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