How to read keys from USB keyboard on AT91SAM9260


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Operating Systems Linux How to read keys from USB keyboard on AT91SAM9260
# 1  
How to read keys from USB keyboard on AT91SAM9260

Hi Everyone,

I am using 2.6.26.3-olimex kernel(Embedded system) running on AT91SAM9260. I am using a Logitech USB keyboard.

It is detected as "/dev/input/event0".

I don't know how to detect key press events and read the keys?

Why can't I read the keys using scanf() like funtions?

Can anyone help me?

Regards,
Siva
# 2  
Your embedded system's kernel may not have been built with keyboard support, being an embedded system...
# 3  
Thanks for your response.

I have enabled the following options in the menuconfig file while building uImage.

Input Device Support --> Event Interface
Keyboards --> AT Keyboard
HID Devices --> USB Human Interface Device support
HID Devices --> PID device support
Special HID Drivers --> Logitech and Logitech force feedback

After booting the kernel, USB key board detected as "/dev/input/event0".

I don't know why I can't use this as stdin?

Am I missing some thing here?
# 4  
You're getting closer. Smilie

What kernel version? What options may depend on it. In my kernel at least, 2.6.27, you also need the <*>Generic Input Layer, under Input Device Support in Device Drivers.
# 5  
How to read keys from USB board

I have enabled Generic Input Layer, under Input Device Support in Device Drivers.

But still I can not use USB key board as stdin.

Have I missed something else?
# 6  
I'm reaching the limits of my knowledge here, I'm not sure how Linux decides what keyboard device to use with what physical terminal device. I do know that the keyboard does not literally become stdin -- that'd be an easy fix if it did, but the event interface reports raw key codes, not actual keystrokes. Instead linux pairs a physical keyboard with some sort of physical output device in order to create a terminal device to interact with.

I don't know what programs your embedded system actually has. I don't know what your embedded system actually is beyond what processor runs it. Your system may just not be configured to use it. The content of /etc/inittab, and the complete listing of /dev/, might be useful to figuring this out.

It'd also help if you replied more than once every three weeks.

Last edited by Corona688; 10-26-2009 at 02:20 PM..
# 7  
How to read keys from USB keyboard on AT91SAM9260

Thanks for your response.

I am using AT91SAM9260 controller with Linux 2.6.30.4 kernel.

I have attached my /etc/initab/ entries and /dev/ entries.

Please have a look into them and share your views.
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