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08-25-2009
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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 |
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10-01-2009
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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? |
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10-01-2009
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You're getting closer.
 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. |
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3 Weeks Ago
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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; 3 Weeks Ago at 12:20 PM.. |
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