Did you know LQ has a Linux Hardware Compatibility List?
Go Back > Forums > Linux Forums > Linux - Software > Linux - Kernel
User Name
Linux - Kernel This forum is for all discussion relating to the Linux kernel.


  Search this Thread
Old 10-29-2012, 08:08 AM   #1
LQ Newbie
Registered: Jun 2012
Location: Pune India
Distribution: Ubuntu
Posts: 4

Rep: Reputation: 0
Unhappy IRQ not received properly in keypad

Hi ,

I am using a keypad whose press event is mapped to irq 37 and released event is mapped to irq 38.

But in the below scenario something weird happens,
Press key "A" recived the press irq (i.e 37) keeping the key "A" pressed i pressed the another key "B" again recieved the press irq 37 but when the key "B" released didn't recived released irq but received the press irq i.e (irq 37).

At the end when released the key "A" got the release irq (i.e 38) properly.

Can any one explain what may be the reason?

Old 10-29-2012, 10:39 AM   #2
Registered: Feb 2004
Location: SE Tennessee, USA
Distribution: Gentoo, LFS
Posts: 5,725

Rep: Reputation: 1294Reputation: 1294Reputation: 1294Reputation: 1294Reputation: 1294Reputation: 1294Reputation: 1294Reputation: 1294Reputation: 1294
Probably because the keyboard perceived that key-status had changed and that a key was still down.


irq, kernel source, keypad

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
20KB UDP message is not properly received zvivered Red Hat 1 05-26-2012 11:28 AM
UNIQ IRQ and Shared IRQ...I want to make Shared IRQ routin chxooi Linux - Hardware 1 06-12-2010 07:30 AM
kernel: usbhid: input irq status -75 received Spoof Linux - Hardware 2 12-10-2008 06:39 AM
Get "input irq status -71 received" when usb device plug out masue Linux - Hardware 1 07-17-2008 03:22 AM
saitek usb keyboard "input irq status -32 received" boffman Linux - Hardware 3 12-30-2007 08:46 PM

All times are GMT -5. The time now is 03:36 AM.

Main Menu
Write for LQ is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration