interrupt handling

mp4-10 · 02-07-2005, 06:40 AM

HI,
I wrote module which detects interrupts on RS232 port, it works ok, but how can I detect these interrupts in my application and not only in kernel.
Is there any way to send some signal(like betwen tasks in linux) to my application from kernel when interrupt is occured.

I hope someone can help me!!!!
Bye

jim mcnamara · 02-07-2005, 10:14 AM

Consider the idea of polling - look into select(), which I/O drivers can talk to in order to say 'I have data'.

AngryLlama · 02-08-2005, 12:32 AM

or use a signal. SIGUSR1 and others are provided for user signals.

Hko · 02-08-2005, 05:31 PM

Quote:

Originally posted by mp4-10
I wrote module which detects interrupts on RS232 port, it works ok, but how can I detect these interrupts in my application and not only in kernel.
Is there any way to send some signal(like betwen tasks in linux) to my application from kernel when interrupt is occured.

Are you sure you want to kernel programming for this? AFAIK it's not needed. You can have a program block (sleep) until a control line of the serial changes from 1 --> 0 or from 0 --> 1. See here: http://www.linuxquestions.org/questi...71#post1448471

To have your program notified asynchronously you can fork() a child off that'll wait blocking for some serial port event. And send SIGUSR1 to its parent.

novice_din · 02-08-2005, 10:42 PM

you can you SIGIO which send a signal if there is I/O activity

mp4-10 · 02-14-2005, 06:13 AM

Hi,
I tried to use SIGIO , it works but interrupts are detected only if Enter ASCII sequence is sent to RS232.
How can I use it to handle any ASCII character not only ENTER.