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Altera_Forum
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20 years ago

msec Interval task

I need to control some peripherals at a regular interval ( usec resolution). From what I've read, it looks like an ISR is the only way to go. Are there any examples of reasonably (i.e., an adequate interval interrupt is available) portable solutions to this problem? I fear a good portion of my code will end up in kernel space, with the userland portion simply IOCTL'ing commands/data in/out.

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  • Altera_Forum's avatar
    Altera_Forum
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    20 years ago

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    originally posted by mikewest@Oct 11 2005, 11:56 PM

    i need to control some peripherals at a regular interval ( usec resolution). from what i've read, it looks like an isr is the only way to go. are there any examples of reasonably (i.e., an adequate interval interrupt is available) portable solutions to this problem? i fear a good portion of my code will end up in kernel space, with the userland portion simply ioctl'ing commands/data in/out.

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    It&#39;s probably best to add your own timer in SOPCBuilder so you won&#39;t mess with any of the system timers. It&#39;s fairly easy to write your own kernel module with an ISR. I wrote mine with the help of lwn linux device drivers. third edition (http://lwn.net/kernel/ldd3/).

    Hope this helps.