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Mail Archives: djgpp/2004/06/10/10:09:42

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Message-ID: <000e01c44ef4$7d941520$0d01a8c0@josepmariaxp>
From: "turomas" <josepmaria AT turomas DOT com>
To: <djgpp AT delorie DOT com>
References: <001701c44ed6$30907d40$0d01a8c0 AT josepmariaxp> <200406101615 DOT 35163 DOT pavenis AT latnet DOT lv>
Subject: Re: Troubles with hard interrupts aand HDD
Date: Thu, 10 Jun 2004 16:09:05 +0200
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Reply-To: djgpp AT delorie DOT com

I have caugth HDD interrupt and I put there my own interrupt wich calls HDD
interrupt. I can see that delay comes when HDD interrupt has finished, and
only with smartdrv installed. May be DMA?

Now we have began to work with rtlinux. But now I have to solve this problem
in dos.



> On Thursday 10 June 2004 13:32, turomas wrote:
> > I am developing a CNC. I use a hard interrupt every 500 micro seconds. I
> > have used Irq9 and Irq0 too. It works fine but when I use HDD the
latency
> > gets back to 2,5 ms. Can somebody help me.
>
> Perhaps HDD interrupt handling could take rather much time in DOS or
somewhere
> interrupts are getting masked for up to 2.5 ms. Also switching between
real
> and protected mode requires time.
>
> I myself would try to use some real time operating system for such task
(see
> for example http://www.rtai.org).
>
> Andris
>
>


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