From: Sergei Organov <osv@javad.com>
To: ecos-discuss@sources.redhat.com
Subject: [ECOS] Re: DSR stops running after heavy interrupts. Spurious Interrupt!
Date: Tue, 11 Apr 2006 04:07:00 -0000 [thread overview]
Message-ID: <e1fa2d$omn$1@sea.gmane.org> (raw)
In-Reply-To: <MDAEMON-F200604101649.AA492021md50000000042@toptech.com>
"Joe Porthouse" <jporthouse@toptech.com> writes:
> Ok, found the source of the Spurious Interrupts, (your really going to love
> this one).
[...]
> Clearing this interrupt occurs if you read from the Receiver FIFO, set the
> FCR[RESETRF] bit or A NEW START BIT IS RECEIVED!!!
>
> So if the RX FIFO is below the trigger point and a timeout occurs an IRQ
> request is generated, but if a new start bit is detected the IRQ request is
> then immediately cleared. :(
>
> Wow an interrupt that can clear its own IRQ request before service occurs!!!
> That would surely cause a Spurious Interrupt.
Sounds like yet another piece of broken hardware design from Intel, --
they failed to deliver reasonable RS232 implementation at the early
days of PC, and still fail to do it right in 20 years :(
-- Sergei.
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next prev parent reply other threads:[~2006-04-11 4:07 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-05 21:09 [ECOS] DSR stops running after heavy interrupts Joe Porthouse
2006-04-06 6:49 ` Andrew Lunn
2006-04-06 9:02 ` Stefan Sommerfeld
2006-04-06 21:09 ` Joe Porthouse
2006-04-06 21:19 ` Andrew Lunn
2006-04-08 4:18 ` [ECOS] DSR stops running after heavy interrupts. Bug found? Joe Porthouse
2006-04-09 12:33 ` Andrew Lunn
2006-04-10 4:50 ` [ECOS] " Sergei Organov
2006-04-10 9:36 ` Nick Garnett
2006-04-10 10:44 ` Sergei Organov
2006-04-10 10:59 ` Nick Garnett
2006-04-10 11:15 ` Sergei Organov
2006-04-10 13:20 ` Joe Porthouse
2006-04-10 16:41 ` [ECOS] Re: DSR stops running after heavy interrupts. Spurious Interrupt! Joe Porthouse
2006-04-10 17:20 ` Nick Garnett
2006-04-10 17:44 ` Andrew Lunn
2006-04-10 20:49 ` Joe Porthouse
2006-04-11 4:07 ` Sergei Organov [this message]
2006-04-11 8:31 ` Nick Garnett
2006-04-11 4:15 ` Sergei Organov
2006-04-11 8:43 ` Nick Garnett
2006-04-13 7:58 ` [ECOS] How to use the ARM directive DCB in Vectors.S Birahim Larou Fall
2006-04-13 13:28 ` Andrew Lunn
2006-04-13 13:32 ` Birahim Larou Fall
2006-04-21 7:40 ` [ECOS] " Daniel Néri
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