Re: [ECOS] cyg_interrupt_disable/enable question

[Gary Thomas <gthomas at ecoscentric dot com>]

On Sat, 2002-09-21 at 12:03, andy.tenka@delphiauto.com wrote:
> 
> 
> One followup question:
> 
> Does cyg_disable_interrupt also mask the scheduler interrupt (ie, disables the
> scheduler)?

No.

> Thanks.
> 
> 
> 
> 
> 
> Gary Thomas <gthomas@ecoscentric.com> on 09/21/2002 12:52:09 PM
> 
> 
> To:   Andy Tenka/DELCO@DELCO
> cc:   eCos Discussion <ecos-discuss@sources.redhat.com>
> 
> Subject:  Re: [ECOS] cyg_interrupt_disable/enable question
> 
> 
> 
> On Sat, 2002-09-21 at 10:46, andy.tenka@delphiauto.com wrote:
> >
> >
> > Do cyg_interrupt_enable and cyg_interrupt_disable always have to have a 1-1
> > correspondence?
> >
> > In other words, if we call cyg_interrupt_disable twice, and call
> > cyg_interrupt_enable once, will the
> > interrupts be enabled?  (I realize that this is not a clean thing to do, this
> is
> > just an academic question).
> 
> These functions are not "tied" in any way.
>   HAL_ENABLE_INTERRUPTS() - enables the interrupts, no matter what
>   HAL_DISABLE_INTERRUPTS() - disables them, no matter what
> 
> If you want to disable interrupts and then restore the previous
> interrupt state, use this sequence:
>   cyg_uint32 old;
>   HAL_DISABLE_INTERRUPTS(old);
>     ...
>   HAL_RESTORE_INTERRUPTS(old);
> 
> 
> Note: this is often not necessary - simply disabling scheduling is
> often a better choice:
>   cyg_scheduler_lock();
>     ...
>   cyg_scheduler_unlock();
> 
> --
> ------------------------------------------------------------
> Gary Thomas                  |
> eCosCentric, Ltd.            |
> +1 (970) 229-1963            |  eCos & RedBoot experts
> gthomas@ecoscentric.com      |
> http://www.ecoscentric.com/  |
> ------------------------------------------------------------
> 
> 
> 
> 
> 
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> Subject: Re: [ECOS] cyg_interrupt_disable/enable question
> From: Gary Thomas <gthomas@ecoscentric.com>
> To: andy.tenka@delphiauto.com
> Cc: eCos Discussion <ecos-discuss@sources.redhat.com>
> In-Reply-To: <05256C3B.005C7509.00@notes.delphiauto.com>
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> 
> |--------------------------------------->
> |USTRYG98/us/delphiauto                 |
> |USTRYH99/us/delphiauto                 |
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> |USKOKHM1/DELCO                         |
> |USKOKM04/DELCO                         |
> |--------------------------------------->
>   >---------------------------------------|
>   |09/21/2002 12:58:29 PM - 09/21/2002    |
>   |12:58:30 PM                            |
>   |09/21/2002 12:58:33 PM - 09/21/2002    |
>   |12:58:34 PM                            |
>   |09/21/2002 12:58:34 PM - 09/21/2002    |
>   |12:58:35 PM                            |
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>   |12:58:30 PM                            |
>   >---------------------------------------|
> 
> 
> 
> 
> 
> 
> regards,
> 
> Andy Tenka
> Delphi Automotive Systems
> (765)451-8777
> Andy.Tenka@delphiauto.com
> 
> 
> 
> -- 
> Before posting, please read the FAQ: http://sources.redhat.com/fom/ecos
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-- 
------------------------------------------------------------
Gary Thomas                  |
eCosCentric, Ltd.            |  
+1 (970) 229-1963            |  eCos & RedBoot experts
gthomas@ecoscentric.com      |
http://www.ecoscentric.com/  |
------------------------------------------------------------


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