DSPI DMA Issue

Steve,

The flag is the "precise increment" flag. It is
used to throttle the dma engine on just dumping data into
the fifos of the DSPI.

-Aaron

-----Original Message-----
From: ColdFirelists.wildrice.com [mailto:ColdFirelists.wildrice.com]On
Behalf Of Steve Joiner
Sent: Tuesday, May 09, 2006 8:42 AM
To: aaron durbin
Subject: [ColdFire] DSPI DMA Issue


I tried posting this to the Coldfire forum on the Freescale
site, but I
didn't get a response.  I'm hoping I'll have better luck
here.

I'm trying to convert the Linux DSPI driver to use DMA.  I
found the
DSPI_DMA_Example.zip code posted on the Freescale forum, and
it was
helpful.  In particular, there's some magic on lines 152
and 171 of
DSPI_Drv.c in the flags argument to MCD_startDma(), and it
looks like this:

MCD_SINGLE_DMA | 0x40

That 0x40 helped me solve one of my problems but introduced
another.
However, I don't know how to proceed since I have no idea
what the 0x40 is.
I can't find it documented anywhere.  Can anyone point me
in the right
direction on this?

Thanks,
Steve
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Aaron,

Thanks for the information.  Can you tell me where the flag
is documented?

I need to understand how it works because it fixed my
problem of "throttling
the dma engine," but introduced a problem of causing
all DMA transfers after
the first to fail.

Thanks,
Steve

On 5/9/06, aaron durbin <aarondurbinbasler.com> wrote:
>
> Steve,
>
> The flag is the "precise increment" flag.
It is used to throttle the dma
> engine on just dumping data into the fifos of the DSPI.
>
> -Aaron
>
> -----Original Message-----
> From: ColdFirelists.wildrice.com [mailto:ColdFirelists.wildrice.com]On
> Behalf Of Steve Joiner
> Sent: Tuesday, May 09, 2006 8:42 AM
> To: aaron durbin
> Subject: [ColdFire] DSPI DMA Issue
>
>
> I tried posting this to the Coldfire forum on the
Freescale site, but I
> didn't get a response.  I'm hoping I'll have better
luck here.
>
> I'm trying to convert the Linux DSPI driver to use
DMA.  I found the
> DSPI_DMA_Example.zip code posted on the Freescale
forum, and it was
> helpful.  In particular, there's some magic on lines
152 and 171 of
> DSPI_Drv.c in the flags argument to MCD_startDma(), and
it looks like
> this:
>
> MCD_SINGLE_DMA | 0x40
>
> That 0x40 helped me solve one of my problems but
introduced another.
> However, I don't know how to proceed since I have no
idea what the 0x40
> is.
> I can't find it documented anywhere.  Can anyone point
me in the right
> direction on this?
>
> Thanks,
> Steve
>
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> To Subscribe send a message to:      ColdFire-OnLists.Wildrice.com
> To Unsubscribe send a message to:    ColdFire-OffLists.Wildrice.com
> For further information, visit:      <http://www.Wild
Rice.com/ColdFire/>
>
>
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>
>
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