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Parallella Community • View topic - dma multicast?

dma multicast?

Any technical questions about the Epiphany chip and Parallella HW Platform.

Moderator: aolofsson

dma multicast?

Postby notzed » Fri Aug 22, 2014 11:24 am

So according to an earlier response from Andreas there was some dma multicast example written but it hasn't shown up anywhere (that i can find).

I have tried a few times myself with no success, but I would be interested in experimenting with this feature - if it is functional.

Maybe during the current sdk overhaul work it can be added to the TODO list?
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Re: dma multicast?

Postby timpart » Mon Aug 25, 2014 9:42 am

Based on this it should work so long as you avoid the chip problem with multicast messages not going south and don't use double word transfers. You can't combine it with message mode interrupt at the far end though (clash of ctrlmode usage). Not sure if anyone has actually done DMA and multicast. I've only seen an example where written by core processor, not DMA.

Tim
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Re: dma multicast?

Postby notzed » Tue Aug 26, 2014 12:35 am

notzed
 
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Re: dma multicast?

Postby timpart » Tue Aug 26, 2014 7:45 am

Can't find the example. Memory must be playing tricks, sorry. Only other thought that comes to mind is that since the CTRLMODE is in the CONFIG register the compiler might be saving and restoring it somewhere in the surrounding function.

Tim
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Re: dma multicast?

Postby notzed » Thu Aug 28, 2014 2:41 am

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