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Receiving buffer address setup when using ADC to DMA

 
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naughty_mark



Joined: 29 Aug 2012
Posts: 97

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Receiving buffer address setup when using ADC to DMA
PostPosted: Tue Jan 31, 2017 5:32 pm     Reply with quote
Hi Guys,

I am using dsPIC33ECP512MU814 micro with CCS compiler v5.0.30.
What I am trying to do is read 8 ADC channels (4 channels Simultaneously each time) and let DMA fill those readings to my buffer. I read Microchip User Manual Section 22 about DMA for this chip, following its example code. However, the address of receiving buffer needs to be setup properly, and I have example code below:
Code:

__eds__ unsigned int BufferA[32] __attribute__ ((eds,space(dma)));

DMA5STAL = __builtin_dmaoffset(BufferA);
DMA5STAH = 0x0000;

I would like to know for interpret those code into CCS format, what should I write? Embarassed I understand if variable needs to align with some address such as
Code:
unsigned int dmaBufferA[32] __attribute__((aligned(0x1000)));

But I don't understand what "eds" mean, and how to interpret things like "eds", "space(dma)", "builtin_dmaoffset".....
Could anyone help?

Regards
Mark
Ttelmah



Joined: 11 Mar 2010
Posts: 19529

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PostPosted: Wed Feb 01, 2017 3:57 am     Reply with quote
It's saying to put the value into the extended data space.
Realistically ask CCS. The compiler does support quite a lot of 'undocumented' settings to control things like this, and it is quite possible that it'll even accept __eds__. However the people who will know how to do this are CCS themselves. Smile
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