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SPI to control register data transfer using DMA
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SPI to control register data transfer using DMA

PDES posted on 23 Nov 2011 7:29 AM PST
Member
10 Forum Posts


Could I use DMA for read a 16 bit data from a master SPI and transfer the data on two 8 bit control registers?
Since the SPI works at very low frequency (1MHz), I need to update both registers only at the end of the reading procedure.
It is enough only one DMA channel or the procedure requires two different transfers ( SPI->RAM, RAM->control register), thus two DMA channels?

Thanks in advance
 

Re: SPI to control register data transfer using DMA

kmmankad posted on 23 Nov 2011 09:54 AM PST
Top Contributor
268 Forum Posts

I think there was(is? but I couldnt find it.Maybe one of the employees can direct you to it) appnote on SPI with DMA.I'm not entirely sure,but I faintly recall there was one.

Re: SPI to control register data transfer using DMA

Gautam Das posted on 24 Nov 2011 12:34 AM PST
Cypress Employee
742 Forum Posts

Hi PDES, kmmankad

 

The code example on SPI Transfer using DMA is attached. This should give you a fair understanding on the usage of DMA with SPI.



Re: SPI to control register data transfer using DMA

Gautam Das posted on 24 Nov 2011 12:35 AM PST
Cypress Employee
742 Forum Posts

The associated project is attached.



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