MQX Software SolutionsのトピックRe: DMA Driver Framework basics

DMA Driver Framework basics

fernandoamorim — Wed, 26 Mar 2014 14:24:56 GMT

Hello,

I'm new in the Freescale world and I'd like to know if anybody can help me on the DMA Driver Framework. I'm using CW 10.5, MQX 4.1 and a TWR-K60 KIT. I need to send an SPI message every 50 microsseconds and I think that with the DMA driver it's possible to do that, but I'm not familliar (yet) with the structs and functions of the I/O drivers.

I've already read the MQX I/O User Guide. Does anybody have an example using these DMA functions (dma_init, dma_channel_claim, dma_transfer_submit, etc.) so I can understand how to implement them?

Thanks in advance.

Fernando

Re: DMA Driver Framework basics

Wlodek_D_ — Thu, 27 Mar 2014 08:27:02 GMT

Hello,

Thank you for your post, however please consider moving it to the right community place (e.g. MQX Software Solutions ) to get it visible for active members.

For details please see general advice Where to post a Discussion?

Thank you for using Freescale Community.

Re: DMA Driver Framework basics

fernandoamorim — Thu, 27 Mar 2014 10:56:28 GMT

OK, already moved.

Fernando

Re: DMA Driver Framework basics

soledad — Fri, 28 Mar 2014 21:59:45 GMT

Hello Fernando,

Please check the below thread and let me know if this helps,

SPI DMA problems

In addition you can find some examples at the next path:

C:\Freescale\Freescale_MQX_4_1\mqx\examples

Regards

Sol

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

Re: DMA Driver Framework basics

fernandoamorim — Mon, 31 Mar 2014 11:27:49 GMT

Hello Sol,

I've already looked at this thread, but they are accessing the low level registers there. What I'm trying to do is to use the DMA abstratction layer functions (dma_init, dma_channel_claim, dma_transfer_submit, etc.) but unfortunately I didn't found anything on the web. In the "C:\Freescale\Freescale_MQX_4_1\mqx\examples" folder there are no examples using these functions either.

Fernando

Re: DMA Driver Framework basics

ilkea — Fri, 11 Jul 2014 13:03:25 GMT

Hi Fernando,

I am in trouble with same issue.Have you found dma code?

Re: DMA Driver Framework basics

fernandoamorim — Fri, 11 Jul 2014 13:20:21 GMT

ilke,

I've downloaded the Kinetis SDK drivers (beta), there is an example there on how to use the SPI with DMA.

Hope this helps,

Fernando

Re: DMA Driver Framework basics

ilkea — Fri, 11 Jul 2014 13:24:43 GMT

Thank you Fernando,

I will not use SPI, I am planning to write data to flexbus via dma but this sample code may give me idea,

It will be great if it is possible for you to post it here,

Thanks again,

İlke