topic Configure DMA for DAC with Processor Expert in Kinetis Microcontrollers

Configure DMA for DAC with Processor Expert

tmf — Fri, 07 Oct 2011 06:13:19 GMT

Configure DMA for DAC with Processor Expert

Description:

I have tried to configure CW10.1 using processor expert to transfer by DMA to the DAC.....

I have two data buffers, one is being DMA'd out to the DAC at a specified rate, while the other is being filled, once the buffer being transferred is done, it switches to the other one.

Its an audio application I am sending data to DAC at 32Khz..... So I would think I could use PIT or similar to trigger the DMA transfers.....

Can you walk me through the setup?

Send me demo code already doing this?

I have K60 Tower kit and CW10.1 fully updated.

Thanks.

This was posted on my support page and has not been looked at for 5 days from FREESCALE :smileysad:

Hope someone can help.

Re: Configure DMA for DAC with Processor Expert

ProcessorExpert — Fri, 07 Oct 2011 14:31:03 GMT

Hello,

you can find an example related to the DMA transfers on "Typical Usage" page in help of DAC_LDD component, the help is available through "Help" menu command from component´s pop-up menu.

Note:

You can also find a basic example project of using DAC_LDD and ADC_LDD in the following folder:

{CodeWarrior}\MCU\CodeWarrior_Examples\Processor_Expert\Kinetis\TWR-K40X256\DAC_ADC\

best regards
Vojtech Filip
Processor Expert Support Team

Re: Configure DMA for DAC with Processor Expert

tmf — Fri, 07 Oct 2011 15:01:46 GMT

I can get buffer to buffer DMA to happen, just declare 2 buffers in memory and move one to another..... BUT I can not get one memory buffer to go to the DAC, I will look at the examples you sent, the ones they give for examples in the CW help files do not help.

Thanks.

Re: Configure DMA for DAC with Processor Expert

tmf — Fri, 07 Oct 2011 23:07:36 GMT

So these worked fine, but DMA to the DAC still not working.....

Richard.

Re: Configure DMA for DAC with Processor Expert

ProcessorExpert — Tue, 11 Oct 2011 14:16:31 GMT

Hello,

could you please post here some simple demonstration project of your problem?

best regards
Vojtech Filip
Processor Expert Support Team

Re: Configure DMA for DAC with Processor Expert

tmf — Wed, 19 Oct 2011 19:15:54 GMT

Here is my project

Re: Configure DMA for DAC with Processor Expert

ProcessorExpert — Wed, 19 Oct 2011 23:41:20 GMT

Hello,

I think this issue was already solved within this thread:

https://community.freescale.com/message/97760#97760

Am I corect?

best regards
Vojtech Filip
Processor Expert Support Team

Re: Configure DMA for DAC with Processor Expert

tmf — Thu, 20 Oct 2011 00:23:29 GMT

Yes except for the timing issues, the PIT0 timer seems not to effect the output, I am trying to time the output to the DAC with PIT0....

Richard.