Configure DMA for DAC with Processor Expert

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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.

[ProcessorExpert]

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

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

Richard.

[ProcessorExpert]

Hello,

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

best regards
Vojtech Filip
Processor Expert Support Team

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Here is my project

[ProcessorExpert]

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

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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.

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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.