i.MX6 SDMA Usage

kaangencay — Thu, 21 Sep 2017 12:42:52 GMT

Hello,

In our project we use an Audio Codec to transmit and receive voice data. We have to use DMA instead of SSI FIFO. Because SSI has 15x32bit FIFO, it means it keeps about 1 ms voice data so we don't want to be occured interrupts every 1 ms. I understand that I have to use Peripheral DMA Units Copy Mode for this requirement.

In i.MX6 Reference Manuel document 55.4.12.2.7 section, it says "the peripheral DMA unit has a copy mode that is used when data transfers do not involve SDMA general registers. Data is read from the source target at a PSA address, stored in PD, and then automatically flushed to the destination target at the PDA address."

What do I understand? Is it not required to use SDMA scripts? Or is it used anyway?

Best regards,

Kaan

Re: i.MX6 SDMA Usage

Carlos_Musich — Thu, 05 Oct 2017 18:07:15 GMT

Hi Kaan,

all the automatic functions of SDMA are scripts are governed by the script, so scripts are used in all cases.

Regards,
Carlos

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i.MX6 SDMA Usage

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