topic [i.MX6] Using edma to clear RAM in i.MX Processors

[i.MX6] Using edma to clear RAM

m_eladouly — Thu, 30 Aug 2018 16:57:58 GMT

Hello,

I need to clear a large part of RAM (~100MB) and I need to do it fast.

Is there a way to clear it using eDMA?

If yes, what shall I set the source to? And what are the attributes?

Thank you.

Re: [i.MX6] Using edma to clear RAM

igorpadykov — Thu, 30 Aug 2018 23:44:09 GMT

Hi Mohamed

one can look at i.MXRT1050 MCUXpresso SDK example:

boards/../driver_examples/edma/memory_to_memory

Welcome | MCUXpresso SDK Builder

Best regards
igor
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Re: [i.MX6] Using edma to clear RAM

m_eladouly — Sun, 02 Sep 2018 09:00:48 GMT

Hello Igor,

Thank you for your answer.

The example explains how to copy from a source address to a destination address with the same size.

Is it possible to have a source a destination with different sizes? This will be helpful in clearing the large size in RAM (~100MB).

Thank you.

Re: [i.MX6] Using edma to clear RAM

igorpadykov — Mon, 03 Sep 2018 11:47:58 GMT

Hi Mohamed

I think source and destination with different sizes also can be used, try to set SOFF

TCD Signed Source Address Offset (TCDa_SOFF) to zero.

Best regards
igor

Re: [i.MX6] Using edma to clear RAM

m_eladouly — Tue, 04 Sep 2018 09:46:11 GMT

Hello Igor,

I'll try it, thank you a lot for your help.