Can OMAP35x DMA event be held when disabling a DMA channel?

Tianhua Chu

Other Parts Discussed in Thread: OMAP3530

Hi,

I wonder what will happen if an external HW DMA request event has been received by DMA controller but not being processed by the channel yet, then the channel gets disabled by setting the "enable" bit? Can the request be held for a while until the channel gets re-enabled? And then get processed?

And if I understand properly, if the channel has been processing the event, it will be aborted and the event will be discarded?

Also, what if the DMA channel has source sync and buffer enbaled, suppose it shall finish the transfering and will the next channel in the link be activated to carry over the relay?

Regards,

Philip

over 12 years ago

0 Cvetolin Shulev-XID over 12 years ago

TI__Guru 65405 points

Hi Philip,

I think you are right about: And if I understand properly, if the channel has been processing the event, it will be aborted and the event will be discarded?

But you can read more detailed and accurate description of the DMA request event handling in the omap3530 Technical Reference manual - chapter 9 DMA at the link below:

http://www.ti.com/lit/ug/spruf98x/spruf98x.pdf

Tsvetolin Shulev

0 Tianhua Chu over 12 years ago in reply to Cvetolin Shulev-XID

Intellectual 560 points

Thanks Tsvetolin for your reply.

I read the TRM and don't find the answer for the first part of my post. Do you think that is the way it is?

Thanks,

Philip

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Can OMAP35x DMA event be held when disabling a DMA channel?