xdma_event_intr for interrupt input

takeshi matsuzaki

Expert 2030 points

Hello,
I want to use xdma_event_intr for interrupt input.

I already know the xdma_event_intr is active high and level sensitive seeing following e2e.
http://e2e.ti.com/support/arm/sitara_arm/f/791/t/309254.aspx
http://e2e.ti.com/support/arm/sitara_arm/f/791/t/297029.aspx

But I want to prevet getting 2 or more times interrupt which happens because xdma_event_intr is level sensitive.

Q1:
How can I prevet getting 2 or more interrups ?
Making the external xdma_event_intr input to be short pulse(not level) works well?

Q2:
I want to get details of xdma_event_intr timing character for interrupt.
Can I get it?

Regards,
Takeshi Matsuzaki

over 11 years ago

0 Biser Gatchev-XID over 11 years ago

TI__Guru**** 393215 points

Hi Matsuzaki-san,

On your first question, I believe that this thread will explain how it works: http://e2e.ti.com/support/arm/sitara_arm/f/791/t/309254.aspx

On your second question, there are no timing diagrams for the xdma_event_intr signals.

0 takeshi matsuzaki over 11 years ago in reply to Biser Gatchev-XID

Expert 2030 points

Hi Biser-san,

Thank you for your quick reply.

Anyway you TI doesn't characterize the xdma_event_intr input timimg for interrupt, we can't use it with guarantee.
You mean if we need timing guarantee, we have to use GPIO interrupt, don't you ?

Regards,
Takeshi Matsuzaki

0 Biser Gatchev-XID over 11 years ago in reply to takeshi matsuzaki

TI__Guru**** 393215 points

Yes, you can do that. Besides GPIO interrupts can be programmed to be edge-sensitive.

0 takeshi matsuzaki over 11 years ago in reply to Biser Gatchev-XID

Expert 2030 points

OK Biser, thanks a lot.

Regards,
Takeshi Matsuzaki

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xdma_event_intr for interrupt input