TCA8418: How can i get nINT when a GPI released event added to FIFO?

volatile

Part Number: TCA8418

Hello,

I used GPI only and enabled GPIO_INT_ENx and GPI_EMx.

When nINT falling, I read KEY_EVENT_A(0x04) until get 0. Then I noticed that falling edge on GPI will add a corresponding event to FIFO with triggering nINT, but any raising edge will add to FIFO without triggering nINT.

So, how can I get the release event immediately?

over 5 years ago

0 Miguel Robertson over 5 years ago

TI__Guru 62920 points

Hello,

We will get back to you on this once we are back in the office tomorrow.

Max

0 BOBBY over 5 years ago

TI__Guru* 75011 points

Hey volatile,

Can you write '1' into register 0x26h-0x28h? This should cause the INT to trigger on a low to high state from the GPI.

-Bobby

0 volatile over 5 years ago in reply to BOBBY

Prodigy 35 points

Hi Bobby,

Yes, I know these registers. Since I write 1 into them, a rising edge will trigger INT and falling edges won't. But I need the both edge.

0 BOBBY over 5 years ago in reply to volatile

TI__Guru* 75011 points

Hey volatile,

Sorry for the delay in getting back to you.

I currently do not have a TCA8418 on hand but I believe you should be able to detect when the GPI changes state and keep the INT flagged.

"I used GPI only and enabled GPIO_INT_ENx and GPI_EMx."

Did you configure register 0x01h bit 1 to be set to '1' as well?

Thanks,

-Bobby

0 volatile over 5 years ago in reply to BOBBY

Prodigy 35 points

Hey Bobby,

Thank you very much! I set CFG_GPI_IEN bit but didn't set CFG_KE_IEN bit, so only push but not release can trigger INT.

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TCA8418: How can i get nINT when a GPI released event added to FIFO?