TM4C123AH6PM: Datasheet clarification on uDMA and NVIC

twelve12pm

Part Number: TM4C123AH6PM

Datasheet section 8.2.8 (page 545) states: "When using μDMA to transfer data to and from a peripheral, the peripheral must disable all interrupts to the NVIC."

Two questions:

1) Does that happen automatically or is this something that software must tell the peripheral to do?

2) If an interrupt would occur during the DMA transfer, what happens to it? Is it lost? Is it delayed until completion of the DMA transfer?

Thanks

over 4 years ago

0 Ralph Jacobi over 4 years ago

TI__Guru*** 128155 points

Hello twelve12pm,

So... that's a great question upon which looking up how to answer, I stumbled across this...

...If it helps any, I've stumbled across many of my own posts and sat there for a moment wondering 'wait I knew all that two years ago? Huh...' :)

0 cb1_mobile over 4 years ago in reply to Ralph Jacobi

Guru 117850 points

Ralph Jacobi said:
...If it helps any, I've stumbled across many of my own posts and sat there for a moment wondering 'wait I knew all that two years ago? Huh...' :)

That's a GREAT Quote - and likely many others & (especially) myself - have found ourselves in that (same) boat! Dreaded 'short-term learning' (cram for finals) lives. Might this poster - in this instance - have been, 'Hoisted with his own petard?'

0 twelve12pm over 4 years ago in reply to Ralph Jacobi

Genius 4455 points

It seems I asked exactly the same question twice... Deja vu.

"A deja vu is a glitch in the Matrix. It happens when they change something."

Thanks for your help!

Arm-based microcontrollers

Arm-based microcontrollers forum

TM4C123AH6PM: Datasheet clarification on uDMA and NVIC