[iMXRT1064 ADC-ETC] ADC-ETC latched DMA mode

matanl — Wed, 29 Apr 2026 21:47:22 GMT

Hi,

I'm using iMXRT1064.

According to reference manual there are DMA request types: pulsed and latched.

Latched: "Trig DMA_REQ with latched signal, REQ will be cleared when ACK and source request
cleared."

Pulsed: "Trig DMA_REQ with pulsed signal, REQ will be cleared by ACK only."

I'm trying to understand in latched mode what "source request cleared" refers to.

What is exactly this "source request"?

How user can clear it?

At first I thought this refers to DMA_CTRL TRIGx_REQ bits, however clearing those does not lead to stable behavior - DMA keeps handling requests when it shouldn't.

I'd appreciate any hint.

topic [iMXRT1064 ADC-ETC] ADC-ETC latched DMA mode in i.MX RT Crossover MCUs

[iMXRT1064 ADC-ETC] ADC-ETC latched DMA mode