Signal ATRIG of eQADC is barely documented. Where to find the signal routing?

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Signal ATRIG of eQADC is barely documented. Where to find the signal routing?

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peter_vranken
Contributor III

Dear NXP Team,

I'm currently making an I/O driver for the eQADC of the MPC5775B/E and I
want to make use of the streaming mode with CFIFO0. The documentation
(Reference Manual MPC5775E, Rev. 1, 05/2018, section 29) explains the need
of an Advance Trigger to start the streaming loop controlled by the normal
trigger (ETRIG). The entire section doesn't tell anything about where the
two trigger signals come from.

Ibid, sections 8.2.18f, SIU_ISEL4/5, describe multiplexers for choosing a
trigger signal for the command FIFOs but it looks much as if this relates
only to the normal trigger input ETRIG.

The entire reference manual (including Excel I/O attachment) has no
matches for "atrig" or "atrig0" outside of section 29, so I'm stuck.

Where do I find the information how to select an appropriate ATRIG signal?

How can I otherwise start the streaming mode?

The eQADC samples I found at
https://community.nxp.com/t5/MPC5xxx-Knowledge-Base/MPC5-software-example-list/ta-p/1102445#MPC5777C
seem to all use the simple software trigger only. Is there a sample for
the streaming mode, too?

Kind regards,
Peter

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1 Solution
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peter_vranken
Contributor III

Thanks a lot, got it. Driver is running well meanwhile

Peter

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peter_vranken
Contributor III

Thanks a lot, got it. Driver is running well meanwhile

Peter

View solution in original post

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davidtosenovjan
NXP TechSupport
NXP TechSupport

SIU_ISEL4-7 chooses normal trigger (ETRIG) but this is also repeat trigger in streaming mode.

SIU_ISEL9 selects Advance Trigger Source - this is basically ATRIG signal. As external signal ATRIG is not present with this device.

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