i.MX ProcessorsのトピックImmediately stop of eLCDIF data transfer.

Immediately stop of eLCDIF data transfer.

ko-hey — Tue, 24 Jan 2017 09:52:27 GMT

Hi all

I'm reading IMX7DRM Rev. 0.1, 08/2016 and have question about eLCDIF in MPU interface.

Q1.

I want to transfer data and commands between the SoC via the eLCDIF in MPU interface as fast as possible.
I think the only way is to use higher DISPLAY_CLK.
Does someone have any idea ?

I want to immediately stop the transfer data.
I speculated that it'll stop when user set SFTRST field of LCDIFx_RLn register.
Am I correct ?
Also do you have any concern for that use case ?

Q2-1

If user can stop the data transfer with setting "1" to SFTRST, what happens to the output ports such as LCD command and data ?
Does the port keep Pull-up, Pull-down or Hi-Z ?

Q2-2

If Q2 is no, do you have any idea to stop the transfer data immediately ?

Ko-hey

Re: Immediately stop of eLCDIF data transfer.

igorpadykov — Tue, 24 Jan 2017 23:23:08 GMT

Hi Ko-hey

according to sect.13.2.4.6 MPU Interface i.MX7D RM

http://cache.nxp.com/files/32bit/doc/ref_manual/IMX7DRM.pdf

"The current transfer can be cancelled/aborted if the RUN bit is manually made 0."

Seems this could be done also with SFTRST, output ports become idle as in Figure 13-13,

pad settings (Pull-up, Pull-down or Hi-Z) stay unchanged.

Best regards
igor
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Re: Immediately stop of eLCDIF data transfer.

ko-hey — Thu, 26 Jan 2017 00:35:11 GMT

Igor

Thank you for reply.

I understand that user should set RUN field to "0” manually if user want to cancel/abort the transfer and the output ports are no change after the transfer cancelled.

How about Q1 ?

Do you have any idea for it ?

Ko-hey

Re: Immediately stop of eLCDIF data transfer.

igorpadykov — Thu, 26 Jan 2017 01:00:53 GMT

Hi Ko-hey

for Q1 I think your idea is right.

Best regards
igor

Re: Immediately stop of eLCDIF data transfer.

ko-hey — Thu, 26 Jan 2017 01:43:33 GMT

Hi Igor

Thank you.

Ko-hey