Parallel GPIO examples for IMXRT?

[jackking]

Are there any examples in the MCUXpresso SDK for the IMXRT that implement parallel GPIO?

I would like to use FIFO and eventually DMA with an 8-bit parallel data bus.

[jeremyzhou]

Hi Jack King,

Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
There's no similar demo as you want to refer to.
However, the application AN5313 describes how to use the FlexIO module to
emulate the 8080 parallel bus and to drive a graphical TFT
LCD with the 8080 bus interface.
I think it can guide you to implement parallel GPIO manipulation and please refer to it for details.

Have a great day,
TIC

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[jackking]

That looks like it could be very helpful.  How do I find the associated software for AN5313?  Searching on NXP only returns the PDF document.

[jackking]

Answering myself here...  I had to guess the URL for the AN5313 software, as it doesn't come up on any search.

The URL is: https://www.nxp.com/doc/AN5313SW

[jeremyzhou]

Hi Jack King,

Yes, you got it.

Have a great day,
TIC

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[jackking]

I am still struggling to get parallel FlexIO to work on IMXRT. 

If anyone has an example for IMXRT, or tips, it would be greatly appreciated!

[jeremyzhou]

Hi Jack King,

Thanks for your reply.
How is going on? What's the barrier do you encounter?

Have a great day,
TIC

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[jackking]

I can see the timer output on the flexio pins, but the data from the shifters never shows up on the parallel flexio data pins.

[jeremyzhou]

Hi Jack King,

Thanks for your reply.
Whether you mean that FlexIO doesn't output any wave, as I'm bit confused with your reply.

Have a great day,
TIC

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[jackking]

Yes, that’s what I mean.  I don’t see any output on the FlexIO data pins that is supposed to be generated from the FlexIO shifters.  I do see the clock output from the FlexIO timer, which also uses FlexIO output pins.

Without a working example of FlexIO parallel gpio, it is difficult to identify what may be the cause.

[jeremyzhou · Accepted solution]

Hi Jack King,

I find the demo that demonstrates how to use FlexIO to simulate 8080 interface, please refer to the attachment for details.

Have a great day,
TIC

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[jackking]

Thanks!  That is exactly what I was looking for.

[jackking]

I opened a new thread for converting the SDK mcu lcd example to support IMXRT, it is more relevant than AN5313.

Has anyone converted frdmk28f_flexio_mcu_lcd example to IMXRT?

[jeremyzhou]

Hi Jack King,

Thanks for your reply.
I find that my colleague is handling the question now, so please update the feedback of the post if you have further question.

Have a great day,
TIC

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