FlexIO emulating an Intel 8080 bus

MKlem · ‎09-02-2022

Hi!

I'm trying to drive a display using the MIMXRT1010-EVK (containing the MIMXRT1011DAE5A) with an intel 8080 bus.

I'm using the FlexIO and the fsl_flexio_mculcd.c driver. I've setup the driver and I'm (finally) getting something out!

Except, while writing, the RD pin should be driven high and likewise, while reading, the WR pin should be driven high. I can't keep these pins high. A measurement can be seen in this picture:

The RD pin (red) is low when the WR pin is clocking data, and the WR pin is also low when the RD is clocking data.

This results in the LCD not responding to anything.

Is there something I can do about this? In AN5313 and AN12822 I found it can be done.

What am I missing here?

Thanks!

Marcel

Omar_Anguiano · ‎09-08-2022

Hello

Hope you are well.
I suggest you refer to the example referred in AN12822. It is possible that the pin configuration is causing this behavior so I suggest you use the example parameters in your application.

If you have more questions do not hesitate to ask me.
Best regards,
Omar