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almindor / mipidsi

MIPI Display Serial Interface unified driver
MIT License
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Is it still true that the ST7789 only works in SPI? IF so what needs to be done to make it work on 8bit parallel #62

Closed jscatena88 closed 1 year ago

jscatena88 commented 1 year ago

This comment indicates it only works with SPI mode: https://github.com/almindor/mipidsi/blob/321daa0195968de62ca187fb01305e26dac0b454/src/models/st7789.rs#L21

Is that still the case? I was able to construct an instance using a PGPIO8BitInterface, but it is not working properly. I'm not sure if that is expected or not at this point

rfuest commented 1 year ago

The comment is outdated. I know at least one project that is using an ST7789 display with mipidsi on an parallel bus: https://github.com/nw-rs/board-support/blob/master/src/display.rs That project uses a special hardware peripheral inside an STM32 instead of PGPIO8BitInterface, but it should work the same.

Did you not get any display at all or was the display corrupted?

jscatena88 commented 1 year ago

I actually ended up getting it to work. I was just fumbling and forgot ChipSelect is active low not active high. But I can now confirm that the ST7789 works with PGPIO8BitInterface. Specifically I am using the Lilygo T-HMI

rfuest commented 1 year ago

OK, great to hear that it works. And now that you have mentioned the T-HMI I also remembered that I've successfully tried mipidsi on very similar hardware in the past, a T-DISPLAY S3.

jscatena88 commented 1 year ago

I'll go ahead and close this issue but it's probably worth pulling out the comment, especially since it shows up in the docs on docs.rs as well. I almost didn't even give this library a shot because of it