Esp32S3 LCD_CAM support?

[yanshay]

Is there a way to use the LCD_CAM (I need the LCD part) working with esp-hal?
It's pretty much required to get a reasonable fps rate on displays with the ESP32 on many boards using I8080 based mid-high resolution. With standard techniques I was able to get at most 10fps of just solid color screen w/o any graphics rendering involved.
I couldn't find it supported in esp-hal (is it in plan?) so maybe someone implemented it somewhere directly with esp-pacs?
Or maybe there's some other way to get it to work w/o going to esp-idf-hal where I think I saw it's supported?
I tried following the esp-idf c code, but setting everything up seems pretty complex.

[jessebraham]

There is currently no driver for this peripheral, one will need to be written. All the required registers should be available in the PAC already.

[Dominaezzz]

Are you looking for I8080 or DPI?

If it's the former I'm preparing to contribute a driver for it as I have it working in a project of mine using esp-pacs (but running on esp-idf).

The only awkward bit about the peripheral is that it supports simultaneous use of both the LCD and CAMera features and I'm not sure how esp-hal normally handles this sort of thing. One should be able to create two drivers from the same peripheral somehow whilst keeping the borrow checker happy.

[yanshay]

I'm looking for using the LCD with I8080.
I need it for esp-hal, but if you could share what you've made for esp-idf that would be great, I'll try to adapt it to esp-hal.

[bjoernQ]

Usually, in similar situations we have one driver which provides a "tx" and "rx" half - e.g. https://docs.rs/esp32s3-hal/0.14.0/esp32s3_hal/i2s/struct.I2s.html#method.new

Sometimes we also provide convenience constructors to only create the "tx" or "rx" half (taking ownership which means the other cannot get constructed later)

[Dominaezzz]

The I2s with the two halves makes sense to me. I'll PR something for the LCD half in I8080 mode.

[Dominaezzz]

Made a POC to start. #1086

Can iterate on the design/impl. @yanshay you should be able to use this now.

[yanshay]

Thanks! Looks good.
I'll try to get it working and switch to discuss in the PR.
Just a real quick note from just 1 min initial test - I am also using WT32-SC01-Plus so ran yor example and I don't see anything on the screen (I do see the logs of Set Address and Drawing).
I just checked out your branch and did cargo run --example lcd_i8080 from the esp32s3-hal/examples.
Maybe something wrong on my end, will check it out, just wanted to update in case something is wrong there.

[yanshay]

My mistake, well, maybe not a mistake, just didn't see the pixels since they are just at the top of the screen.
So the example does seem to be working.

[Dominaezzz]

Ha, now that's convenient, especially since I've hard coded all the config for exactly that dev board haha.

Glad it's working for you too. I'll make the example more interesting before I merge the PR.

[Dominaezzz]

Can this be marked as the answer? 😄