@bko , As far as I know, yes, it was ported… @ScruffR ported the adafruit library back in Nov '14, on this thread:
And they included pictures of it working. I took great pains to study those pictures to be sure about the connections I’m using, and as far as I know they match the hardware SPI connections on the Core.
I’ve dug around in the library a bit, but I’m still kind of a newb at all of this even after three years. One thing I did was fork the ILI9341 library (Which works perfectly for me on my other display) and change its size definitions to match the HX8357. That works… very, very, very badly. Lots of noise, and very unpredictable. Not only that, using the mod I made seemed to make the Core less stable, so I stopped using it and did a factory reset. Instead I re-focused my efforts on getting this library to work - I mean, teeming dozens of core users implement this library, why can’t I?
Anyway, I don’t think I’m at the point where I can port a library myself. Just fiddling with one was pretty intimidating. I have to use a bigger display though, so if it comes to it I’ll try… just really wanna avoid all that work if there’s any way.