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fruit-bat / pico-zxspectrum

ZX Spectrum for Raspberry Pico Pi RP2040
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PICOZX TFT #85

Closed digitalmexer closed 11 months ago

digitalmexer commented 1 year ago

I accidentally bought HC28010-D TFT displays. Unlike the HC28010-ISP displays, these display the image inversely. Is it possible to adjust this in the software without much effort? Maybe I am not the only one who wants to use such "inverse displays".

Matthias

fruit-bat commented 1 year ago

'inverse' in what sense? Is this a colour thing or rotation/flip thing?

This what you mean (you need to unzip it).... ZxSpectrumPicomputerZxLcd.uf2.zip

This only inverts the colours on the Spectrum not the menus for now. Let me know if it looks correct and I will sort the menus too.

digitalmexer commented 1 year ago

It works perfectly ! Thank you very much.
Yes, I meant the representation of the colors, I should have been more specific. I think it would be a good idea to enable the color switching in each firmware version. Some programs are more recognizable on the small display in the inverse representation. It also expands the possible uses of the available hardware. Couldn't a config file from the SD card be used for such settings? I'm sure there will be other functions added later

I am very happy about this firmware extension, now I can connect a slightly larger display to Bobricius hardware. It becomes more and more beautiful.

digitalmexer commented 1 year ago

The display in the main menu looks good. Whether black on white or white on black makes no difference. In my opinion, nothing needs to be changed there.

fruit-bat commented 1 year ago

I've tidied up the code and added a new target (ZxSpectrumPicomputerZxInverseLcd.uf2 ) to the 'uf2' folder.

I agree that some way to persist configuration would be nice. Not sure the SD card is the best place. Possibly I could write it to the built in memory on the RP2040. I don't know how to do this at the moment. Will do some reading when I get chance :-)

FYI (and so I remember) it looks like the LCD controller has a command to negate the colours but I couldn't make it work. The final code modifications change the way the RGB colour tables are built for the spectrum and menus.

fruit-bat commented 1 year ago
digitalmexer commented 1 year ago

Thanks again for this useful extension, I have downloaded the new firmware version from Github and tested it. Everything works fine. I think changing the RGB code tables was the only way because the ST7789 with RGB interface does not support inverse display only with i80 interface.
ST7789VW_InterfaceMode

However, I have only read this and have not tried it myself. Below I post some images in inverted and non-inverted color mode. The display also works with a ST7789V chip in SPI mode and has a 3 inch screen.

Exolon_379 Exolon_inv_377

![Exolon_inv_377](https://github.com/fruit-bat/pico-zxspectrum/assets/135758851/09e76c87-7e41-4676-9ce9-fb5f

Start_inv_0378 a8ce

Start_inv_0360 3be3) Dynamite_0369

The photos are not very good. The display foil has an air bubble and there are reflections on the display.

digitalmexer commented 1 year ago

I have other thoughts about extending the software:

  1. is it possible to install the firmware from the SD card of the emulator?
  2. is it possible to make the switch from LCD to VGA without reset. So without having to reload the emulated application program?
fruit-bat commented 1 year ago

I have other thoughts about extending the software:

  1. is it possible to install the firmware from the SD card of the emulator?

Possibly but I really don't know how to do it. I will raise an issue.

  1. is it possible to make the switch from LCD to VGA without reset. So without having to reload the emulated application program?

Possibly, the issue here is shutting down the VGA driver. I 'adapted' a VGA library from another project and I think it needs some careful (and possibly extensive) work to close it down in a tidy fashion. I will raise an issue.