Add CYD Variants list

[Adam]

I'd like to request a place to list the variants of CYD. I recognize that this is built around the micro-USB-only variant, but the USB-C variant is common too, and I can get it shipped for $9.50. Works perfectly with CYD-Klipper as long as I invert the colors (a fortunate feature) and I can imagine lots of people buying that variant without knowing better as I did. Galago works on it too.
There are other variants too, and I think with some basic documentation, we could take advantage of a lot of these with minimal or no changes.

As a start, the USB-C version has a slightly worse screen (more gray blacks) but comes cheaper. It's screen is inverted according to the CYD-Klipper developer, but otherwise it's the same.

There's also at least one larger version of the screen, but I've only heard of a few people trying it. One has higher resolution.

[Brian Lough]

The USB C version is supported as a cyd per these instructions

https://github.com/witnessmenow/ESP32-Cheap-Yellow-Display/blob/main/cyd.md

All other of these yellow displays are not considered CYDs, but I have already added a place to add info about them here

https://github.com/witnessmenow/ESP32-Cheap-Yellow-Display/tree/main/Variants

[william-orange]

Does anyone have a schematic for the CYD2USB board?

A couple of notes. The gamma correction mentioned in the link above makes an enormous difference. My board programs fine through a cable like this USB 10Gbps Cable A Male to C Male 3.00'

[Aljaz Ogrin]

I agree, schematic or pinout would be very welcome.
Also I wasn't able to find a table that lists LCD driver chip types for every variant.

[Aljaz Ogrin]

One staring point for the board info is attached. Translated from Japanese.
ESP32-2432S028_macsbug.pdf

[Papa Lanc]

The gamma correction mentioned in the link above makes an enormous difference.

Where did you insert that code in .ino?

[Papa Lanc]

I got it to build on the cyd2 but the colors are still off. I swear it used to work fine

  digitalWrite(16, HIGH);
  digitalWrite(17, HIGH);

  // Start the tft display and set it to black
  tft.init();
  tft.setRotation(1); //This is the display in landscape

  // Define the ILI9341_GAMMASET if it is not included in your library
#define ILI9341_GAMMASET 0x26  // Gamma curve command for ILI9341


    // Insert the gamma curve setup here
  tft.writecommand(ILI9341_GAMMASET); // Gamma curve selected
  tft.writedata(2);
  delay(120);
  tft.writecommand(ILI9341_GAMMASET); // Gamma curve selected
  tft.writedata(1);
  
  // Clear the screen before writing to it
  tft.fillScreen(TFT_BLACK);
  tft.setTextColor(TFT_WHITE, TFT_BLACK);
  tft.setTextSize(2);
  tft.setSwapBytes(true);

  ts.begin();

[william-orange]

In setup() {

// lots of stuff and toward the end
if (CYD2USB) gammaCorrection(); // improves color on CYD2USB
}
Here's the function:

/---------------------------------------------- Gamma correction --------------------------------------------------------------/

void gammaCorrection() {
tft.writecommand(ILI9341_GAMMASET); //Gamma curve selected
tft.writedata(2);
delay(120);
tft.writecommand(ILI9341_GAMMASET); //Gamma curve selected
tft.writedata(1);
}

So, your code looks fine.

Bill

[Papa Lanc]

Thanks, I finally got it working even though it is usbc but I had to change some other stuff. it seems to work with the 9341-2 driver

so I added a section to platformio.ini

[env:cyd]
build_flags =
	${env.build_flags}
	-DILI9341_2_DRIVER
	

[env:cyd2usb]
build_flags =
	${env.build_flags}
	-DST7789_DRIVER
	-DTFT_INVERSION_OFF

[env:cyd2b]
build_flags =
	${env.build_flags}
	-DILI9341_2_DRIVER
	-DTFT_INVERSION_ON
	-DENV_CYD2B
	-DUSE_GAMMA_CORRECTION

then in .ino

  // Start the tft display and set it to black
  tft.init();
  tft.setRotation(1); //This is the display in landscape

 // Define the ILI9341_GAMMASET if it is not included in your library
#define ILI9341_GAMMASET 0x26  // Gamma curve command for ILI9341
#ifdef ENV_CYD2B
  // Code specific to cyd2b
    // gamma curve setup 
  tft.writecommand(ILI9341_GAMMASET); // Gamma curve selected
  tft.writedata(2);
  delay(120);
  tft.writecommand(ILI9341_GAMMASET); // Gamma curve selected
  tft.writedata(1);  
#endif


  // Clear the screen before writing to it
  tft.fillScreen(TFT_BLACK);