Other color displays?

orntar · December 19, 2025, 5:16pm

I have worked with the color displays so I know proffie os supports 4 different ones right now.

I assume this is a technical reason. Is it possible to support other displays?

I found this little guy and think it would be good for some projects like blaster scopes.
https://www.aliexpress.us/item/3256805407977104.html

profezzorn · December 19, 2025, 8:05pm

It is definitely possible to support other displays, but it may take some work, depending on protocols, chips, etc. The four supported ones are simply the ones that I have tested.

This display uses a different family of chips from the other color screens we support, so it may require more work than other screens, but I’m fairly certain it is possible. It’s just a matter of reading the data sheet and/or the Adafruit code for this display and then add the required commands to the ProffieOS code.

Displays that use the same chips that we already support are easier; it’s just a matter of putting together the right display definition, which is fairly easy. (And about 10 lines of code.)

orntar · December 22, 2025, 3:44pm

gotcha. So something with the ST7735 (or ST7789 according to adafruit) would be easier?

Something like this?:
https://www.aliexpress.us/item/3256809897412406.html

profezzorn · December 23, 2025, 7:19am

Yep, that one will most likely be pretty easy to get to work.
Just copy this: (714-728)

github.com

profezzorn/ProffieOS/blob/8fdfb059d33b931cb57b655c5a4bcce8ab9cc173/display/spidisplay.h#L714


      
              tmp[1] = a & 0xff;
              a += this->HEIGHT - 1;
              tmp[2] = a >> 8;
              tmp[3] = a & 0xff;
              
              this->sendCommand(ST77XXCommands::ST77XX_RASET, tmp, 4);
              this->sendCommand(ST77XXCommands::ST77XX_RAMWR, tmp, 0);
            }
          };
          
          template<int LAYERS,
          	 class CONFIG = DisplayConfig<1>,
          	 class SA = StandardDisplayAdapter<>>
          using SPIDisplay_AdaFruit358 = SPIDisplay77XX<
            LAYERS,
            CONFIG,
            // HELPER
            DisplayConfigHelper<LAYERS, CONFIG, SizeT<128, 160>, SA, ST7735>,
            // InitSequence
            ConcatByteArrays<ST7735::RCMD, typename CONFIG::template rotation_cmd<ST7735> >,
            // OnSequence

change the size, then see if it works.
It may need rotation, shifting and/or color order adjustments, but those should be fairly easy to figure out.

orntar · January 8, 2026, 2:35pm

I am getting ready to try this out (as well as 2 other displays) and I have a question about connecting the pins…

In the configurator and here: Color display progress - #18 by profezzorn

the listed the pin connections for the eyespi are:

EYESPI	PBV3	function
TCS	GND	Chip Select
RST	no connect	Reset
DC	Free3	Command Select
MISO	no connect
MOSI	Data3	Data
SCK	Free1	Clock
Gnd	GND	power
Lite	Free2	Backlight control
Vin	SD_VDD	power

However on these displays I have SDA and SCL instead:

Display	Function (I think)
GND	Ground
VCC	Power In
SCL	???
SDA	???
RST	Reset
DC	Command
CS	Chip Select
BL	Backlight Control

From my limited understanding, this may be the I2C protocol instead? Can these be used with the color display settings? If so, what proffie pins connect to SDA and SCL?

profezzorn · January 8, 2026, 11:33pm

for an I2C display, you would wire it the same as an OLED display.
However, the current code is not set up for that, so it would need additional code to work.
Also, I2C maxes out at 400kBit/s, which would be very slow for a color display unless it has very few bits. SPI displays generally operate at 10x or even 100x that speed.

It is possible that SDA really means “Data” and SCL really means SCK though.