I ported over a bit-banged version of configuration code for the SSD2828 and added it to my fork of the Ra8876LiteTeensy library. You can see the files here:
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+1 for PlatformIO and VSCode. The combination is remarkably easy use, though it does have a slightly steeper learning curve than the Arduino IDE.
What the PlatformIO team has accomplished is amazing. A HUGE set of...
You'll definitely need those resistors (I2C pull-ups, RESET, REXT), so see if you can get them soldered in somehow.
And looking at the schematic, it seems you are using 5v+ for some of the devices, including the...
A couple of things to look at:
According the datasheet, you'll need a pull-up resistor on the /RESET pin. Make sure you have that connected before you power it up.
And you'll need REXT connected to a resistor to...
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