You may have noticed that our RP2350 Feather has an FPC output connector on the end for accessing the HSTX (High-Speed Transmission) peripheral. This new capability, not available on the RP2040, is specifically designed to allow the RP2350 chip to drive DVI displays really easily! Historically you could use DVI on the RP2040 by mashing together some overclocking and a lot of PIO - it works but it's quite hacky. The HSTX peripheral is streamlined and doesn't require PIO or overclocking and there's a lot more RAM on the RP2350.
If you want to try out HSTX to drive an HDMI monitor or display, this dongle is what you need to take HSTX out and give you a connector with proper level shifting and signal conditioning. Simply connect a 22 pin FPC cable between the Feather RP2350 and Adafruit RP2350 22-pin FPC HSTX to DVI Adapter for HDMI Displays then load the DVI output code. In CircuitPython, we have support for 320 x 240 pixels at 16-bit colour, which gets pixel doubled to 640 x 480. Or, if you're willing to cut some colourspace to save RAM, you can get true 640 x 480 resolution at 4 / 8-bit colour, or 1 / 2 bit grayscale.
The eight HSTX lines are connected to the differential Clock (IO #14 & 15), Lane0 (#18, 19), Lane1 (#16, #17), and Lane2 (#12, #13) connections. I2C is connected as well so you can read the display EEPROM. Hot-plug-detect is connected to IO #11 on the Feather but can be disconnected by cutting a jumper on the bottom. Ditto for CEC which we connect by default to IO #10.
Each order comes with one DVI adapter board. 22-pin FPC cable and board are NOT included!
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