Summary

HSTX support for the RP2350!Resolves#17111

This implementation is similar torp2.DMA in that the control registers values are created withpack functions. The FIFO registers are accessed with special functions. It also supports the buffer protocol (write only) so DMA transfers are relatively simple.

Note that this implementation is entirely application agnostic, unlike other HSTX implementations (which often just implement DVI, and end up hogging specific resources for it).

Testing

I've created 2 demoshere. The first is a simple blink, the second is a DVI implementation.

Both tested to work with the following:

• SparkFun IoT RedBoard RP2350
• 22-Pin FPC Cable
• HSTX PTH Breakout
• HSTX to DVI Breakout
• A monitor and cable

Though it should work with any RP2350 board and appropriate hardware to run the DVI example.

Trade-offs and Alternatives

On my machine, this adds 1852 bytes (+0.59%) to theRPI_PICO2 build. IMO this is worth the extra functionality for the reasons outlined in#17111.