With some clever hacks and fast IO work, it’s possible to get your average garden-variety microcontroller to output some form of video. Old analog standards like composite and VGA are just slow enough that it’s possible to bitbash one’s way to success. If you’re serious about video work, however, you’ll want something more capable. For those use cases, [purisame]’s got what you need – an open source HDMI implementation for FPGAs.

Unlike other free and open source projects in this space, [purisame] has eschewed simply outputting compatible DVI signals on the port. This implementation is pure HDMI 1.4b, enabling the extended capabilities this brings, like combined video and audio streams. Thus far, it’s been tested on Xilinx and Altera platforms, though it may be compatible with Lattice, too.

In addition to the code, [purisame] breaks down options for those looking at going into production with an HDMI device. Licencing the technology for sale can be a fraught area, so a lawyer is recommended if you’re heading to market. Oh, and funnily enough, if your really do want to do HDMI on an Arduino, there’s a shield for that, too. Natch!