HDMI is awful, DisplayPort requires you to join VESA, MIPI for CSI and DSI devices, etc. Actually their patents expired so maybe you can do native SD mode now without much fear. Want to support SD cards? Pay a bunch to SDA. What hurts is how patent/royalty/industry interest group encumbered that nearly everything modern is. Managed to get a few Lattice iCE40HX8K's in the CT256 package (256 balls 0.8mm pitch BGA). Next thing I want to try is breaking out a small BGA. 0402 are the smallest thing I can do by hand. Had to learn how to do soldering using a stencil, paste, hot air station, and a hotplate because no one is hand soldering 0.4mm QFN packages. Probably my crowning achievement at this point is making an 1.8V LVDS to TMDS level shifter board so I can get HDMI 1.2a (4x 1.65 Gbps lanes + sidebands) out of an FPGA board I repurposed from some cryptomining hardware I bought on eBay. Used a tool to compute minimum trace spacing to stay under a certain capacitance for a specific copper weight, board thickness, dielectric type, etc. I've made some retrocomputing boards ( 4 layer boards can be had for very cheap these days (JLCPCB does 10 for $30 w/ ENIG boards up to 10cm x 10cm), so I followed the "just do yourself a favor and get the 4 layers boards so you can make ground and power planes" advice. My electrical knowledge is an introductory electromagnetics course I had to take in college that I've mostly forgotten, reading/watching EEVblog, other internet sources, playing around with cheap and/or old parts, reading whatever I can find, etc.
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