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rogloh wrote: »
I think if you build a dedicated board you can design it right, but for people already using the direct P2-EVAL breakout using Parallax supplied Digital Video Out board without resistors, perhaps this float/1.5k setting is okay, OR if it varies from cable/setup we can try the BITDAC approach.
I felt rather uneasy about having the direct 0V drive down and 3.3V drive up approach I'd been using myself in my driver (so I went and released it with the 1.5k drive coded in for high and low) but perhaps with the 50 ohm termination in the DVI/HDMI receiver it shouldn't ever be a dead short. This float up and 1.5k pull down seems safe(ish?) if it also works for other people. We sort of need people to try it out to see if it works.
Alternatively the BITDAC level version might be a more universal/well constrained solution to be used with the Digital Video Out board.
TonyB_ wrote: »
On the face of things, BITDAC mode using 3.3V & 1.32V (steps 15 & 6) would give ~500mV at the receiver, with no external resistors, if that is safe to try.
wrpin ##%001001<<8, a 'uncomment for full drive output
wrpin ##%111001<<8, a '1.5k pull down, float high
wrpin ##%10110_1111_0110_10_00000_0, a '123 ohm BITDAC for pins