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Question about VID circuit, I/O pins and such — Parallax Forums

Question about VID circuit, I/O pins and such

pedwardpedward Posts: 1,642
edited 2013-04-16 13:26 in Propeller 2
I wonder if it's possible to drive the same video pins from different cogs at the same time? One cog could run lockstep to another, but one cog would be outputting a text buffer and the other outputting a bitmap, causing an overlay. The P1 had OR circuits, does the P2 have similar such logic on the I/O pins? If one cog outputs a blank, that could be used as a mask for the other COG to fill in. So the text renderer would use blank/black cells to designate the background. This would allow you to overlay text on a graphical background without needing to BLIT it and keep backing store.

Comments

  • potatoheadpotatohead Posts: 10,261
    edited 2013-04-16 12:43
    I wonder that too and my reason was to do a hybrid component driver with color info at a different bit rate than Luna. The emulations only support cog 0, so I was basically waiting on it.
  • cgraceycgracey Posts: 14,151
    edited 2013-04-16 13:03
    It's possible, but we need the actual silicon.

    You would use CFGPINS to reassign the pin DACs to different cogs, on the fly.
  • pedwardpedward Posts: 1,642
    edited 2013-04-16 13:26
    I just happen to have 1, maybe 2 clocks free! :smile:
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