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Is there some thing I am missing With ShiftOut? — Parallax Forums

Is there some thing I am missing With ShiftOut?

ackericackeric Posts: 7
edited 2008-10-20 18:50 in General Discussion
As Part of a larger project I am using an 8 x 8 RGB Led display(see data sheet below). I thought it was going to be the easy part, But it is driving·me bonkers ( on the up side I am getting plenty of overtime).
It mostly works. My current code gives my most of my characters· although it has a tendency to leave out the last pixel or leaver part of the top line flickering. I would think it was some sort of hardware problem·but if I use simpler code were I store whole bytes for each·led and just read and shift them out it work perfectly. Unfortunately that requires·to much memory.·I have assume that I am doing something stupid. I would appreciate someone pointing what it is out.

Edit:
I am·now sure it is not a hardware problem, and It on seems to effect the first byte my code reads out of the data section.















http://www.sparkfun.com/datasheets/Components/matrix_backpack.pdf

Post Edited (ackeric) : 10/20/2008 5:34:02 PM GMT

Comments

  • ackericackeric Posts: 7
    edited 2008-10-20 18:50
    ·I was Being Stupid . Finish Should = Startp+7 Not Starp+8 . Wow just two nights sleep and it works·
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