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Peter Cock 2025-12-05 10:07:22 +00:00 committed by GitHub
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@ -16,8 +16,8 @@ This is a *diode-free* design with a sparse 13 by 13 scanning matrix designed us
for background.
This matrix shows the 13×13 PG(2,3) bipartite scanning matrix in Paige-Wexler
normal form. The keys are assign so the scanning column order roughly matches
the physical columns (starting with Escape, A, Z, tab as the first column), with
normal form. The keys are assigned so the scanning column order roughly matches
the physical columns (starting with Escape, Q, A, Z, as the first column), with
the scanning rows sorted to ensure Escape is top left as the first matrix entry.
The allocation of keys to matrix elements and scanning matrix rows and columns
to GPIO pins was arbitrary and down to how easy it was to layout the PCB traces: