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Recursive scan-columns.

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This commit is contained in:
Phil Hagelberg 2014-12-08 22:24:55 -08:00
parent 7a374636bb
commit 20df8134c1
1 changed files with 14 additions and 11 deletions
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23
menelaus.scm
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@ -2,18 +2,21 @@
(include "keycodes.scm")
(define columns (list 0 1 2 3 4 5 6 7 8 9))
(define column-pins (vector 11 12 18 19 10 7 8 9 5 6))
(define layout (vector key-a key-s key-d key-f key-g
(define column-pins (list 11 12 18 19 10 7 8 9 5 6))
(define layout (list key-a key-s key-d key-f key-g
key-h key-j key-k key-l key-semicolon))
(define (scan-column last n)
(if (low? (vector-ref column-pins n))
(vector-ref layout n)
last))
(define (scan-column column-pins layout pressed)
(if (null? column-pins)
pressed
(scan-column (cdr column-pins)
(cdr layout)
(if (low? (car column-pins))
(car layout)
pressed))))
(define (loop)
(let ((pressed (fold scan-column 0 columns)))
(let ((pressed (scan-row column-pins layout 0)))
(call-c-func "usb_send" 0 pressed 0 0 0 0 0))
(loop))
@ -26,8 +29,8 @@
8 2 4 32 65 128))
(output 1)
(low 1)
(for-each-vector input column-pins)
(for-each-vector high column-pins) ; activate pullup resistors
(for-each input column-pins)
(for-each high column-pins) ; activate pullup resistors
(call-c-func "usb_init")
(pause 200))