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Thu Oct 6 16:01:14 EDT 2011
PORTB IOC
A change on RB7-RB4 sets RBIF (= INTCON:0)
To ack we need to read PORTB to end the mismatch condition, and clear
RBIF.
: rbif-ack PORTB @ drop INTCON RBIF low ;
: rbif INTCON @ 1 and ;
: rbif-test rbif-ack rbif ;
Tried this, no success:
\ This doesn't actually wait for a clock pulse, but for a change on
\ *ANY* of RB7-RB4. This is a hack to work around failure to detect
\ short pulses due to interrupts in the busy loop. Doesn't seem to work.
: icsp-sync.hack \ .hack
begin icsp-clock low? until
PORTB @ drop INTCON RBIF low \ ack RBIF
begin INTCON RBIF high? until \ wait for change on RB7-RB4
;
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