collapseos/drv/at28.fs

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2020-04-12 21:49:42 -04:00
( With dst being assumed to be an AT28 EEPROM, perform !
operation while doing the right thing. Checks data integrity
and ABORT on mismatch.
)
( a n -- )
: AT28!
2DUP C! SWAP
( as long as writing operation is running, IO/6 will toggle at each
read attempt. We know that write is finished when we read the same
value twice. )
BEGIN ( n1 a )
DUP C@ ( n1 a n2 )
OVER C@ ( n1 a n2 n3 )
= UNTIL
( We're finished writing. do we have a mismatch? )
C@ = NOT IF ABORT" mismatch" THEN
;