collapseos/blk/424

( -- n )
: _idle 0xff (spix) ;

( -- n )
( spix 0xff until the response is something else than 0xff
  for a maximum of 20 times. Returns 0xff if no response. )
: _wait
    0 ( dummy ) 20 0 DO
        DROP _idle DUP 0xff = NOT IF LEAVE THEN
    LOOP ;