2020-10-29 19:40:13 -04:00
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: (spie) DROP ; ( always enabled )
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: (spix) ( x -- x, for port B )
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0 SWAP ( rx tx ) 8 0 DO
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2020-11-02 18:53:57 -05:00
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( send current bit to TRB, TR's output bit )
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DUP 7 I - RSHIFT 1 AND _TRB!
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1 _THB! ( CLK hi )
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0 _THB! ( CLK lo )
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( read into rx ) SWAP 1 LSHIFT _D1@ ( tx rx<< x )
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2020-10-29 19:40:13 -04:00
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( out bit is the 6th ) 6 RSHIFT 1 AND OR
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SWAP LOOP ( rx tx ) DROP ;
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