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Adding a delay such as the 20ms one we have in AVR programmer's initialization routine is tricky without a word like TICKS. This implementation is highly inaccurate, but more accurate and reliable than a "ballpark" DO..LOOP...
17 lines
635 B
Plaintext
17 lines
635 B
Plaintext
( AVR Programmer, load range 160-162. doc/avr.txt )
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( page size in words, 64 is default on atmega328P )
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CREATE aspfpgsz 64 ,
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VARIABLE aspprevx
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: _x ( a -- b ) DUP aspprevx ! (spix) ;
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: _xc ( a -- b ) DUP (spix) ( a b )
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DUP aspprevx @ = NOT IF ABORT" AVR err" THEN ( a b )
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SWAP aspprevx ! ( b ) ;
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: _cmd ( b4 b3 b2 b1 -- r4 ) _xc DROP _x DROP _xc DROP _x ;
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: asprdy ( -- ) BEGIN 0 0 0 0xf0 _cmd 1 AND NOT UNTIL ;
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: asp$ ( spidevid -- )
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( RESET pulse ) DUP (spie) 0 (spie) (spie)
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( wait >20ms ) 220 TICKS
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( enable prog ) 0xac (spix) DROP
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0x53 _x DROP 0 _xc DROP 0 _x DROP ;
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: asperase 0 0 0x80 0xac _cmd asprdy ;
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