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avr: allow writing to flash
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2
blk/690
2
blk/690
@ -4,4 +4,4 @@ This program allows you to access AVR chips Flash memory, EEPROM
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and fuses using a SPI relay. This requires drivers that imple-
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ment the SPI Relay protocol.
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Load range: B691-BXXX
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Load range: B691-B693
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25
blk/691
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blk/691
@ -1,14 +1,15 @@
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: _cmd ( b4 b3 b2 b1 -- r4 )
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(spix) DROP DUP (spix) DROP SWAP (spix) = ( b4 f )
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SWAP (spix) SWAP ( r4 f ) NOT IF ABORT" AVR err" THEN ;
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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$ ( -- )
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( RESET pulse ) (spie) (spid) (spie)
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( wait 20ms ) 2000 0 DO LOOP
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( enable prog ) 0 0 0x53 0xac _cmd DROP ;
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: asprdy ( -- f ) 0 0 0 0xf0 _cmd NOT ;
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: aspfl@ ( -- lfuse ) 0 0 0 0x50 _cmd ;
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: aspfh@ ( -- hfuse ) 0 0 0x08 0x58 _cmd ;
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: aspfe@ ( -- efuse ) 0 0 0x00 0x58 _cmd ;
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: aspfl! ( lfuse -- ) 0 0xa0 0xac _cmd ;
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: aspfh! ( hfuse -- ) 0 0xa8 0xac _cmd ;
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: aspfe! ( efuse -- ) 0 0xa4 0xac _cmd ;
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( wait >20ms ) 5000 0 DO LOOP
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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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7
blk/692
Normal file
7
blk/692
Normal file
@ -0,0 +1,7 @@
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( fuse access. read/write one byte at a time )
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: aspfl@ ( -- lfuse ) 0 0 0 0x50 _cmd ;
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: aspfh@ ( -- hfuse ) 0 0 0x08 0x58 _cmd ;
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: aspfe@ ( -- efuse ) 0 0 0x00 0x58 _cmd ;
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: aspfl! ( lfuse -- ) 0 0xa0 0xac _cmd ;
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: aspfh! ( hfuse -- ) 0 0xa8 0xac _cmd ;
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: aspfe! ( efuse -- ) 0 0xa4 0xac _cmd ;
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13
blk/693
Normal file
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blk/693
Normal file
@ -0,0 +1,13 @@
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: aspfb! ( n a --, write word n to flash buffer addr a )
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SWAP 256 /MOD ( a lo hi ) SWAP ROT ( hi lo a )
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DUP ROT ( hi a a lo ) SWAP ( hi a lo a )
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0 0x40 ( hi a lo a 0 0x40 ) _cmd DROP ( hi a )
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0 0x48 _cmd DROP ;
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: aspfp! ( page --, write buffer to page )
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0 SWAP aspfpgsz @ * 256 /MOD ( 0 lsb msb )
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0x4c _cmd DROP asprdy ;
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: aspf@ ( page a -- n, read word from flash )
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SWAP aspfpgsz @ * OR ( addr ) 256 /MOD ( lsb msb )
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2DUP 0 ROT ROT ( lsb msb 0 lsb msb )
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0x20 _cmd ( lsb msb low )
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ROT ROT 0 ROT ROT ( low 0 lsb msb ) 0x28 _cmd 8 LSHIFT OR ;
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19
doc/avr.txt
19
doc/avr.txt
@ -48,3 +48,22 @@ batch, that is, running your commands right after the "asp$" command, ending
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your batch with "(spid)" so that the next batch works. In my tests, interacting
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with the chip "live" in a single "asp$" session sometimes resulted in unreliable
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data that didn't properly detect sync errors. TODO: investigate further.
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# Writing data to Flash
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Writing to AVR's flash is done in batch mode, page by page. To this end, the
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chip has a buffer which is writable byte-by-byte. To write to the flash, you
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begin by writing to that buffer using aspfb! and then write to a page using
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aspfp!.
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Please note that aspfb! deals with *words*, not bytes. If, for example, you want
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to hook it to A!*, make sure you use AMOVEW instead of AMOVE. You will need to
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create a wrapper word around aspfb! that divides dst addr by 2 because AMOVEW
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use byte-based addresses but aspfb! uses word-based ones. You also have to make
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sure that A@* points to @ (or another word-based fetcher) instead of its default
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value of C@.
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Beware of bootloader sections! By default, AVR chips have a bootloader using the
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first few pages (by default, the ATMega328P uses 4 pages for its bootloader).
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Check (or modify) the BOOTSZ fuses to confirm where you whould start writing
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your program.
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