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avrspi: first steps

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After having done my initial handshaking, I thought the rest of the
job was only a matter of implementing the protocol, but I was wrong.
There were many issues to fix before I could reliably communicate
with my 328P, mostly timing.

Now, I seem to be able to reliably extract fuse information, but
only in batch mode (that is, run "asp$ aspfl@" directly, then
running "(spid)" before running the next command). If I try to
interact with the chip in a single asp$ session, I sometimes get
wrong values (but no sync error! that's worrying...).
This commit is contained in:
Virgil Dupras 2020-08-30 08:01:09 -04:00
parent 7359717000
commit 85f8543e17
3 changed files with 23 additions and 2 deletions
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@ -11,6 +11,6 @@ MASTER INDEX
490 TRS-80 Recipe 520 Fonts
550 TI-84+ Recipe 580 RC2014 Recipe
600-619 unused 620 Sega Master System Recipe
650 AVR assembler 690-729 unused
730 8086 assembler
650 AVR assembler 690 AVR SPI programmer
700-729 unused 730 8086 assembler
800 8086 boot code 830 PC/AT recipe

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AVR SPI programmer
This program allows you to access AVR chips Flash memory, EEPROM
and fuses using a SPI relay. This requires drivers that imple-
ment the SPI Relay protocol.
Load range: B691-BXXX

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: _cmd ( b4 b3 b2 b1 -- r4 )
(spix) DROP DUP (spix) DROP SWAP (spix) = ( b4 f )
SWAP (spix) SWAP ( r4 f ) NOT IF ABORT" AVR err" THEN ;
: asp$ ( -- )
( RESET pulse ) (spie) (spid) (spie)
( wait 20ms ) 2000 0 DO LOOP
( enable prog ) 0 0 0x53 0xac _cmd DROP ;
: asprdy ( -- f ) 0 0 0 0xf0 _cmd NOT ;
: aspfl@ ( -- lfuse ) 0 0 0 0x50 _cmd ;
: aspfh@ ( -- hfuse ) 0 0 0x08 0x58 _cmd ;
: aspfe@ ( -- efuse ) 0 0 0x00 0x58 _cmd ;
: aspfl! ( lfuse -- ) 0 0xa0 0xac _cmd ;
: aspfh! ( hfuse -- ) 0 0xa8 0xac _cmd ;
: aspfe! ( efuse -- ) 0 0xa4 0xac _cmd ;