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avrpgm: add EEPROM support

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also, verify all 3 first bytes of SPI commands. I'm not sure why
I wasn't doing that, probably because I was getting a lot of AVR
err and thought that only 2 bytes of the cmd were echoed. But now,
with a reliable SPI setup, verifying 3 bytes seems to work.
This commit is contained in:
Virgil Dupras 2020-10-05 19:32:42 -04:00
parent 8630b0a8ed
commit eafcb0c440
4 changed files with 17 additions and 4 deletions
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4
blk/160
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@ -1,4 +1,4 @@
( AVR Programmer, load range 160-162. doc/avr.txt )
( AVR Programmer, load range 160-163. doc/avr.txt )
( page size in words, 64 is default on atmega328P )
CREATE aspfpgsz 64 ,
VARIABLE aspprevx
@ -6,7 +6,7 @@ VARIABLE aspprevx
: _xc ( a -- b ) DUP (spix) ( a b )
DUP aspprevx @ = NOT IF ABORT" AVR err" THEN ( a b )
SWAP aspprevx ! ( b ) ;
: _cmd ( b4 b3 b2 b1 -- r4 ) _xc DROP _x DROP _xc DROP _x ;
: _cmd ( b4 b3 b2 b1 -- r4 ) _xc DROP _xc DROP _xc DROP _x ;
: asprdy ( -- ) BEGIN 0 0 0 0xf0 _cmd 1 AND NOT UNTIL ;
: asp$ ( spidevid -- )
( RESET pulse ) DUP (spie) 0 (spie) (spie)

6
blk/163 Normal file
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@ -0,0 +1,6 @@
: aspe@ ( addr -- byte, read from EEPROM )
0 SWAP 256 /MOD ( 0 lsb msb ) SWAP
0xa0 ( 0 msb lsb 0xa0 ) _cmd ;
: aspe! ( byte addr --, write to EEPROM )
256 /MOD ( b lsb msb ) SWAP
0xc0 ( b msb lsb 0xc0 ) _cmd DROP asprdy ;

7
doc/avr.txt
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@ -103,3 +103,10 @@ aspfb! that divides dst addr by 2 because AMOVEW use byte-based
addresses but aspfb! uses word-based ones. You also have to make
sure that A@* points to @ (or another word-based fetcher)
instead of its default value of C@.
# Access EEPROM
Accessing EEPROM is simple and is done byte-by-byte with words
aspe@ and aspe!. Example:
0x42 0 aspe! 0 aspe@ .x ( prints 42 )

4
recipes/rc2014/avr.md
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@ -27,8 +27,8 @@ the "no division" position, and when I communicate with the
AVR chip, I move the switch to increase the divisor.
Once you've done this, you can test that you can communicate
with your AVR chip by doing `160 162 LOADR` (turn off your
programmer or alse it might mess up the SPI bus and prevent you
with your AVR chip by doing `160 163 LOADR` (turn off your
programmer or else it might mess up the SPI bus and prevent you
from using your SD card) and then running:
1 asp$ aspfl@ .x 0 (spie)