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Add ~C!ERR

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A ~C! override can, if it wants, go put an error code in there,
which ~AT28 does.

This way, after a copy or xcomp process directly to EEPROM, one
can verify whether all bytes were successfully written by checking
whether "~C!ERR C@" is zero.
This commit is contained in:
Virgil Dupras 2020-12-09 19:44:02 -05:00
parent dda80801d5
commit cbd9f035ae
3 changed files with 20 additions and 10 deletions
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17
blk.fs
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@ -1078,6 +1078,7 @@ HERESTART [IF]
[THEN] [THEN]
SYSVARS 0x04 + LD(i)HL, ( RAM+04 == HERE ) SYSVARS 0x04 + LD(i)HL, ( RAM+04 == HERE )
A XORr, SYSVARS 0x3e + LD(i)A, ( 3e == ~C! ) A XORr, SYSVARS 0x3e + LD(i)A, ( 3e == ~C! )
SYSVARS 0x41 + LD(i)A, ( 41 == ~C!ERR )
DE BIN( @ 0x04 ( BOOT ) + LDd(i), DE BIN( @ 0x04 ( BOOT ) + LDd(i),
JR, L1 FWR ( execute, B287 ) JR, L1 FWR ( execute, B287 )
( ----- 286 ) ( ----- 286 )
@ -1689,7 +1690,7 @@ driver code. Load the low part with "353 LOAD", the high part
with "390 LOAD" with "390 LOAD"
( ----- 353 ) ( ----- 353 )
: RAM+ [ SYSVARS LITN ] + ; : BIN+ [ BIN( @ LITN ] + ; : RAM+ [ SYSVARS LITN ] + ; : BIN+ [ BIN( @ LITN ] + ;
: HERE 0x04 RAM+ ; : HERE 0x04 RAM+ ; : ~C!ERR 0x41 RAM+ ;
: CURRENT* 0x51 RAM+ ; : CURRENT CURRENT* @ ; : CURRENT* 0x51 RAM+ ; : CURRENT CURRENT* @ ;
: H@ HERE @ ; : H@ HERE @ ;
: FIND ( w -- a f ) CURRENT @ SWAP _find ; : FIND ( w -- a f ) CURRENT @ SWAP _find ;
@ -2159,14 +2160,18 @@ XCURRENT @ _xapply ORG @ 0x04 ( stable ABI BOOT ) + !
':' X' _ 4 - C! ( give : its name ) ':' X' _ 4 - C! ( give : its name )
'(' X' _ 4 - C! '(' X' _ 4 - C!
( ----- 400 ) ( ----- 400 )
( Write byte E at addr HL, assumed to be an AT28 EEPROM. ( Write byte E at addr HL, assumed to be an AT28 EEPROM. After
After that, poll repeatedly that address until writing is that, poll repeatedly that address until writing is complete.
complete. ) If last polled value is different than orig, set ~C!ERR )
(entry) ~AT28 ( warning: don't touch D register ) (entry) ~AT28 ( warning: don't touch D register )
(HL) E LDrr, E (HL) LDrr, ( poll ) BEGIN, (HL) E LDrr, A E LDrr, ( orig ) EXAFAF', ( save )
E (HL) LDrr, ( poll ) BEGIN,
A (HL) LDrr, ( poll ) E CPr, ( same as old? ) A (HL) LDrr, ( poll ) E CPr, ( same as old? )
E A LDrr, ( save old poll, Z preserved ) E A LDrr, ( save old poll, Z preserved )
JRNZ, AGAIN, RET, JRNZ, AGAIN,
EXAFAF', ( orig ) E SUBr, ( equal? )
IFNZ, SYSVARS 0x41 + ( ~C!ERR ) LD(i)A, THEN,
RET,
( ----- 401 ) ( ----- 401 )
Grid subsystem Grid subsystem

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cvm/stage.bin
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13
doc/impl.txt
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@ -160,9 +160,9 @@ Here's a list of them:
SYSVARS FUTURE USES +3c BLK(* SYSVARS FUTURE USES +3c BLK(*
+02 CURRENT +3e ~C!* +02 CURRENT +3e ~C!*
+04 HERE +41 FUTURE USES +04 HERE +41 ~C!ERR
+06 C<? +43 FUTURE USES +06 C<? +42 FUTURE USES
+08 C<* override +45 FUTURE USES +08 C<* override +43 FUTURE USES
+0a NL ialias +51 CURRENTPTR +0a NL ialias +51 CURRENTPTR
+0c C<* +53 EMIT ialias +0c C<* +53 EMIT ialias
+0e WORDBUF +55 KEY ialias +0e WORDBUF +55 KEY ialias
@ -197,6 +197,10 @@ BLK* "Disk blocks" in usage.txt.
the routine that writes a byte to memory and then returns. the routine that writes a byte to memory and then returns.
Register usage is arch-dependent, see boot code for details. Register usage is arch-dependent, see boot code for details.
~C!ERR: When an error happens during ~C! write overrides, sets
this byte to a nonzero value. Otherwise, stays at zero. Has to
be reset to zero manually after an error.
DRIVERS section is reserved for recipe-specific drivers. DRIVERS section is reserved for recipe-specific drivers.
FUTURE USES section is unused for now. FUTURE USES section is unused for now.
@ -214,7 +218,8 @@ very few things.
2. Set CURRENT to value of LATEST field in stable ABI. 2. Set CURRENT to value of LATEST field in stable ABI.
3. Set HERE to HERESTART const if defined, to CURRENT other- 3. Set HERE to HERESTART const if defined, to CURRENT other-
wise. wise.
4. Execute the word referred to by 0x04 (BOOT) in stable ABI. 4. Initialize ~C! and ~C!ERR to 0.
5. Execute the word referred to by 0x04 (BOOT) in stable ABI.
In a normal system, BOOT is in core words at B396 and does a In a normal system, BOOT is in core words at B396 and does a
few things: few things: