Author Topic: I don't know what's wring with this code D: (Read 2835 times)

Yeong · « **on:** October 30, 2011, 09:08:07 am »

In my opinion, this should work. After I compile it, it worked for while and it sharted to go haywire and crashed my calc. What did I do wrong?

Code: [Select]

.org userMem-2
.db $BB, $6D
   BCALL ClrLCDFull
   CALL INITCOOR
   LD HL,PIE
   BCALL PutS
LOOP:
   BCALL getKey
   CP kUp
   CALL Z,GOUP
   CP kDown
   CALL Z,GODOWN
   CP kRight
   CALL Z, GORIGHT
   CP kLeft
   CALL Z,GOLEFT
   CP kClear
   RET Z
   BCALL ClrLCDFull
   CALL INITCOOR
   LD HL,PIE
   BCALL PutS
   JR LOOP
PIE:
.db "pi_symbol",0
COOR:
.db 0,0
INITCOOR:
   LD HL,COOR
   LD A,(HL)
   LD (CURROW),A
   LD HL,COOR+1
   LD A,(HL)
   LD (CURCOL),A
   RET
GOUP:
   LD HL,COOR
   LD A,(HL)
   DEC A
   LD (HL),A
   RET
GODOWN:
   LD HL,COOR
   LD A,(HL)
   INC A
   LD (HL),A
   RET
GOLEFT
   LD HL,COOR+1
   LD A,(HL)
   DEC A
   LD (HL),A
   RET
GORIGHT:
   LD HL,COOR+1
   LD A,(HL)
   INC A
   LD (HL),A
   RET

Keoni29 · « **Reply #1 on:** October 30, 2011, 09:43:40 am »

Quote from: yeongJIN_COOL on October 30, 2011, 09:08:07 am

In my opinion, this should work. After I compile it, it worked for while and it sharted to go haywire and crashed my calc. What did I do wrong?
Code: [Select]
.org userMem-2 .db $BB, $6D BCALL ClrLCDFull CALL INITCOOR LD HL,PIE BCALL PutS LOOP: BCALL getKey CP kUp CALL Z,GOUP CP kDown CALL Z,GODOWN CP kRight CALL Z, GORIGHT CP kLeft CALL Z,GOLEFT CP kClear RET Z BCALL ClrLCDFull CALL INITCOOR LD HL,PIE BCALL PutS JR LOOP PIE: .db "pi_symbol",0 COOR: .db 0,0 INITCOOR: LD HL,COOR LD A,(HL) LD (CURROW),A LD HL,COOR+1 LD A,(HL) LD (CURCOL),A RET GOUP: LD HL,COOR LD A,(HL) DEC A LD (HL),A RET GODOWN: LD HL,COOR LD A,(HL) INC A LD (HL),A RET GOLEFT LD HL,COOR+1 LD A,(HL) DEC A LD (HL),A RET GORIGHT: LD HL,COOR+1 LD A,(HL) INC A LD (HL),A RET

You forgot a :
There is supposed to be a : after GOLEFT
Even though I don't know shit about asm

Xeda112358 · « **Reply #2 on:** October 30, 2011, 09:57:35 am »

(note: we talked on IRC

)
Here is a version that is a little more optimised. I could do another optimisation, but that would probably just cause some confusion

And it only saves 2 bytes, anyway...

Code: [Select]

Loop:
     bcall(_ClrScrnFull)      ;Clears the homescreen
     ld hl,(Coor)
     ld (CurRow),hl
     ld hl,PIE
     bcall(_PutS)
     bcall(_getkey)
     ld hl,(Coor)           ;obtains the current cursor coordinates (l=row, h=col)
     ld d,h \ ld e,l
TestRightKey:
     dec a            ;if a was 1, it becomes 0 and sets the z flag
     jr nz,TestLeftKey
       inc d
TestLeftKey:
     dec a
     jr nz,TestUpKey
       dec d
TestUpKey:
     dec a
     jr nz,TestDownKey
       dec e
TestDownKey:
     dec a
     jr nz,TestClearKey
       inc e
TestClearKey:
;At this point, "a" has been decremented 4 times, so we test kClear-4
     cp kClear-4 \ ret z
CheckBounds:
     ld a,e \ and 7
     ld l,a
     ld a,d \ cp 8
     jr nc,NotOutOfXBound
       ld h,d
NotOutOfXBound
     ld (Coor),hl
     jr Loop
PIE:
.db "pi_symbol",0
Coor:
.dw 0

Yeong · « **Reply #3 on:** October 30, 2011, 10:21:14 am »

Quote from: Keoni29 on October 30, 2011, 09:43:40 am

Quote from: yeongJIN_COOL on October 30, 2011, 09:08:07 am
In my opinion, this should work. After I compile it, it worked for while and it sharted to go haywire and crashed my calc. What did I do wrong?
Code: [Select]
.org userMem-2 .db $BB, $6D BCALL ClrLCDFull CALL INITCOOR LD HL,PIE BCALL PutS LOOP: BCALL getKey CP kUp CALL Z,GOUP CP kDown CALL Z,GODOWN CP kRight CALL Z, GORIGHT CP kLeft CALL Z,GOLEFT CP kClear RET Z BCALL ClrLCDFull CALL INITCOOR LD HL,PIE BCALL PutS JR LOOP PIE: .db "pi_symbol",0 COOR: .db 0,0 INITCOOR: LD HL,COOR LD A,(HL) LD (CURROW),A LD HL,COOR+1 LD A,(HL) LD (CURCOL),A RET GOUP: LD HL,COOR LD A,(HL) DEC A LD (HL),A RET GODOWN: LD HL,COOR LD A,(HL) INC A LD (HL),A RET GOLEFT LD HL,COOR+1 LD A,(HL) DEC A LD (HL),A RET GORIGHT: LD HL,COOR+1 LD A,(HL) INC A LD (HL),A RET
You forgot a :
There is supposed to be a : after GOLEFT
Even though I don't know shit about asm

That was a typo

I do have a colon after that because otherwise, Mimas won't let me compile

Quote from: Xeda112358 on October 30, 2011, 09:57:35 am

(note: we talked on IRC )
Here is a version that is a little more optimised. I could do another optimisation, but that would probably just cause some confusion And it only saves 2 bytes, anyway...
Code: [Select]
Loop: bcall(_ClrScrnFull) ;Clears the homescreen ld hl,(Coor) ld (CurRow),hl ld hl,PIE bcall(_PutS) bcall(_getkey) ld hl,(Coor) ;obtains the current cursor coordinates (l=row, h=col) ld d,h \ ld e,l TestRightKey: dec a ;if a was 1, it becomes 0 and sets the z flag jr nz,TestLeftKey inc d TestLeftKey: dec a jr nz,TestUpKey dec d TestUpKey: dec a jr nz,TestDownKey dec e TestDownKey: dec a jr nz,TestClearKey inc e TestClearKey: ;At this point, "a" has been decremented 4 times, so we test kClear-4 cp kClear-4 \ ret z CheckBounds: ld a,e \ and 7 ld l,a ld a,d \ cp 8 jr nc,NotOutOfXBound ld h,d NotOutOfXBound ld (Coor),hl jr Loop PIE: .db "pi_symbol",0 Coor: .dw 0

What is .dw?

Xeda112358 · « **Reply #4 on:** October 30, 2011, 11:19:03 am »

.dw sets a little-endian word (2 bytes) I don't know if Mimas supports that, if not, do .db 0,0

For example, .dw 5 is 0500 in memory

NanoWar · « **Reply #5 on:** October 30, 2011, 11:29:47 am »

You can do "inc (hl)" btw.
http://www.ticalc.org/pub/text/z80/z80_reference.txt

chickendude · « **Reply #6 on:** October 30, 2011, 03:42:39 pm »

Ok, so it's been a few months since i've touched z80, but i think you could do something like this:

Code: [Select]

 cp 3 ;check if we are going horizontally or vertically, i might have this backwards
 jr c,skip
  inc hl
skip:
 rla
 rla
 jr nc,skip2 ;if no carry (ie. down or right was pressed)
 dec (hl)
 jr skip3
skip2:
 inc (hl)
skip3:

Here are your equates:
kDown .equ 04h
kUp .equ 03h
kLeft .equ 02h
kRight .equ 01h

10000000 right
01000000 left
11000000 up
00100000 down

after first shift we have:
00 r
10 l
10 u
01 d
which is more usable, as with r/d we need to increment and with l/u we need to decrement. Now another shift lets us use the carry flag. To do boundary checking, you could just use b instead of acting directly on hl:

Code: [Select]

 ld b,1
 cp 3
 jr c,skip
  inc hl
skip:
 rla
 rla
 jr nc,skip2
 dec b
 dec b
skip2:
 ld a,(hl)
 add a,b
;boundary checking
 ld (hl),a

You'd probably also want to test that a>0 & a<5, or at least that a isn't 0. I'm not sure if the code i gave you will actually work as i just wrote it off the top of my head, but maybe it'll give you something to think about even if it's completely useless

EDIT: Oh, and of course you would ld hl,Coor beforehand (vs ld hl,(Coor)).
EDIT2: Ah! And one more thing, i'd check for kClear before the other tests.
EDIT3: I imagine you've already discussed it, but the problem with your original code is probably your calls. You check a key, change the value of "a", then return to check for another key. You are almost certainly calling multiple labels at a time at each keypress (especially since many of the X/Y values match the getkey values)

Author Topic: I don't know what's wring with this code D: (Read 2835 times)

Yeong

I don't know what's wring with this code D:

Keoni29

Re: I don't know what's wring with this code D:

Xeda112358

Re: I don't know what's wring with this code D:

Yeong

Re: I don't know what's wring with this code D:

Xeda112358

Re: I don't know what's wring with this code D:

NanoWar

Re: I don't know what's wring with this code D:

chickendude

Re: I don't know what's wring with this code D: