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Z80 & 68k Assembly =>
z80 & ez80 Assembly
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b__
Member
Joined: 16 Jun 2003
Posts: 173
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 Posted: 12 Jul 2003 08:51:32 pm Post subject: |
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| How do u display the size of a program? I know that the first two bytes are for the size, the first is the most significant byte, the second is the lsb, but i don't know what the msb and lsb are. |
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Adm.Wiggin
aka Tianon
Know-It-All
Joined: 02 Jun 2003
Posts: 1874
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| Posted: 12 Jul 2003 10:23:27 pm Post subject: |
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have u tried this (comes right after chkfindsym) :
Code:
ld hl,(de)
bcall(_DispHL)
? it should work fine... |
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CoBB
Active Member
Joined: 30 Jun 2003
Posts: 720
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| Posted: 13 Jul 2003 12:11:58 am Post subject: |
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| That won't compile. You can't do "ld hl,(de)". |
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Justin W.
Shattered Silence
Advanced Member
Joined: 24 May 2003
Posts: 429
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| Posted: 13 Jul 2003 01:18:58 am Post subject: |
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Adm.Wiggin wrote: have u tried this (comes right after chkfindsym) : Code: ld hl,(de)
bcall(_DispHL)
? it should work fine...
As Cobb already stated ld hl,(de) is in invalid z80 instruction. If you wanted to get the size of the program into hl and display it, you would have to
Note: All of the code in the examples are to proceed after bcall(_chkfindsym)
Code:
ex de,hl
ld e,(hl)
inc hl
ld h,(hl) ;I have not used this instruction but it is a valid z80 instruction
ld l,e
bcall(_disphl)
One problem, this code would destroy both pointers, the one to the vat entry, and the one to the programs data.
Now to save at least one of your pointers
Code:
ex de,hl;switch pointers de=vat entry, hl=program data
ld e,(hl)
inc hl
ld d,(hl)
inc hl
ex de,hl;switch pointers de=beginning of actual program data, hl=size
push de;save pointer
bcall(_disphl)
pop de;restore pointer
Now you still have the pointer to the program data only it's been moved past the two size bytes and onto the first byte of the actual program data. The flash page is also is still in tact as none of the instructions modify the b register.
Last edited by Guest on 13 Jul 2003 01:24:16 am; edited 1 time in total |
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b__
Member
Joined: 16 Jun 2003
Posts: 173
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| Posted: 13 Jul 2003 03:28:01 pm Post subject: |
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Wouldnt that display hl in hex? I was thinking more like
;(right after chkfindsym)
ex de,hl
ld e,(hl)
inc hl
ld h,(hl)
ld l,e
bcall(_SetXXXXOP2) ;loads hl into op2
bcall(_OP2ToOP1) ;loads op2 into op1
bcall(_DispOP1A) ;displays op1 rounded to A amount of digits
Is this all right? I haven't tested it yet. |
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Tyraniek
Member
Joined: 07 Jun 2003
Posts: 133
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| Posted: 13 Jul 2003 04:25:11 pm Post subject: |
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Quote: bcall(_DispOP1A) ;displays op1 rounded to A amount of digits
I think it displays A rounded to OP1 amount of digits. |
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Justin W.
Shattered Silence
Advanced Member
Joined: 24 May 2003
Posts: 429
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| Posted: 13 Jul 2003 05:09:45 pm Post subject: |
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b__ wrote: Wouldnt that display hl in hex? I was thinking more like
;(right after chkfindsym)
ex de,hl
ld e,(hl)
inc hl
ld h,(hl)
ld l,e
bcall(_SetXXXXOP2) ;loads hl into op2
bcall(_OP2ToOP1) ;loads op2 into op1
bcall(_DispOP1A) ;displays op1 rounded to A amount of digits
Is this all right? I haven't tested it yet.
No you are wrong about that. The rom call bcall(_Disphl) displays the number in decimal format, and no matter what it will take 5 character spaces. |
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b__
Member
Joined: 16 Jun 2003
Posts: 173
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| Posted: 13 Jul 2003 09:35:21 pm Post subject: |
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| Oh. Thanks a lot. |
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Adm.Wiggin
aka Tianon
Know-It-All
Joined: 02 Jun 2003
Posts: 1874
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| Posted: 14 Jul 2003 11:14:07 am Post subject: |
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| with the 5 spaces thing, if the number was 567 then it would display (space)(space)567... just fyi... |
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