ASM To be or not to be?

Cool :-D

This is my version of your code in thumb lol:

Code:

---

@Convert to thumb
add r2, pc, #1
bx r2
.thumb
 
ldr r5,Mail        @r5 holds mail
ldr r3,Drawer      @r3 holds drawer
mov r1,#0xC        @C in hexadecimal=12 in decimal  (0x21EC200+0xC should give yu tenth slot)
ldrh r0,=0x894    @Lol i think...[0x021D8014+0x894=-0x21D88A8 (last mail slot)
 
Loop:
ldrh r2,[r3,r1]    @load items in last slot of drawer
strh r2,[r5,r0]    @store that item in last slot of mail
sub r0,r0,#0xF4    @subtract the difference
sub r1,r1,#0x2    @subtract the difference so now theres an item in all slots
bpl Loop             
bx lr                   
 
.arm
Mail:
.long 0x21D8014
Drawer:
.long 0x21EC200

---

Compiles to [activator L+R]:

Code:

---

94000130 FCFF0000
023FF090 012FFF11
E0000000 00000028
E28F2001 E12FFF12
4B054D04 4805210C
522A5A5A 390238F4
4770D5FA 021D8014
021EC200 00000894
023FF090 E3520003
D2000000 00000000

---

I'll try to test it but I don't entirely understand what you did! Lol

What dont you understand about it...?

I think i figured it out. Thanks though! :D

No problem. :p

I made my code shorter...

heres my version in thumb. (Needs activator and terminator added if one were to use it.)

023FF090 012FFF11
E0000000 0000002A
E28F2001 E12FFF12
49054806 880D4C03
31028005 42A130F4
4770DDF9 021EC212
021EC200 021D8014
0000F402 00000000
023FF090 E3520003

Heres the source:

@{{Convert to thumb}}
add r2, pc, #1
bx r2
.thumb

ldr r0, Mail
ldr r1, Dresser
ldr r4, Limit

Fred:
ldrh r5, [r1]
strh r5, [r0]
add r1, #0x2
add r0, #0xf4
cmp r1, r4
ble Fred
bx lr

.arm
Limit:
.long 0x021ec212
Dresser:
.long 0x021ec200
Mail:
.long 0x021d8014
D:
.byte 0x02
M:
.byte 0xf4

Cool. Using the Code BBC is better.

Example:

Code:

---

023FF090 012FFF11
E0000000 0000002A
E28F2001 E12FFF12
49054806 880D4C03
31028005 42A130F4
4770DDF9 021EC212
021EC200 021D8014
0000F402 00000000
023FF090 E3520003

---

Code:

---

@{{Convert to thumb}}
add r2, pc, #1
bx r2
.thumb
 
ldr r0, Mail
ldr r1, Dresser
ldr r4, Limit
 
Fred:
ldrh r5, [r1]
strh r5, [r0]
add r1, #0x2
add r0, #0xf4
cmp r1, r4
ble Fred
bx lr
 
.arm
Limit:
.long 0x021ec212
Dresser:
.long 0x021ec200
Mail:
.long 0x021d8014
D:
.byte 0x02
M:
.byte 0xf4

---

Since this is an ASM thread, I'll ask one of my own questions
In THUMB, I noticed there's an "if-then" instruction, but I can't figure out how to use it. If I could figure it out, I could execute conditional stuff in THUMB (like streq, strne, etc)
Does anyone here know how?

Code:

---

Makes up to four following instructions conditional, according to pattern. pattern is a string of up to three
letters. Each letter can be T (Then) or E (Else).
The first instruction after IT has condition cond. The following instructions have condition cond if the
corresponding letter is T, or the inverse of cond if the corresponding letter is E.

---

I do that but it never compiles, and keeps saying "incorrect condition in IT block"

Well.. I am still not very good at asm but I understand the basics so I am happy :D

But I do have a question that I would like answered please...

How do you trace or use a debugger to find the asm a game uses?
I want to find the asm in acww for digging holes and things like that.
Also.. is their a specific nds code for NOP? Or is it just a bunch of zeros?

Thank you!!

Sincerely,

~Drew956
(Also I think I need to download an emulator to use a debugger right? Do I need to download anything else?)