[ASM & Hex] Return value from ASM to dialog Script

[JairygonZero]

Hello, I've just begin ROM Hacking for few weeks and now I want to learn ASM/Thumb.
So I've made simple routine to return a simple number (0x5) to a text of a person just for beginning.
The problem is that when I talk to the person it just return 0, maybe I dont know yet how to send that value to the script so can someone plz correct my code.

XSE script:

#org 0x800000
lock
faceplayer
callasm 0x08800101
buffernumber 0x0 LASTRESULT
msgbox 0x8800015 MSG_NORMAL '"the number is [buffer1]"
release

'---------
' Strings
'---------
#org 0x800015
= the number is [buffer1]

thumb:

.align 2
.thumb
main:
	push {r0,lr}
	ldr r0, param
	pop {r0,pc}
.align 2
param:
	.word 0x5

 

[Entaro Ceraphenine]

You need to transfer the value of r0 into the variable LASTRESULT.

Direct Solution:

Spoiler:

.align 2
.thumb
main:
push {r0-r1,lr}
ldr r0, param
ldr r1, =(0x020370D0) @ loads memory address of the variable LASTRESULT
strb r0, [r1] @ put the value of r0 at the address in r1, i.e. puts 0x5 into the variable LASTRESULT
pop {r0-r1,pc}

.align 2
param:
.word 0x5

Just focus on the parts in bold. Those are the parts you need to add. Everything else is alright!
Here is a ram offset map of FireRed which will be handy for making ASMs, as it contains the memory address of variables and other important things.
And this ASM tutorial is quite good, you can follow it: https://www.pokecommunity.com/threads/343871

 

[JairygonZero]

Thank you a lot :D
Apparently, I lacked the knowledge indeed.