Need help with makeing codes.

[Demonic722]

What I'm saying is that different "Bit-writes" hold different amount of data.
The "0 Codetype" is a 32-Bit and can hold as many as 8 characters of data.
The 1 codetype can hold as many as 4 and the 2 codetype can hold as many as 2.

Example of Codetype 0:

021D891C 0001869F

Example of Codetype 1:

121D88FE 000013FF

Example of Codetype 2:

221D8FC8 00000001

32-Bits hold twice as much as 16-Bits and 4 times as much as 8-bits.
16-Bits hold twice as much as 8-Bits.

You have to keep re-reading it to fully understand the basics first..
Edit: Its really late where I am so I'll be back on tomorrow, but while I'm gone you should re-read
the tutorial a few times so you can fully understand it.
This could help right now:

Bit Writes:
•8-bit writes=2XXXXXXX 000000YY
•16-bit writes=1XXXXXXX 0000YYYY
•32-bit writes=0XXXXXXX YYYYYYYY

•8-bit= writes up to 0-2 digits
•16-bit= writes up to 3-4 digits
•32-bit= writes up to 5-8 digits

You could also use this as a tutorial (one I made a long time ago once your ready for ASM):

Registers: Registers is like a dresser that you could use to put and take stuff out of. Registers that can be used freely: r0, r1, r2, r3, r4, r5, r8, r11, r12

Loading Commands:
•ldr=loads 32-bit write
•ldrh=loads 16-bit write
•ldrb=loads 8-bit write

Storing Commands:
•str=stores 32-bit write
•strh=stores 16-bit write
•strb=stores 8-bit write

*Additional Info on bit-writes*
Some Conversions:
•8bits=1byte
•4bits=half byte
•1byte=2digits

Bit Writes:
•8-bit writes=2XXXXXXX 000000YY
•16-bit writes=1XXXXXXX 0000YYYY
•32-bit writes=0XXXXXXX YYYYYYYY

•8-bit= writes up to 0-2 digits
•16-bit= writes up to 3-4 digits
•32-bit= writes up to 5-8 digits

*All Addresses on the Nintendo DS are 32-bit writes, they change on what you write to them.*

Other Commands You Need:
•mov=moves a register to another register (copies), or loads direct values (ex: mov r1, #2)
•add= adds a number to the value in a register (ex: add r1, #1)
•sub= subtracts a number of the value in a register (ex: sub r1, #1)
•subs= combination of cmp and sub
•cmp= compares a register to see if they are equal or not and whether or not to make the code continue or not (ex: cmp r1, r2)

Some cmp add-ons: b=branch
•blt=less than
•bgt=greater than
•beq=equal to
•bne=not equal
•bge=greater than or equal to
•ble=less than or equal to
•bxne lr=end if not equal

More Commands You Need:
•lsl= logical shift left (can be used to multiply)
•lsr= logical shift right (can be used to divide)
•tst= test a register to another
•bx lr/bx r14=end code

*There are more advanced commands*


Simple NDS Code: <Animal Crossing Wild World [U] [1.0]>
Code: Put 99,000 bells into Inventory Slot 1

ldr r0, Slot1 @loads slot 1 into register 0
ldrh r1, Item @loads item (99,000) into register 1
strh r1, [r0] @stores the money into slot 1 (register 0)
bx lr @end code

Slot1:
.long 0x21D88FE
Item:
.short 0x14FD

*The compiler would ignore anything after the @ so adding notes helps*

Analyzing the code [in depth]:
ldr r0, Slot1=load the 32bit Slot address, now r0 holds the slot
ldrh r1, Item=load the 16bit item, now r1 holds the money
strh r1, [r0]=store the 16bit item into the 32bit slot [store the money in the slot]
bx lr=end the code

The Literals:
Slot1=defines the name of the slot
.long 0x21D88FE=defines the slot 1 address [.long defines 32bit writes]
Item=defines the item
.short 0x14FD=defines the 99,000 money hex [.short defines 16bit writes]