How do I declare a variable in inline ARM Assembly?

What compiler and hardware platform are you using?

In general whatever the compiler one would normally declare any statics using C rather than in an asm. In gcc one would have to say the static is an input or output of the asm as appropriate.

Which complier version are you using?
If your using Arm Compiler 5, you can use "Use MOV Rn, expression" which generates a load from a literal pool as stated in arminfo.emea.arm.com/.../chr1359124248868.html.

if you're using inline assembler in a C or C++ program, you should just define the variable in the C part of the code:

   static uint32_t variable = 0x22222222;

For a separate module using the gnu assembler, data and program space get relocated at link time as appropriate for the chip, so you have to explicitly tell the assembler which "section" to put things in using ".data", ".text", or ".section" directives.  It would look something like:

.data

variable: .long 0x22222222   // global variable

.text

myfunc:

   ldr r1, =variable  ;; get addr of variable from pc-relative constant
   ldr r2, [r1]       ;; get the actual value of variable
   str r2, [r1]         ;; store it back.