Skip to content

Latest commit

 

History

History
72 lines (50 loc) · 1.33 KB

examples.md

File metadata and controls

72 lines (50 loc) · 1.33 KB
Raw

Examples

Like other MSP430 assemblers, naken430asm accepts C style .define, .ifdef, .if defined(). An example would be:

.define BLAH 50
.define SOMETHING

Alternatively, to help with compatibility with include files from other assemblers .define and .include can be written as #define and #include:

#define BLAH 50

To test for a definition the following code works:

.ifdef SOMETHING
  mov.w r1, r12
.else
  mov.w r3, r12
.endif

or

.if defined(SOMETHING) && !defined(ANOTHER) && BLAH>50
  mov.w @r12+, r3
.endif

Standard assembler syntax "equ" is also accepted too:

BLAH equ 50

Also .macro / .endm works like the following:

.macro BLAH
  mov.w #5, r10
  mov.w #6, r11
.endm

or also:

.macro BLAH(a,b)
  mov.w #a, r10
  mov.w #b, r11
.endm

If there is need for a label inside of a macro, the scoping feature can be used:

.macro PAUSE(a)
  mov.w #100, r6
.scope
wait:
  dec.w r6
  jnz wait
.ends
.endm

Scoping is also possible inside of function definitions. In the example below, the label wait will not be available outside this function and can be reused:

.func pause
wait:
  dec.w r6
  jnz wait
.endf

call #pause

The $ can be used as the current address, so to make an infinite loop:

jmp $