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ARM: LPC 2138 Assembly start

Andraz Brus

I want to try programming in asm. How to connect startup file with new asm file?

I make this code:

        GLOBAL prog1
        AREA reset, CODE, READONLY
        ENTRY

prog1
        MOV     R0, #11
stop B stop
        END

I saw in startup code "Enter C code " and then it is calling IMPORT __main. How to change it, so it will import my new asm function?

; Enter the C code

                IMPORT  __main
                LDR     R0, =__main
                BX      R0


                IF      :DEF:__MICROLIB

                EXPORT  __heap_base
                EXPORT  __heap_limit

                ELSE
; User Initial Stack & Heap
                AREA    |.text|, CODE, READONLY

                IMPORT  __use_two_region_memory
                EXPORT  __user_initial_stackheap
__user_initial_stackheap

                LDR     R0, =  Heap_Mem
                LDR     R1, =(Stack_Mem + USR_Stack_Size)
                LDR     R2, = (Heap_Mem +      Heap_Size)
                LDR     R3, = Stack_Mem
                BX      LR
                ENDIF


                END

  • 0

    Programming in assembler is all about freedom. You can do just about anything you like.

    So what about the three options that you either:
    - make your own "start" function named __main?
    - modify the startup file and changes __main into another symbol name?
    - throw away the startup file and write your own - it is after all just standard assembler code.

    You really do have to make huge amounts of decisions when programming - and you can't make use of forums when making your decisions.

    Think about it: what use do you have of heap symbols if you are not going to implement any code that allocates memory from a heap? Decisions, decisions, ...