1 Reply Latest reply on Oct 15, 2011 2:14 AM by pushekm_21

    Accessing a C array from assembler routine




      I have an array defined in C:


          char return_data[32];


      I need access to this from an asm routine. What do I need to add to the .asm file to inform the compiler / linker of the existence of return_data ?


      Many thanks



        • 1. Re: Accessing a C array from assembler routine

           If you want to access any of the C variables from assembly then you have to use "_" in front of their name. For accessing any array you can use indexed addressing mode, here is an example for the same.




          For accessing an array from assembly, X will point to the index.




          RAM_SETPAGE_IDX >_MyBufferName      ; This instruction is required when your device have more than one page of RAM and paging is enabled.


          mov     A, [X + _MyBufferName]


          inc / dec    X