Hello folks, New to this world, I am trying to write an assembler only application with the mbed compiler. To do this i create a Main.s source file containing the program below (which do nothing! but serve just to see if it is working) This code is very similar to the ARM documentation ---------------------------------------------------------------- AREA main, CODE ; Name of code main MOVS r0, #10 ; Set up parameters MOVS r1, #3 ADD r0, r0, r1 ; r0 = r0 + r1 END ------------------------------------------------------------------- I get a compiler error 241 What i have done so far is introducing some modification in the code ( like changing MOVS by MOV) to prove that the assembler is doing the job by issuing error and this the case. I guess that the assembly job is done and that the problem may come at the linkedit level (but not sure). My questions: Is there some documentation about the error codes? Can someone give me the explanation of error 241. Many thanks in advance Gérard

        AREA    main, CODE     
        EXPORT  main
        EXPORT  __initial_sp
        MOVS     r0, #10      
        MOVS     r1, #3
        ADD      r0, r0, r1    
        AREA     dataprog, DATA
test    DCB      10 
__initial_sp DCB 10    ; note the 2 underscore!
        END                    

Giving an answer to my own post! Finally the source which compile perfectly, even if it is a non usable program <<code title=test program>> AREA main, CODE EXPORT main EXPORT __initial_sp MOVS r0, #10 MOVS r1, #3 ADD r0, r0, r1 AREA dataprog, DATA test DCB 10 __initial_sp DCB 10 ; note the 2 underscore! END <</code>> Now i may start to work.... Gérard

<<quote Recifarium>> AREA main, CODE EXPORT main EXPORT __initial_sp MOVS r0, #10 MOVS r1, #3 ADD r0, r0, r1 AREA dataprog, DATA test DCB 10 __initial_sp DCB 10 ; note the 2 underscore! END <</quote>>