Assembly code for arm

Odd that the assembler is reporting a syntax error for line 3, which is blank!

Are your directives and instructions indented from the left column?

Is "start" a label? Usually these need a colon at the end. (Where they're defined, not where they're referenced.)

Find some sample code and compare it to your code. The problem should become obvious.

 

I don't know. I don't know ARM assembly language. What does the assembler manual say about it? Have you checked my other suggestions?

 

As far as I can see from comparing your code with an example in the 'ARM Assembly Language - an Introduction' by J.R. Gibson, the only actual fault you have, is to use a mixed upper/ lower case to the directive Area,. You can use either upper OR lower case, but NOT a mix. Since the AREA directive is the first directive for the program block, it is natural that all the rest of the code is not recognized after missing the directive.
The case rules are the same for mnemonics too, select the case you want to use, and no mixing upper / lower case.

why does we use this line
Area example , code readonly

This line tells the assembler that AREA is a section of the program with additional options. CODE and READONLY indicate that the section contain instructions and that code produced may be put in readonly memory. 'example' is the title of the program, chosen by the programmer.

The B stop is an instruction to branch always to 'stop'. The effect is to let the program loop until the operator break from the IDE.

 

dear first of all you are making two labels then assign colon) in-front of them
like
start:

stop:

2nd syntax error is in add command!
this is correct one.
ADD Rd,Rr
similarly,
MOV R , value