Tool/software: Code Composer Studio
Hey,
What do the symbols in assembly (@, #,*) mean?
How do you handle pointers and values in C28x Assembly??
Example:
Hi '7907,
I don't think it is really that simple.
Generally # is an immediate and @ is a reference
For example, the first addressing mode (direct):
The first #VarA is really just moving a constant into the DP, because the assembler knows the data page where VarA resides at assemble time.
Then the @VarA is again encoding some know offset from the DP base into the instruction, and it is fetching the value of VarA directly based on that offset.
So # and @ work together in this case to directly read VarA.
Indirect addressing modes wtih ' * ' are more similar to a pointer dereference.
I'd just read and understand all the modes carefully and also look at the possible addressing modes + documentation for each instruction you want to use carefully.
Also, any particular reason to use assembly? Even for performance critical applications, we'd recommend using C first, then turning up the optimization level, then finally resorting to hand-tuned assembly only for the most critical inner loops, only if necessary. The compiler is pretty good and knows all the tricks to get good performance from the HW; it'll usually beat hand-assembly unless you are really willing to go deep into understanding the CPU ISA and pipeline.
