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PSoC 5, 3 & 1 MCU

New Contributor II

 Hi,

   

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

   

Hugo

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Employee

 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

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