Use of pointer with CrossStudio

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1

Dear Forum Members,

I am using CrossStudio for MSP430F1611. My code is having following routine for copying data from one structure to another.

void mem_cpy(void *pp_dest,void *pp_source, unsigned char size)

{

1 #define p_dest ((unsigned char *)pp_dest)

2 #define p_source ((unsigned char *)pp_source)

3

4 while(size)

5 {

6 *p_dest = *p_source;

7 *p_source = p_source++ ;

8 *p_dest = p_dest++ ;

9 size-- ;

10 }

11

12 #undef p_dest

13 #undef p_source

}

The compiler is giving error at line 7 and 8 as lvalue required. Can anyone please clarify the error in code? Is there any limitation for using pointer (void pointer) with CrossStudio?

Thanks in advance.

2

You should be incrementing the pointers, not the data you are pointing to…

while (size--) {
*pdest = *psource;
pdest++;
psource++;
}

[/code]

3

hello,

I tried the same but it gives error at pdest++ and psource++ statements as lvalue required. If I change the function declaration to unsigned char instead of void, then this works. Is it any way related to compiler settings? if yes, which? As this is standard C syntax, what could be the error? Please clarify the error.

Thanks in advance.