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C2000: a c macro to a create a variable and place that variable in a specific memory section?

stevenh
Guru 20035 points

Hello,

Is there a way to define a variable using a macro and then in that same macro place that variable in a specific memory section?  

An example of a variable being placed in a macro is shown below.  I would also like place the pfls in a specific section of memory without having to explicitly write #pragma DATA_SECTION(pfls).

Thanks,

Stephen 

typedef struct
{
    int a;
    int b;
} TEST_STRUCT;

static TEST_STRUCT fls;

#define TEST_MACRO(Type,Variable) \
Type * p ## Variable = &Variable \

TEST_MACRO(TEST_STRUCT,fls);

int main(void) {

	return 0;
}

  • 0
    Guru 20035 points

    Hello,

    I came up with the answer (see code below).

    Stephen

    typedef struct
{
    int a;
    int b;
} TEST_STRUCT;

static TEST_STRUCT fls;

// needed to expands quotes in pragma
#define EMIT_PRAGMA(x)  _Pragma(#x)

#define TEST_MACRO(Type,Variable,SectionName) \
EMIT_PRAGMA(DATA_SECTION( p ## Variable ,"SectionName")) \
Type * p ## Variable = &Variable

TEST_MACRO(TEST_STRUCT,fls,unittestSect);

int main(void) {

    int a,b;

    fls.a = 123;
    fls.b = 222;

    a = pfls->a;
    b = pfls->b;

	return 0;
}

  • 0 in reply to stevenh
    TI__Guru**** 244930 points

    That looks like a reasonable solution.  See this wiki article for a detailed explanation of a similar macro.

    Thanks and regards,

    -George

  • 0 in reply to George Mock
    Guru 20035 points
    That's interesting. Thanks.
  • 0 in reply to George Mock
    Guru 20035 points
    The above code works in C, but not C++. Why not?
  • 0 in reply to stevenh
    Guru 20035 points

    Ok, the following change fixed it.

    #define EMIT_PRAGMA(x)  _Pragma(#x)

#ifdef __cplusplus
#define TEST_MACRO(Type,Variable,SectionName) \
EMIT_PRAGMA(DATA_SECTION("SectionName")) \
Type * p ## Variable = &Variable;
#else
#define TEST_MACRO(Type,Variable,SectionName) \
EMIT_PRAGMA(DATA_SECTION( p ## Variable ,"SectionName")) \
Type * p ## Variable = &Variable;
#endif

    
			
    

		
		
		
		
	
    
	
    
		
    
	
    

	            
                	
	
    
				
		                
                
                
                
                
                
                
        		
		
				
    
		
		 
		
		
     
    
	
    

    
			
    
			
    
		
    

		
    
	
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