Question

I am compiling the following code for a PIC32 with C32 v1.12 using MPLabX IDE.
The code compiles find but hangs on malloc(), it does not seem to matter what size I am attempting to malloc it always hangs.

By hang I mean the debugger becomes unresponsive and the application has to be manually restarted before it will continue.

#define SAFE_DELETE( x ) { if(x != NULL ) { free(x); x=NULL ; } } 

BOOL Test_Malloc() {

    int *ptr = NULL ;
    ptr = (int*)malloc(10 * sizeof (int)); // With a cast
    if( ptr != NULL ) {
        SAFE_DELETE( ptr );
        return TRUE ;
    }
    return FALSE ; 
}

My question is ;

• How do I malloc memory on a PIC32 with C32 v1.12?

Answer 1

Make sure to set your project’s heap size at least 4KB greater than the maximum amount of dynamic memory you might ever need. You have to guesstimate what what the C library might need if you call functions that themselves call malloc. It’s not quite an exact science.

See this Microchips forum thread for more details.