someone gives tip to me.
use sysinfo () function.
I changed my code.
struct sysinfo info;
if ( 0 == sysinfo ( &info ) )
{
printf ( "Free : %ld Shared : %ld Buffer : %ld @@@ %s\r\n", info.freeram, info.sharedram, info.bufferram, szFunctionName );
}
It's good working.
Thanks.