Add 'mdelay()' function to busy-wait for given number of milli-seconds

firmware/include_board/board_common.h

@@ -24,6 +24,7 @@
 #include "stdlib.h"
 #include "string.h"
 #include "inttypes.h"
+#include "syscalls.h"
 
 #define MIN(a, b)       ((a < b) ? a : b)
 

firmware/include_board/syscalls.h

@@ -50,8 +50,6 @@
 
 extern caddr_t _sbrk ( int incr ) ;
 
-extern int link( char *old, char *new ) ;
-
 extern int _close( int file ) ;
 
 extern int _fstat( int file, struct stat *st ) ;
@@ -63,3 +61,5 @@ extern int _lseek( int file, int ptr, int dir ) ;
 extern int _read(int file, char *ptr, int len) ;
 
 extern int _write( int file, char *ptr, int len ) ;
+
+extern void mdelay(unsigned int msecs);