for SC16IS750 test program. Confirming register access method

Revision:
1:d9a4b7a4a159
Parent:
0:bae17cf3178e
--- a/SC16IS750.h	Wed Jul 18 01:24:33 2012 +0000
+++ b/SC16IS750.h	Wed Jul 18 01:45:38 2012 +0000
@@ -47,7 +47,7 @@
 
     void init_registers( void );
     void set_baud( int );
-    void send_str( char *s );
+    void send_str( const char *s );
     void register_write( char register_address, char data );
     char register_read( char register_address );