Add wchar_t type; Add LPC17xx CAN driver from Lzyy; Fix serial bug reported by Lzyy

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3775 42af7a65-404d-4744-a932-0658087f49c3

include/sys/types.h

@@ -103,6 +103,9 @@
  ****************************************************************************/
 
 #ifndef __ASSEMBLY__
+
+/* Floating point types */
+
 typedef float  float32;
 #ifndef CONFIG_HAVE_DOUBLE
 typedef float  double_t;
@@ -158,6 +161,14 @@ typedef int          pid_t;
 
 typedef unsigned int id_t;
 
+/* Signed integral type of the result of subtracting two pointers */
+
+typedef intptr_t     ptrdiff_t;
+
+/* Wide, 16-bit character types */
+
+typedef uint16_t     wchar_t;
+
 /* blkcnt_t and off_t are signed integer types.
  *
  *   blkcnt_t is used for file block counts.