TI compiler quirks, and le byte swapping functions.

src/common/tusb_compiler.h

@@ -53,6 +53,9 @@
 // for declaration of reserved field, make use of _TU_COUNTER_
 #define TU_RESERVED           TU_XSTRCAT(reserved, _TU_COUNTER_)
 
+#define TU_LITTLE_ENDIAN (0x12u)
+#define TU_BIG_ENDIAN (0x21u)
+
 //--------------------------------------------------------------------+
 // Compiler porting with Attribute and Endian
 //--------------------------------------------------------------------+
@@ -67,20 +70,80 @@
 
   // Endian conversion use well-known host to network (big endian) naming
   #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
-    #define tu_htonl(u32)  __builtin_bswap32(u32)
-    #define tu_ntohl(u32)  __builtin_bswap32(u32)
-
-    #define tu_htons(u16)  __builtin_bswap16(u16)
-    #define tu_ntohs(u16)  __builtin_bswap16(u16)
+    #define TU_BYTE_ORDER TU_LITTLE_ENDIAN
   #else
-    #define tu_htonl(u32)  (u32)
-    #define tu_ntohl(u32)  (u32)
+    #define TU_BYTE_ORDER TU_BIG_ENDIAN
+  #endif
+
+  static inline uint16_t tu_bswap16(uint16_t u16)
+  {
+    return __builtin_bswap16(u16);
+  }
+
+  static inline uint16_t tu_bswap32(uint16_t u32)
+  {
+    return __builtin_bswap32(u32);
+  }
+
+  #define TU_BSWAP16
+
+#elif defined(__TI_COMPILER_VERSION__)
+  #define TU_ATTR_ALIGNED(Bytes)        __attribute__ ((aligned(Bytes)))
+  #define TU_ATTR_SECTION(sec_name)     __attribute__ ((section(#sec_name)))
+  #define TU_ATTR_PACKED                __attribute__ ((packed))
+  #define TU_ATTR_PREPACKED
+  #define TU_ATTR_WEAK                  __attribute__ ((weak))
+  #define TU_ATTR_DEPRECATED(mess)      __attribute__ ((deprecated(mess))) // warn if function with this attribute is used
+  #define TU_ATTR_UNUSED                __attribute__ ((unused))           // Function/Variable is meant to be possibly unused
 
-    #define tu_htons(u16)  (u16)
-    #define tu_ntohs(u16)  (u16)
+  // __BYTE_ORDER is defined in the TI ARM compiler, but not MSP430 (which is little endian)
+  #if ((__BYTE_ORDER__) == (__ORDER_LITTLE_ENDIAN__)) || defined(__MSP430__)
+    #define TU_BYTE_ORDER TU_LITTLE_ENDIAN
+  #else
+    #define TU_BYTE_ORDER TU_BIG_ENDIAN
   #endif
+
+  static inline uint16_t tu_bswap16(uint16_t u16)
+  {
+    return __builtin_bswap16(u16);
+  }
+
+  static inline uint16_t tu_bswap32(uint16_t u32)
+  {
+    return __builtin_bswap32(u32);
+  }
+#else
+  #error "Compiler attribute porting is required"
+#endif
+
+#if (TU_BYTE_ORDER == TU_LITTLE_ENDIAN)
+  #define tu_htonl(u32)  tu_bswap32(u32)
+  #define tu_ntohl(u32)  tu_bswap32(u32)
+
+  #define tu_htons(u16)  tu_bswap16(u16)
+  #define tu_ntohs(u16)  tu_bswap16(u16)
+
+  #define tu_htole16(x) (x)
+  #define tu_le16toh(x) (x)
+
+  #define tu_htole32(x) (x)
+  #define tu_le32toh(x) (x)
+
+#elif (TU_BYTE_ORDER == TU_BIG_ENDIAN)
+  #define tu_htonl(u32)  (x)
+  #define tu_ntohl(u32)  (x)
+
+  #define tu_htons(u16)  (x)
+  #define tu_ntohs(u16)  (x)
+
+  #define tu_htole16(x) tu_bswap16(u32)
+  #define tu_le16toh(x) tu_bswap16(u32)
+
+  #define tu_htole32(x) tu_bswap32(u32)
+  #define tu_le32toh(x) tu_bswap32(u32)
+
 #else
-  #error "Compiler attribute porting are required"
+  #error Byte order is undefined
 #endif
 
 #endif /* _TUSB_COMPILER_H_ */