Diff: FastCRC_cpu.h

Revision:

0:7343f324d853

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/FastCRC_cpu.h	Fri Apr 22 09:51:51 2016 +0000
@@ -0,0 +1,69 @@
+/* FastCRC library code is placed under the MIT license
+ * Copyright (c) 2014,2015 Frank Bösing
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+ 
+// CPU-specific implementations of helper functions
+
+#if !defined(__CORTEX_M4) 
+#if !defined(FastCRC_cpu)
+#define FastCRC_cpu
+
+//Reverse byte order (16 bit)
+#if defined(__thumb__)  
+static __attribute__((section(".rev16_text"))) __INLINE __ASM uint32_t REV16(uint32_t value)
+{
+  rev16 r0, r0
+  bx lr
+}
+#else
+static inline __attribute__((always_inline)) 
+unsigned int REV16( unsigned int value) //generic
+{
+    return (value >> 8) | ((value & 0xff) << 8);
+}
+#endif
+
+
+
+
+
+//Reverse byte order (32 bit)
+#if defined(__thumb__) 
+static __attribute__((section(".rev16_text"))) __INLINE __ASM uint32_t REV32(uint32_t value)
+{
+  rev r0, r0
+  bx lr
+}
+#else
+static inline  __attribute__((always_inline))
+unsigned int REV32( unsigned int value) //generic
+{
+    value = (value >> 16) | ((value & 0xffff) << 16);
+    return ((value >> 8) & 0xff00ff) | ((value & 0xff00ff) << 8);
+}
+#endif
+
+
+#endif
+#endif
\ No newline at end of file