akkera 102 / Mbed 2 deprecated gba_dump_sd

GameBoy Advance Multiboot & Dumper

Dependencies:   SDFileSystem mbed

Diff: crc.cpp

Revision:
0:66a93ef88e4e
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/crc.cpp	Mon Nov 24 13:28:15 2014 +0000
@@ -0,0 +1,35 @@
+#include "crc.h"
+
+static uint32_t r;
+
+uint32_t crcU32n(uint32_t d)
+{
+    uint32_t bit;
+
+    for(bit=0; bit<32; bit++)
+    {
+        if((r ^ d) & 0x01)
+        {
+            r = (r >> 1) ^ 0x0000c37b;
+        }
+        else
+        {
+            r = (r >> 1);
+        }
+
+        d = d >> 1;
+    }
+
+    return r;
+}
+
+uint32_t crcU32(uint32_t d)
+{
+    crcReset();
+    return crcU32n(d);
+}
+
+void crcReset(void)
+{
+    r = 0x0000c387;
+}