Diff: crc.cpp

Revision:

11:dedcebcfc869

Child:

29:b1ec19000e15

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/crc.cpp	Fri Dec 19 09:03:46 2014 +0100
@@ -0,0 +1,85 @@
+/*
+ *  Copyright 2014 Embedded Artists AB
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+ 
+
+/******************************************************************************
+ * Includes
+ *****************************************************************************/
+
+#include "mbed.h"
+#include "crc.h"
+
+
+/******************************************************************************
+ * Defines and typedefs
+ *****************************************************************************/
+
+#define NUM_CRC_BUFF_ENTRIES  (100)
+
+#define CRC32_INIT()  do { LPC_CRC->MODE = 0x00000036; LPC_CRC->SEED = 0xffffffff; } while(0)
+
+#define CRC32_WRITE8(__val)   LPC_CRC->WR_DATA_BYTE.DATA = (uint8_t)(__val)
+#define CRC32_WRITE16(__val)  LPC_CRC->WR_DATA_WORD.DATA = (uint16_t)(__val)
+#define CRC32_WRITE32(__val)  LPC_CRC->WR_DATA_DWORD.DATA = (__val)
+
+#define CRC32_SUM()           LPC_CRC->SUM
+
+/******************************************************************************
+ * External global variables
+ *****************************************************************************/
+
+/******************************************************************************
+ * Local variables
+ *****************************************************************************/
+
+/******************************************************************************
+ * Local Functions
+ *****************************************************************************/
+
+
+/******************************************************************************
+ * Public Functions
+ *****************************************************************************/
+
+uint32_t crc_File(FILE* f)
+{
+  uint32_t* buff = (uint32_t*)malloc(sizeof(uint32_t)*NUM_CRC_BUFF_ENTRIES);
+  if (buff != NULL) {
+    CRC32_INIT();
+    fseek(f, 0, SEEK_SET);
+    memset(buff, 0, sizeof(uint32_t)*NUM_CRC_BUFF_ENTRIES);
+    int numRead = fread(buff, sizeof(uint32_t), NUM_CRC_BUFF_ENTRIES, f);
+    while (numRead > 0) {
+      for (int i = 0; i < numRead; i++) {
+        CRC32_WRITE32(buff[i]);
+      }
+      numRead = fread(buff, sizeof(uint32_t), NUM_CRC_BUFF_ENTRIES, f);
+    }
+    free(buff);
+    return CRC32_SUM();
+  }
+  return 0;
+}
+
+uint32_t crc_Buffer(const uint32_t* data, uint32_t size)
+{
+  CRC32_INIT();
+  for (int i = 0; i < size; i++) {
+    CRC32_WRITE32(data[i]);
+  }
+  return CRC32_SUM();
+}
+