blinking

[rapper.git] / bitbucket_lpc1768 / lpcrc / lpcrc.c

diff --git a/bitbucket_lpc1768/lpcrc/lpcrc.c b/bitbucket_lpc1768/lpcrc/lpcrc.c
new file mode 100644 (file)
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+++ b/bitbucket_lpc1768/lpcrc/lpcrc.c
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+/*
+ * Software License Agreement (BSD License)
+ *
+ * Copyright (c) 2010, Roel Verdult
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the copyright holders nor the
+ * names of its contributors may be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ *  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+
+#define BLOCK_COUNT 7
+#define BLOCK_LENGTH 4
+#define BLOCK_TOTAL (BLOCK_COUNT*BLOCK_LENGTH)
+
+typedef unsigned char byte_t;
+
+int main(int argc, char *argv[])
+{
+  FILE* pf;
+  byte_t buf[BLOCK_TOTAL];
+  uint32_t crc = 0;
+  uint32_t block;
+  
+  // Check for required arguments
+  if (argc < 2)
+  {
+    printf("syntax: lpcrc <firmware.bin>\n");
+    return 1;
+  }
+  
+  // Try to open the supplied firmware
+  if ((pf = fopen(argv[1],"rb+")) == NULL)
+  {
+    printf("error: could not open file [%s] with write access\n",argv[1]);
+    return 1;
+  }
+
+  // Read out the data blocks used for crc calculation
+  if (fread(buf,1,BLOCK_TOTAL,pf) != BLOCK_TOTAL)
+  {
+    printf("error: could not read required bytes\n");
+    fclose(pf);
+    return 1;
+  }
+
+  // Compute the crc value
+  for (block=0; block<BLOCK_COUNT; block++)
+  {
+    crc += *((uint32_t*)(buf+(block*BLOCK_LENGTH)));
+  }
+  crc = (~crc) + 1;
+  
+  // Reposition the file stream indicator to switch between read and write
+  if (fseek(pf,0,SEEK_CUR) != 0)
+  {
+    printf("error: could not switch from read to write mode\n");
+    fclose(pf);
+    return 1;
+  }
+  
+  // Write the crc back to the file
+  if (fwrite((byte_t*)&crc,1,BLOCK_LENGTH,pf) != BLOCK_LENGTH)
+  {
+    printf("error: could not write crc back to file\n");
+    fclose(pf);
+    return 1;
+  }
+
+  printf("succesfully updated crc to: %08x\n",crc);
+  fclose(pf);
+  
+  return 0;
+}
+