Revision 584:7c5a5136e412, committed 2015-07-08

Comitter:

mbed_official

Date:

Wed Jul 08 07:45:08 2015 +0100

Parent:

583:967d0d8b7aed

Child:

585:a1ed5b41f74f

Commit message:

Synchronized with git revision a15892332f7dfbf7685582956fd7fa377aaddb51

Full URL: https://github.com/mbedmicro/mbed/commit/a15892332f7dfbf7685582956fd7fa377aaddb51/

Update mbed_overrides.c

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/hal/TARGET_Freescale/TARGET_KPSDK_MCUS/TARGET_MCU_K64F/TARGET_FRDM/crc.c	Wed Jul 08 07:45:08 2015 +0100
@@ -0,0 +1,234 @@
+/**********************************************************************
+ *
+ * Filename:    crc.c
+ * 
+ * Description: Slow and fast implementations of the CRC standards.
+ *
+ * Notes:       The parameters for each supported CRC standard are
+ *				defined in the header file crc.h.  The implementations
+ *				here should stand up to further additions to that list.
+ *
+ * 
+ * Copyright (c) 2000 by Michael Barr.  This software is placed into
+ * the public domain and may be used for any purpose.  However, this
+ * notice must not be changed or removed and no warranty is either
+ * expressed or implied by its publication or distribution.
+ **********************************************************************/
+ 
+#include "crc.h"
+
+
+/*
+ * Derive parameters from the standard-specific parameters in crc.h.
+ */
+#define WIDTH    (8 * sizeof(crc))
+#define TOPBIT   (1 << (WIDTH - 1))
+
+#if (REFLECT_DATA == TRUE)
+#undef  REFLECT_DATA
+#define REFLECT_DATA(X)			((unsigned char) reflect((X), 8))
+#else
+#undef  REFLECT_DATA
+#define REFLECT_DATA(X)			(X)
+#endif
+
+#if (REFLECT_REMAINDER == TRUE)
+#undef  REFLECT_REMAINDER
+#define REFLECT_REMAINDER(X)	((crc) reflect((X), WIDTH))
+#else
+#undef  REFLECT_REMAINDER
+#define REFLECT_REMAINDER(X)	(X)
+#endif
+
+
+/*********************************************************************
+ *
+ * Function:    reflect()
+ * 
+ * Description: Reorder the bits of a binary sequence, by reflecting
+ *				them about the middle position.
+ *
+ * Notes:		No checking is done that nBits <= 32.
+ *
+ * Returns:		The reflection of the original data.
+ *
+ *********************************************************************/
+static unsigned long
+reflect(unsigned long data, unsigned char nBits)
+{
+	unsigned long  reflection = 0x00000000;
+	unsigned char  bit;
+
+	/*
+	 * Reflect the data about the center bit.
+	 */
+	for (bit = 0; bit < nBits; ++bit)
+	{
+		/*
+		 * If the LSB bit is set, set the reflection of it.
+		 */
+		if (data & 0x01)
+		{
+			reflection |= (1 << ((nBits - 1) - bit));
+		}
+
+		data = (data >> 1);
+	}
+
+	return (reflection);
+
+}	/* reflect() */
+
+
+/*********************************************************************
+ *
+ * Function:    crcSlow()
+ * 
+ * Description: Compute the CRC of a given message.
+ *
+ * Notes:		
+ *
+ * Returns:		The CRC of the message.
+ *
+ *********************************************************************/
+crc
+crcSlow(unsigned char const message[], int nBytes)
+{
+    crc            remainder = INITIAL_REMAINDER;
+	int            byte;
+	unsigned char  bit;
+
+
+    /*
+     * Perform modulo-2 division, a byte at a time.
+     */
+    for (byte = 0; byte < nBytes; ++byte)
+    {
+        /*
+         * Bring the next byte into the remainder.
+         */
+        remainder ^= (REFLECT_DATA(message[byte]) << (WIDTH - 8));
+
+        /*
+         * Perform modulo-2 division, a bit at a time.
+         */
+        for (bit = 8; bit > 0; --bit)
+        {
+            /*
+             * Try to divide the current data bit.
+             */
+            if (remainder & TOPBIT)
+            {
+                remainder = (remainder << 1) ^ POLYNOMIAL;
+            }
+            else
+            {
+                remainder = (remainder << 1);
+            }
+        }
+    }
+
+    /*
+     * The final remainder is the CRC result.
+     */
+    return (REFLECT_REMAINDER(remainder) ^ FINAL_XOR_VALUE);
+
+}   /* crcSlow() */
+
+
+crc  crcTable[256];
+
+
+/*********************************************************************
+ *
+ * Function:    crcInit()
+ * 
+ * Description: Populate the partial CRC lookup table.
+ *
+ * Notes:		This function must be rerun any time the CRC standard
+ *				is changed.  If desired, it can be run "offline" and
+ *				the table results stored in an embedded system's ROM.
+ *
+ * Returns:		None defined.
+ *
+ *********************************************************************/
+void
+crcInit(void)
+{
+    crc			   remainder;
+	int			   dividend;
+	unsigned char  bit;
+
+
+    /*
+     * Compute the remainder of each possible dividend.
+     */
+    for (dividend = 0; dividend < 256; ++dividend)
+    {
+        /*
+         * Start with the dividend followed by zeros.
+         */
+        remainder = dividend << (WIDTH - 8);
+
+        /*
+         * Perform modulo-2 division, a bit at a time.
+         */
+        for (bit = 8; bit > 0; --bit)
+        {
+            /*
+             * Try to divide the current data bit.
+             */			
+            if (remainder & TOPBIT)
+            {
+                remainder = (remainder << 1) ^ POLYNOMIAL;
+            }
+            else
+            {
+                remainder = (remainder << 1);
+            }
+        }
+
+        /*
+         * Store the result into the table.
+         */
+        crcTable[dividend] = remainder;
+    }
+
+}   /* crcInit() */
+
+
+/*********************************************************************
+ *
+ * Function:    crcFast()
+ * 
+ * Description: Compute the CRC of a given message.
+ *
+ * Notes:		crcInit() must be called first.
+ *
+ * Returns:		The CRC of the message.
+ *
+ *********************************************************************/
+crc
+crcFast(unsigned char const message[], int nBytes)
+{
+    crc	           remainder = INITIAL_REMAINDER;
+    unsigned char  data;
+	int            byte;
+
+
+    /*
+     * Divide the message by the polynomial, a byte at a time.
+     */
+    for (byte = 0; byte < nBytes; ++byte)
+    {
+        data = REFLECT_DATA(message[byte]) ^ (remainder >> (WIDTH - 8));
+  		remainder = crcTable[data] ^ (remainder << 8);
+    }
+
+    /*
+     * The final remainder is the CRC.
+     */
+    return (REFLECT_REMAINDER(remainder) ^ FINAL_XOR_VALUE);
+
+}   /* crcFast() */
+

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/hal/TARGET_Freescale/TARGET_KPSDK_MCUS/TARGET_MCU_K64F/TARGET_FRDM/crc.h	Wed Jul 08 07:45:08 2015 +0100
@@ -0,0 +1,77 @@
+/**********************************************************************
+ *
+ * Filename:    crc.h
+ * 
+ * Description: A header file describing the various CRC standards.
+ *
+ * Notes:       
+ *
+ * 
+ * Copyright (c) 2000 by Michael Barr.  This software is placed into
+ * the public domain and may be used for any purpose.  However, this
+ * notice must not be changed or removed and no warranty is either
+ * expressed or implied by its publication or distribution.
+ **********************************************************************/
+
+#ifndef _crc_h
+#define _crc_h
+
+
+#define FALSE	0
+#define TRUE	!FALSE
+
+/*
+ * Select the CRC standard from the list that follows.
+ */
+#define CRC16
+
+
+#if defined(CRC_CCITT)
+
+typedef unsigned short  crc;
+
+#define CRC_NAME			"CRC-CCITT"
+#define POLYNOMIAL			0x1021
+#define INITIAL_REMAINDER	0xFFFF
+#define FINAL_XOR_VALUE		0x0000
+#define REFLECT_DATA		FALSE
+#define REFLECT_REMAINDER	FALSE
+#define CHECK_VALUE			0x29B1
+
+#elif defined(CRC16)
+
+typedef unsigned short  crc;
+
+#define CRC_NAME			"CRC-16"
+#define POLYNOMIAL			0x8005
+#define INITIAL_REMAINDER	0x0000
+#define FINAL_XOR_VALUE		0x0000
+#define REFLECT_DATA		TRUE
+#define REFLECT_REMAINDER	TRUE
+#define CHECK_VALUE			0xBB3D
+
+#elif defined(CRC32)
+
+typedef unsigned long  crc;
+
+#define CRC_NAME			"CRC-32"
+#define POLYNOMIAL			0x04C11DB7
+#define INITIAL_REMAINDER	0xFFFFFFFF
+#define FINAL_XOR_VALUE		0xFFFFFFFF
+#define REFLECT_DATA		TRUE
+#define REFLECT_REMAINDER	TRUE
+#define CHECK_VALUE			0xCBF43926
+
+#else
+
+#error "One of CRC_CCITT, CRC16, or CRC32 must be #define'd."
+
+#endif
+
+
+void  crcInit(void);
+crc   crcSlow(unsigned char const message[], int nBytes);
+crc   crcFast(unsigned char const message[], int nBytes);
+
+
+#endif /* _crc_h */

--- a/targets/hal/TARGET_Freescale/TARGET_KPSDK_MCUS/TARGET_MCU_K64F/TARGET_FRDM/mbed_overrides.c	Mon Jul 06 09:15:09 2015 +0100
+++ b/targets/hal/TARGET_Freescale/TARGET_KPSDK_MCUS/TARGET_MCU_K64F/TARGET_FRDM/mbed_overrides.c	Wed Jul 08 07:45:08 2015 +0100
@@ -15,6 +15,9 @@
  */
 #include "gpio_api.h"
 
+#define CRC16
+#include "crc.h"
+
 // called before main - implement here if board needs it ortherwise, let
 //  the application override this if necessary
 //void mbed_sdk_init()
@@ -34,21 +37,36 @@
 // Provide ethernet devices with a semi-unique MAC address from the UUID
 void mbed_mac_address(char *mac)
 {
-    // Fetch word 0
-    uint32_t word0 = *(uint32_t *)0x40048060;
-    // Fetch word 1
-    // we only want bottom 16 bits of word1 (MAC bits 32-47)
-    // and bit 1 forced to 1, bit 0 forced to 0
-    // Locally administered MAC, reduced conflicts
+    
+    unsigned int UUID_LOC_BASE = 0x40048054;    // First adddress of the 4-word UUID
+    char uuid[16];                              // So we can take a local copy of the UUID
+    uint32_t MAC[3]; // 3 16 bits words for the MAC
+
+    // copy the UUID to the variable MAC[]
+    memcpy(uuid,(const void*)UUID_LOC_BASE,sizeof(uuid));    
+    
+    // generate three CRC16's using different slices of the UUID
+    MAC[0] = crcSlow(uuid, 8);   // most significant half-word
+    MAC[1] = crcSlow(uuid, 12); 
+    MAC[2] = crcSlow(uuid, 16); // least significant half word
+        
+    // The network stack expects an array of 6 bytes
+    // so we copy, and shift and copy from the half-word array to the byte array
+    mac[0] = MAC[0] >> 8;
+    mac[1] = MAC[0];
+    mac[2] = MAC[1] >> 8;
+    mac[3] = MAC[1];
+    mac[4] = MAC[2] >> 8;
+    mac[5] = MAC[2];
+
+    // We want to force bits [1:0] of the most significant byte [0]
+    // to be "10" 
     // http://en.wikipedia.org/wiki/MAC_address
-    uint32_t word1 = *(uint32_t *)0x4004805C;
-    word1 |= 0x00000002;
-    word1 &= 0x0000FFFE;
-    
-    mac[0] = (word1 & 0x000000ff);
-    mac[1] = (word1 & 0x0000ff00) >> 8;
-    mac[2] = (word0 & 0xff000000) >> 24;
-    mac[3] = (word0 & 0x00ff0000) >> 16;
-    mac[4] = (word0 & 0x0000ff00) >> 8;
-    mac[5] = (word0 & 0x000000ff);
+
+    mac[0] |= 0x02; // force bit 1 to a "1" = "Locally Administered"
+    mac[0] &= 0xFE; // force bit 0 to a "0" = Unicast
+
 }
+
+
+