Diff: hal/TARGET_FRDM/mbed_overrides.c

Revision:

0:c5e2f793b59a

diff -r 000000000000 -r c5e2f793b59a hal/TARGET_FRDM/mbed_overrides.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hal/TARGET_FRDM/mbed_overrides.c	Wed Mar 23 21:24:48 2016 +0000
@@ -0,0 +1,72 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 ARM Limited
+ *
+ * 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.
+ */
+#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()
+//{
+//
+//}
+
+// Change the NMI pin to an input. This allows NMI pin to 
+//  be used as a low power mode wakeup.  The application will
+//  need to change the pin back to NMI_b or wakeup only occurs once!
+void NMI_Handler(void)
+{
+    gpio_t gpio;
+    gpio_init_in(&gpio, PTA4);
+}
+
+// Provide ethernet devices with a semi-unique MAC address from the UUID
+void mbed_mac_address(char *mac)
+{
+    
+    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
+
+    mac[0] |= 0x02; // force bit 1 to a "1" = "Locally Administered"
+    mac[0] &= 0xFE; // force bit 0 to a "0" = Unicast
+
+}
+
+
+