Diff: SnUIDtoMac.cpp

Revision:

116:8099b754fbb4

Child:

117:fd6798ba2e26

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SnUIDtoMac.cpp	Tue May 03 02:01:35 2016 +0000
@@ -0,0 +1,125 @@
+#include "SnUIDtoMac.h"
+
+#include "SnCRCUtils.h"
+#include "SnConstants.h"
+
+void SnUIDtoMac::GetMacAddress( char mac[SnUIDtoMac::kNumMacBytes] ) {
+    // this first gets the UID of the ARM chip (LPC1768)
+    // it then tries to see if the UID is in the lookup table of known MAC addresses
+    // (the lookup table is found in GetMacFromUIDtable)
+    // if not, it constructs a fake MAC address given the UID (see GetMacFromCRCofUID)
+    
+    uint32_t uid[SnLPC1768UID::kUIDlen];
+    const bool uidOk = SnLPC1768UID::GetUID(uid);
+    if (uidOk) {
+
+#ifdef DEBUG
+        printf("got UID = %08X %08X %08X %08X\r\n",
+            uid[0], uid[1], uid[2], uid[3]);
+#endif
+        
+        const bool uidInLookupTable = GetMacFromUIDtable(uid, mac);
+        if (uidInLookupTable==false) {
+#ifdef DEBUG
+            printf("UID not in lookup table. Constructing MAC.\r\n");
+#endif
+            GetMacFromCRCofUID(uid, mac);
+        }
+#ifdef DEBUG
+          else {
+            printf("UID found in lookup table.\r\n");
+        }
+#endif
+        
+    } else {
+#ifdef DEBUG
+        printf("mac/uid lookup failed.\r\n");
+#endif    
+        // otherwise we failed. use the default
+        memmove(mac, kDefaultMacAdress, sizeof(kDefaultMacAdress));
+    }
+}
+
+bool SnUIDtoMac::GetMacFromUIDtable(const uint32_t uid[SnLPC1768UID::kUIDlen],
+                                    char mac[kNumMacBytes] ) {
+    
+    if        ( (uid[0]==0x0A015013) && (uid[1]==0xAE2A8CA0) && (uid[2]==0x52B77AA3) && (uid[3]==0xF5001E84) ) {
+        // SST102, stn13
+        mac[0]=0x00; mac[1]=0x02; mac[2]=0xF7; mac[3]=0xF2; mac[4]=0x24; mac[5]=0x4B;
+        return true;
+    } else if ( (uid[0]==0x0A01300B) && (uid[1]==0xAE2A9126) && (uid[2]==0x52B29DC5) && (uid[3]==0xF5001E84) ) {
+        // SST104, stn14
+        mac[0]=0x00; mac[1]=0x02; mac[2]=0xF7; mac[3]=0xF2; mac[4]=0x0A; mac[5]=0x9C;
+        return true;
+    } else if ( (uid[0]==0x0A000002) && (uid[1]==0xAE299840) && (uid[2]==0x52A26AFA) && (uid[3]==0xF5001E82) ) {
+        // SST110, stn15
+        mac[0]=0x00; mac[1]=0x02; mac[2]=0xF7; mac[3]=0xF1; mac[4]=0xF7; mac[5]=0xA8;
+        return true;
+    } else if ( (uid[0]==0x0A000010) && (uid[1]==0xAE2A9126) && (uid[2]==0x52B2A03B) && (uid[3]==0xF5001E80) ) {
+        // SST109, stn17
+        mac[0]=0x00; mac[1]=0x02; mac[2]=0xF7; mac[3]=0xF2; mac[4]=0x02; mac[5]=0xC1;
+        return true;
+    } else if ( (uid[0]==0x0DFFC013) && (uid[1]==0xAE2A9126) && (uid[2]==0x52B2B04A) && (uid[3]==0xF5001E87) ) {
+        // SST111, stn18
+        mac[0]=0x00; mac[1]=0x02; mac[2]=0xF7; mac[3]=0xF2; mac[4]=0x1A; mac[5]=0x8A;
+        return true;
+    } else if ( (uid[0]==0x0E00D01E) && (uid[1]==0xAE2A9126) && (uid[2]==0x52B3DEC1) && (uid[3]==0xF5001E80) ) {
+        // SST105, stn19
+        mac[0]=0x00; mac[1]=0x02; mac[2]=0xF7; mac[3]=0xF2; mac[4]=0x24; mac[5]=0x44;
+        return true;
+    } else if ( (uid[0]==0x17006008) && (uid[1]==0xAE299840) && (uid[2]==0x52A2BD7C) && (uid[3]==0xF5001E80) ) {
+        // SST107, stn31
+        mac[0]=0x00; mac[1]=0x02; mac[2]=0xF7; mac[3]=0xF1; mac[4]=0xF6; mac[5]=0x34;
+        return true;
+    } else if ( (uid[0]==0x12013009) && (uid[1]==0xAE2A8CA7) && (uid[2]==0x52C35FA6) && (uid[3]==0xF5001E85) ) {
+        // SST113, stn30
+        mac[0]=0x00; mac[1]=0x02; mac[2]=0xF7; mac[3]=0xF1; mac[4]=0xF2; mac[5]=0x12;
+        return true;
+    } else if ( (uid[0]==0x1200B00D) && (uid[1]==0xAE2A8CA7) && (uid[2]==0x52C36348) && (uid[3]==0xF5001E84) ) {
+        // SST112, stn32
+        mac[0]=0x00; mac[1]=0x02; mac[2]=0xF7; mac[3]=0xF1; mac[4]=0xF2; mac[5]=0x1A;
+        return true;
+    } else if ( (uid[0]==0x07FFA008) && (uid[1]==0xAE299840) && (uid[2]==0x52A25792) && (uid[3]==0xF5001E87) ) {
+        // SST108, stn16. this mbed doesn't keep time properly. used by engineers for testing.
+        mac[0]=0x00; mac[1]=0x02; mac[2]=0xF7; mac[3]=0xF1; mac[4]=0xE9; mac[5]=0xED;
+        return true;
+    } else if ( (uid[0]==0x0A003002) && (uid[1]==0xAE299840) && (uid[2]==0x52A269C6) && (uid[3]==0xF5001E81) ) {
+        // SST101, bad bias tees - not deployed. here in case this mbed gets put on a different board
+        // or the board is fixed and deployed
+        mac[0]=0x00; mac[1]=0x02; mac[2]=0xF7; mac[3]=0xF1; mac[4]=0xF7; mac[5]=0xC6;
+        return true;
+    } else if ( (uid[0]==0x07010008) && (uid[1]==0xAE299840) && (uid[2]==0x52A25466) && (uid[3]==0xF5001E82) ) {
+        // SST114, bad SST - not deployed. here in case this mbed gets put on a different board
+        mac[0]=0x00; mac[1]=0x02; mac[2]=0xF7; mac[3]=0xF1; mac[4]=0xE9; mac[5]=0xE1;
+        return true;
+    }
+    
+    // not in the "lookup table"
+    return false;
+}
+
+void SnUIDtoMac::GetMacFromCRCofUID(const uint32_t uid[SnLPC1768UID::kUIDlen],
+                                    char mac[kNumMacBytes] ) {
+    // take 2 bytes from the start of the UID and then add on a 32bit CRC of the
+    // while UID in order to get a fake 48bit "mac address"
+    
+    const uint32_t crc = SnCRCUtils::GetCRC32for(uid, SnLPC1768UID::kUIDlen);
+ #ifdef DEBUG
+    printf("Got UID crc = %u\r\n", crc);
+    printf("len=%d, byte=%d\r\n", int(SnLPC1768UID::kUIDlen),
+        int(SnLPC1768UID::kUIDlen*sizeof(char)));
+ #endif
+    union {
+        uint32_t x;
+        char c[sizeof(uint32_t)];
+    } d;
+    d.x = uid[0];
+    mac[0] = d.c[0];
+    mac[1] = d.c[1];
+    d.x = crc;
+    memmove(mac+2, d.c, SnLPC1768UID::kUIDlen*sizeof(char));
+#ifdef DEBUG
+    printf("generated MAC = %02X %02X %02X %02X %02X %02X\r\n",
+        mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
+#endif   
+}
\ No newline at end of file