1 files changed, 94 insertions, 0 deletions
diff --git a/src/lib/gsm_constants.h b/src/lib/gsm_constants.h
new file mode 100644
index 0000000..01dfb22
--- /dev/null
+++ b/src/lib/gsm_constants.h
@@ -0,0 +1,94 @@
+#ifndef INCLUDED_GSM_CONSTANTS_H
+#define INCLUDED_GSM_CONSTANTS_H
+
+#define GSM_SYMBOL_RATE  (1625000.0/6.0) //symbols per second
+#define GSM_SYMBOL_PERIOD (1.0/GSM_SYMBOL_RATE) //seconds per symbol
+
+//Burst timing
+#define TAIL_BITS         3
+#define GUARD_BITS        8    //8.25
+#define DATA_BITS         58   //size of 1 data block in normal burst
+#define N_TRAIN_BITS      26
+#define N_SYNC_BITS       64
+#define USEFUL_BITS       142  //(2*DATA_BITS + N_TRAIN_BITS )
+#define FCCH_BITS         USEFUL_BITS
+
+#define TS_BITS           (TAIL_BITS+USEFUL_BITS+TAIL_BITS+GUARD_BITS)  //a full TS (156)
+#define TS_PER_FRAME      8
+#define FRAME_BITS        (TS_PER_FRAME * TS_BITS + 2) // +2 for extra 8*0.25 guard bits
+#define FCCH_POS          TAIL_BITS
+#define SYNC_POS          39
+#define TRAIN_POS         58
+
+#define FCCH_HITS_NEEDED        (USEFUL_BITS - 4) 
+#define FCCH_MAX_MISSES         2
+
+static const int SYNC_BITS[] = {
+  1, 0, 1, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 0, 1, 0,
+  0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1,
+  0, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1,
+  0, 1, 1, 1, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 1, 1
+};
+
+// Sync             : .+...++.+..+++.++++++.++++++....++.+..+.+.+++.+.+...+..++++..+..
+// Diff Encoded Sync: .++..+.+++.+..++.....++.....+...+.+++.+++++..+++++..++.+...+.++.
+
+#define TSC0  0
+#define TSC1  1
+#define TSC2  2
+#define TSC3  3
+#define TSC4  4
+#define TSC5  5
+#define TSC6  6
+#define TSC7  7
+#define TS_FCCH  8
+#define TS_DUMMY 9
+
+static const unsigned char train_seq[10][N_TRAIN_BITS] = {
+  {0, 0, 1, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 1, 1, 1},
+  {0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, 1, 0, 1, 1, 1},
+  {0, 1, 0, 0, 0, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 0, 1, 0, 0, 0, 0, 1, 1, 1, 0},
+  {0, 1, 0, 0, 0, 1, 1, 1, 1, 0, 1, 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 1, 0},
+  {0, 0, 0, 1, 1, 0, 1, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 1, 0, 1, 0, 1, 1},
+  {0, 1, 0, 0, 1, 1, 1, 0, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 0, 1, 0},
+  {1, 0, 1, 0, 0, 1, 1, 1, 1, 1, 0, 1, 1, 0, 0, 0, 1, 0, 1, 0, 0, 1, 1, 1, 1, 1},
+  {1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0},
+  {1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}, //#9 FCCH ;-)
+  {0, 1, 1, 1, 0, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0, 1, 0, 1} // DUMMY
+};
+
+//Dummy burst 0xFB 76 0A 4E 09 10 1F 1C 5C 5C 57 4A 33 39 E9 F1 2F A8
+static const unsigned char dummy_burst[] = {
+  1, 1, 1, 1, 1, 0, 1, 1, 0, 1,
+  1, 1, 0, 1, 1, 0, 0, 0, 0, 0,
+  1, 0, 1, 0, 0, 1, 0, 0, 1, 1,
+  1, 0, 0, 0, 0, 0, 1, 0, 0, 1,
+  0, 0, 0, 1, 0, 0, 0, 0, 0, 0,
+  0, 1, 1, 1, 1, 1, 0, 0,
+
+  0, 1, 1, 1, 0, 0, 0, 1, 0, 1,
+  1, 1, 0, 0, 0, 1, 0, 1, 1, 1,
+  0, 0, 0, 1, 0, 1,
+
+  0, 1, 1, 1, 0, 1, 0, 0, 1, 0,
+  1, 0, 0, 0, 1, 1, 0, 0, 1, 1,
+  0, 0, 1, 1, 1, 0, 0, 1, 1, 1,
+  1, 0, 1, 0, 0, 1, 1, 1, 1, 1,
+  0, 0, 0, 1, 0, 0, 1, 0, 1, 1,
+  1, 1, 1, 0, 1, 0, 1, 0
+};
+
+//Diff encoded train_seq
+//TSC0: +.++.+++..+...++..++.+++..
+//TSC1: +.+++.++..++...+..++.+++..
+//TSC2: +++...+..++..+++.++...+..+
+//TSC3: +++..+...++.+++..++..+...+
+//TSC4: +..+.++++..+.++....+.++++.
+//TSC5: +++.+..++++.+....++.+..+++
+//TSC6: .+++.+....++.+..++++.+....
+//TSC7: ...++...+..++.+++..++...+.
+//TSC8: ..........................
+//TSC9: ++..+..+++..+..+++..+..+++
+
+
+#endif /* INCLUDED_GSM_CONSTANTS_H */