From 5d0f656e3d609a4004093c1856309f776740d610 Mon Sep 17 00:00:00 2001
From: Cort Buffington <n0mjs@me.com>
Date: Fri, 30 Sep 2016 14:16:53 -0500
Subject: [PATCH] Initial Upload

---
 const.py |  8 ++++++++
 crc.py   | 42 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 50 insertions(+)
 create mode 100644 const.py
 create mode 100755 crc.py

diff --git a/const.py b/const.py
new file mode 100644
index 0000000..8079392
--- /dev/null
+++ b/const.py
@@ -0,0 +1,8 @@
+BS_VOICE_SYNC = '\x75\x5F\xD7\xDF\x75\xF7'
+BS_DATA_SYNC  = '\xDF\xF5\x7D\x75\xDF\x5D'
+
+'''
+EMB: CC(4b), PI(1b), LCSS(2b), EMB Parity(9b - QR 16,7,5)
+Slot Type: CC(4b), DataType(4), Slot Type Parity(12b - )
+
+'''
\ No newline at end of file
diff --git a/crc.py b/crc.py
new file mode 100755
index 0000000..18e0d05
--- /dev/null
+++ b/crc.py
@@ -0,0 +1,42 @@
+#!/usr/bin/env python
+#
+# This work is licensed under the Creative Attribution-NonCommercial-ShareAlike
+# 3.0 Unported License.To view a copy of this license, visit
+# http://creativecommons.org/licenses/by-nc-sa/3.0/ or send a letter to
+# Creative Commons, 444 Castro Street, Suite 900, Mountain View,
+# California, 94041, USA.
+
+from __future__ import print_function
+from bitarray import bitarray
+
+# Does anybody read this stuff? There's a PEP somewhere that says I should do this.
+__author__     = 'Cortney T. Buffington, N0MJS'
+__copyright__  = 'Copyright (c) 2016 Cortney T. Buffington, N0MJS and the K0USY Group'
+__credits__    = 'Jonathan Naylor, G4KLX'
+__license__    = 'Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported'
+__maintainer__ = 'Cort Buffington, N0MJS'
+__email__      = 'n0mjs@me.com'
+
+
+def csum5(_data):
+    _data = bytearray(_data)
+    accum = 0
+    assert len(_data) == 9, 'csum5 expected 9 bytes of data and got something else'
+    for i in xrange(9):
+        accum += _data[i]
+    accum = chr(accum % 31)
+    csum = bitarray()
+    csum.frombytes(accum)
+    del csum[0:3]
+    return csum
+
+ 
+    
+
+if __name__ == '__main__':
+    from binascii import b2a_hex as h
+    
+    message = '\x00\x10\x20\x00\x0c\x30\x2f\x9b\xe5'
+    
+    result = csum5(message)
+    print(result, type(result))
\ No newline at end of file