Prototype 'version blob' python script to generate a binary description file to append to end of firmware before uploading.

flight/Project/versionblob.py

@@ -0,0 +1,65 @@
+#!/usr/bin/env python
+
+#  Generate a version blob for
+# the OpenPilot firmware.
+#
+# We have 100 bytes for the whole description.
+#
+# Only the first 40 are used by the firmware, the remaining
+# 60 are ok to use for packaging and will be saved in the flash
+#
+# Structure is:
+#  4 bytes: header: "OpFw"
+#  4 bytes: GIT commit tag (short version of SHA1)
+#  4 bytes: Unix timestamp of compile time
+#  2 bytes: target platform. Should follow same rule as BOARD_TYPE and BOARD_REVISION in board define files.
+#  26 bytes: commit tag if it is there, otherwise "Unreleased". Zero-padded
+#   ---- 40 bytes limit ---
+#  20 bytes: SHA1 sum of the firmware.
+
+import binascii
+import os
+from time import time
+
+file = open("test.bin","wb")
+# Write the magic value:
+file.write("OpFw")
+# Get the short commit tag of the current git repository.
+# Strip it to 8 characters for a 4 byte (int32) value.
+# We have no full guarantee of unicity, but it is good enough
+# with the rest of the information in the structure.
+hs= os.popen('git rev-parse --short=8 HEAD').read().strip()
+print "Version: " + hs
+hb=binascii.a2b_hex(hs)
+file.write(hb)
+# Then the Unix time into a 32 bit integer:
+print "Date: "  + hex(int(time())).lstrip('0x')
+hb = binascii.a2b_hex(hex(int(time())).lstrip('0x'))
+file.write(hb)
+
+# Then write board type and board revision
+hb = binascii.a2b_hex("0401") # CopterControl revision 1
+file.write(hb)
+
+# Last: a user-friendly description if it exists in GIT, otherwise
+# just "unreleased"
+hs = os.popen('git describe --exact-match').read()
+if len(hs) == 0 :
+	print "Unreleased: get branch name instead"
+	hs = os.popen('git branch --contains HEAD').read()
+
+file.write(hs[0:25])
+file.write("\0"*(26-len(hs)))
+
+## Now we are at the 40 bytes mark.
+
+## Add the 20 byte SHA1 hash of the firmware:
+import hashlib
+sha1 = hashlib.sha1()
+with open('build/coptercontrol/CopterControl.bin','rb') as f: 
+    for chunk in iter(lambda: f.read(8192), ''): 
+         sha1.update(chunk)
+file.write(sha1.digest())
+
+file.close()
+