Added Python 2 / 3 Windows / Linux / Mac OS converter script. So much for cross-platform / version agnostic

Tools/README.txt

@@ -0,0 +1,13 @@
+====== PX4 LOG CONVERSION ======
+
+On each log session (commonly started and stopped by arming and disarming the vehicle) a new file logxxx.bin is created. In many cases there will be only one logfile named log001.bin (only one flight).
+
+There are two conversion scripts in this ZIP file:
+
+logconv.m: This is a MATLAB script which will automatically convert and display the flight data with a GUI. If running this script, the second script can be ignored.
+
+sdlog2_dump.py: This is a Python script (compatible with v2 and v3) which converts the self-describing binary log format to a CSV file. To export a CSV file from within a shell (Windows CMD or BASH on Linux / Mac OS), run:
+
+python sdlog2_dump.py log001.bin -f "export.csv" -t "TIME" -d "," -n ""
+
+Python can be downloaded from http://python.org, but is available as default on Mac OS and Linux.

Tools/sdlog2_dump.py

@@ -1,6 +1,8 @@
 #!/usr/bin/env python
 
-"""Dump binary log generated by sdlog2 or APM as CSV
+from __future__ import print_function
+
+"""Dump binary log generated by PX4's sdlog2 or APM as CSV
     
 Usage: python sdlog2_dump.py <log.bin> [-v] [-e] [-d delimiter] [-n null] [-m MSG[.field1,field2,...]]
     
@@ -21,17 +23,6 @@ __version__ = "1.2"
 
 import struct, sys
 
-from pypreprocessor import pypreprocessor
-
-#exclude
-if sys.version[:3].split('.')[0] == '2':
-    pypreprocessor.defines.append('python2')
-if sys.version[:3].split('.')[0] == '3':
-    pypreprocessor.defines.append('python3')
-
-pypreprocessor.parse()
-#endexclude
-
 class SDLog2Parser:
     BLOCK_SIZE = 8192
     MSG_HEADER_LEN = 3
@@ -76,11 +67,7 @@ class SDLog2Parser:
         self.__msg_descrs = {}      # message descriptions by message type map
         self.__msg_labels = {}      # message labels by message name map
         self.__msg_names = []       # message names in the same order as FORMAT messages
-        #ifdef python2
-        self.__buffer = ""          # buffer, python2
-        #else
-        self.__buffer = bytearray() # buffer for input binary data
-        #endif
+        self.__buffer = "" # buffer for input binary data
         self.__ptr = 0              # read pointer in buffer
         self.__csv_columns = []     # CSV file columns in correct order in format "MSG.label"
         self.__csv_data = {}        # current values for all columns
@@ -129,24 +116,15 @@ class SDLog2Parser:
             self.__buffer = self.__buffer[self.__ptr:] + chunk
             self.__ptr = 0
             while self.__bytesLeft() >= self.MSG_HEADER_LEN:
-                #ifdef python2
                 head1 = ord(self.__buffer[self.__ptr])
                 head2 = ord(self.__buffer[self.__ptr+1])
-                #else
-                head1 = self.__buffer[self.__ptr]
-                head2 = self.__buffer[self.__ptr+1]
-                #endif
                 if (head1 != self.MSG_HEAD1 or head2 != self.MSG_HEAD2):
                     if self.__correct_errors:
                         self.__ptr += 1
                         continue
                     else:
                         raise Exception("Invalid header at %i (0x%X): %02X %02X, must be %02X %02X" % (bytes_read + self.__ptr, bytes_read + self.__ptr, head1, head2, self.MSG_HEAD1, self.MSG_HEAD2))
-                #ifdef python2
                 msg_type = ord(self.__buffer[self.__ptr+2])
-                #else
-                msg_type = self.__buffer[self.__ptr+2]
-                #endif
                 if msg_type == self.MSG_TYPE_FORMAT:
                     # parse FORMAT message
                     if self.__bytesLeft() < self.MSG_FORMAT_PACKET_LEN:
@@ -192,13 +170,9 @@ class SDLog2Parser:
                 self.__csv_columns.append(full_label)
                 self.__csv_data[full_label] = None
         if self.__file != None:
-                print >> self.__file, self.__csv_delim.join(self.__csv_columns)
+                print(self.__csv_delim.join(self.__csv_columns), file=self.__file)
         else:
-                #ifdef python2
-                print self.__csv_delim.join(self.__csv_columns)
-                #else
                 print(self.__csv_delim.join(self.__csv_columns))
-                #endif
 
     def __printCSVRow(self):
         s = []
@@ -211,28 +185,18 @@ class SDLog2Parser:
             s.append(v)
 
         if self.__file != None:
-                print >> self.__file, self.__csv_delim.join(s)
+                print(self.__csv_delim.join(s), file=self.__file)
         else:
-                #ifdef python2
-                print self.__csv_delim.join(s)
-                #else
                 print(self.__csv_delim.join(s))
-                #endif
 
     def __parseMsgDescr(self):
         data = struct.unpack(self.MSG_FORMAT_STRUCT, self.__buffer[self.__ptr + 3 : self.__ptr + self.MSG_FORMAT_PACKET_LEN])
         msg_type = data[0]
         if msg_type != self.MSG_TYPE_FORMAT:
             msg_length = data[1]
-            #ifdef python2
-            msg_name = data[2].strip("\0")
-            msg_format = data[3].strip("\0")
-            msg_labels = data[4].strip("\0").split(",")
-            #else
-            msg_name = str(data[2], 'ascii').strip("\0")
-            msg_format = str(data[3], 'ascii').strip("\0")
-            msg_labels = str(data[4], 'ascii').strip("\0").split(",")
-            #endif
+            msg_name = str(data[2]).strip("\0")
+            msg_format = str(data[3]).strip("\0")
+            msg_labels = str(data[4]).strip("\0").split(",")
             # Convert msg_format to struct.unpack format string
             msg_struct = ""
             msg_mults = []
@@ -249,13 +213,8 @@ class SDLog2Parser:
             self.__msg_names.append(msg_name)
             if self.__debug_out:
                 if self.__filterMsg(msg_name) != None:
-                    #ifdef python2
-                    print "MSG FORMAT: type = %i, length = %i, name = %s, format = %s, labels = %s, struct = %s, mults = %s" % (
-                                msg_type, msg_length, msg_name, msg_format, str(msg_labels), msg_struct, msg_mults)
-                    #else
                     print("MSG FORMAT: type = %i, length = %i, name = %s, format = %s, labels = %s, struct = %s, mults = %s" % (
                                 msg_type, msg_length, msg_name, msg_format, str(msg_labels), msg_struct, msg_mults))
-                    #endif
         self.__ptr += self.MSG_FORMAT_PACKET_LEN
     
     def __parseMsg(self, msg_descr):
@@ -266,11 +225,7 @@ class SDLog2Parser:
         show_fields = self.__filterMsg(msg_name)
         if (show_fields != None):
             data = list(struct.unpack(msg_struct, self.__buffer[self.__ptr+self.MSG_HEADER_LEN:self.__ptr+msg_length]))
-            #ifdef python2
-            for i in xrange(len(data)):
-            #else
             for i in range(len(data)):
-            #endif
                 if type(data[i]) is str:
                     data[i] = data[i].strip("\0")
                 m = msg_mults[i]
@@ -278,26 +233,14 @@ class SDLog2Parser:
                     data[i] = data[i] * m
             if self.__debug_out:
                 s = []
-                #ifdef python2
-                for i in xrange(len(data)):
-                #else
                 for i in range(len(data)):
-                #endif
                     label = msg_labels[i]
                     if show_fields == "*" or label in show_fields:
                         s.append(label + "=" + str(data[i]))
-                #ifdef python2
-                print "MSG %s: %s" % (msg_name, ", ".join(s))
-                #else
                 print("MSG %s: %s" % (msg_name, ", ".join(s)))
-                #endif
             else:
                 # update CSV data buffer
-                #ifdef python2
-                for i in xrange(len(data)):
-                #else
                 for i in range(len(data)):
-                #endif
                     label = msg_labels[i]
                     if label in show_fields:
                         self.__csv_data[msg_name + "_" + label] = data[i]
@@ -309,16 +252,6 @@ class SDLog2Parser:
 
 def _main():
     if len(sys.argv) < 2:
-        #ifdef python2
-        print "Usage: python sdlog2_dump.py <log.bin> [-v] [-e] [-d delimiter] [-n null] [-m MSG[.field1,field2,...]] [-t TIME_MSG_NAME]\n"
-        print "\t-v\tUse plain debug output instead of CSV.\n"
-        print "\t-e\tRecover from errors.\n"
-        print "\t-d\tUse \"delimiter\" in CSV. Default is \",\".\n"
-        print "\t-n\tUse \"null\" as placeholder for empty values in CSV. Default is empty.\n"
-        print "\t-m MSG[.field1,field2,...]\n\t\tDump only messages of specified type, and only specified fields.\n\t\tMultiple -m options allowed."
-        print "\t-t\tSpecify TIME message name to group data messages by time and significantly reduce duplicate output.\n"
-        print "\t-fPrint to file instead of stdout"
-        #else
         print("Usage: python sdlog2_dump.py <log.bin> [-v] [-e] [-d delimiter] [-n null] [-m MSG[.field1,field2,...]] [-t TIME_MSG_NAME]\n")
         print("\t-v\tUse plain debug output instead of CSV.\n")
         print("\t-e\tRecover from errors.\n")
@@ -327,7 +260,6 @@ def _main():
         print("\t-m MSG[.field1,field2,...]\n\t\tDump only messages of specified type, and only specified fields.\n\t\tMultiple -m options allowed.")
         print("\t-t\tSpecify TIME message name to group data messages by time and significantly reduce duplicate output.\n")
         print("\t-fPrint to file instead of stdout")
-        #endif
         return
     fn = sys.argv[1]
     debug_out = False