tools: hrs2csv: Add a simple parser for hrs.data files

Signed-off-by: Daniel Thompson <daniel@redfelineninja.org.uk>

tools/hrs2csv.py

@@ -0,0 +1,38 @@
+#!/usr/bin/env python3
+
+# SPDX-License-Identifier: LGPL-3.0-or-later
+# Copyright (C) 2021 Daniel Thompson
+
+import sys
+
+def parse_record(view):
+    '''Consume a single set of samples and format as a line for a CSV file.'''
+    # Verify synchronization
+    assert(view[0] == 0xffff)
+
+    # Extract the timestamp and format it in ISO 8601 format
+    (YY, MM, DD, hh, mm, ss) = view[1:7]
+    print(f'"{YY:04}{MM:02}{DD:02}T{hh:02}{mm:02}{ss:02}"', end='')
+
+    # Consume data until we reach the synchronization token
+    offset = 8
+    while offset < len(view) and view[offset] != 0xffff:
+        print(f',{view[offset]}', end='')
+        offset += 1
+
+    # Close the current record and return
+    print('')
+    return offset
+
+# Open and read the file named in our first argument
+with open(sys.argv[1], 'rb') as f:
+    rawdata = f.read()
+
+# Re-interpret the raw data as an array of 16-bit values
+view = memoryview(rawdata)
+data = view.cast('H')
+
+# Process the data one record at a time
+offset = 0
+while offset < len(data):
+    offset += parse_record(data[offset:])