1 files changed, 73 insertions, 0 deletions

diff --git a/glucometerutils/drivers/fslibre.py b/glucometerutils/drivers/fslibre.py
new file mode 100644
index 0000000..c213ccd
--- /dev/null
+++ b/glucometerutils/drivers/fslibre.py
@@ -0,0 +1,73 @@
+# -*- coding: utf-8 -*-
+"""Driver for FreeStyle Libre CGM devices."""
+
+__author__ = 'Diego Elio Pettenò'
+__email__ = 'flameeyes@flameeyes.eu'
+__copyright__ = 'Copyright © 2017, Diego Elio Pettenò'
+__license__ = 'MIT'
+
+import datetime
+
+from glucometerutils import common
+from glucometerutils.support import freestyle
+
+# Fields of the records returned by $history?
+# Tuple of pairs of idx and field name
+_HISTORY_ENTRY_MAP = (
+    (2, 'month'),
+    (3, 'day'),
+    (4, 'year'),  # 2-digits
+    (5, 'hour'),
+    (6, 'minute'),
+    (7, 'second'),
+    (13, 'value'),
+    (15, 'errors'),
+)
+
+
+class Device(freestyle.FreeStyleHidDevice):
+    """Glucometer driver for FreeStyle Libre devices."""
+
+    def get_meter_info(self):
+        """Return the device information in structured form."""
+        return common.MeterInfo(
+            'FreeStyle Libre',
+            serial_number=self.get_serial_number(),
+            version_info=(
+                'Software version: ' + self._get_version(),),
+            native_unit=self.get_glucose_unit())
+
+    def get_serial_number(self):
+        """Overridden function as the command is not compatible."""
+        return self._send_text_command(b'$sn?').rstrip('\r\n')
+
+    def get_glucose_unit(self):
+        """Returns the glucose unit of the device."""
+        # TODO(Flameeyes): figure out how to identify the actual unit on the
+        # device.
+        return common.UNIT_MGDL
+
+    def get_readings(self):
+        for record in self._get_multirecord(b'$history?'):
+            if not record:
+                continue
+
+            parsed_record = {
+                key: int(record[idx])
+                for idx, key in _HISTORY_ENTRY_MAP
+            }
+
+            if parsed_record['errors'] != 0:
+                # The reading is considered invalid, so ignore it.
+                continue
+
+            timestamp = datetime.datetime(
+                parsed_record['year'] + 2000,
+                parsed_record['month'],
+                parsed_record['day'],
+                parsed_record['hour'],
+                parsed_record['minute'],
+                parsed_record['second'])
+
+            yield common.Reading(timestamp, parsed_record['value'],
+                                 comment='(Sensor)')