iot2050-event-record: Make sensors' threshold configurable

Currently it is impossible to get the precise threshold values for
tilting and uncovering threshold, make sensors' threshold values
configurable.

Signed-off-by: Li Hua Qian <[email protected]>

recipes-app/iot2050-event-record/README.md

@@ -36,6 +36,8 @@ as follows:
 ```sh
 cp /usr/lib/iot2050/event/iot2050-event-record.conf /etc/systemd/system/iot2050-event-record.service.d/
 ```
+If changing the tilting threshold and uncovering threshold is expected, please
+refer to the ``iot2050-event-record.conf`` for the details.
 
 ### Watchdog events
 

recipes-app/iot2050-event-record/files/iot2050-event-record.conf

@@ -1,6 +1,12 @@
 # In IoT2050-SM, there are sensors for tilted and uncovered detection. If you
 # want to enable logging of sensor events, i.e. tilted and uncovered events.
 # Please copy this file to /etc/systemd/system/iot2050-event-record.service.d/.
+#
+# RECORD_SENSOR_EVENTS: to start sensor event recording.
+# ACCEL_CRITICAL_VALUE: to define the tilting threshold.
+# LUX_CRITICAL_VALUE: to define the uncovering threshold.
 
 [Service]
 Environment="RECORD_SENSOR_EVENTS=True"
+Environment="ACCEL_CRITICAL_VALUE=1000"
+Environment="LUX_CRITICAL_VALUE=100"

recipes-app/iot2050-event-record/files/iot2050-event-record.py

@@ -130,8 +130,6 @@ def record_eio_events():
 
 IIO_IMU_PATH = "/sys/devices/platform/bus@100000/2030000.i2c/i2c-5/5-006a/"
 IIO_PRO_PATH = "/sys/devices/platform/bus@100000/2030000.i2c/i2c-5/5-0044/"
-ACCEL_CRITICAL_VALUE = 1000
-LUX_CRITICAL_VALUE = 300
 def record_sensor_events():
     accel_x_raw = "{}/in_accel_x_raw"
     accel_y_raw = "{}/in_accel_y_raw"
@@ -154,6 +152,8 @@ def record_sensor_events():
         open(accel_z_raw, 'r') as z, \
         open(pro_raw, 'r') as l:
         is_uncovered = False
+        accel_critical_value = int(os.getenv('ACCEL_CRITICAL_VALUE'))
+        lux_critical_value = int(os.getenv('LUX_CRITICAL_VALUE'))
         while True:
             # Detect tilt sensor event
             x.seek(0)
@@ -168,22 +168,22 @@ def record_sensor_events():
             x.seek(0)
             y.seek(0)
             z.seek(0)
-            if abs(int(x.read()) - old_x) > ACCEL_CRITICAL_VALUE or \
-                abs(int(y.read()) - old_y) > ACCEL_CRITICAL_VALUE or \
-                abs(int(z.read()) - old_z) > ACCEL_CRITICAL_VALUE:
+            if abs(int(x.read()) - old_x) > accel_critical_value or \
+                abs(int(y.read()) - old_y) > accel_critical_value or \
+                abs(int(z.read()) - old_z) > accel_critical_value:
                 now = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
                 tilted_event = EVENT_STRINGS["tilt"].format(now)
                 write_event(EVENT_TYPES["tilt"], tilted_event)
 
             # Detect tamper sensor event
             l.seek(0)
             lux = int(l.read())
-            if lux < LUX_CRITICAL_VALUE and not is_uncovered:
+            if lux < lux_critical_value and not is_uncovered:
                 is_uncovered = True
                 now = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
                 uncover_event = EVENT_STRINGS["uncover"].format(now)
                 write_event(EVENT_TYPES["uncover"], uncover_event)
-            elif lux > LUX_CRITICAL_VALUE and is_uncovered:
+            elif lux > lux_critical_value and is_uncovered:
                 is_uncovered = False
 
 def event_record():