co: add wrapper

Signed-off-by: Francois Berder <[email protected]>
Signed-off-by: Francois Berder <[email protected]>

Author: francois-berder

letmecreate/click/__init__.py

@@ -7,6 +7,7 @@
   - ADC
   - Alcohol
   - Bargraph
+  - CO
   - Color
   - Color2
   - Eve
@@ -23,4 +24,5 @@
 
 __all__ = ['seven_seg', 'led_matrix', 'accel', 'adc', 'alcohol', 'bargraph',
            'color', 'color2', 'eve', 'ir_distance', 'ir_eclipse', 'joystick',
-           'motion', 'proximity', 'relay', 'relay2', 'relay4', 'thermo3']
+           'motion', 'proximity', 'relay', 'relay2', 'relay4', 'thermo3',
+           'CO']

letmecreate/click/co.py

@@ -0,0 +1,20 @@
+#!/usr/bin/env python3
+"""Python binding of CO Click wrapper of LetMeCreate library."""
+
+import ctypes
+
+_LIB = ctypes.CDLL('libletmecreate_click.so')
+
+
+def get_measure(mikrobus_index):
+    """Measure the CO concentration in the air using the CO click.
+
+    mikrobus_index: must be 0 (MIKROBUS_1) or 1 (MIKROBUS_2)
+
+    Note: An exception is thrown if it fails to communicate with the CO click.
+    """
+    value = ctypes.c_uint16_t(0)
+    ret = _LIB.co_click_get_measure(mikrobus_index, ctypes.byref(value))
+    if ret < 0:
+        raise Exception("co click read ppm failed")
+    return value.value