initial working MCP2221

[Adafruit_Blinka-hackapet.git] / src / analogio.py

diff --git a/src/analogio.py b/src/analogio.py
new file mode 100644 (file)
index 0000000..229495d
--- /dev/null
+++ b/src/analogio.py
@@ -0,0 +1,52 @@
+"""
+`analogio` - Analog input and output control
+=================================================
+See `CircuitPython:analogio` in CircuitPython for more details.
+* Author(s): Carter Nelson
+"""
+
+from adafruit_blinka.agnostic import board_id, detector
+
+# pylint: disable=ungrouped-imports,wrong-import-position
+
+if detector.board.microchip_mcp2221:
+    from adafruit_blinka.microcontroller.mcp2221.pin import Pin
+else:
+    raise NotImplementedError("analogio not supported for this board.")
+
+from adafruit_blinka import ContextManaged
+
+class AnalogIn(ContextManaged):
+
+    def __init__(self, pin):
+        self._pin = Pin(pin.id)
+        self._pin.init(mode=Pin.ADC)
+
+    @property
+    def value(self):
+        return self._pin.value()
+
+    @value.setter
+    def value(self, value):
+        # emulate what CircuitPython does
+        raise AttributeError("'AnalogIn' object has no attribute 'value'")
+
+    def deinit(self):
+        del self._pin
+
+class AnalogOut(ContextManaged):
+    def __init__(self, pin):
+        self._pin = Pin(pin.id)
+        self._pin.init(mode=Pin.DAC)
+
+    @property
+    def value(self):
+        # emulate what CircuitPython does
+        raise AttributeError("unreadable attribute")
+
+    @value.setter
+    def value(self, value):
+        self._pin.value(value)
+
+    def deinit(self):
+        del self._pin
\ No newline at end of file