examples: Python MCP3004 ADC example (use with MinnowMax Calamari lure)

Signed-off-by: Henry Bruce <henry.bruce@intel.com>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

examples/python/mcp3004.py

@@ -0,0 +1,40 @@
+#!/usr/bin/env python
+
+# Author: Henry Bruce <henry.bruce@intel.com>
+# Copyright (c) 2016 Intel Corporation.
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE
+
+# Read from MCP3004 ADC pin 0 in single ended mode
+import mraa
+import time
+
+dev = mraa.Spi(0)
+txbuf = bytearray(3)
+txbuf[0] = 0x01
+txbuf[1] = 0x80
+txbuf[2] = 0x00
+
+while True:
+    rxbuf = dev.write(txbuf)
+    value = ((rxbuf[1] & 0x03) << 8) | rxbuf[2]
+    print value
+    time.sleep(0.5)
+