first commit

Software/Python/grove_i2c_touch/touchtest.py

@@ -0,0 +1,77 @@
+# Copyright (c) 2014 Adafruit Industries
+# Author: Tony DiCola
+#
+# 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.
+import sys
+import time
+
+import MPR121 
+
+
+print('MPR121 Capacitive Touch Sensor Test')
+
+# Create MPR121 instance.
+cap = MPR121.MPR121()
+
+# Initialize communication with MPR121 using default I2C bus of device, and 
+# default I2C address (0x5A).  On BeagleBone Black will default to I2C bus 0.
+if not cap.begin():
+    print('Error initializing MPR121.  Check your wiring!')
+    sys.exit(1)
+
+# Alternatively, specify a custom I2C address such as 0x5B (ADDR tied to 3.3V),
+# 0x5C (ADDR tied to SDA), or 0x5D (ADDR tied to SCL).
+#cap.begin(address=0x5B)
+
+# Also you can specify an optional I2C bus with the bus keyword parameter.
+#cap.begin(bus=1)
+
+# Main loop to print a message every time a pin is touched.
+print('Press Ctrl-C to quit.')
+last_touched = cap.touched()
+while True:
+    current_touched = cap.touched()
+    # Check each pin's last and current state to see if it was pressed or released.
+    for i in range(12):
+        # Each pin is represented by a bit in the touched value.  A value of 1
+        # means the pin is being touched, and 0 means it is not being touched.
+        pin_bit = 1 << i
+        # First check if transitioned from not touched to touched.
+        if current_touched & pin_bit and not last_touched & pin_bit:
+            print('{0} touched!'.format(i))
+        # Next check if transitioned from touched to not touched.
+        if not current_touched & pin_bit and last_touched & pin_bit:
+            print('{0} released!'.format(i))
+    # Update last state and wait a short period before repeating.
+    last_touched = current_touched
+    time.sleep(0.1)
+
+    # Alternatively, if you only care about checking one or a few pins you can 
+    # call the is_touched method with a pin number to directly check that pin.
+    # This will be a little slower than the above code for checking a lot of pins.
+    #if cap.is_touched(0):
+    #    print 'Pin 0 is being touched!'
+    
+    # If you're curious or want to see debug info for each pin, uncomment the
+    # following lines:
+    #print '\t\t\t\t\t\t\t\t\t\t\t\t\t 0x{0:0X}'.format(cap.touched())
+    #filtered = [cap.filtered_data(i) for i in range(12)]
+    #print 'Filt:', '\t'.join(map(str, filtered))
+    #base = [cap.baseline_data(i) for i in range(12)]
+    #print 'Base:', '\t'.join(map(str, base))