LRADC support to close out feature #15. Added Utilities to enable and disable the 1.8v pin on U13. Updated README. Updated version to 2.3

CHIP_IO/Utilities.py

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+# Copyright (c) 2016 Robert Wolterman
+#
+# 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.
+
+# CHIP_IO Utilities
+# Random functions to enable fun stuff on the CHIP!
+
+# Credit goes to nonokuono (https://bbs.nextthing.co/users/nonokunono)
+# for gathering the i2cset commands from the AXP-209 datasheet for 2.0, 2.6, and 3.3V output
+# and for figuring out the ADC setup on the AXP-209
+
+import subprocess
+
+# Enable 1.8V Pin on CHIP U13 Header
+def enable_1v8_pin():
+    # CANNOT USE I2C LIB AS WE NEED TO FORCE THE COMMAND DUE TO THE KERNEL OWNING THE DEVICE
+    # First we have to write 0x00 to AXP-209 Register 0x91
+    subprocess.call('/usr/sbin/i2cset -f -y 0 0x34 0x91 0x00', shell=True)
+    # Then we have to write 0x03 to AXP-209 Register 0x90
+    subprocess.call('/usr/sbin/i2cset -f -y 0 0x34 0x90 0x03', shell=True)
+
+# Disable 1.8V Pin on CHIP U13 Header
+def disable_1v8_pin():
+    # CANNOT USE I2C LIB AS WE NEED TO FORCE THE COMMAND DUE TO THE KERNEL OWNING THE DEVICE
+    # First we have to write 0x05 to AXP-209 Register 0x91
+    subprocess.call('/usr/sbin/i2cset -f -y 0 0x34 0x91 0x05', shell=True)
+    # Then we have to write 0x07 to AXP-209 Register 0x90
+    subprocess.call('/usr/sbin/i2cset -f -y 0 0x34 0x90 0x07', shell=True)
+
+# Change 1.8V Pin on CHIP U13 Header to 2.0V
+def change_1v8_pin_to_2v0():
+    # CANNOT USE I2C LIB AS WE NEED TO FORCE THE COMMAND DUE TO THE KERNEL OWNING THE DEVICE
+    # First we have to write 0x20 to AXP-209 Register 0x91
+    subprocess.call('/usr/sbin/i2cset -f -y 0 0x34 0x91 0x20', shell=True)
+    # Then we have to write 0x03 to AXP-209 Register 0x90
+    subprocess.call('/usr/sbin/i2cset -f -y 0 0x34 0x90 0x03', shell=True)
+
+# Change 1.8V Pin on CHIP U13 Header to 2.6V
+def change_1v8_pin_to_2v6():
+    # CANNOT USE I2C LIB AS WE NEED TO FORCE THE COMMAND DUE TO THE KERNEL OWNING THE DEVICE
+    # First we have to write 0x80 to AXP-209 Register 0x91
+    subprocess.call('/usr/sbin/i2cset -f -y 0 0x34 0x91 0x80', shell=True)
+    # Then we have to write 0x03 to AXP-209 Register 0x90
+    subprocess.call('/usr/sbin/i2cset -f -y 0 0x34 0x90 0x03', shell=True)
+
+# Change 1.8V Pin on CHIP U13 Header to 3.3V
+def change_1v8_pin_to_3v3():
+    # CANNOT USE I2C LIB AS WE NEED TO FORCE THE COMMAND DUE TO THE KERNEL OWNING THE DEVICE
+    # First we have to write 0xF0 to AXP-209 Register 0x91
+    subprocess.call('/usr/sbin/i2cset -f -y 0 0x34 0x91 0xF0', shell=True)
+    # Then we have to write 0x03 to AXP-209 Register 0x90
+    subprocess.call('/usr/sbin/i2cset -f -y 0 0x34 0x90 0x03', shell=True)
+
+