Merge pull request #2 from adafruit/master

Sync from upstream

Author: dplanella

Adafruit_BBIO/Encoder.py

@@ -7,7 +7,8 @@
 import sysfs
 import platform
 
-if not platform.release().startswith('4.4'):
+(major, minor, patch) = platform.release().split("-")[0].split(".")
+if not (int(major) >= 4 and int(minor) >=  4):
     raise ImportError(
         'The Encoder module requires Linux kernel version >= 4.4.x.\n'
         'Please upgrade your kernel to use this module.\n'

README.md

@@ -39,6 +39,22 @@ sudo pip install --upgrade Adafruit_BBIO
 
 Using the library is very similar to the excellent RPi.GPIO library used on the Raspberry Pi. Below are some examples.
 
+### Pin Numbers
+
+Please note that there is no '0' prefix for the pin numbers.  For example, pin 7 on header P8 is `P8_7`.
+
+**Correct:**
+```
+GPIO.setup("P8_7", OUT )
+```
+
+**INCORRECT:**
+```
+GPIO.setup("P8_07", OUT )
+```
+
+Refer to `pins_t table[]` in [common.c](https://github.com/adafruit/adafruit-beaglebone-io-python/blob/master/source/common.c#L73) all the pin labels.
+
 ### config-pin
 
 [config-pin](https://github.com/beagleboard/bb.org-overlays/tree/master/tools/beaglebone-universal-io) is now used on the official BeagleBoard.org Debian Jessie and Stretch images to control pin mode (e.g. pin mux).

source/py_pwm.c

@@ -217,8 +217,8 @@ static const char moduledocstring[] = "PWM functionality of a BeagleBone using P
 PyMethodDef pwm_methods[] = {
     {"start", (PyCFunction)py_start_channel, METH_VARARGS | METH_KEYWORDS, "Set up and start the PWM channel.  channel can be in the form of 'P8_10', or 'EHRPWM2A'"},
     {"stop", (PyCFunction)py_stop_channel, METH_VARARGS | METH_KEYWORDS, "Stop the PWM channel.  channel can be in the form of 'P8_10', or 'EHRPWM2A'"},
-    { "set_duty_cycle", (PyCFunction)py_set_duty_cycle, METH_VARARGS, "Change the duty cycle\ndutycycle - between 0.0 and 100.0" },
-    { "set_frequency", (PyCFunction)py_set_frequency, METH_VARARGS, "Change the frequency\nfrequency - frequency in Hz (freq > 0.0)" },
+    { "set_duty_cycle", (PyCFunction)py_set_duty_cycle, METH_VARARGS | METH_KEYWORDS, "Change the duty cycle\ndutycycle - between 0.0 and 100.0" },
+    { "set_frequency", (PyCFunction)py_set_frequency, METH_VARARGS | METH_KEYWORDS, "Change the frequency\nfrequency - frequency in Hz (freq > 0.0)" },
     {"cleanup", py_cleanup, METH_VARARGS, "Clean up by resetting all GPIO channels that have been used by this program to INPUT with no pullup/pulldown and no event detection"},
     //{"setwarnings", py_setwarnings, METH_VARARGS, "Enable or disable warning messages"},
     {NULL, NULL, 0, NULL}