Added a simple PD Buddy Sink configuration library

LICENSE

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+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
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+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.

README.md

@@ -1,3 +1,41 @@
 # pd-buddy-python
 
-Python library for working with the PD Buddy Sink Serial Console Configuration Interface
+Python library for working with the PD Buddy Sink Serial Console Configuration
+Interface
+
+## Features
+
+* Provides a Pythonic interface to the PD Buddy Sink shell commands
+* Configuration is represented as a SinkConfig object
+* SinkConfig objects can be manipulated locally and written to the device with
+  one method call
+
+## Examples
+
+### Open the first PD Buddy Sink device and read its configuration
+
+    >>> import pdbuddy
+    >>> pdbs = pdbuddy.Sink(list(pdbuddy.Sink.get_devices())[0])
+    >>> pdbs.get_cfg()
+    SinkConfig(status=SinkStatus.VALID, flags=SinkFlags.NONE, v=5000, i=3000)
+
+### Locally manipulate a SinkConfig object
+
+    >>> cfg = pdbs.get_cfg()
+    >>> cfg.v = 20000
+    >>> cfg.i = 2250
+    >>> cfg.flags |= pdbuddy.SinkFlags.GIVEBACK
+    >>> cfg
+    SinkConfig(status=SinkStatus.VALID, flags=SinkFlags.GIVEBACK, v=20000, i=2250)
+
+### Write the SinkConfig object to flash
+
+    >>> pdbs.set_tmpcfg(cfg)
+    >>> pdbs.write()
+    >>> pdbs.get_cfg()
+    SinkConfig(status=SinkStatus.VALID, flags=SinkFlags.GIVEBACK, v=20000, i=2250)
+
+## Requirements
+
+* Python >= 3.4 should work (tested with 3.6)
+* pySerial (tested with 3.3)

pdbuddy/__init__.py

@@ -0,0 +1,268 @@
+"""Python bindings for PD Buddy Sink configuration"""
+
+from enum import *
+
+import serial
+import serial.tools.list_ports
+
+
+class Sink:
+    """Interface for configuring a PD Buddy Sink"""
+    vid = 0x1209
+    pid = 0x0001
+
+    def __init__(self, sp):
+        """Open the serial port to communicate with the PD Buddy Sink
+        
+        Parameters:
+            sp: A serial.tools.list_ports.ListPortInfo object
+        """
+        self.port = serial.Serial(sp.device, baudrate=115200, timeout=0.01)
+
+    def send_command(self, cmd):
+        """Send a command to the PD Buddy Sink, returning the result
+        
+        Parameters:
+            cmd: A string containing the text to send to the Sink
+        
+        Returns:
+            A list of zero or more bytes objects, each being one line printed
+            as a response to the command.
+        """
+        # Send the command
+        self.port.write(bytes(cmd, 'utf-8') + b'\r\n')
+        self.port.flush()
+
+        # Read the result
+        answer = self.port.readlines()
+
+        # Remove the echoed command and prompt
+        answer = answer[1:-1]
+        return answer
+
+    def help(self):
+        """Returns the help text from the PD Buddy Sink"""
+        return self.send_command("help")
+
+    def license(self):
+        """Returns the license text from the PD Buddy Sink"""
+        return self.send_command("license")
+
+    def erase(self):
+        """Synchronously erases all stored configuration from flash"""
+        self.send_command("erase")
+
+    def write(self):
+        """Synchronously writes the contents of the configuration buffer to flash"""
+        self.send_command("write")
+
+    def load(self):
+        """Loads the current configuration from flash into the buffer
+        
+        Raises KeyError if there is no configuration in flash.
+        """
+        text = self.send_command("load")
+        if len(text) > 0 and text[0].startswith(b"No configuration"):
+            raise KeyError("no configuration")
+
+    def get_cfg(self, index=None):
+        """Reads configuration from flash
+         
+        Parameters:
+            index: Optional index of configuration object in flash to read
+
+        Returns:
+            A SinkConfig object
+        """
+        if index is None:
+            cfg = self.send_command("get_cfg")
+        else:
+            cfg = self.send_command("get_cfg {}".format(index))
+
+        return SinkConfig.from_text(cfg)
+
+    def get_tmpcfg(self):
+        """Reads the contents of the configuration buffer
+
+        Returns:
+            A SinkConfig object
+        """
+        cfg = self.send_command("get_tmpcfg")
+
+        return SinkConfig.from_text(cfg)
+
+    def clear_flags(self):
+        """Clears all the flags in the configuration buffer"""
+        self.send_command("clear_flags")
+
+    def toggle_giveback(self):
+        """Toggles the GiveBack flag in the configuration buffer"""
+        self.send_command("toggle_giveback")
+
+    def set_v(self, mv):
+        """Sets the voltage of the configuration buffer, in millivolts"""
+        self.send_command("set_v {}".format(mv))
+
+    def set_i(self, ma):
+        """Sets the current of the configuration buffer, in milliamperes"""
+        self.send_command("set_i {}".format(ma))
+
+    def identify(self):
+        """Blinks the LED quickly"""
+        self.send_command("identify")
+
+    def set_tmpcfg(self, sc):
+        """Writes a SinkConfig object to the device's configuration buffer
+        
+        Note: the value of the status field is ignored; it will always be
+        SinkStatus.VALID.
+        """
+        # Set flags
+        self.clear_flags()
+        if sc.flags & SinkFlags.GIVEBACK:
+            self.toggle_giveback()
+
+        # Set voltage
+        self.set_v(sc.v)
+        
+        # Set current
+        self.set_i(sc.i)
+
+    @classmethod
+    def get_devices(cls):
+        """Get an iterable of PD Buddy Sink devices
+        
+        Returns an iterable of serial.tools.list_ports.ListPortInfo objects.
+        """
+        return serial.tools.list_ports.grep("{:04X}:{:04X}".format(cls.vid,
+            cls.pid))
+
+
+class SinkConfig:
+    """Python representation of a PD Buddy Sink configuration object"""
+
+    def __init__(self, status=None, flags=None, v=None, i=None):
+        """Create a SinkConfig object
+        
+        Parameters:
+            status: A SinkStatus value
+            flags: Zero or more SinkFlags values
+            v: Voltage in millivolts
+            i: Current in milliamperes
+        """
+        self.status = status
+        self.flags = flags
+        self.v = v
+        self.i = i
+
+    def __repr__(self):
+        s = type(self).__name__ + "("
+
+        if self.status is not None:
+            s += "status={}".format(self.status)
+
+        if self.flags is not None:
+            if not s.endswith("("):
+                s += ", "
+            s += "flags={}".format(self.flags)
+
+        if self.v is not None:
+            if not s.endswith("("):
+                s += ", "
+            s += "v={}".format(self.v)
+
+        if self.i is not None:
+            if not s.endswith("("):
+                s += ", "
+            s += "i={}".format(self.i)
+
+        s += ")"
+
+        return s
+
+    def __eq__(self, other):
+        if isinstance(other, self.__class__):
+            if other.status is not self.status:
+                return False
+            if other.flags is not self.flags:
+                return False
+            if other.v != self.v:
+                return False
+            if other.i != self.i:
+                return False
+            return True
+        return NotImplemented
+
+    def __ne__(self, other):
+        if isinstance(other, self.__class__):
+            return not self.__eq__(other)
+        return NotImplemented
+
+    def __hash__(self):
+        return hash(tuple(sorted(self.__dict__.items())))
+
+    @classmethod
+    def from_text(cls, text):
+        """Creates a SinkConfig from text returned by Sink.send_command
+        
+        Returns a new SinkConfig object.
+
+        Raises IndexError if the configuration reads "Invalid index".
+        """
+        # Assume the parameters will all be None
+        status = None
+        flags = None
+        v = None
+        i = None
+
+        # Iterate over all lines of text
+        for line in text:
+            # If the configuration said invalid index, raise an IndexError
+            if line.startswith(b"Invalid index"):
+                raise IndexError("configuration index out of range")
+            # If there is no configuration, return an empty SinkConfig
+            elif line.startswith(b"No configuration"):
+                return cls()
+            # If this line is the status field
+            elif line.startswith(b"status: "):
+                line = line.split()[1:]
+                if line[0] == b"empty":
+                    status = SinkStatus.EMPTY
+                elif line[0] == b"valid":
+                    status = SinkStatus.VALID
+                elif line[0] == b"invalid":
+                    status = SinkStatus.INVALID
+            # If this line is the flags field
+            elif line.startswith(b"flags: "):
+                line = line.split()[1:]
+                flags = SinkFlags.NONE
+                for word in line:
+                    if word == b"(none)":
+                        # If there are no flags set, stop looking
+                        break
+                    elif word == b"GiveBack":
+                        flags |= SinkFlags.GIVEBACK
+            # If this line is the v field
+            elif line.startswith(b"v: "):
+                word = line.split()[1]
+                v = round(1000*float(word))
+            # If this line is the i field
+            elif line.startswith(b"i: "):
+                word = line.split()[1]
+                i = round(1000*float(word))
+
+        # Create a new SinkConfig object with the values we just read
+        return cls(status=status, flags=flags, v=v, i=i)
+
+
+class SinkStatus(Enum):
+    """Status field of a PD Buddy Sink configuration object"""
+    EMPTY = 1
+    VALID = 2
+    INVALID = 3
+
+
+class SinkFlags(Flag):
+    """Flags field of a PD Buddy Sink configuration object"""
+    NONE = 0
+    GIVEBACK = auto()