Bladeren bron

Added a simple PD Buddy Sink configuration library

Clara Hobbs 7 jaren geleden
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3 gewijzigde bestanden met toevoegingen van 981 en 1 verwijderingen
  1. 674
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      LICENSE
  2. 39
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      README.md
  3. 268
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      pdbuddy/__init__.py

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+                     END OF TERMS AND CONDITIONS
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+            How to Apply These Terms to Your New Programs
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+  The GNU General Public License does not permit incorporating your program
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+into proprietary programs.  If your program is a subroutine library, you
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+the library.  If this is what you want to do, use the GNU Lesser General
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+<http://www.gnu.org/philosophy/why-not-lgpl.html>.

+ 39
- 1
README.md Bestand weergeven

@@ -1,3 +1,41 @@
1 1
 # pd-buddy-python
2 2
 
3
-Python library for working with the PD Buddy Sink Serial Console Configuration Interface
3
+Python library for working with the PD Buddy Sink Serial Console Configuration
4
+Interface
5
+
6
+## Features
7
+
8
+* Provides a Pythonic interface to the PD Buddy Sink shell commands
9
+* Configuration is represented as a SinkConfig object
10
+* SinkConfig objects can be manipulated locally and written to the device with
11
+  one method call
12
+
13
+## Examples
14
+
15
+### Open the first PD Buddy Sink device and read its configuration
16
+
17
+    >>> import pdbuddy
18
+    >>> pdbs = pdbuddy.Sink(list(pdbuddy.Sink.get_devices())[0])
19
+    >>> pdbs.get_cfg()
20
+    SinkConfig(status=SinkStatus.VALID, flags=SinkFlags.NONE, v=5000, i=3000)
21
+
22
+### Locally manipulate a SinkConfig object
23
+
24
+    >>> cfg = pdbs.get_cfg()
25
+    >>> cfg.v = 20000
26
+    >>> cfg.i = 2250
27
+    >>> cfg.flags |= pdbuddy.SinkFlags.GIVEBACK
28
+    >>> cfg
29
+    SinkConfig(status=SinkStatus.VALID, flags=SinkFlags.GIVEBACK, v=20000, i=2250)
30
+
31
+### Write the SinkConfig object to flash
32
+
33
+    >>> pdbs.set_tmpcfg(cfg)
34
+    >>> pdbs.write()
35
+    >>> pdbs.get_cfg()
36
+    SinkConfig(status=SinkStatus.VALID, flags=SinkFlags.GIVEBACK, v=20000, i=2250)
37
+
38
+## Requirements
39
+
40
+* Python >= 3.4 should work (tested with 3.6)
41
+* pySerial (tested with 3.3)

+ 268
- 0
pdbuddy/__init__.py Bestand weergeven

@@ -0,0 +1,268 @@
1
+"""Python bindings for PD Buddy Sink configuration"""
2
+
3
+from enum import *
4
+
5
+import serial
6
+import serial.tools.list_ports
7
+
8
+
9
+class Sink:
10
+    """Interface for configuring a PD Buddy Sink"""
11
+    vid = 0x1209
12
+    pid = 0x0001
13
+
14
+    def __init__(self, sp):
15
+        """Open the serial port to communicate with the PD Buddy Sink
16
+        
17
+        Parameters:
18
+            sp: A serial.tools.list_ports.ListPortInfo object
19
+        """
20
+        self.port = serial.Serial(sp.device, baudrate=115200, timeout=0.01)
21
+
22
+    def send_command(self, cmd):
23
+        """Send a command to the PD Buddy Sink, returning the result
24
+        
25
+        Parameters:
26
+            cmd: A string containing the text to send to the Sink
27
+        
28
+        Returns:
29
+            A list of zero or more bytes objects, each being one line printed
30
+            as a response to the command.
31
+        """
32
+        # Send the command
33
+        self.port.write(bytes(cmd, 'utf-8') + b'\r\n')
34
+        self.port.flush()
35
+
36
+        # Read the result
37
+        answer = self.port.readlines()
38
+
39
+        # Remove the echoed command and prompt
40
+        answer = answer[1:-1]
41
+        return answer
42
+
43
+    def help(self):
44
+        """Returns the help text from the PD Buddy Sink"""
45
+        return self.send_command("help")
46
+
47
+    def license(self):
48
+        """Returns the license text from the PD Buddy Sink"""
49
+        return self.send_command("license")
50
+
51
+    def erase(self):
52
+        """Synchronously erases all stored configuration from flash"""
53
+        self.send_command("erase")
54
+
55
+    def write(self):
56
+        """Synchronously writes the contents of the configuration buffer to flash"""
57
+        self.send_command("write")
58
+
59
+    def load(self):
60
+        """Loads the current configuration from flash into the buffer
61
+        
62
+        Raises KeyError if there is no configuration in flash.
63
+        """
64
+        text = self.send_command("load")
65
+        if len(text) > 0 and text[0].startswith(b"No configuration"):
66
+            raise KeyError("no configuration")
67
+
68
+    def get_cfg(self, index=None):
69
+        """Reads configuration from flash
70
+         
71
+        Parameters:
72
+            index: Optional index of configuration object in flash to read
73
+
74
+        Returns:
75
+            A SinkConfig object
76
+        """
77
+        if index is None:
78
+            cfg = self.send_command("get_cfg")
79
+        else:
80
+            cfg = self.send_command("get_cfg {}".format(index))
81
+
82
+        return SinkConfig.from_text(cfg)
83
+
84
+    def get_tmpcfg(self):
85
+        """Reads the contents of the configuration buffer
86
+
87
+        Returns:
88
+            A SinkConfig object
89
+        """
90
+        cfg = self.send_command("get_tmpcfg")
91
+
92
+        return SinkConfig.from_text(cfg)
93
+
94
+    def clear_flags(self):
95
+        """Clears all the flags in the configuration buffer"""
96
+        self.send_command("clear_flags")
97
+
98
+    def toggle_giveback(self):
99
+        """Toggles the GiveBack flag in the configuration buffer"""
100
+        self.send_command("toggle_giveback")
101
+
102
+    def set_v(self, mv):
103
+        """Sets the voltage of the configuration buffer, in millivolts"""
104
+        self.send_command("set_v {}".format(mv))
105
+
106
+    def set_i(self, ma):
107
+        """Sets the current of the configuration buffer, in milliamperes"""
108
+        self.send_command("set_i {}".format(ma))
109
+
110
+    def identify(self):
111
+        """Blinks the LED quickly"""
112
+        self.send_command("identify")
113
+
114
+    def set_tmpcfg(self, sc):
115
+        """Writes a SinkConfig object to the device's configuration buffer
116
+        
117
+        Note: the value of the status field is ignored; it will always be
118
+        SinkStatus.VALID.
119
+        """
120
+        # Set flags
121
+        self.clear_flags()
122
+        if sc.flags & SinkFlags.GIVEBACK:
123
+            self.toggle_giveback()
124
+
125
+        # Set voltage
126
+        self.set_v(sc.v)
127
+        
128
+        # Set current
129
+        self.set_i(sc.i)
130
+
131
+    @classmethod
132
+    def get_devices(cls):
133
+        """Get an iterable of PD Buddy Sink devices
134
+        
135
+        Returns an iterable of serial.tools.list_ports.ListPortInfo objects.
136
+        """
137
+        return serial.tools.list_ports.grep("{:04X}:{:04X}".format(cls.vid,
138
+            cls.pid))
139
+
140
+
141
+class SinkConfig:
142
+    """Python representation of a PD Buddy Sink configuration object"""
143
+
144
+    def __init__(self, status=None, flags=None, v=None, i=None):
145
+        """Create a SinkConfig object
146
+        
147
+        Parameters:
148
+            status: A SinkStatus value
149
+            flags: Zero or more SinkFlags values
150
+            v: Voltage in millivolts
151
+            i: Current in milliamperes
152
+        """
153
+        self.status = status
154
+        self.flags = flags
155
+        self.v = v
156
+        self.i = i
157
+
158
+    def __repr__(self):
159
+        s = type(self).__name__ + "("
160
+
161
+        if self.status is not None:
162
+            s += "status={}".format(self.status)
163
+
164
+        if self.flags is not None:
165
+            if not s.endswith("("):
166
+                s += ", "
167
+            s += "flags={}".format(self.flags)
168
+
169
+        if self.v is not None:
170
+            if not s.endswith("("):
171
+                s += ", "
172
+            s += "v={}".format(self.v)
173
+
174
+        if self.i is not None:
175
+            if not s.endswith("("):
176
+                s += ", "
177
+            s += "i={}".format(self.i)
178
+
179
+        s += ")"
180
+
181
+        return s
182
+
183
+    def __eq__(self, other):
184
+        if isinstance(other, self.__class__):
185
+            if other.status is not self.status:
186
+                return False
187
+            if other.flags is not self.flags:
188
+                return False
189
+            if other.v != self.v:
190
+                return False
191
+            if other.i != self.i:
192
+                return False
193
+            return True
194
+        return NotImplemented
195
+
196
+    def __ne__(self, other):
197
+        if isinstance(other, self.__class__):
198
+            return not self.__eq__(other)
199
+        return NotImplemented
200
+
201
+    def __hash__(self):
202
+        return hash(tuple(sorted(self.__dict__.items())))
203
+
204
+    @classmethod
205
+    def from_text(cls, text):
206
+        """Creates a SinkConfig from text returned by Sink.send_command
207
+        
208
+        Returns a new SinkConfig object.
209
+
210
+        Raises IndexError if the configuration reads "Invalid index".
211
+        """
212
+        # Assume the parameters will all be None
213
+        status = None
214
+        flags = None
215
+        v = None
216
+        i = None
217
+
218
+        # Iterate over all lines of text
219
+        for line in text:
220
+            # If the configuration said invalid index, raise an IndexError
221
+            if line.startswith(b"Invalid index"):
222
+                raise IndexError("configuration index out of range")
223
+            # If there is no configuration, return an empty SinkConfig
224
+            elif line.startswith(b"No configuration"):
225
+                return cls()
226
+            # If this line is the status field
227
+            elif line.startswith(b"status: "):
228
+                line = line.split()[1:]
229
+                if line[0] == b"empty":
230
+                    status = SinkStatus.EMPTY
231
+                elif line[0] == b"valid":
232
+                    status = SinkStatus.VALID
233
+                elif line[0] == b"invalid":
234
+                    status = SinkStatus.INVALID
235
+            # If this line is the flags field
236
+            elif line.startswith(b"flags: "):
237
+                line = line.split()[1:]
238
+                flags = SinkFlags.NONE
239
+                for word in line:
240
+                    if word == b"(none)":
241
+                        # If there are no flags set, stop looking
242
+                        break
243
+                    elif word == b"GiveBack":
244
+                        flags |= SinkFlags.GIVEBACK
245
+            # If this line is the v field
246
+            elif line.startswith(b"v: "):
247
+                word = line.split()[1]
248
+                v = round(1000*float(word))
249
+            # If this line is the i field
250
+            elif line.startswith(b"i: "):
251
+                word = line.split()[1]
252
+                i = round(1000*float(word))
253
+
254
+        # Create a new SinkConfig object with the values we just read
255
+        return cls(status=status, flags=flags, v=v, i=i)
256
+
257
+
258
+class SinkStatus(Enum):
259
+    """Status field of a PD Buddy Sink configuration object"""
260
+    EMPTY = 1
261
+    VALID = 2
262
+    INVALID = 3
263
+
264
+
265
+class SinkFlags(Flag):
266
+    """Flags field of a PD Buddy Sink configuration object"""
267
+    NONE = 0
268
+    GIVEBACK = auto()

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