Initial pass at configurable motor test script

- Input script is JSON file of timed attribute/value pairs
- Script name is hard wired
- Logs speed, duty_cycle, position

Author: rhempel

tests/motor/run-direct.json

@@ -0,0 +1,22 @@
+{ "meta": { "name": "run-direct-test",
+            "interval": 10           ,
+            "max_time": 4000 },
+  "data": [ { "port": "outA",
+              "commands": [ { "time": 0,
+                              "attributes": [ { "duty_cycle_sp": 0 },
+                                              { "command": "run-direct" } ] },
+                            { "time": 400,
+                              "attributes": [ { "duty_cycle_sp": 20 } ] },
+                            { "time": 800,
+                              "attributes": [ { "duty_cycle_sp": 40 } ] },
+                            { "time": 1200,
+                              "attributes": [ { "duty_cycle_sp": 60 } ] },
+                            { "time": 1600,
+                              "attributes": [ { "duty_cycle_sp": 80 } ] },
+                            { "time": 2000,
+                              "attributes": [ { "duty_cycle_sp": 100 } ] },
+                            { "time": 3000,
+                              "attributes": [ { "duty_cycle_sp": 0 } ] },
+                            { "time": 3500,
+                              "attributes": [ { "command": "stop" } ] } ] } ]
+}

tests/motor/test.py

@@ -0,0 +1,65 @@
+#! /usr/bin/python2.7
+
+import json
+import time
+import ev3dev.ev3 as ev3
+
+def next_commands():
+        for d in test['data']:
+                for c in d['commands']:
+                        yield c
+
+test = json.loads( open( './run-direct.json' ).read() )
+
+print test['data'][0]['port']
+m = ev3.Motor( test['data'][0]['port'] )
+
+name     = test['meta']['name']
+interval = test['meta']['interval']
+max_time = test['meta']['max_time']
+
+start = time.clock()
+end   = start + max_time/1000
+
+intervals = [x/1000.0 for x in range( 0, max_time, interval )]
+
+now = time.clock()
+
+commands = next_commands()
+
+c = commands.next()
+
+next_interval = c['time']/1000.0
+results = []
+
+for i in intervals:
+        i = i + start
+        while now < i:
+                now = time.clock()
+        if now >= start + next_interval:
+                print i, next_interval, now
+                for a in c['attributes']:
+                        for k in a.keys():
+                                print "    ", k, " = ", a[k]
+                                setattr(m,k,a[k])
+                try:
+                        c = commands.next()
+                        next_interval = c['time']/1000.0
+                except StopIteration:
+                        next_interval = max_time/1000.0
+        results.append( (now-start, (m.speed, m.position, m.duty_cycle)) )
+
+
+print 'data = ['
+
+first = True
+for r in results:
+        if first:
+                print( '      ({0}, ({1}, {2}, {3}))'.format(r[0], r[1][0], r[1][1], r[1][2]))
+                first = False
+        else:
+                print( '    , ({0}, ({1}, {2}, {3}))'.format(r[0], r[1][0], r[1][1], r[1][2]))
+
+print ']'
+
+