Add SetStartupCurrent to monsoon profiler.

tools/telemetry/telemetry/core/platform/profiler/monsoon.py

 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Interface for a USB-connected Monsoon power meter.
 
 http://msoon.com/LabEquipment/PowerMonitor/
 Currently Unix-only. Relies on fcntl, /dev, and /tmp.
 """
 
@@ skipping 138 matching lines @@
       return status
 
 
   def SetVoltage(self, v):
     """Set the output voltage, 0 to disable."""
     if v == 0:
       self._SendStruct('BBB', 0x01, 0x01, 0x00)
     else:
       self._SendStruct('BBB', 0x01, 0x01, int((v - 2.0) * 100))
 
+  def SetStartupCurrent(self, i):
+    """Set the max startup output current."""

[tonyg, 2015/03/17 13:58:28]

It'd be nice if this explain the units of |i| -- mA?

[JungJik, 2015/03/18 10:21:28]

Done.

+    assert i >= 0 and i <= 8
+
+    val = 1023 - int((i/8)*1023)

[tonyg, 2015/03/17 13:58:28]

I don't think this does what you want.
0
0

[JungJik, 2015/03/18 10:21:28]

PTAL again.
it looks like confusing |i| as integer.

so I change |i| to |a| (ampere) 
and make |a| be divided by float.

whether the |a| is integer or not, it can give the right value to monsoon.

thanks for the review.

+    self._SendStruct('BBB', 0x01, 0x08, val & 0xff)
+    self._SendStruct('BBB', 0x01, 0x09, val >> 8)
 
   def SetMaxCurrent(self, i):
     """Set the max output current."""
     assert i >= 0 and i <= 8
 
     val = 1023 - int((i/8)*1023)
     self._SendStruct('BBB', 0x01, 0x0a, val & 0xff)
     self._SendStruct('BBB', 0x01, 0x0b, val >> 8)
 
   def SetUsbPassthrough(self, val):
@@ skipping 110 matching lines @@
         logging.error('exception from serial port')
         return None
       elif len(ready_r) > 0:
         flushed += 1
         self.ser.read(1)  # This may cause underlying buffering.
         self.ser.flush()  # Flush the underlying buffer too.
       else:
         break
     if flushed > 0:
       logging.debug('dropped >%d bytes', flushed)