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, a):
+    """Set the max startup output current. the unit of |a| : Amperes """
+    assert a >= 0 and a <= 8
 
-  def SetMaxCurrent(self, i):
-    """Set the max output current."""
-    assert i >= 0 and i <= 8
+    val = 1023 - int((a/8.0)*1023)
+    self._SendStruct('BBB', 0x01, 0x08, val & 0xff)
+    self._SendStruct('BBB', 0x01, 0x09, val >> 8)
 
-    val = 1023 - int((i/8)*1023)
+  def SetMaxCurrent(self, a):
+    """Set the max output current. the unit of |a| : Amperes """
+    assert a >= 0 and a <= 8
+
+    val = 1023 - int((a/8.0)*1023)
     self._SendStruct('BBB', 0x01, 0x0a, val & 0xff)
     self._SendStruct('BBB', 0x01, 0x0b, val >> 8)
 
   def SetUsbPassthrough(self, val):
     """Set the USB passthrough mode: 0 = off, 1 = on,  2 = auto."""
     self._SendStruct('BBB', 0x01, 0x10, val)
 
 
   def StartDataCollection(self):
     """Tell the device to start collecting and sending measurement data."""
@@ skipping 104 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)