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yocto_gyro.py
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#*********************************************************************
#*
#* $Id: yocto_gyro.py 24948 2016-07-01 20:57:28Z mvuilleu $
#*
#* Implements yFindGyro(), the high-level API for Gyro functions
#*
#* - - - - - - - - - License information: - - - - - - - - -
#*
#* Copyright (C) 2011 and beyond by Yoctopuce Sarl, Switzerland.
#*
#* Yoctopuce Sarl (hereafter Licensor) grants to you a perpetual
#* non-exclusive license to use, modify, copy and integrate this
#* file into your software for the sole purpose of interfacing
#* with Yoctopuce products.
#*
#* You may reproduce and distribute copies of this file in
#* source or object form, as long as the sole purpose of this
#* code is to interface with Yoctopuce products. You must retain
#* this notice in the distributed source file.
#*
#* You should refer to Yoctopuce General Terms and Conditions
#* for additional information regarding your rights and
#* obligations.
#*
#* THE SOFTWARE AND DOCUMENTATION ARE PROVIDED 'AS IS' WITHOUT
#* WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING
#* WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY, FITNESS
#* FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO
#* EVENT SHALL LICENSOR BE LIABLE FOR ANY INCIDENTAL, SPECIAL,
#* INDIRECT OR CONSEQUENTIAL DAMAGES, LOST PROFITS OR LOST DATA,
#* COST OF PROCUREMENT OF SUBSTITUTE GOODS, TECHNOLOGY OR
#* SERVICES, ANY CLAIMS BY THIRD PARTIES (INCLUDING BUT NOT
#* LIMITED TO ANY DEFENSE THEREOF), ANY CLAIMS FOR INDEMNITY OR
#* CONTRIBUTION, OR OTHER SIMILAR COSTS, WHETHER ASSERTED ON THE
#* BASIS OF CONTRACT, TORT (INCLUDING NEGLIGENCE), BREACH OF
#* WARRANTY, OR OTHERWISE.
#*
#*********************************************************************/
import math
__docformat__ = 'restructuredtext en'
from yocto_api import *
#--- (generated code: YQt class start)
#noinspection PyProtectedMember
class YQt(YSensor):
"""
The Yoctopuce API YQt class provides direct access to the Yocto3D attitude estimation
using a quaternion. It is usually not needed to use the YQt class directly, as the
YGyro class provides a more convenient higher-level interface.
"""
#--- (end of generated code: YQt class start)
#--- (generated code: YQt return codes)
#--- (end of generated code: YQt return codes)
#--- (generated code: YQt definitions)
#--- (end of generated code: YQt definitions)
def __init__(self, func):
super(YQt, self).__init__(func)
self._className = 'Qt'
#--- (generated code: YQt attributes)
self._callback = None
#--- (end of generated code: YQt attributes)
#--- (generated code: YQt implementation)
def _parseAttr(self, member):
super(YQt, self)._parseAttr(member)
@staticmethod
def FindQt(func):
"""
Retrieves a quaternion component for a given identifier.
The identifier can be specified using several formats:
<ul>
<li>FunctionLogicalName</li>
<li>ModuleSerialNumber.FunctionIdentifier</li>
<li>ModuleSerialNumber.FunctionLogicalName</li>
<li>ModuleLogicalName.FunctionIdentifier</li>
<li>ModuleLogicalName.FunctionLogicalName</li>
</ul>
This function does not require that the quaternion component is online at the time
it is invoked. The returned object is nevertheless valid.
Use the method YQt.isOnline() to test if the quaternion component is
indeed online at a given time. In case of ambiguity when looking for
a quaternion component by logical name, no error is notified: the first instance
found is returned. The search is performed first by hardware name,
then by logical name.
@param func : a string that uniquely characterizes the quaternion component
@return a YQt object allowing you to drive the quaternion component.
"""
# obj
obj = YFunction._FindFromCache("Qt", func)
if obj is None:
obj = YQt(func)
YFunction._AddToCache("Qt", func, obj)
return obj
def nextQt(self):
"""
Continues the enumeration of quaternion components started using yFirstQt().
@return a pointer to a YQt object, corresponding to
a quaternion component currently online, or a None pointer
if there are no more quaternion components to enumerate.
"""
hwidRef = YRefParam()
if YAPI.YISERR(self._nextFunction(hwidRef)):
return None
if hwidRef.value == "":
return None
return YQt.FindQt(hwidRef.value)
#--- (end of generated code: YQt implementation)
#--- (generated code: Qt functions)
@staticmethod
def FirstQt():
"""
Starts the enumeration of quaternion components currently accessible.
Use the method YQt.nextQt() to iterate on
next quaternion components.
@return a pointer to a YQt object, corresponding to
the first quaternion component currently online, or a None pointer
if there are none.
"""
devRef = YRefParam()
neededsizeRef = YRefParam()
serialRef = YRefParam()
funcIdRef = YRefParam()
funcNameRef = YRefParam()
funcValRef = YRefParam()
errmsgRef = YRefParam()
size = YAPI.C_INTSIZE
#noinspection PyTypeChecker,PyCallingNonCallable
p = (ctypes.c_int * 1)()
err = YAPI.apiGetFunctionsByClass("Qt", 0, p, size, neededsizeRef, errmsgRef)
if YAPI.YISERR(err) or not neededsizeRef.value:
return None
if YAPI.YISERR(
YAPI.yapiGetFunctionInfo(p[0], devRef, serialRef, funcIdRef, funcNameRef, funcValRef, errmsgRef)):
return None
return YQt.FindQt(serialRef.value + "." + funcIdRef.value)
#--- (end of generated code: Qt functions)
def yInternalGyroCallback(YQt_obj, str_value):
gyro = YQt_obj.get_userData()
if gyro is None:
return
tmp = YQt_obj.get_functionId()[2]
idx = int(tmp)
dbl_value = float(str_value)
# noinspection PyProtectedMember
gyro._invokeGyroCallbacks(idx, dbl_value)
#--- (generated code: YGyro class start)
#noinspection PyProtectedMember
class YGyro(YSensor):
"""
The YSensor class is the parent class for all Yoctopuce sensors. It can be
used to read the current value and unit of any sensor, read the min/max
value, configure autonomous recording frequency and access recorded data.
It also provide a function to register a callback invoked each time the
observed value changes, or at a predefined interval. Using this class rather
than a specific subclass makes it possible to create generic applications
that work with any Yoctopuce sensor, even those that do not yet exist.
Note: The YAnButton class is the only analog input which does not inherit
from YSensor.
"""
#--- (end of generated code: YGyro class start)
#--- (generated code: YGyro return codes)
#--- (end of generated code: YGyro return codes)
#--- (generated code: YGyro definitions)
BANDWIDTH_INVALID = YAPI.INVALID_INT
XVALUE_INVALID = YAPI.INVALID_DOUBLE
YVALUE_INVALID = YAPI.INVALID_DOUBLE
ZVALUE_INVALID = YAPI.INVALID_DOUBLE
#--- (end of generated code: YGyro definitions)
def __init__(self, func):
super(YGyro, self).__init__(func)
self._className = 'Gyro'
#--- (generated code: YGyro attributes)
self._callback = None
self._bandwidth = YGyro.BANDWIDTH_INVALID
self._xValue = YGyro.XVALUE_INVALID
self._yValue = YGyro.YVALUE_INVALID
self._zValue = YGyro.ZVALUE_INVALID
self._qt_stamp = 0
self._qt_w = None
self._qt_x = None
self._qt_y = None
self._qt_z = None
self._w = 0
self._x = 0
self._y = 0
self._z = 0
self._angles_stamp = 0
self._head = 0
self._pitch = 0
self._roll = 0
self._quatCallback = None
self._anglesCallback = None
#--- (end of generated code: YGyro attributes)
#--- (generated code: YGyro implementation)
def _parseAttr(self, member):
if member.name == "bandwidth":
self._bandwidth = member.ivalue
return 1
if member.name == "xValue":
self._xValue = round(member.ivalue * 1000.0 / 65536.0) / 1000.0
return 1
if member.name == "yValue":
self._yValue = round(member.ivalue * 1000.0 / 65536.0) / 1000.0
return 1
if member.name == "zValue":
self._zValue = round(member.ivalue * 1000.0 / 65536.0) / 1000.0
return 1
super(YGyro, self)._parseAttr(member)
def get_bandwidth(self):
"""
Returns the measure update frequency, measured in Hz (Yocto-3D-V2 only).
@return an integer corresponding to the measure update frequency, measured in Hz (Yocto-3D-V2 only)
On failure, throws an exception or returns YGyro.BANDWIDTH_INVALID.
"""
if self._cacheExpiration <= YAPI.GetTickCount():
if self.load(YAPI.DefaultCacheValidity) != YAPI.SUCCESS:
return YGyro.BANDWIDTH_INVALID
return self._bandwidth
def set_bandwidth(self, newval):
"""
Changes the measure update frequency, measured in Hz (Yocto-3D-V2 only). When the
frequency is lower, the device performs averaging.
@param newval : an integer corresponding to the measure update frequency, measured in Hz (Yocto-3D-V2 only)
@return YAPI.SUCCESS if the call succeeds.
On failure, throws an exception or returns a negative error code.
"""
rest_val = str(newval)
return self._setAttr("bandwidth", rest_val)
def get_xValue(self):
"""
Returns the angular velocity around the X axis of the device, as a floating point number.
@return a floating point number corresponding to the angular velocity around the X axis of the
device, as a floating point number
On failure, throws an exception or returns YGyro.XVALUE_INVALID.
"""
if self._cacheExpiration <= YAPI.GetTickCount():
if self.load(YAPI.DefaultCacheValidity) != YAPI.SUCCESS:
return YGyro.XVALUE_INVALID
return self._xValue
def get_yValue(self):
"""
Returns the angular velocity around the Y axis of the device, as a floating point number.
@return a floating point number corresponding to the angular velocity around the Y axis of the
device, as a floating point number
On failure, throws an exception or returns YGyro.YVALUE_INVALID.
"""
if self._cacheExpiration <= YAPI.GetTickCount():
if self.load(YAPI.DefaultCacheValidity) != YAPI.SUCCESS:
return YGyro.YVALUE_INVALID
return self._yValue
def get_zValue(self):
"""
Returns the angular velocity around the Z axis of the device, as a floating point number.
@return a floating point number corresponding to the angular velocity around the Z axis of the
device, as a floating point number
On failure, throws an exception or returns YGyro.ZVALUE_INVALID.
"""
if self._cacheExpiration <= YAPI.GetTickCount():
if self.load(YAPI.DefaultCacheValidity) != YAPI.SUCCESS:
return YGyro.ZVALUE_INVALID
return self._zValue
@staticmethod
def FindGyro(func):
"""
Retrieves a gyroscope for a given identifier.
The identifier can be specified using several formats:
<ul>
<li>FunctionLogicalName</li>
<li>ModuleSerialNumber.FunctionIdentifier</li>
<li>ModuleSerialNumber.FunctionLogicalName</li>
<li>ModuleLogicalName.FunctionIdentifier</li>
<li>ModuleLogicalName.FunctionLogicalName</li>
</ul>
This function does not require that the gyroscope is online at the time
it is invoked. The returned object is nevertheless valid.
Use the method YGyro.isOnline() to test if the gyroscope is
indeed online at a given time. In case of ambiguity when looking for
a gyroscope by logical name, no error is notified: the first instance
found is returned. The search is performed first by hardware name,
then by logical name.
@param func : a string that uniquely characterizes the gyroscope
@return a YGyro object allowing you to drive the gyroscope.
"""
# obj
obj = YFunction._FindFromCache("Gyro", func)
if obj is None:
obj = YGyro(func)
YFunction._AddToCache("Gyro", func, obj)
return obj
def _loadQuaternion(self):
# now_stamp
# age_ms
now_stamp = (YRelTickCount(YAPI.GetTickCount()) & (0x7FFFFFFF))
age_ms = (((now_stamp - self._qt_stamp)) & (0x7FFFFFFF))
if (age_ms >= 10) or (self._qt_stamp == 0):
if self.load(10) != YAPI.SUCCESS:
return YAPI.DEVICE_NOT_FOUND
if self._qt_stamp == 0:
self._qt_w = YQt.FindQt("" + self._serial + ".qt1")
self._qt_x = YQt.FindQt("" + self._serial + ".qt2")
self._qt_y = YQt.FindQt("" + self._serial + ".qt3")
self._qt_z = YQt.FindQt("" + self._serial + ".qt4")
#
if self._qt_w.load(9) != YAPI.SUCCESS:
return YAPI.DEVICE_NOT_FOUND
if self._qt_x.load(9) != YAPI.SUCCESS:
return YAPI.DEVICE_NOT_FOUND
if self._qt_y.load(9) != YAPI.SUCCESS:
return YAPI.DEVICE_NOT_FOUND
if self._qt_z.load(9) != YAPI.SUCCESS:
return YAPI.DEVICE_NOT_FOUND
self._w = self._qt_w.get_currentValue()
self._x = self._qt_x.get_currentValue()
self._y = self._qt_y.get_currentValue()
self._z = self._qt_z.get_currentValue()
self._qt_stamp = now_stamp
return YAPI.SUCCESS
def _loadAngles(self):
# sqw
# sqx
# sqy
# sqz
# norm
# delta
# // may throw an exception
if self._loadQuaternion() != YAPI.SUCCESS:
return YAPI.DEVICE_NOT_FOUND
if self._angles_stamp != self._qt_stamp:
sqw = self._w * self._w
sqx = self._x * self._x
sqy = self._y * self._y
sqz = self._z * self._z
norm = sqx + sqy + sqz + sqw
delta = self._y * self._w - self._x * self._z
if delta > 0.499 * norm:
#
self._pitch = 90.0
self._head = round(2.0 * 1800.0/math.pi * math.atan2(self._x,-self._w)) / 10.0
else:
if delta < -0.499 * norm:
#
self._pitch = -90.0
self._head = round(-2.0 * 1800.0/math.pi * math.atan2(self._x,-self._w)) / 10.0
else:
self._roll = round(1800.0/math.pi * math.atan2(2.0 * (self._w * self._x + self._y * self._z),sqw - sqx - sqy + sqz)) / 10.0
self._pitch = round(1800.0/math.pi * math.asin(2.0 * delta / norm)) / 10.0
self._head = round(1800.0/math.pi * math.atan2(2.0 * (self._x * self._y + self._z * self._w),sqw + sqx - sqy - sqz)) / 10.0
self._angles_stamp = self._qt_stamp
return YAPI.SUCCESS
def get_roll(self):
"""
Returns the estimated roll angle, based on the integration of
gyroscopic measures combined with acceleration and
magnetic field measurements.
The axis corresponding to the roll angle can be mapped to any
of the device X, Y or Z physical directions using methods of
the class YRefFrame.
@return a floating-point number corresponding to roll angle
in degrees, between -180 and +180.
"""
# // may throw an exception
self._loadAngles()
return self._roll
def get_pitch(self):
"""
Returns the estimated pitch angle, based on the integration of
gyroscopic measures combined with acceleration and
magnetic field measurements.
The axis corresponding to the pitch angle can be mapped to any
of the device X, Y or Z physical directions using methods of
the class YRefFrame.
@return a floating-point number corresponding to pitch angle
in degrees, between -90 and +90.
"""
# // may throw an exception
self._loadAngles()
return self._pitch
def get_heading(self):
"""
Returns the estimated heading angle, based on the integration of
gyroscopic measures combined with acceleration and
magnetic field measurements.
The axis corresponding to the heading can be mapped to any
of the device X, Y or Z physical directions using methods of
the class YRefFrame.
@return a floating-point number corresponding to heading
in degrees, between 0 and 360.
"""
# // may throw an exception
self._loadAngles()
return self._head
def get_quaternionW(self):
"""
Returns the w component (real part) of the quaternion
describing the device estimated orientation, based on the
integration of gyroscopic measures combined with acceleration and
magnetic field measurements.
@return a floating-point number corresponding to the w
component of the quaternion.
"""
# // may throw an exception
self._loadQuaternion()
return self._w
def get_quaternionX(self):
"""
Returns the x component of the quaternion
describing the device estimated orientation, based on the
integration of gyroscopic measures combined with acceleration and
magnetic field measurements. The x component is
mostly correlated with rotations on the roll axis.
@return a floating-point number corresponding to the x
component of the quaternion.
"""
# // may throw an exception
self._loadQuaternion()
return self._x
def get_quaternionY(self):
"""
Returns the y component of the quaternion
describing the device estimated orientation, based on the
integration of gyroscopic measures combined with acceleration and
magnetic field measurements. The y component is
mostly correlated with rotations on the pitch axis.
@return a floating-point number corresponding to the y
component of the quaternion.
"""
# // may throw an exception
self._loadQuaternion()
return self._y
def get_quaternionZ(self):
"""
Returns the x component of the quaternion
describing the device estimated orientation, based on the
integration of gyroscopic measures combined with acceleration and
magnetic field measurements. The x component is
mostly correlated with changes of heading.
@return a floating-point number corresponding to the z
component of the quaternion.
"""
# // may throw an exception
self._loadQuaternion()
return self._z
def registerQuaternionCallback(self, callback):
"""
Registers a callback function that will be invoked each time that the estimated
device orientation has changed. The call frequency is typically around 95Hz during a move.
The callback is invoked only during the execution of ySleep or yHandleEvents.
This provides control over the time when the callback is triggered.
For good responsiveness, remember to call one of these two functions periodically.
To unregister a callback, pass a None pointer as argument.
@param callback : the callback function to invoke, or a None pointer.
The callback function should take five arguments:
the YGyro object of the turning device, and the floating
point values of the four components w, x, y and z
(as floating-point numbers).
@noreturn
"""
self._quatCallback = callback
if callback is not None:
#
if self._loadQuaternion() != YAPI.SUCCESS:
return YAPI.DEVICE_NOT_FOUND
self._qt_w.set_userData(self)
self._qt_x.set_userData(self)
self._qt_y.set_userData(self)
self._qt_z.set_userData(self)
self._qt_w.registerValueCallback(yInternalGyroCallback)
self._qt_x.registerValueCallback(yInternalGyroCallback)
self._qt_y.registerValueCallback(yInternalGyroCallback)
self._qt_z.registerValueCallback(yInternalGyroCallback)
else:
if not (self._anglesCallback is not None):
self._qt_w.registerValueCallback(None)
self._qt_x.registerValueCallback(None)
self._qt_y.registerValueCallback(None)
self._qt_z.registerValueCallback(None)
return 0
def registerAnglesCallback(self, callback):
"""
Registers a callback function that will be invoked each time that the estimated
device orientation has changed. The call frequency is typically around 95Hz during a move.
The callback is invoked only during the execution of ySleep or yHandleEvents.
This provides control over the time when the callback is triggered.
For good responsiveness, remember to call one of these two functions periodically.
To unregister a callback, pass a None pointer as argument.
@param callback : the callback function to invoke, or a None pointer.
The callback function should take four arguments:
the YGyro object of the turning device, and the floating
point values of the three angles roll, pitch and heading
in degrees (as floating-point numbers).
@noreturn
"""
self._anglesCallback = callback
if callback is not None:
#
if self._loadQuaternion() != YAPI.SUCCESS:
return YAPI.DEVICE_NOT_FOUND
self._qt_w.set_userData(self)
self._qt_x.set_userData(self)
self._qt_y.set_userData(self)
self._qt_z.set_userData(self)
self._qt_w.registerValueCallback(yInternalGyroCallback)
self._qt_x.registerValueCallback(yInternalGyroCallback)
self._qt_y.registerValueCallback(yInternalGyroCallback)
self._qt_z.registerValueCallback(yInternalGyroCallback)
else:
if not (self._quatCallback is not None):
self._qt_w.registerValueCallback(None)
self._qt_x.registerValueCallback(None)
self._qt_y.registerValueCallback(None)
self._qt_z.registerValueCallback(None)
return 0
def _invokeGyroCallbacks(self, qtIndex, qtValue):
if qtIndex - 1 == 0:
self._w = qtValue
elif qtIndex - 1 == 1:
self._x = qtValue
elif qtIndex - 1 == 2:
self._y = qtValue
elif qtIndex - 1 == 3:
self._z = qtValue
if qtIndex < 4:
return 0
self._qt_stamp = (YRelTickCount(YAPI.GetTickCount()) & (0x7FFFFFFF))
if self._quatCallback is not None:
self._quatCallback(self, self._w, self._x, self._y, self._z)
if self._anglesCallback is not None:
#
self._loadAngles()
self._anglesCallback(self, self._roll, self._pitch, self._head)
return 0
def nextGyro(self):
"""
Continues the enumeration of gyroscopes started using yFirstGyro().
@return a pointer to a YGyro object, corresponding to
a gyroscope currently online, or a None pointer
if there are no more gyroscopes to enumerate.
"""
hwidRef = YRefParam()
if YAPI.YISERR(self._nextFunction(hwidRef)):
return None
if hwidRef.value == "":
return None
return YGyro.FindGyro(hwidRef.value)
#--- (end of generated code: YGyro implementation)
#--- (generated code: Gyro functions)
@staticmethod
def FirstGyro():
"""
Starts the enumeration of gyroscopes currently accessible.
Use the method YGyro.nextGyro() to iterate on
next gyroscopes.
@return a pointer to a YGyro object, corresponding to
the first gyro currently online, or a None pointer
if there are none.
"""
devRef = YRefParam()
neededsizeRef = YRefParam()
serialRef = YRefParam()
funcIdRef = YRefParam()
funcNameRef = YRefParam()
funcValRef = YRefParam()
errmsgRef = YRefParam()
size = YAPI.C_INTSIZE
#noinspection PyTypeChecker,PyCallingNonCallable
p = (ctypes.c_int * 1)()
err = YAPI.apiGetFunctionsByClass("Gyro", 0, p, size, neededsizeRef, errmsgRef)
if YAPI.YISERR(err) or not neededsizeRef.value:
return None
if YAPI.YISERR(
YAPI.yapiGetFunctionInfo(p[0], devRef, serialRef, funcIdRef, funcNameRef, funcValRef, errmsgRef)):
return None
return YGyro.FindGyro(serialRef.value + "." + funcIdRef.value)
#--- (end of generated code: Gyro functions)

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