#*********************************************************************
#*
#* $Id: yocto_voltage.py 19610 2015-03-05 10:39:47Z seb $
#*
#* Implements yFindVoltage(), the high-level API for Voltage functions
#*
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__docformat__ = 'restructuredtext en'
from yoctopuce.yocto_api import *


#--- (YVoltage class start)
#noinspection PyProtectedMember
class YVoltage(YSensor):
    """
    The Yoctopuce class YVoltage allows you to read and configure Yoctopuce voltage
    sensors. It inherits from YSensor class the core functions to read measurements,
    register callback functions, access to the autonomous datalogger.

    """
#--- (end of YVoltage class start)
    #--- (YVoltage return codes)
    #--- (end of YVoltage return codes)
    #--- (YVoltage dlldef)
    #--- (end of YVoltage dlldef)
    #--- (YVoltage definitions)
    #--- (end of YVoltage definitions)

    def __init__(self, func):
        super(YVoltage, self).__init__(func)
        self._className = 'Voltage'
        #--- (YVoltage attributes)
        self._callback = None
        #--- (end of YVoltage attributes)

    #--- (YVoltage implementation)
    def _parseAttr(self, member):
        super(YVoltage, self)._parseAttr(member)

    @staticmethod
    def FindVoltage(func):
        """
        Retrieves a voltage sensor 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 voltage sensor is online at the time
        it is invoked. The returned object is nevertheless valid.
        Use the method YVoltage.isOnline() to test if the voltage sensor is
        indeed online at a given time. In case of ambiguity when looking for
        a voltage sensor 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 voltage sensor

        @return a YVoltage object allowing you to drive the voltage sensor.
        """
        # obj
        obj = YFunction._FindFromCache("Voltage", func)
        if obj is None:
            obj = YVoltage(func)
            YFunction._AddToCache("Voltage", func, obj)
        return obj

    def nextVoltage(self):
        """
        Continues the enumeration of voltage sensors started using yFirstVoltage().

        @return a pointer to a YVoltage object, corresponding to
                a voltage sensor currently online, or a None pointer
                if there are no more voltage sensors to enumerate.
        """
        hwidRef = YRefParam()
        if YAPI.YISERR(self._nextFunction(hwidRef)):
            return None
        if hwidRef.value == "":
            return None
        return YVoltage.FindVoltage(hwidRef.value)

#--- (end of YVoltage implementation)

#--- (Voltage functions)

    @staticmethod
    def FirstVoltage():
        """
        Starts the enumeration of voltage sensors currently accessible.
        Use the method YVoltage.nextVoltage() to iterate on
        next voltage sensors.

        @return a pointer to a YVoltage object, corresponding to
                the first voltage sensor 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("Voltage", 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 YVoltage.FindVoltage(serialRef.value + "." + funcIdRef.value)

#--- (end of Voltage functions)
