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from libAnt.core import lazyproperty |
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from libAnt.profiles.factory import ProfileMessage |
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class PowerProfileMessage(ProfileMessage): |
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""" Message from Power Meter """ |
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maxAccumulatedPower = 65536 |
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maxEventCount = 256 |
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@lazyproperty |
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def dataPageNumber(self): |
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""" |
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:return: Data Page Number (int) |
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""" |
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return self.msg.content[0] |
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@lazyproperty |
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def eventCount(self): |
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""" |
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The update event count field is incremented each time the information in the message is updated. |
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There are no invalid values for update event count. |
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The update event count in this message refers to updates of the standard Power-Only main data page (0x10) |
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:return: Power Event Count |
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""" |
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return self.msg.content[1] |
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@lazyproperty |
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def instantaneousCadence(self): |
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""" |
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The instantaneous cadence field is used to transmit the pedaling cadence recorded from the power sensor. |
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This field is an instantaneous value only; it does not accumulate between messages. |
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:return: Instantaneous Cadence (W) |
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""" |
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return self.msg.content[3] |
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@lazyproperty |
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def accumulatedPower(self): |
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""" |
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Accumulated power is the running sum of the instantaneous power data and is incremented at each update |
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of the update event count. The accumulated power field rolls over at 65.535kW. |
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:return: |
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""" |
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return (self.msg.content[5] << 8) | self.msg.content[4] |
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@lazyproperty |
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def instantaneousPower(self): |
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""" Instantaneous power (W) """ |
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return (self.msg.content[7] << 8) | self.msg.content[6] |
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@lazyproperty |
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def accumulatedPowerDiff(self): |
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if self.previous is None: |
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return None |
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elif self.accumulatedPower < self.previous.accumulatedPower: |
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# Rollover |
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return (self.accumulatedPower - self.previous.accumulatedPower) + self.maxAccumulatedPower |
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else: |
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return self.accumulatedPower - self.previous.accumulatedPower |
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@lazyproperty |
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def eventCountDiff(self): |
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if self.previous is None: |
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return None |
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elif self.eventCount < self.previous.eventCount: |
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# Rollover |
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return (self.eventCount - self.previous.eventCount) + self.maxEventCount |
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else: |
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return self.eventCount - self.previous.eventCount |
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@lazyproperty |
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def averagePower(self): |
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""" |
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Under normal conditions with complete RF reception, average power equals instantaneous power. |
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In conditions where packets are lost, average power accurately calculates power over the interval |
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between the received messages |
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:return: Average power (Watts) |
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""" |
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if self.previous is None: |
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return self.instantaneousPower |
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if self.eventCount == self.previous.eventCount: |
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return self.instantaneousPower |
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return self.accumulatedPowerDiff / self.eventCountDiff |
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half2me /
libant
