|
1
|
|
|
from libAnt.core import lazyproperty |
|
2
|
|
|
from libAnt.profiles.profile import ProfileMessage |
|
3
|
|
|
|
|
4
|
|
|
|
|
5
|
|
|
class PowerProfileMessage(ProfileMessage): |
|
6
|
|
|
""" Message from Power Meter """ |
|
7
|
|
|
|
|
8
|
|
|
maxAccumulatedPower = 65536 |
|
9
|
|
|
maxEventCount = 256 |
|
10
|
|
|
|
|
11
|
|
|
def __str__(self): |
|
12
|
|
|
return super().__str__() + ' Power: ' + str(self.averagePower) |
|
13
|
|
|
|
|
14
|
|
|
@lazyproperty |
|
15
|
|
|
def dataPageNumber(self): |
|
16
|
|
|
""" |
|
17
|
|
|
:return: Data Page Number (int) |
|
18
|
|
|
""" |
|
19
|
|
|
return self.msg.content[0] |
|
20
|
|
|
|
|
21
|
|
|
@lazyproperty |
|
22
|
|
|
def eventCount(self): |
|
23
|
|
|
""" |
|
24
|
|
|
The update event count field is incremented each time the information in the message is updated. |
|
25
|
|
|
There are no invalid values for update event count. |
|
26
|
|
|
The update event count in this message refers to updates of the standard Power-Only main data page (0x10) |
|
27
|
|
|
:return: Power Event Count |
|
28
|
|
|
""" |
|
29
|
|
|
return self.msg.content[1] |
|
30
|
|
|
|
|
31
|
|
|
@lazyproperty |
|
32
|
|
|
def instantaneousCadence(self): |
|
33
|
|
|
""" |
|
34
|
|
|
The instantaneous cadence field is used to transmit the pedaling cadence recorded from the power sensor. |
|
35
|
|
|
This field is an instantaneous value only; it does not accumulate between messages. |
|
36
|
|
|
:return: Instantaneous Cadence (W) |
|
37
|
|
|
""" |
|
38
|
|
|
return self.msg.content[3] |
|
39
|
|
|
|
|
40
|
|
|
@lazyproperty |
|
41
|
|
|
def accumulatedPower(self): |
|
42
|
|
|
""" |
|
43
|
|
|
Accumulated power is the running sum of the instantaneous power data and is incremented at each update |
|
44
|
|
|
of the update event count. The accumulated power field rolls over at 65.535kW. |
|
45
|
|
|
:return: |
|
46
|
|
|
""" |
|
47
|
|
|
return (self.msg.content[5] << 8) | self.msg.content[4] |
|
48
|
|
|
|
|
49
|
|
|
@lazyproperty |
|
50
|
|
|
def instantaneousPower(self): |
|
51
|
|
|
""" Instantaneous power (W) """ |
|
52
|
|
|
return (self.msg.content[7] << 8) | self.msg.content[6] |
|
53
|
|
|
|
|
54
|
|
|
@lazyproperty |
|
55
|
|
|
def accumulatedPowerDiff(self): |
|
56
|
|
|
if self.previous is None: |
|
57
|
|
|
return None |
|
58
|
|
|
elif self.accumulatedPower < self.previous.accumulatedPower: |
|
59
|
|
|
# Rollover |
|
60
|
|
|
return (self.accumulatedPower - self.previous.accumulatedPower) + self.maxAccumulatedPower |
|
61
|
|
|
else: |
|
62
|
|
|
return self.accumulatedPower - self.previous.accumulatedPower |
|
63
|
|
|
|
|
64
|
|
|
@lazyproperty |
|
65
|
|
|
def eventCountDiff(self): |
|
66
|
|
|
if self.previous is None: |
|
67
|
|
|
return None |
|
68
|
|
|
elif self.eventCount < self.previous.eventCount: |
|
69
|
|
|
# Rollover |
|
70
|
|
|
return (self.eventCount - self.previous.eventCount) + self.maxEventCount |
|
71
|
|
|
else: |
|
72
|
|
|
return self.eventCount - self.previous.eventCount |
|
73
|
|
|
|
|
74
|
|
|
@lazyproperty |
|
75
|
|
|
def averagePower(self): |
|
76
|
|
|
""" |
|
77
|
|
|
Under normal conditions with complete RF reception, average power equals instantaneous power. |
|
78
|
|
|
In conditions where packets are lost, average power accurately calculates power over the interval |
|
79
|
|
|
between the received messages |
|
80
|
|
|
:return: Average power (Watts) |
|
81
|
|
|
""" |
|
82
|
|
|
if self.previous is None: |
|
83
|
|
|
return self.instantaneousPower |
|
84
|
|
|
if self.eventCount == self.previous.eventCount: |
|
85
|
|
|
return self.instantaneousPower |
|
86
|
|
|
return self.accumulatedPowerDiff / self.eventCountDiff |
|
87
|
|
|
|
half2me /
libant
