1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
use std::fmt;
use error::*;
use utils::read_stringz;
/// Measurement unit.
#[allow(non_camel_case_types)]
#[derive(Clone, Copy, PartialEq, Eq, Debug)]
pub enum Unit {
/// Volts, direct current
VDC,
/// Volts, alternating current
VAC,
/// Volts, AC+DC
VAcDc,
/// Ampers, direct current
ADC,
/// Ampers, alternating current
AAC,
/// Ampers, AC+DC
AAcDc,
/// Celsius degrees
Celsius,
/// Fahrenheit degrees
Fahrenheit,
/// Farad
F,
/// Hertz
Hz,
/// seconds
s,
/// Percents
Percent,
/// Siemens
S,
/// Ohms
Ohm,
/// Decibels referenced to 1 milliwatt
dBm,
/// Decibels referenced to 1 Volt
dBV,
}
#[derive(Clone, Copy, Debug)]
pub struct UnitExp {
pub unit: Unit,
pub exponent: isize,
}
impl UnitExp {
/// Returns unit and decimal exponent.
pub(crate) fn from_bin(data: &[u8]) -> Result<UnitExp> {
match read_stringz(data).as_ref() {
"mVDC" => Ok(UnitExp {
unit: Unit::VDC,
exponent: -3,
}),
"VDC" | "V" => Ok(UnitExp {
unit: Unit::VDC,
exponent: 0,
}),
"mVAC" => Ok(UnitExp {
unit: Unit::VAC,
exponent: -3,
}),
"VAC" => Ok(UnitExp {
unit: Unit::VAC,
exponent: 0,
}),
"mVac+dc" => Ok(UnitExp {
unit: Unit::VAcDc,
exponent: -3,
}),
"Vac+dc" => Ok(UnitExp {
unit: Unit::VAcDc,
exponent: 0,
}),
"uADC" => Ok(UnitExp {
unit: Unit::ADC,
exponent: -6,
}),
"mADC" => Ok(UnitExp {
unit: Unit::ADC,
exponent: -3,
}),
"ADC" => Ok(UnitExp {
unit: Unit::ADC,
exponent: 0,
}),
"uAAC" => Ok(UnitExp {
unit: Unit::AAC,
exponent: -6,
}),
"mAAC" => Ok(UnitExp {
unit: Unit::AAC,
exponent: -3,
}),
"AAC" => Ok(UnitExp {
unit: Unit::AAC,
exponent: 0,
}),
"uAac+dc" => Ok(UnitExp {
unit: Unit::AAcDc,
exponent: -6,
}),
"mAac+dc" => Ok(UnitExp {
unit: Unit::AAcDc,
exponent: -3,
}),
"Aac+dc" => Ok(UnitExp {
unit: Unit::AAcDc,
exponent: 0,
}),
"\u{FFFD}C" => Ok(UnitExp {
unit: Unit::Celsius,
exponent: 0,
}),
"\u{FFFD}F" => Ok(UnitExp {
unit: Unit::Fahrenheit,
exponent: 0,
}),
"Hz" => Ok(UnitExp {
unit: Unit::Hz,
exponent: 0,
}),
"kHz" => Ok(UnitExp {
unit: Unit::Hz,
exponent: 3,
}),
"MHz" => Ok(UnitExp {
unit: Unit::Hz,
exponent: 6,
}),
"ms" => Ok(UnitExp {
unit: Unit::s,
exponent: -3,
}),
"%" => Ok(UnitExp {
unit: Unit::Percent,
exponent: 0,
}),
"nS" => Ok(UnitExp {
unit: Unit::S,
exponent: -9,
}),
"~" => Ok(UnitExp {
unit: Unit::Ohm,
exponent: 0,
}),
"k~" => Ok(UnitExp {
unit: Unit::Ohm,
exponent: 3,
}),
"M~" => Ok(UnitExp {
unit: Unit::Ohm,
exponent: 6,
}),
"dBm" => Ok(UnitExp {
unit: Unit::dBm,
exponent: 0,
}),
"dBV" => Ok(UnitExp {
unit: Unit::dBV,
exponent: 0,
}),
"nF" => Ok(UnitExp {
unit: Unit::F,
exponent: -9,
}),
"uF" => Ok(UnitExp {
unit: Unit::F,
exponent: -6,
}),
"mF" => Ok(UnitExp {
unit: Unit::F,
exponent: -3,
}),
unt => Err(ErrorKind::UnknownMeasurementUnit(unt.into()).into()),
}
}
}
impl fmt::Display for UnitExp {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let prefix = match self.exponent {
-12 => "p",
-9 => "n",
-6 => "u",
-3 => "m",
0 => "",
3 => "k",
6 => "M",
9 => "G",
_ => return Err(fmt::Error),
};
let unit = match self.unit {
Unit::VDC => "VDC",
Unit::VAC => "VAC",
Unit::VAcDc => "Vac+dc",
Unit::ADC => "ADC",
Unit::AAC => "AAC",
Unit::AAcDc => "Aac+dc",
Unit::Celsius => "C",
Unit::Fahrenheit | Unit::F => "F",
Unit::Hz => "Hz",
Unit::s => "s",
Unit::Percent => "%",
Unit::S => "S",
Unit::Ohm => "Ohm",
Unit::dBm => "dBm",
Unit::dBV => "dBV",
};
write!(f, "{}{}", prefix, unit)
}
}