-
Notifications
You must be signed in to change notification settings - Fork 623
/
v2.rs
211 lines (177 loc) · 5.66 KB
/
v2.rs
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
use embassy_hal_internal::into_ref;
use super::blocking_delay_us;
use crate::adc::{Adc, AdcPin, Instance, Resolution, SampleTime};
use crate::peripherals::ADC1;
use crate::time::Hertz;
use crate::Peripheral;
/// Default VREF voltage used for sample conversion to millivolts.
pub const VREF_DEFAULT_MV: u32 = 3300;
/// VREF voltage used for factory calibration of VREFINTCAL register.
pub const VREF_CALIB_MV: u32 = 3300;
pub struct VrefInt;
impl AdcPin<ADC1> for VrefInt {}
impl super::SealedAdcPin<ADC1> for VrefInt {
fn channel(&self) -> u8 {
17
}
}
impl VrefInt {
/// Time needed for internal voltage reference to stabilize
pub fn start_time_us() -> u32 {
10
}
}
pub struct Temperature;
impl AdcPin<ADC1> for Temperature {}
impl super::SealedAdcPin<ADC1> for Temperature {
fn channel(&self) -> u8 {
cfg_if::cfg_if! {
if #[cfg(any(stm32f2, stm32f40, stm32f41))] {
16
} else {
18
}
}
}
}
impl Temperature {
/// Time needed for temperature sensor readings to stabilize
pub fn start_time_us() -> u32 {
10
}
}
pub struct Vbat;
impl AdcPin<ADC1> for Vbat {}
impl super::SealedAdcPin<ADC1> for Vbat {
fn channel(&self) -> u8 {
18
}
}
enum Prescaler {
Div2,
Div4,
Div6,
Div8,
}
impl Prescaler {
fn from_pclk2(freq: Hertz) -> Self {
// Datasheet for F2 specifies min frequency 0.6 MHz, and max 30 MHz (with VDDA 2.4-3.6V).
#[cfg(stm32f2)]
const MAX_FREQUENCY: Hertz = Hertz(30_000_000);
// Datasheet for both F4 and F7 specifies min frequency 0.6 MHz, typ freq. 30 MHz and max 36 MHz.
#[cfg(not(stm32f2))]
const MAX_FREQUENCY: Hertz = Hertz(36_000_000);
let raw_div = freq.0 / MAX_FREQUENCY.0;
match raw_div {
0..=1 => Self::Div2,
2..=3 => Self::Div4,
4..=5 => Self::Div6,
6..=7 => Self::Div8,
_ => panic!("Selected PCLK2 frequency is too high for ADC with largest possible prescaler."),
}
}
fn adcpre(&self) -> crate::pac::adccommon::vals::Adcpre {
match self {
Prescaler::Div2 => crate::pac::adccommon::vals::Adcpre::DIV2,
Prescaler::Div4 => crate::pac::adccommon::vals::Adcpre::DIV4,
Prescaler::Div6 => crate::pac::adccommon::vals::Adcpre::DIV6,
Prescaler::Div8 => crate::pac::adccommon::vals::Adcpre::DIV8,
}
}
}
impl<'d, T> Adc<'d, T>
where
T: Instance,
{
pub fn new(adc: impl Peripheral<P = T> + 'd) -> Self {
into_ref!(adc);
T::enable_and_reset();
let presc = Prescaler::from_pclk2(T::frequency());
T::common_regs().ccr().modify(|w| w.set_adcpre(presc.adcpre()));
T::regs().cr2().modify(|reg| {
reg.set_adon(true);
});
blocking_delay_us(3);
Self {
adc,
sample_time: SampleTime::from_bits(0),
}
}
pub fn set_sample_time(&mut self, sample_time: SampleTime) {
self.sample_time = sample_time;
}
pub fn set_resolution(&mut self, resolution: Resolution) {
T::regs().cr1().modify(|reg| reg.set_res(resolution.into()));
}
/// Enables internal voltage reference and returns [VrefInt], which can be used in
/// [Adc::read_internal()] to perform conversion.
pub fn enable_vrefint(&self) -> VrefInt {
T::common_regs().ccr().modify(|reg| {
reg.set_tsvrefe(true);
});
VrefInt {}
}
/// Enables internal temperature sensor and returns [Temperature], which can be used in
/// [Adc::read_internal()] to perform conversion.
///
/// On STM32F42 and STM32F43 this can not be used together with [Vbat]. If both are enabled,
/// temperature sensor will return vbat value.
pub fn enable_temperature(&self) -> Temperature {
T::common_regs().ccr().modify(|reg| {
reg.set_tsvrefe(true);
});
Temperature {}
}
/// Enables vbat input and returns [Vbat], which can be used in
/// [Adc::read_internal()] to perform conversion.
pub fn enable_vbat(&self) -> Vbat {
T::common_regs().ccr().modify(|reg| {
reg.set_vbate(true);
});
Vbat {}
}
/// Perform a single conversion.
fn convert(&mut self) -> u16 {
// clear end of conversion flag
T::regs().sr().modify(|reg| {
reg.set_eoc(false);
});
// Start conversion
T::regs().cr2().modify(|reg| {
reg.set_swstart(true);
});
while T::regs().sr().read().strt() == false {
// spin //wait for actual start
}
while T::regs().sr().read().eoc() == false {
// spin //wait for finish
}
T::regs().dr().read().0 as u16
}
pub fn read(&mut self, pin: &mut impl AdcPin<T>) -> u16 {
pin.set_as_analog();
// Configure ADC
let channel = pin.channel();
// Select channel
T::regs().sqr3().write(|reg| reg.set_sq(0, channel));
// Configure channel
Self::set_channel_sample_time(channel, self.sample_time);
self.convert()
}
fn set_channel_sample_time(ch: u8, sample_time: SampleTime) {
let sample_time = sample_time.into();
if ch <= 9 {
T::regs().smpr2().modify(|reg| reg.set_smp(ch as _, sample_time));
} else {
T::regs().smpr1().modify(|reg| reg.set_smp((ch - 10) as _, sample_time));
}
}
}
impl<'d, T: Instance> Drop for Adc<'d, T> {
fn drop(&mut self) {
T::regs().cr2().modify(|reg| {
reg.set_adon(false);
});
T::disable();
}
}