embassy_stm32/adc/
mod.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
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
//! Analog to Digital Converter (ADC)

#![macro_use]
#![allow(missing_docs)] // TODO
#![cfg_attr(adc_f3_v2, allow(unused))]

#[cfg(not(any(adc_f3_v2)))]
#[cfg_attr(adc_f1, path = "f1.rs")]
#[cfg_attr(adc_f3, path = "f3.rs")]
#[cfg_attr(adc_f3_v1_1, path = "f3_v1_1.rs")]
#[cfg_attr(adc_v1, path = "v1.rs")]
#[cfg_attr(adc_l0, path = "v1.rs")]
#[cfg_attr(adc_v2, path = "v2.rs")]
#[cfg_attr(any(adc_v3, adc_g0, adc_h5, adc_u0), path = "v3.rs")]
#[cfg_attr(any(adc_v4, adc_u5), path = "v4.rs")]
#[cfg_attr(adc_g4, path = "g4.rs")]
mod _version;

use core::marker::PhantomData;

#[allow(unused)]
#[cfg(not(any(adc_f3_v2)))]
pub use _version::*;
#[cfg(any(adc_f1, adc_f3, adc_v1, adc_l0, adc_f3_v1_1))]
use embassy_sync::waitqueue::AtomicWaker;

#[cfg(adc_u5)]
#[path = "u5_adc4.rs"]
pub mod adc4;

pub use crate::pac::adc::vals;
#[cfg(not(any(adc_f1, adc_f3_v2)))]
pub use crate::pac::adc::vals::Res as Resolution;
pub use crate::pac::adc::vals::SampleTime;
use crate::peripherals;

dma_trait!(RxDma, Instance);
#[cfg(adc_u5)]
dma_trait!(RxDma4, adc4::Instance);

/// Analog to Digital driver.
pub struct Adc<'d, T: Instance> {
    #[allow(unused)]
    adc: crate::PeripheralRef<'d, T>,
    #[cfg(not(any(adc_f3_v2, adc_f3_v1_1)))]
    sample_time: SampleTime,
}

#[cfg(any(adc_f1, adc_f3, adc_v1, adc_l0, adc_f3_v1_1))]
pub struct State {
    pub waker: AtomicWaker,
}

#[cfg(any(adc_f1, adc_f3, adc_v1, adc_l0, adc_f3_v1_1))]
impl State {
    pub const fn new() -> Self {
        Self {
            waker: AtomicWaker::new(),
        }
    }
}

trait SealedInstance {
    #[allow(unused)]
    fn regs() -> crate::pac::adc::Adc;
    #[cfg(not(any(adc_f1, adc_v1, adc_l0, adc_f3_v2, adc_f3_v1_1, adc_g0)))]
    #[allow(unused)]
    fn common_regs() -> crate::pac::adccommon::AdcCommon;
    #[cfg(any(adc_f1, adc_f3, adc_v1, adc_l0, adc_f3_v1_1))]
    fn state() -> &'static State;
}

pub(crate) trait SealedAdcChannel<T> {
    #[cfg(any(adc_v1, adc_l0, adc_v2, adc_g4, adc_v4, adc_u5))]
    fn setup(&mut self) {}

    #[allow(unused)]
    fn channel(&self) -> u8;
}

/// Performs a busy-wait delay for a specified number of microseconds.
#[allow(unused)]
pub(crate) fn blocking_delay_us(us: u32) {
    #[cfg(feature = "time")]
    embassy_time::block_for(embassy_time::Duration::from_micros(us as u64));
    #[cfg(not(feature = "time"))]
    {
        let freq = unsafe { crate::rcc::get_freqs() }.sys.to_hertz().unwrap().0 as u64;
        let us = us as u64;
        let cycles = freq * us / 1_000_000;
        cortex_m::asm::delay(cycles as u32);
    }
}

/// ADC instance.
#[cfg(not(any(
    adc_f1,
    adc_v1,
    adc_l0,
    adc_v2,
    adc_v3,
    adc_v4,
    adc_g4,
    adc_f3,
    adc_f3_v1_1,
    adc_g0,
    adc_u0,
    adc_h5,
    adc_u5
)))]
#[allow(private_bounds)]
pub trait Instance: SealedInstance + crate::Peripheral<P = Self> {
    type Interrupt: crate::interrupt::typelevel::Interrupt;
}
/// ADC instance.
#[cfg(any(
    adc_f1,
    adc_v1,
    adc_l0,
    adc_v2,
    adc_v3,
    adc_v4,
    adc_g4,
    adc_f3,
    adc_f3_v1_1,
    adc_g0,
    adc_u0,
    adc_h5,
    adc_u5
))]
#[allow(private_bounds)]
pub trait Instance: SealedInstance + crate::Peripheral<P = Self> + crate::rcc::RccPeripheral {
    type Interrupt: crate::interrupt::typelevel::Interrupt;
}

/// ADC channel.
#[allow(private_bounds)]
pub trait AdcChannel<T>: SealedAdcChannel<T> + Sized {
    #[allow(unused_mut)]
    fn degrade_adc(mut self) -> AnyAdcChannel<T> {
        #[cfg(any(adc_v1, adc_l0, adc_v2, adc_g4, adc_v4, adc_u5))]
        self.setup();

        AnyAdcChannel {
            channel: self.channel(),
            _phantom: PhantomData,
        }
    }
}

/// A type-erased channel for a given ADC instance.
///
/// This is useful in scenarios where you need the ADC channels to have the same type, such as
/// storing them in an array.
pub struct AnyAdcChannel<T> {
    channel: u8,
    _phantom: PhantomData<T>,
}

impl<T: Instance> AdcChannel<T> for AnyAdcChannel<T> {}
impl<T: Instance> SealedAdcChannel<T> for AnyAdcChannel<T> {
    fn channel(&self) -> u8 {
        self.channel
    }
}

#[cfg(adc_u5)]
foreach_adc!(
    (ADC4, $common_inst:ident, $clock:ident) => {
        impl crate::adc::adc4::SealedInstance for peripherals::ADC4 {
            fn regs() -> crate::pac::adc::Adc4 {
                crate::pac::ADC4
            }
        }

        impl crate::adc::adc4::Instance for peripherals::ADC4 {
            type Interrupt = crate::_generated::peripheral_interrupts::ADC4::GLOBAL;
        }
    };

    ($inst:ident, $common_inst:ident, $clock:ident) => {
        impl crate::adc::SealedInstance for peripherals::$inst {
            fn regs() -> crate::pac::adc::Adc {
                crate::pac::$inst
            }

            fn common_regs() -> crate::pac::adccommon::AdcCommon {
                return crate::pac::$common_inst
            }
        }

        impl crate::adc::Instance for peripherals::$inst {
            type Interrupt = crate::_generated::peripheral_interrupts::$inst::GLOBAL;
        }
    };
);

#[cfg(not(adc_u5))]
foreach_adc!(
    ($inst:ident, $common_inst:ident, $clock:ident) => {
        impl crate::adc::SealedInstance for peripherals::$inst {
            fn regs() -> crate::pac::adc::Adc {
                crate::pac::$inst
            }

            #[cfg(not(any(adc_f1, adc_v1, adc_l0, adc_f3_v2, adc_f3_v1_1, adc_g0)))]
            fn common_regs() -> crate::pac::adccommon::AdcCommon {
                return crate::pac::$common_inst
            }

            #[cfg(any(adc_f1, adc_f3, adc_v1, adc_l0, adc_f3_v1_1))]
            fn state() -> &'static State {
                static STATE: State = State::new();
                &STATE
            }
        }

        impl crate::adc::Instance for peripherals::$inst {
            type Interrupt = crate::_generated::peripheral_interrupts::$inst::GLOBAL;
        }
    };
);

macro_rules! impl_adc_pin {
    ($inst:ident, $pin:ident, $ch:expr) => {
        impl crate::adc::AdcChannel<peripherals::$inst> for crate::peripherals::$pin {}
        impl crate::adc::SealedAdcChannel<peripherals::$inst> for crate::peripherals::$pin {
            #[cfg(any(adc_v1, adc_l0, adc_v2, adc_g4, adc_v4, adc_u5))]
            fn setup(&mut self) {
                <Self as crate::gpio::SealedPin>::set_as_analog(self);
            }

            fn channel(&self) -> u8 {
                $ch
            }
        }
    };
}

/// Get the maximum reading value for this resolution.
///
/// This is `2**n - 1`.
#[cfg(not(any(adc_f1, adc_f3_v2)))]
pub const fn resolution_to_max_count(res: Resolution) -> u32 {
    match res {
        #[cfg(adc_v4)]
        Resolution::BITS16 => (1 << 16) - 1,
        #[cfg(any(adc_v4, adc_u5))]
        Resolution::BITS14 => (1 << 14) - 1,
        #[cfg(adc_v4)]
        Resolution::BITS14V => (1 << 14) - 1,
        #[cfg(adc_v4)]
        Resolution::BITS12V => (1 << 12) - 1,
        Resolution::BITS12 => (1 << 12) - 1,
        Resolution::BITS10 => (1 << 10) - 1,
        Resolution::BITS8 => (1 << 8) - 1,
        #[cfg(any(adc_v1, adc_v2, adc_v3, adc_l0, adc_g0, adc_f3, adc_f3_v1_1, adc_h5))]
        Resolution::BITS6 => (1 << 6) - 1,
        #[allow(unreachable_patterns)]
        _ => core::unreachable!(),
    }
}