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

// Licensed under the Apache License, Version 2.0 or the MIT License.
// SPDX-License-Identifier: Apache-2.0 OR MIT
// Copyright Tock Contributors 2022.

//! Virtual ADC Capsule
//!
//! Support Single Sample for now.

use kernel::collections::list::{List, ListLink, ListNode};
use kernel::hil;
use kernel::utilities::cells::OptionalCell;
use kernel::ErrorCode;

/// ADC Mux
pub struct MuxAdc<'a, A: hil::adc::Adc<'a>> {
    adc: &'a A,
    devices: List<'a, AdcDevice<'a, A>>,
    inflight: OptionalCell<&'a AdcDevice<'a, A>>,
}

impl<'a, A: hil::adc::Adc<'a>> hil::adc::Client for MuxAdc<'a, A> {
    fn sample_ready(&self, sample: u16) {
        self.inflight.take().map(|inflight| {
            for node in self.devices.iter() {
                if node.channel == inflight.channel {
                    node.operation.take().map(|operation| match operation {
                        Operation::OneSample => {
                            node.client.map(|client| client.sample_ready(sample))
                        }
                    });
                }
            }
        });
        self.do_next_op();
    }
}

impl<'a, A: hil::adc::Adc<'a>> MuxAdc<'a, A> {
    pub const fn new(adc: &'a A) -> MuxAdc<'a, A> {
        MuxAdc {
            adc: adc,
            devices: List::new(),
            inflight: OptionalCell::empty(),
        }
    }

    fn do_next_op(&self) {
        if self.inflight.is_none() {
            let mnode = self.devices.iter().find(|node| node.operation.is_some());
            mnode.map(|node| {
                let started = node.operation.map_or(false, |operation| match operation {
                    Operation::OneSample => {
                        let _ = self.adc.sample(&node.channel);
                        true
                    }
                });
                if started {
                    self.inflight.set(node);
                } else {
                    self.do_next_op();
                }
            });
        }
    }

    pub fn get_resolution_bits(&self) -> usize {
        self.adc.get_resolution_bits()
    }

    pub fn get_voltage_reference_mv(&self) -> Option<usize> {
        self.adc.get_voltage_reference_mv()
    }
}

#[derive(Copy, Clone, PartialEq)]
pub(crate) enum Operation {
    OneSample,
}

/// Virtual ADC device
pub struct AdcDevice<'a, A: hil::adc::Adc<'a>> {
    mux: &'a MuxAdc<'a, A>,
    channel: A::Channel,
    operation: OptionalCell<Operation>,
    next: ListLink<'a, AdcDevice<'a, A>>,
    client: OptionalCell<&'a dyn hil::adc::Client>,
}

impl<'a, A: hil::adc::Adc<'a>> AdcDevice<'a, A> {
    pub const fn new(mux: &'a MuxAdc<'a, A>, channel: A::Channel) -> AdcDevice<'a, A> {
        let adc_user = AdcDevice {
            mux: mux,
            channel: channel,
            operation: OptionalCell::empty(),
            next: ListLink::empty(),
            client: OptionalCell::empty(),
        };
        adc_user
    }

    pub fn add_to_mux(&'a self) {
        self.mux.devices.push_head(self);
    }
}

impl<'a, A: hil::adc::Adc<'a>> ListNode<'a, AdcDevice<'a, A>> for AdcDevice<'a, A> {
    fn next(&'a self) -> &'a ListLink<'a, AdcDevice<'a, A>> {
        &self.next
    }
}

impl<'a, A: hil::adc::Adc<'a>> hil::adc::AdcChannel<'a> for AdcDevice<'a, A> {
    fn sample(&self) -> Result<(), ErrorCode> {
        self.operation.set(Operation::OneSample);
        self.mux.do_next_op();
        Ok(())
    }

    fn stop_sampling(&self) -> Result<(), ErrorCode> {
        self.operation.clear();
        self.mux.do_next_op();
        Ok(())
    }

    fn sample_continuous(&self) -> Result<(), ErrorCode> {
        Err(ErrorCode::NOSUPPORT)
    }

    fn get_resolution_bits(&self) -> usize {
        self.mux.get_resolution_bits()
    }

    fn get_voltage_reference_mv(&self) -> Option<usize> {
        self.mux.get_voltage_reference_mv()
    }
    fn set_client(&self, client: &'a dyn hil::adc::Client) {
        self.client.set(client);
    }
}