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
|
use super::{Channel, ConfigurableChannel, Event, Ppi, Task};
use crate::{Peri, pac};
const DPPI_ENABLE_BIT: u32 = 0x8000_0000;
const DPPI_CHANNEL_MASK: u32 = 0x0000_00FF;
pub(crate) fn regs() -> pac::dppic::Dppic {
pac::DPPIC
}
impl<'d, C: ConfigurableChannel> Ppi<'d, C, 1, 1> {
/// Configure PPI channel to trigger `task` on `event`.
pub fn new_one_to_one(ch: Peri<'d, C>, event: Event<'d>, task: Task<'d>) -> Self {
Ppi::new_many_to_many(ch, [event], [task])
}
}
impl<'d, C: ConfigurableChannel> Ppi<'d, C, 1, 2> {
/// Configure PPI channel to trigger both `task1` and `task2` on `event`.
pub fn new_one_to_two(ch: Peri<'d, C>, event: Event<'d>, task1: Task<'d>, task2: Task<'d>) -> Self {
Ppi::new_many_to_many(ch, [event], [task1, task2])
}
}
impl<'d, C: ConfigurableChannel, const EVENT_COUNT: usize, const TASK_COUNT: usize>
Ppi<'d, C, EVENT_COUNT, TASK_COUNT>
{
/// Configure a DPPI channel to trigger all `tasks` when any of the `events` fires.
pub fn new_many_to_many(ch: Peri<'d, C>, events: [Event<'d>; EVENT_COUNT], tasks: [Task<'d>; TASK_COUNT]) -> Self {
let val = DPPI_ENABLE_BIT | (ch.number() as u32 & DPPI_CHANNEL_MASK);
for task in tasks {
if unsafe { task.subscribe_reg().read_volatile() } != 0 {
panic!("Task is already in use");
}
unsafe { task.subscribe_reg().write_volatile(val) }
}
for event in events {
if unsafe { event.publish_reg().read_volatile() } != 0 {
panic!("Event is already in use");
}
unsafe { event.publish_reg().write_volatile(val) }
}
Self { ch, events, tasks }
}
}
impl<'d, C: Channel, const EVENT_COUNT: usize, const TASK_COUNT: usize> Ppi<'d, C, EVENT_COUNT, TASK_COUNT> {
/// Enables the channel.
pub fn enable(&mut self) {
let n = self.ch.number();
regs().chenset().write(|w| w.0 = 1 << n);
}
/// Disables the channel.
pub fn disable(&mut self) {
let n = self.ch.number();
regs().chenclr().write(|w| w.0 = 1 << n);
}
}
impl<C: Channel, const EVENT_COUNT: usize, const TASK_COUNT: usize> Ppi<'static, C, EVENT_COUNT, TASK_COUNT> {
/// Persist the channel's configuration for the rest of the program's lifetime. This method
/// should be preferred over [`core::mem::forget()`] because the `'static` bound prevents
/// accidental reuse of the underlying peripheral.
pub fn persist(self) {
core::mem::forget(self);
}
}
impl<'d, C: Channel, const EVENT_COUNT: usize, const TASK_COUNT: usize> Drop for Ppi<'d, C, EVENT_COUNT, TASK_COUNT> {
fn drop(&mut self) {
self.disable();
for task in self.tasks {
unsafe { task.subscribe_reg().write_volatile(0) }
}
for event in self.events {
unsafe { event.publish_reg().write_volatile(0) }
}
}
}
|
