82 lines
2.6 KiB
Rust
82 lines
2.6 KiB
Rust
use embassy_hal_common::into_ref;
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use super::{Channel, ConfigurableChannel, Event, Ppi, Task};
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use crate::{pac, Peripheral};
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const DPPI_ENABLE_BIT: u32 = 0x8000_0000;
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const DPPI_CHANNEL_MASK: u32 = 0x0000_00FF;
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pub(crate) fn regs() -> &'static pac::dppic::RegisterBlock {
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unsafe { &*pac::DPPIC::ptr() }
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}
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impl<'d, C: ConfigurableChannel> Ppi<'d, C, 1, 1> {
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/// Configure PPI channel to trigger `task` on `event`.
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pub fn new_one_to_one(ch: impl Peripheral<P = C> + 'd, event: Event, task: Task) -> Self {
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Ppi::new_many_to_many(ch, [event], [task])
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}
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}
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impl<'d, C: ConfigurableChannel> Ppi<'d, C, 1, 2> {
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/// Configure PPI channel to trigger both `task1` and `task2` on `event`.
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pub fn new_one_to_two(ch: impl Peripheral<P = C> + 'd, event: Event, task1: Task, task2: Task) -> Self {
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Ppi::new_many_to_many(ch, [event], [task1, task2])
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}
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}
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impl<'d, C: ConfigurableChannel, const EVENT_COUNT: usize, const TASK_COUNT: usize>
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Ppi<'d, C, EVENT_COUNT, TASK_COUNT>
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{
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/// Configure a DPPI channel to trigger all `tasks` when any of the `events` fires.
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pub fn new_many_to_many(
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ch: impl Peripheral<P = C> + 'd,
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events: [Event; EVENT_COUNT],
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tasks: [Task; TASK_COUNT],
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) -> Self {
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into_ref!(ch);
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let val = DPPI_ENABLE_BIT | (ch.number() as u32 & DPPI_CHANNEL_MASK);
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for task in tasks {
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if unsafe { task.subscribe_reg().read_volatile() } != 0 {
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panic!("Task is already in use");
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}
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unsafe { task.subscribe_reg().write_volatile(val) }
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}
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for event in events {
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if unsafe { event.publish_reg().read_volatile() } != 0 {
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panic!("Event is already in use");
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}
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unsafe { event.publish_reg().write_volatile(val) }
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}
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Self { ch, events, tasks }
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}
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}
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impl<'d, C: Channel, const EVENT_COUNT: usize, const TASK_COUNT: usize> Ppi<'d, C, EVENT_COUNT, TASK_COUNT> {
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/// Enables the channel.
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pub fn enable(&mut self) {
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let n = self.ch.number();
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regs().chenset.write(|w| unsafe { w.bits(1 << n) });
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}
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/// Disables the channel.
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pub fn disable(&mut self) {
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let n = self.ch.number();
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regs().chenclr.write(|w| unsafe { w.bits(1 << n) });
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}
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}
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impl<'d, C: Channel, const EVENT_COUNT: usize, const TASK_COUNT: usize> Drop for Ppi<'d, C, EVENT_COUNT, TASK_COUNT> {
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fn drop(&mut self) {
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self.disable();
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for task in self.tasks {
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unsafe { task.subscribe_reg().write_volatile(0) }
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}
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for event in self.events {
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unsafe { event.publish_reg().write_volatile(0) }
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}
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}
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}
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