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use embassy_hal_internal::into_ref;
use super::{Channel, ConfigurableChannel, Event, Ppi, Task};
use crate::{pac, Peripheral};
const DPPI_ENABLE_BIT: u32 = 0x8000_0000;
const DPPI_CHANNEL_MASK: u32 = 0x0000_00FF;
pub(crate) fn regs() -> &'static pac::dppic::RegisterBlock {
unsafe { &*pac::DPPIC::ptr() }
}
impl<'d, C: ConfigurableChannel> Ppi<'d, C, 1, 1> {
/// Configure PPI channel to trigger `task` on `event`.
pub fn new_one_to_one(ch: impl Peripheral<P = C> + 'd, 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: impl Peripheral<P = C> + 'd, 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: impl Peripheral<P = C> + 'd,
events: [Event<'d>; EVENT_COUNT],
tasks: [Task<'d>; TASK_COUNT],
) -> Self {
into_ref!(ch);
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| unsafe { w.bits(1 << n) });
}
/// Disables the channel.
pub fn disable(&mut self) {
let n = self.ch.number();
regs().chenclr.write(|w| unsafe { w.bits(1 << n) });
}
}
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) }
}
}
}
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