add HAL and example for using nRF EGU peripheral

1 files changed, 55 insertions, 0 deletions

diff --git a/examples/nrf52840/src/bin/egu.rs b/examples/nrf52840/src/bin/egu.rs
new file mode 100644
index 000000000..df96f7e56
--- /dev/null
+++ b/examples/nrf52840/src/bin/egu.rs
@@ -0,0 +1,55 @@
+//! This example shows the use of the EGU peripheral combined with PPI.
+//!
+//! It chains events from button -> egu0-trigger0 -> egu0-trigger1 -> led
+#![no_std]
+#![no_main]
+
+use embassy_executor::Spawner;
+use embassy_nrf::gpio::{Input, Level, Output, OutputDrive, Pull};
+use embassy_nrf::gpiote::{InputChannel, InputChannelPolarity, OutputChannel, OutputChannelPolarity};
+use embassy_nrf::peripherals::{PPI_CH0, PPI_CH1, PPI_CH2};
+use embassy_nrf::ppi::Ppi;
+use embassy_nrf::egu::{Egu, TriggerNumber};
+use embassy_time::{Duration, Timer};
+use {defmt_rtt as _, panic_probe as _};
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    let p = embassy_nrf::init(Default::default());
+
+    let led1 = Output::new(p.P0_13, Level::High, OutputDrive::Standard);
+    let btn1 = Input::new(p.P0_11, Pull::Up);
+
+    let mut egu1 = Egu::new(p.EGU0);
+    let led1 = OutputChannel::new(p.GPIOTE_CH0, led1, OutputChannelPolarity::Toggle);
+    let btn1 = InputChannel::new(p.GPIOTE_CH1, btn1, InputChannelPolarity::LoToHi);
+
+    let trigger0 = egu1.trigger(TriggerNumber::Trigger0);
+    let trigger1 = egu1.trigger(TriggerNumber::Trigger1);
+
+    let mut ppi1: Ppi<PPI_CH0, 1, 1> = Ppi::new_one_to_one(
+        p.PPI_CH0,
+        btn1.event_in(),
+        trigger0.task(),
+    );
+    ppi1.enable();
+
+    let mut ppi2: Ppi<PPI_CH1, 1, 1> = Ppi::new_one_to_one(
+        p.PPI_CH1,
+        trigger0.event(),
+        trigger1.task(),
+    );
+    ppi2.enable();
+
+    let mut ppi3: Ppi<PPI_CH2, 1, 1> = Ppi::new_one_to_one(
+        p.PPI_CH2,
+        trigger1.event(),
+        led1.task_out(),
+    );
+    ppi3.enable();
+
+    defmt::info!("Push the button to toggle the LED");
+    loop {
+        Timer::after(Duration::from_secs(60)).await;
+    }
+}