From 340eb6eb0d3fb47f5d968c323c92943662457fda Mon Sep 17 00:00:00 2001
From: Brian Cully <bjc@kublai.com>
Date: Sat, 6 Aug 2022 13:06:59 -0400
Subject: =?UTF-8?q?Put=20blink=20in=20separate=20=E2=80=98Task=E2=80=99=20?=
 =?UTF-8?q?struct.?=
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---
 src/blink.rs | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 src/blink.rs

(limited to 'src/blink.rs')

diff --git a/src/blink.rs b/src/blink.rs
new file mode 100644
index 0000000..7c992d7
--- /dev/null
+++ b/src/blink.rs
@@ -0,0 +1,54 @@
+use crate::{PollResult, led::LED};
+
+use gd32vf103xx_hal::prelude::_embedded_hal_timer_CountDown;
+
+use gd32vf103xx_hal::{
+    eclic::{self, EclicExt},
+    pac::{self, Interrupt},
+    time::Hertz,
+    timer,
+};
+
+enum State {
+    WaitForTimer,
+    ToggleLED,
+}
+
+pub struct Task {
+    timer: timer::Timer<pac::TIMER6>,
+    frequency: Hertz,
+    led: LED,
+    state: State,
+}
+
+impl Task {
+    pub fn new(mut timer: timer::Timer<pac::TIMER6>, frequency: Hertz, led: LED) -> Self {
+        pac::ECLIC::setup(Interrupt::TIMER6, eclic::TriggerType::RisingEdge, eclic::Level::L0, eclic::Priority::P3);
+        unsafe { pac::ECLIC::unmask(Interrupt::TIMER6); }
+        if !pac::ECLIC::is_enabled(Interrupt::TIMER6) {
+            panic!("timer6 interrupt not enabled");
+        }
+        timer.listen(timer::Event::Update);
+
+        Self { timer, frequency, led, state: State::ToggleLED }
+    }
+
+    pub fn poll(&mut self) -> PollResult {
+        match self.state {
+            State::WaitForTimer => {
+                if let Ok(_) = self.timer.wait() {
+                    self.state = State::ToggleLED;
+                    PollResult::Ok
+                } else {
+                    PollResult::WouldBlock
+                }
+            },
+            State::ToggleLED => {
+                self.led.toggle();
+                self.timer.start(self.frequency);
+                self.state = State::WaitForTimer;
+                PollResult::WouldBlock
+            }
+        }
+    }
+}
-- 
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