From 8c1cb71bbe54301b711519267d40bf854f6fcf1f Mon Sep 17 00:00:00 2001
From: Brian Cully <bjc@kublai.com>
Date: Mon, 8 Aug 2022 15:05:31 -0400
Subject: =?UTF-8?q?use=20=E2=80=98nb=E2=80=99=20crate=20instead=20of=20cus?=
 =?UTF-8?q?tom=20type?=
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---
 src/blink.rs | 15 +++++++++------
 src/main.rs  | 18 +++++++-----------
 2 files changed, 16 insertions(+), 17 deletions(-)

diff --git a/src/blink.rs b/src/blink.rs
index 7c992d7..8e17b21 100644
--- a/src/blink.rs
+++ b/src/blink.rs
@@ -1,13 +1,16 @@
-use crate::{PollResult, led::LED};
-
 use gd32vf103xx_hal::prelude::_embedded_hal_timer_CountDown;
 
+use core::convert::Infallible;
+
 use gd32vf103xx_hal::{
     eclic::{self, EclicExt},
     pac::{self, Interrupt},
     time::Hertz,
     timer,
 };
+use nb;
+
+use crate::led::LED;
 
 enum State {
     WaitForTimer,
@@ -33,21 +36,21 @@ impl Task {
         Self { timer, frequency, led, state: State::ToggleLED }
     }
 
-    pub fn poll(&mut self) -> PollResult {
+    pub fn poll(&mut self) -> nb::Result<(), Infallible> {
         match self.state {
             State::WaitForTimer => {
                 if let Ok(_) = self.timer.wait() {
                     self.state = State::ToggleLED;
-                    PollResult::Ok
+                    Ok(())
                 } else {
-                    PollResult::WouldBlock
+                    Err(nb::Error::WouldBlock)
                 }
             },
             State::ToggleLED => {
                 self.led.toggle();
                 self.timer.start(self.frequency);
                 self.state = State::WaitForTimer;
-                PollResult::WouldBlock
+                Err(nb::Error::WouldBlock)
             }
         }
     }
diff --git a/src/main.rs b/src/main.rs
index 707feed..6cb4139 100755
--- a/src/main.rs
+++ b/src/main.rs
@@ -25,12 +25,6 @@ use led::LED;
 
 // global_asm!(include_str!("boot.S"));
 
-#[derive(PartialEq)]
-pub enum PollResult {
-    Ok,
-    WouldBlock,
-}
-
 #[entry]
 fn main(_hartid: usize) -> ! {
     let p = Peripherals::take().expect("couldn't take peripherals");
@@ -40,11 +34,7 @@ fn main(_hartid: usize) -> ! {
 
     let mut rcu = p.RCU.configure().freeze();
     let mut afio = p.AFIO.constrain(&mut rcu);
-
-    let timer = Timer::<pac::TIMER6>::timer6(p.TIMER6, Hertz(1), &mut rcu);
     let gpioa = p.GPIOA.split(&mut rcu);
-    let led = LED::new(gpioa.pa7);
-    let mut blink = blink::Task::new(timer, Hertz(5), led);
 
     // TODO: figure out how to use the usb serial on the start board.
     //
@@ -59,10 +49,16 @@ fn main(_hartid: usize) -> ! {
     let (tx, _rx) = serial.split();
     log::init(tx);
 
+    let timer = Timer::<pac::TIMER6>::timer6(p.TIMER6, Hertz(1), &mut rcu);
+    let led = LED::new(gpioa.pa7);
+    let mut blink = blink::Task::new(timer, Hertz(5), led);
+
     loop {
         let mut can_sleep = true;
 
-        can_sleep &= blink.poll() == PollResult::WouldBlock;
+        if let Ok(_) = blink.poll() {
+            can_sleep = false;
+        }
         log!("yo!");
         logln!(" mtv raps");
 
-- 
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