From af4fed51ae3777758c09ea1d7235e8848c1f754e Mon Sep 17 00:00:00 2001
From: cscherr <Christoph.Scherr@newtec.de>
Date: Thu, 24 Apr 2025 12:25:44 +0200
Subject: [PATCH] refactor: use a proper delay instead of a useless for loop

It blinks every 500ms or so!
---
 Cargo.lock  |  1 +
 Cargo.toml  |  1 +
 src/main.rs | 19 +++++++++----------
 3 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index 9c979f3..1161d32 100755
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -123,6 +123,7 @@ checksum = "8d5439c4ad607c3c23abf66de8c8bf57ba8adcd1f129e699851a6e43935d339d"
 name = "nucleo-l053r8-blink"
 version = "0.1.0"
 dependencies = [
+ "cortex-m",
  "cortex-m-rt",
  "panic-halt",
  "stm32l0xx-hal",
diff --git a/Cargo.toml b/Cargo.toml
index 0778c4c..5f86f78 100755
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -5,6 +5,7 @@ edition = "2024"
 
 
 [dependencies]
+cortex-m = "0.7.7"
 cortex-m-rt = "0.7.5"
 panic-halt = "1.0.0"
 stm32l0xx-hal = { version = "0.10.0", features = [
diff --git a/src/main.rs b/src/main.rs
index dce6abf..ffd83f8 100755
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,4 +1,3 @@
-#![deny(unsafe_code)]
 #![no_main]
 #![no_std]
 
@@ -10,6 +9,7 @@ use stm32l0xx_hal::{pac, prelude::*, rcc::Config};
 #[entry]
 fn main() -> ! {
     let dp = pac::Peripherals::take().unwrap();
+    let cp = cortex_m::Peripherals::take().unwrap();
 
     // Configure the clock.
     let mut rcc = dp.RCC.freeze(Config::hsi16());
@@ -21,15 +21,14 @@ fn main() -> ! {
     // Configure PA1 as output.
     let mut led = gpioa.pa5.into_push_pull_output();
 
-    loop {
-        // Set the LED high one million times in a row.
-        for _ in 0..1_000_000 {
-            led.set_high().unwrap();
-        }
+    // Get the delay provider.
+    let mut delay = cp.SYST.delay(rcc.clocks);
 
-        // Set the LED low one million times in a row.
-        for _ in 0..1_000_000 {
-            led.set_low().unwrap();
-        }
+    loop {
+        led.set_high().unwrap();
+        delay.delay_ms(500_u16);
+
+        led.set_low().unwrap();
+        delay.delay_ms(500_u16);
     }
 }