From ecba84321f8013781d36913b0f37fa7867e5cac9 Mon Sep 17 00:00:00 2001
From: Blinningjr <nicke.l@telia.com>
Date: Wed, 2 Dec 2020 17:51:52 +0100
Subject: [PATCH] rtt_timing F
---
examples/rtt_timing.rs | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/examples/rtt_timing.rs b/examples/rtt_timing.rs
index 13796fa..52fc758 100644
--- a/examples/rtt_timing.rs
+++ b/examples/rtt_timing.rs
@@ -1,6 +1,6 @@
//! examples/rtt_timing.rs
-#![deny(unsafe_code)]
+// #![deny(unsafe_code)]
#![deny(warnings)]
#![no_main]
#![no_std]
@@ -22,6 +22,9 @@ const APP: () = {
cx.core.DWT.enable_cycle_counter();
rprintln!("start timed_loop");
+ unsafe {
+ cx.core.DWT.cyccnt.write(0);
+ }
let (start, end) = timed_loop();
rprintln!(
"start {}, end {}, diff {}",
@@ -348,9 +351,10 @@ fn timed_loop() -> (u32, u32) {
// (when hitting the `timed_loop` breakpoint)?
//
// [Your answer here]
+// 0x00000009
//
// ------------------------------------------------------------------------
-// F) Finally some statics
+// G) Finally some statics
// For embedded it is often/typically crucial to reduce overhead,
// - code footprint (flash memory)
// - memory footprint (sram memory)
--
GitLab