From a8dc17a6cfe9e678ba37b2cf9073ebfd25841405 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=89milie=20Feral?= <emilie.feral@numworks.com>
Date: Wed, 17 Jan 2018 15:21:24 +0100
Subject: [PATCH] [ion] Add TODO on implementations of usleep msleep

---
 ion/src/device/device.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/ion/src/device/device.cpp b/ion/src/device/device.cpp
index 20b006599..23daf95f9 100644
--- a/ion/src/device/device.cpp
+++ b/ion/src/device/device.cpp
@@ -19,6 +19,10 @@ extern "C" {
 
 // Public Ion methods
 
+/* TODO: The delay methods 'msleep' and 'usleep' are currently dependent on the
+ * optimizations chosen by the compiler. To prevent that and to gain in
+ * precision, we could use the controller cycle counter (Systick). */
+
 void Ion::msleep(long ms) {
   for (volatile long i=0; i<8852*ms; i++) {
       __asm volatile("nop");