From f66b9f10f387e468e3cfb96517beb17911941b3d Mon Sep 17 00:00:00 2001
From: Roger Clark <roger@rogerclark.net>
Date: Sun, 10 Dec 2017 17:07:57 +1100
Subject: [PATCH] Hopefully fixed problem with tone() blocking when it should
 be non-blocking

---
 STM32F1/cores/maple/tone.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/STM32F1/cores/maple/tone.cpp b/STM32F1/cores/maple/tone.cpp
index 45cfa0e..b249a78 100644
--- a/STM32F1/cores/maple/tone.cpp
+++ b/STM32F1/cores/maple/tone.cpp
@@ -186,7 +186,8 @@ void tone(uint32_t pin, uint32_t freq, uint32_t duration) {
       pinMode(tone_pin, INPUT);
 
    }
-   while(tone_nhw) ; // blocks till duration elapsed
+   
+   //while(tone_nhw) ; // blocks till duration elapsed
 }
 
 ////////////////////////////////////////////////////////////////////////////////