From 9d46a1c27d4dc9dd4df06b76a1d81684519d8acc Mon Sep 17 00:00:00 2001
From: Roger Clark <roger@rogerclark.net>
Date: Sat, 23 Jun 2018 17:00:17 +1000
Subject: [PATCH] Alternative fix for issue #532

---
 STM32F1/system/libmaple/include/libmaple/delay.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/STM32F1/system/libmaple/include/libmaple/delay.h b/STM32F1/system/libmaple/include/libmaple/delay.h
index 472a208..64bb510 100644
--- a/STM32F1/system/libmaple/include/libmaple/delay.h
+++ b/STM32F1/system/libmaple/include/libmaple/delay.h
@@ -46,6 +46,10 @@ extern "C" {
  * @param us Number of microseconds to delay.
  */
 static inline void delay_us(uint32 us) {
+	if (us==0)
+	{
+		return;
+	}
     us *= STM32_DELAY_US_MULT;
 
     /* fudge for function call overhead  */