From 0591b2bcd457cd7e383544bc5ad18f7c41621ad2 Mon Sep 17 00:00:00 2001
From: Martin Kojtal <0xc0170@gmail.com>
Date: Mon, 26 Jun 2017 15:20:54 +0100
Subject: [PATCH] STM32: fix us ticker set event timestamp

While we are handling new timestamp, disable ticker's interrupt.
---
 targets/TARGET_STM/us_ticker_32b.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/targets/TARGET_STM/us_ticker_32b.c b/targets/TARGET_STM/us_ticker_32b.c
index 90ce35aad1a..f00705234a9 100644
--- a/targets/TARGET_STM/us_ticker_32b.c
+++ b/targets/TARGET_STM/us_ticker_32b.c
@@ -44,14 +44,16 @@ uint32_t us_ticker_read()
 void us_ticker_set_interrupt(timestamp_t timestamp)
 {
     TimMasterHandle.Instance = TIM_MST;
+    // disable IT while we are handling the correct timestamp
+    __HAL_TIM_DISABLE_IT(&TimMasterHandle, TIM_IT_CC1);
     // Set new output compare value
     __HAL_TIM_SET_COMPARE(&TimMasterHandle, TIM_CHANNEL_1, (uint32_t)timestamp);
-    // Enable IT
-    __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC1);
     // Check if timestamp has already passed, and if so, set the event immediately
     if ((int32_t)(timestamp - TIM_MST->CNT) <= 0) {
         LL_TIM_GenerateEvent_CC1(TimMasterHandle.Instance);
     }
+    // Enable IT
+    __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC1);
 }
 
 void us_ticker_disable_interrupt(void)