From ee668cce81f97645ba84d93efe565e81cd8a80b4 Mon Sep 17 00:00:00 2001
From: ericQiang <sddzycnq@gmail.com>
Date: Mon, 9 Sep 2019 22:22:29 +0800
Subject: [PATCH] bug fix: the value of timer auto reload should be (val-1)

---
 bsp/stm32/libraries/HAL_Drivers/drv_hwtimer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/bsp/stm32/libraries/HAL_Drivers/drv_hwtimer.c b/bsp/stm32/libraries/HAL_Drivers/drv_hwtimer.c
index 24e91cd690..52fa5c84fa 100644
--- a/bsp/stm32/libraries/HAL_Drivers/drv_hwtimer.c
+++ b/bsp/stm32/libraries/HAL_Drivers/drv_hwtimer.c
@@ -228,7 +228,7 @@ static rt_err_t timer_start(rt_hwtimer_t *timer, rt_uint32_t t, rt_hwtimer_mode_
     tim = (TIM_HandleTypeDef *)timer->parent.user_data;
 
     /* set tim cnt */
-    __HAL_TIM_SET_AUTORELOAD(tim, t);
+    __HAL_TIM_SET_AUTORELOAD(tim, t - 1);
 
     if (opmode == HWTIMER_MODE_ONESHOT)
     {