From 0893e542930b1f0c81a4e2cc0893939a08c456bf Mon Sep 17 00:00:00 2001
From: ZYH <lymz@foxmail.com>
Date: Thu, 11 Oct 2018 11:38:04 +0800
Subject: [PATCH] =?UTF-8?q?[bsp][stm32f1xx-hal]=E4=BF=AE=E5=A4=8D=E5=BD=93?=
 =?UTF-8?q?=E5=BC=80=E5=90=AF=E4=BC=98=E5=8C=96=E6=97=B6m3=5Fm4=5Fdelay=5F?=
 =?UTF-8?q?us=E5=BB=B6=E6=97=B6=E5=A4=B1=E6=95=88=E9=97=AE=E9=A2=98?=
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---
 bsp/stm32f10x-HAL/drivers/board.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/bsp/stm32f10x-HAL/drivers/board.c b/bsp/stm32f10x-HAL/drivers/board.c
index 7ce0503f9..5c7e44c4f 100644
--- a/bsp/stm32f10x-HAL/drivers/board.c
+++ b/bsp/stm32f10x-HAL/drivers/board.c
@@ -115,11 +115,12 @@ void SystemClock_Config(void)
 
 static void m3_m4_delay_us(rt_uint32_t us)
 {
-    int i = (HAL_RCC_GetHCLKFreq() / 4000000 * us);
-    while (i)
+    __IO uint32_t Delay = us * (SystemCoreClock / 8U / 1000000U);
+    do 
     {
-        i--;
-    }
+        __NOP();
+    } 
+    while (Delay --);
 }
 
 void HAL_Delay(__IO uint32_t Delay)
-- 
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