[bsp][stm32f1xx-hal]修复当开启优化时m3_m4_delay_us延时失效问题

lymzzyh · lymzzyh · commit 0893e542930b · 2018-10-11T16:42:13.000+08:00
diff --git 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)

Original file line number	Diff line number	Diff line change
`@@ -115,11 +115,12 @@ void SystemClock_Config(void)`
`115`	`115`
`116`	`116`	`static void m3_m4_delay_us(rt_uint32_t us)`
`117`	`117`	`{`
`118`		`- int i = (HAL_RCC_GetHCLKFreq() / 4000000 * us);`
`119`		`- while (i)`
	`118`	`+ __IO uint32_t Delay = us * (SystemCoreClock / 8U / 1000000U);`
	`119`	`+ do`
`120`	`120`	`{`
`121`		`- i--;`
`122`		`- }`
	`121`	`+ __NOP();`
	`122`	`+ }`
	`123`	`+ while (Delay --);`
`123`	`124`	`}`
`124`	`125`
`125`	`126`	`void HAL_Delay(__IO uint32_t Delay)`