程序下载成功可以用，但是 KEIL 无法下载

Core/Src/main.c

@@ -65,11 +65,11 @@ void delay_us(uint32_t nus)
 {
     uint32_t ticks;
     uint32_t told, tnow, tcnt = 0;
-    uint32_t reload = SysTick->LOAD;        /* LOADµÄÖµ */
-    ticks = nus * g_fac_us;                 /* ÐèÒªµÄ½ÚÅÄÊý */
+    uint32_t reload = SysTick->LOAD;        
+    ticks = nus * g_fac_us;                 
     
 
-    told = SysTick->VAL;                    /* ¸Õ½øÈëʱµÄ¼ÆÊýÆ÷Öµ */
+    told = SysTick->VAL;                    
     while (1)
     {
         tnow = SysTick->VAL;
@@ -77,7 +77,7 @@ void delay_us(uint32_t nus)
         {
             if (tnow < told)
             {
-                tcnt += told - tnow;        /* ÕâÀï×¢ÒâÒ»ÏÂSYSTICKÊÇÒ»¸öµÝ¼õµÄ¼ÆÊýÆ÷¾Í¿ÉÒÔÁË */
+                tcnt += told - tnow;       
             }
             else
             {
@@ -86,7 +86,7 @@ void delay_us(uint32_t nus)
             told = tnow;
             if (tcnt >= ticks) 
             {
-                break;                      /* ʱ¼ä³¬¹ý/µÈÓÚÒªÑÓ³ÙµÄʱ¼ä,ÔòÍ˳ö */
+                break;                      
             }
         }
     }
@@ -125,7 +125,7 @@ int main(void)
   /* Initialize all configured peripherals */
   MX_GPIO_Init();
   /* USER CODE BEGIN 2 */
-    delay_init(84);
+  delay_init(84);
   /* USER CODE END 2 */
 
   /* Infinite loop */
@@ -133,8 +133,8 @@ int main(void)
   while (1)
   {
     /* USER CODE END WHILE */
-      HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_4);
-      HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_5);
+      HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_4);
+      HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_5);
       delay_ms(500);
     /* USER CODE BEGIN 3 */
   }