Update drv_flash_f1.c

1、【修改】运算方式，更加简洁易懂；
2、【修正】代码格式 tab、 LOG_D；
3、【增加】返回值；
4、【去除】bank1_flag和bank2_flag，改用bank_size判定。

bsp/stm32/libraries/HAL_Drivers/drv_flash/drv_flash_f1.c

@@ -155,7 +155,7 @@ int stm32_flash_erase_bank(uint32_t bank, rt_uint32_t addr, size_t size)
     EraseInitStruct.PageAddress = GetPage(addr);
     EraseInitStruct.NbPages     = (size + FLASH_PAGE_SIZE - 1) / FLASH_PAGE_SIZE;
     EraseInitStruct.Banks       = bank;
-	
+    
     if (HAL_FLASHEx_Erase(&EraseInitStruct, &PAGEError) != HAL_OK)
     {
         result = -RT_ERROR;
@@ -170,7 +170,7 @@ __exit:
         return result;
     }
 
-    log_d("erase done: addr (0x%p), size %d", (void *)addr, size);
+    LOG_D("erase done: addr (0x%p), size %d", (void *)addr, size);
     return size;
 }
 
@@ -186,75 +186,58 @@ __exit:
  */
 int stm32_flash_erase(rt_uint32_t addr, size_t size)
 {
-    rt_err_t result = RT_EOK;
-	
-#if defined(FLASH_BANK2_END)		
-    uint32_t addr_bank1 = 0;
-    uint32_t size_bank1 = 0;
-    uint32_t addr_bank2 = 0;
-    uint32_t size_bank2 = 0;
-    uint8_t  bank1_flag = 0;
-    uint8_t  bank2_flag = 0;
-#endif
-    
-#if defined(FLASH_BANK2_END)	
-	
-    if(addr <= FLASH_BANK1_END)
+#if defined(FLASH_BANK2_END)    
+    rt_err_t result = RT_EOK;   
+    rt_uint32_t addr_bank1 = 0;
+    rt_uint32_t size_bank1 = 0;
+    rt_uint32_t addr_bank2 = 0;
+    rt_uint32_t size_bank2 = 0;
+
+    if((addr + size) <= FLASH_BANK1_END)
     {
         addr_bank1 = addr;
-        bank1_flag = 1;
-          
-        if((addr + size) > FLASH_BANK1_END)
-        {
-            addr_bank2 = FLASH_BANK1_END + 1;
-            size_bank2 = addr + size - (FLASH_BANK1_END + 1);
-          
-            if(size_bank2)
-            {
-                bank2_flag = 1;
-            }
-          
-                size_bank1 = FLASH_BANK1_END + 1 - addr_bank1;
-        }
-        else
-        {
-            size_bank1 = size;
-        }
+        size_bank1 = size;
+        size_bank2 = 0;
+    }
+    else if(addr > FLASH_BANK1_END)
+    {
+        size_bank1 = 0;
+        addr_bank2 = addr;
+        size_bank2 = size; 
     }
     else
     {
-    	addr_bank2 = addr;
-    	size_bank2 = size;
-    	bank1_flag = 0;
-    	bank2_flag = 1;
+        addr_bank1 = addr;
+        size_bank1 = FLASH_BANK1_END + 1 - addr_bank1;
+        addr_bank2 = FLASH_BANK1_END + 1;
+        size_bank2 = addr + size - (FLASH_BANK1_END + 1);
     }
-    
-    if(bank1_flag)
+
+    if(size_bank1)
     {
-    	log_d("bank1: addr (0x%p), size %d", (void *)addr_bank1, size_bank1);
-    
-    	if(size_bank1 != stm32_flash_erase_bank(FLASH_BANK_1, addr_bank1, size_bank1))
-    	{
+        LOG_D("bank1: addr (0x%p), size %d", (void *)addr_bank1, size_bank1);
+        if(size_bank1 != stm32_flash_erase_bank(FLASH_BANK_1, addr_bank1, size_bank1))
+        {
             result = -RT_ERROR;
-    	}
+        }
     }
     
-    if(bank2_flag)
+    if(size_bank2)
     {
-    	log_d("bank2: addr (0x%p), size %d", (void *)addr_bank2, size_bank2);
-    
-    	if(size_bank2 != stm32_flash_erase_bank(FLASH_BANK_2, addr_bank2, size_bank2))
-    	{
+        LOG_D("bank2: addr (0x%p), size %d", (void *)addr_bank2, size_bank2);
+        if(size_bank2 != stm32_flash_erase_bank(FLASH_BANK_2, addr_bank2, size_bank2))
+        {
             result = -RT_ERROR;
-    	}
+        }
     }
     
-return result;
+    return size_bank1 + size_bank2;
 #else
     return stm32_flash_erase_bank(FLASH_BANK_1, addr, size);
 #endif
 }
 
+
 #if defined(PKG_USING_FAL)
 
 static int fal_flash_read(long offset, rt_uint8_t *buf, size_t size);