diff --git a/bsp/at32/Libraries/rt_drivers/drv_adc.c b/bsp/at32/Libraries/rt_drivers/drv_adc.c
index 02e7b602af..25760e512b 100644
--- a/bsp/at32/Libraries/rt_drivers/drv_adc.c
+++ b/bsp/at32/Libraries/rt_drivers/drv_adc.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -17,7 +17,7 @@
 #include <drv_log.h>
 
 struct at32_adc
-{  
+{
     struct rt_adc_device at32_adc_device;
     ADC_Type *ADC_Handler;
     char *name;
@@ -109,9 +109,9 @@ static rt_err_t at32_adc_enabled(struct rt_adc_device *device, rt_uint32_t chann
     ADC_InitType ADC_InitStructure;
     RT_ASSERT(device != RT_NULL);
     at32_adc_handler = device->parent.user_data;
-  
+
     at32_msp_adc_init(at32_adc_handler);
-  
+
     /* ADCx configuration ------------------------------------------------------*/
     ADC_StructInit(&ADC_InitStructure);
     ADC_InitStructure.ADC_Mode              = ADC_Mode_Independent;
@@ -121,14 +121,14 @@ static rt_err_t at32_adc_enabled(struct rt_adc_device *device, rt_uint32_t chann
     ADC_InitStructure.ADC_DataAlign         = ADC_DataAlign_Right;
     ADC_InitStructure.ADC_NumOfChannel      = 1;
     ADC_Init(at32_adc_handler, &ADC_InitStructure);
-  
-    /* ADCx regular channels configuration */ 
-    ADC_RegularChannelConfig(at32_adc_handler, at32_adc_get_channel(channel), 1, ADC_SampleTime_28_5); 
-    
+
+    /* ADCx regular channels configuration */
+    ADC_RegularChannelConfig(at32_adc_handler, at32_adc_get_channel(channel), 1, ADC_SampleTime_28_5);
+
     /* Enable ADCx */
     ADC_Ctrl(at32_adc_handler, ENABLE);
-  
-    /* Enable ADCx reset calibration register */   
+
+    /* Enable ADCx reset calibration register */
     ADC_RstCalibration(at32_adc_handler);
     /* Check the end of ADCx reset calibration register */
     while(ADC_GetResetCalibrationStatus(at32_adc_handler));
@@ -161,7 +161,7 @@ static rt_err_t at32_get_adc_value(struct rt_adc_device *device, rt_uint32_t cha
 
     at32_adc_handler = device->parent.user_data;
 
-    /* Start ADCx Software Conversion */ 
+    /* Start ADCx Software Conversion */
     ADC_SoftwareStartConvCtrl(at32_adc_handler, ENABLE);
 
     /* Wait for the ADC to convert */
diff --git a/bsp/at32/Libraries/rt_drivers/drv_adc.h b/bsp/at32/Libraries/rt_drivers/drv_adc.h
index d113d1338a..0991b0fe80 100644
--- a/bsp/at32/Libraries/rt_drivers/drv_adc.h
+++ b/bsp/at32/Libraries/rt_drivers/drv_adc.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -19,32 +19,32 @@ extern "C" {
 #endif
 
 #if defined(BSP_USING_ADC1) || defined(BSP_USING_ADC2) || defined(BSP_USING_ADC3)
-  
+
 #ifndef ADC1_CONFIG
 #define ADC1_CONFIG                 \
     {                              \
        .ADC_Handler = ADC1,        \
        .name        = "adc1",      \
-    }  
+    }
 #endif /* ADC1_CONFIG */
-    
+
 #ifndef ADC2_CONFIG
 #define ADC2_CONFIG                \
     {                              \
        .ADC_Handler = ADC2,        \
        .name        = "adc2",      \
-    }  
+    }
 #endif /* ADC2_CONFIG */
-    
+
 #ifndef ADC3_CONFIG
 #define ADC3_CONFIG                \
     {                              \
        .ADC_Handler = ADC3,        \
        .name        = "adc3",      \
-    }  
-#endif /* ADC3_CONFIG */    
-    
-#endif  
+    }
+#endif /* ADC3_CONFIG */
+
+#endif
 
 
 #ifdef __cplusplus
diff --git a/bsp/at32/Libraries/rt_drivers/drv_can.c b/bsp/at32/Libraries/rt_drivers/drv_can.c
index 43f5a287e3..47a4bb3667 100644
--- a/bsp/at32/Libraries/rt_drivers/drv_can.c
+++ b/bsp/at32/Libraries/rt_drivers/drv_can.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -311,8 +311,8 @@ static rt_err_t _can_control(struct rt_can_device *can, int cmd, void *arg)
             {
                 can_instance->CanConfig.FilterConfig.CAN_FilterNumber = filter_cfg->items[i].hdr & (0x1fU);
                 can_instance->CanConfig.FilterConfig.CAN_FilterIdHigh = (filter_cfg->items[i].id >> 13) & 0xFFFF;
-                can_instance->CanConfig.FilterConfig.CAN_FilterIdLow = ((filter_cfg->items[i].id << 3) | 
-                                                    (filter_cfg->items[i].ide << 2) | 
+                can_instance->CanConfig.FilterConfig.CAN_FilterIdLow = ((filter_cfg->items[i].id << 3) |
+                                                    (filter_cfg->items[i].ide << 2) |
                                                     (filter_cfg->items[i].rtr << 1)) & 0xFFFF;
                 can_instance->CanConfig.FilterConfig.CAN_FilterMskIdHigh = (filter_cfg->items[i].mask >> 16) & 0xFFFF;
                 can_instance->CanConfig.FilterConfig.CAN_FilterMskIdLow = filter_cfg->items[i].mask & 0xFFFF;
@@ -499,7 +499,7 @@ static int _can_recvmsg(struct rt_can_device *can, void *buf, rt_uint32_t fifo)
     else
         pmsg->ide = RxMessage.ExtId;
     pmsg->rtr = RxMessage.RTR;
-    
+
     return RT_EOK;
 }
 
diff --git a/bsp/at32/Libraries/rt_drivers/drv_can.h b/bsp/at32/Libraries/rt_drivers/drv_can.h
index d89bacda26..19afb93040 100644
--- a/bsp/at32/Libraries/rt_drivers/drv_can.h
+++ b/bsp/at32/Libraries/rt_drivers/drv_can.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -22,7 +22,7 @@ extern "C" {
 #define CAN_TX_MAILBOX0             (0x00000001U)  /*!< Tx Mailbox 0  */
 #define CAN_TX_MAILBOX1             (0x00000002U)  /*!< Tx Mailbox 1  */
 #define CAN_TX_MAILBOX2             (0x00000004U)  /*!< Tx Mailbox 2  */
-  
+
 struct at32_baud_rate_tab
 {
     rt_uint32_t baud_rate;
diff --git a/bsp/at32/Libraries/rt_drivers/drv_eth.c b/bsp/at32/Libraries/rt_drivers/drv_eth.c
index 3a14d9b918..e44429e0ea 100644
--- a/bsp/at32/Libraries/rt_drivers/drv_eth.c
+++ b/bsp/at32/Libraries/rt_drivers/drv_eth.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -28,8 +28,8 @@
 //#define DRV_DEBUG
 #define LOG_TAG             "drv.emac"
 
-#define ETH_RXBUFNB        	4
-#define ETH_TXBUFNB        	2
+#define ETH_RXBUFNB         4
+#define ETH_TXBUFNB         2
 
 #define LINK_THREAD_STACK_SIZE   256
 #define LINK_THREAD_PREORITY     21
@@ -131,14 +131,14 @@ void NVIC_Configuration(void)
     NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
 
     /* 2 bit for pre-emption priority, 2 bits for subpriority */
-    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); 
+    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
 
     /* Enable the Ethernet global Interrupt */
     NVIC_InitStructure.NVIC_IRQChannel = ETH_IRQn;
     NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
     NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
     NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
-    NVIC_Init(&NVIC_InitStructure);  
+    NVIC_Init(&NVIC_InitStructure);
 }
 
 /**
@@ -173,7 +173,7 @@ void GPIO_Configuration(void)
     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
     GPIO_Init(GPIOC, &GPIO_InitStructure);
 
-	/*MII Mode GPIO configuration*/
+    /*MII Mode GPIO configuration*/
 #ifdef MII_MODE
 /**********************MII Tx Pin Define****************************/
     /*
@@ -193,7 +193,7 @@ void GPIO_Configuration(void)
     GPIO_InitStructure.GPIO_MaxSpeed = GPIO_MaxSpeed_50MHz;
     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
     GPIO_Init(GPIOC, &GPIO_InitStructure);
-	/**********************MII Rx Pin Define****************************/
+    /**********************MII Rx Pin Define****************************/
 #if MII_RX_REMAP  /*IO PIN remaped*/
     /*
     ETH_MII_RX_DV-->PD8
@@ -208,7 +208,7 @@ void GPIO_Configuration(void)
     */
     GPIO_InitStructure.GPIO_Pins = GPIO_Pins_8 | GPIO_Pins_9 | GPIO_Pins_10 | GPIO_Pins_11 | GPIO_Pins_12;
     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
-    GPIO_Init(GPIOD, &GPIO_InitStructure); 
+    GPIO_Init(GPIOD, &GPIO_InitStructure);
 
     GPIO_InitStructure.GPIO_Pins = GPIO_Pins_0 | GPIO_Pins_1 | GPIO_Pins_3;
     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
@@ -233,11 +233,11 @@ void GPIO_Configuration(void)
     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
     GPIO_Init(GPIOA, &GPIO_InitStructure);
 
-    GPIO_InitStructure.GPIO_Pins = GPIO_Pins_4 | GPIO_Pins_5;   
+    GPIO_InitStructure.GPIO_Pins = GPIO_Pins_4 | GPIO_Pins_5;
     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
     GPIO_Init(GPIOC, &GPIO_InitStructure);
 
-    GPIO_InitStructure.GPIO_Pins = GPIO_Pins_0 | GPIO_Pins_1 | GPIO_Pins_10;  
+    GPIO_InitStructure.GPIO_Pins = GPIO_Pins_0 | GPIO_Pins_1 | GPIO_Pins_10;
     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
     GPIO_Init(GPIOB, &GPIO_InitStructure);
 
@@ -255,8 +255,8 @@ void GPIO_Configuration(void)
     GPIO_InitStructure.GPIO_MaxSpeed = GPIO_MaxSpeed_50MHz;
     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
     GPIO_Init(GPIOB, &GPIO_InitStructure);
-	
-	/**********************RMII Rx Pin Define****************************/
+
+    /**********************RMII Rx Pin Define****************************/
 #if MII_RX_REMAP  /*IO PIN remaped*/
     /*
     ETH_RMII_RX_DV-->PD8
@@ -266,7 +266,7 @@ void GPIO_Configuration(void)
     */
     GPIO_InitStructure.GPIO_Pins = GPIO_Pins_8 | GPIO_Pins_9 | GPIO_Pins_10;
     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
-    GPIO_Init(GPIOD, &GPIO_InitStructure); 
+    GPIO_Init(GPIOD, &GPIO_InitStructure);
 
     GPIO_InitStructure.GPIO_Pins =  GPIO_Pins_1;
     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
@@ -282,7 +282,7 @@ void GPIO_Configuration(void)
     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
     GPIO_Init(GPIOA, &GPIO_InitStructure);
 
-    GPIO_InitStructure.GPIO_Pins = GPIO_Pins_4 | GPIO_Pins_5;   
+    GPIO_InitStructure.GPIO_Pins = GPIO_Pins_4 | GPIO_Pins_5;
     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
     GPIO_Init(GPIOC, &GPIO_InitStructure);
 
@@ -314,7 +314,7 @@ static rt_err_t rt_at32_eth_init(rt_device_t dev)
 
     RCC_AHBPeriphClockCmd(RCC_AHBPERIPH_ETHMAC | RCC_AHBPERIPH_ETHMACTX |
                           RCC_AHBPERIPH_ETHMACRX, ENABLE);
-    
+
     /* MII/RMII Media interface selection ------------------------------------------*/
 #ifdef MII_MODE /* Mode MII with AT32F407-EVAL  */
     GPIO_ETH_MediaInterfaceConfig(GPIO_ETH_MediaInterface_MII);
@@ -361,31 +361,31 @@ static rt_err_t rt_at32_eth_init(rt_device_t dev)
     ETH_InitStructure.ETH_ChecksumOffload = ETH_ChecksumOffload_Enable;
 #endif
 
-    /*------------------------   DMA   -----------------------------------*/  
+    /*------------------------   DMA   -----------------------------------*/
 
-    /* When we use the Checksum offload feature, we need to enable the Store and Forward mode: 
-    the store and forward guarantee that a whole frame is stored in the FIFO, so the MAC can insert/verify the checksum, 
+    /* When we use the Checksum offload feature, we need to enable the Store and Forward mode:
+    the store and forward guarantee that a whole frame is stored in the FIFO, so the MAC can insert/verify the checksum,
     if the checksum is OK the DMA can handle the frame otherwise the frame is dropped */
-    ETH_InitStructure.ETH_DropTCPIPChecksumErrorFrame = ETH_DropTCPIPChecksumErrorFrame_Enable;//ETH_DropTCPIPChecksumErrorFrame_Enable; 
-    ETH_InitStructure.ETH_ReceiveStoreForward = ETH_ReceiveStoreForward_Enable;         
-    ETH_InitStructure.ETH_TransmitStoreForward = ETH_TransmitStoreForward_Enable;     
+    ETH_InitStructure.ETH_DropTCPIPChecksumErrorFrame = ETH_DropTCPIPChecksumErrorFrame_Enable;//ETH_DropTCPIPChecksumErrorFrame_Enable;
+    ETH_InitStructure.ETH_ReceiveStoreForward = ETH_ReceiveStoreForward_Enable;
+    ETH_InitStructure.ETH_TransmitStoreForward = ETH_TransmitStoreForward_Enable;
 
-    ETH_InitStructure.ETH_ForwardErrorFrames = ETH_ForwardErrorFrames_Disable;       
-    ETH_InitStructure.ETH_ForwardUndersizedGoodFrames = ETH_ForwardUndersizedGoodFrames_Disable;   
-    ETH_InitStructure.ETH_SecondFrameOperate = ETH_SecondFrameOperate_Enable;                                                          
-    ETH_InitStructure.ETH_AddressAlignedBeats = ETH_AddressAlignedBeats_Enable;      
-    ETH_InitStructure.ETH_FixedBurst = ETH_FixedBurst_Enable;                
-    ETH_InitStructure.ETH_RxDMABurstLength = ETH_RxDMABurstLength_32Beat;          
-    ETH_InitStructure.ETH_TxDMABurstLength = ETH_TxDMABurstLength_32Beat;                                                                 
+    ETH_InitStructure.ETH_ForwardErrorFrames = ETH_ForwardErrorFrames_Disable;
+    ETH_InitStructure.ETH_ForwardUndersizedGoodFrames = ETH_ForwardUndersizedGoodFrames_Disable;
+    ETH_InitStructure.ETH_SecondFrameOperate = ETH_SecondFrameOperate_Enable;
+    ETH_InitStructure.ETH_AddressAlignedBeats = ETH_AddressAlignedBeats_Enable;
+    ETH_InitStructure.ETH_FixedBurst = ETH_FixedBurst_Enable;
+    ETH_InitStructure.ETH_RxDMABurstLength = ETH_RxDMABurstLength_32Beat;
+    ETH_InitStructure.ETH_TxDMABurstLength = ETH_TxDMABurstLength_32Beat;
     ETH_InitStructure.ETH_DMAArbitration = ETH_DMAArbitration_RoundRobin_RxTx_2_1;
 
     /* Configure Ethernet, check error */
     if(ETH_Init(&ETH_InitStructure, PHY_ADDRESS) == ((uint32_t)0)) {
         return RT_ERROR;
-    }    
+    }
 
     /* Enable DMA Receive interrupt (need to enable in this case Normal interrupt) */
-    ETH_DMAITConfig(ETH_DMA_INT_NIS | ETH_DMA_INT_R, ENABLE);  
+    ETH_DMAITConfig(ETH_DMA_INT_NIS | ETH_DMA_INT_R, ENABLE);
 
     /* Initialize Tx Descriptors list: Chain Mode */
     ETH_DMATxDescChainInit(DMATxDscrTab, &Tx_Buff[0][0], ETH_TXBUFNB);
@@ -396,7 +396,7 @@ static rt_err_t rt_at32_eth_init(rt_device_t dev)
     ETH_MACAddressConfig(ETH_MAC_Address0, (u8*)&at32_eth_device.dev_addr[0]);
 
     /* Enable ETH transmition and recetion */
-    ETH_Start();    
+    ETH_Start();
 
     return RT_EOK;
 }
@@ -581,7 +581,7 @@ struct pbuf *rt_at32_eth_rx(rt_device_t dev)
             {
                 rt_uint32_t i;
                 rt_uint8_t *ptr = (rt_uint8_t*)(DMARxDescToGet->Buffer1Addr);
-                
+
                 AT32_ETH_PRINTF("rx_dump, len:%d\r\n", p->tot_len);
                 for(i=0; i<p->tot_len; i++)
                 {
diff --git a/bsp/at32/Libraries/rt_drivers/drv_eth.h b/bsp/at32/Libraries/rt_drivers/drv_eth.h
index 398b4bdc0c..d5a5a05cc5 100644
--- a/bsp/at32/Libraries/rt_drivers/drv_eth.h
+++ b/bsp/at32/Libraries/rt_drivers/drv_eth.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
diff --git a/bsp/at32/Libraries/rt_drivers/drv_flash.c b/bsp/at32/Libraries/rt_drivers/drv_flash.c
index 8104f9b612..a1b381beaa 100644
--- a/bsp/at32/Libraries/rt_drivers/drv_flash.c
+++ b/bsp/at32/Libraries/rt_drivers/drv_flash.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -160,14 +160,14 @@ int at32_flash_erase(rt_uint32_t addr, size_t size)
         addr += FLASH_PAGE_SIZE;
     }
 
-		FLASH_Lock();
-		
-__exit:    
+        FLASH_Lock();
+
+__exit:
     if(result != RT_EOK)
     {
         return result;
     }
-    
+
     return size;
 }
 
@@ -177,7 +177,7 @@ static int fal_flash_read(long offset, rt_uint8_t *buf, size_t size);
 static int fal_flash_write(long offset, const rt_uint8_t *buf, size_t size);
 static int fal_flash_erase(long offset, size_t size);
 
-const struct fal_flash_dev at32_onchip_flash = 
+const struct fal_flash_dev at32_onchip_flash =
 {
     "onchip_flash",
     AT32_FLASH_START_ADRESS,
diff --git a/bsp/at32/Libraries/rt_drivers/drv_flash.h b/bsp/at32/Libraries/rt_drivers/drv_flash.h
index 9392ff4303..7ec0a18632 100644
--- a/bsp/at32/Libraries/rt_drivers/drv_flash.h
+++ b/bsp/at32/Libraries/rt_drivers/drv_flash.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
diff --git a/bsp/at32/Libraries/rt_drivers/drv_gpio.c b/bsp/at32/Libraries/rt_drivers/drv_gpio.c
index d6fd0594dc..bc9f6b87bb 100644
--- a/bsp/at32/Libraries/rt_drivers/drv_gpio.c
+++ b/bsp/at32/Libraries/rt_drivers/drv_gpio.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -13,7 +13,7 @@
 
 #ifdef RT_USING_PIN
 
-static const struct pin_index pins[] = 
+static const struct pin_index pins[] =
 {
 #if defined(GPIOA)
     __AT32_PIN(0 ,  A, 0 ),
@@ -414,7 +414,7 @@ static rt_err_t at32_pin_irq_enable(struct rt_device *device, rt_base_t pin,
         /* Configure GPIO_InitStructure */
         GPIO_StructInit(&GPIO_InitStruct);
         EXTI_StructInit(&EXTI_InitStruct);
-        GPIO_InitStruct.GPIO_Pins = irqmap->pinbit;        
+        GPIO_InitStruct.GPIO_Pins = irqmap->pinbit;
         GPIO_InitStruct.GPIO_MaxSpeed = GPIO_MaxSpeed_50MHz;
         EXTI_InitStruct.EXTI_Line = irqmap->pinbit;
         EXTI_InitStruct.EXTI_Mode = EXTI_Mode_Interrupt;
@@ -462,24 +462,24 @@ static rt_err_t at32_pin_irq_enable(struct rt_device *device, rt_base_t pin,
         if (( irqmap->pinbit>=GPIO_Pins_5 )&&( irqmap->pinbit<=GPIO_Pins_9 ))
         {
             if(!(pin_irq_enable_mask&(GPIO_Pins_5|GPIO_Pins_6|GPIO_Pins_7|GPIO_Pins_8|GPIO_Pins_9)))
-            {    
+            {
                 NVIC_InitStruct.NVIC_IRQChannel = irqmap->irqno;
             }
         }
         else if (( irqmap->pinbit>=GPIO_Pins_10 )&&( irqmap->pinbit<=GPIO_Pins_15 ))
         {
             if(!(pin_irq_enable_mask&(GPIO_Pins_10|GPIO_Pins_11|GPIO_Pins_12|GPIO_Pins_13|GPIO_Pins_14|GPIO_Pins_15)))
-            {    
+            {
                 NVIC_InitStruct.NVIC_IRQChannel = irqmap->irqno;
             }
         }
         else
         {
             NVIC_InitStruct.NVIC_IRQChannel = irqmap->irqno;
-        }        
+        }
 
         NVIC_Init(&NVIC_InitStruct);
-        rt_hw_interrupt_enable(level);  
+        rt_hw_interrupt_enable(level);
     }
     else
     {
diff --git a/bsp/at32/Libraries/rt_drivers/drv_gpio.h b/bsp/at32/Libraries/rt_drivers/drv_gpio.h
index 63870611f5..a8f5b7474e 100644
--- a/bsp/at32/Libraries/rt_drivers/drv_gpio.h
+++ b/bsp/at32/Libraries/rt_drivers/drv_gpio.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
diff --git a/bsp/at32/Libraries/rt_drivers/drv_hwtimer.c b/bsp/at32/Libraries/rt_drivers/drv_hwtimer.c
index 97788d22c9..dede483e54 100644
--- a/bsp/at32/Libraries/rt_drivers/drv_hwtimer.c
+++ b/bsp/at32/Libraries/rt_drivers/drv_hwtimer.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -7,7 +7,7 @@
  * Date           Author       Notes
  * 2020-03-16     Leo          first version
  */
- 
+
 #include <board.h>
 #include "drv_hwtimer.h"
 
@@ -20,35 +20,35 @@ enum
 {
 #ifdef BSP_USING_HWTMR1
     TMR1_INDEX,
-#endif 
-  
+#endif
+
 #ifdef BSP_USING_HWTMR2
     TMR2_INDEX,
-#endif 
-  
+#endif
+
 #ifdef BSP_USING_HWTMR3
     TMR3_INDEX,
-#endif 
+#endif
 
 #ifdef BSP_USING_HWTMR4
     TMR4_INDEX,
-#endif 
+#endif
 
 #ifdef BSP_USING_HWTMR5
     TMR5_INDEX,
-#endif  
+#endif
 
 #ifdef BSP_USING_HWTMR6
     TMR6_INDEX,
-#endif  
+#endif
 
 #ifdef BSP_USING_HWTMR7
     TMR7_INDEX,
-#endif 
+#endif
 
 #ifdef BSP_USING_HW_TMR8
     TMR8_INDEX,
-#endif  
+#endif
 
 #ifdef BSP_USING_HWTMR9
     TMR9_INDEX,
@@ -56,11 +56,11 @@ enum
 
 #ifdef BSP_USING_HWTMR10
     TMR10_INDEX,
-#endif 
+#endif
 
 #ifdef BSP_USING_HWTMR11
     TMR11_INDEX,
-#endif  
+#endif
 
 #ifdef BSP_USING_HWTMR12
     TMR12_INDEX,
@@ -68,11 +68,11 @@ enum
 
 #ifdef BSP_USING_HWTMR13
     TMR13_INDEX,
-#endif 
+#endif
 
 #ifdef BSP_USING_HWTMR14
     TMR14_INDEX,
-#endif  
+#endif
 
 #ifdef BSP_USING_HWTMR15
     TMR15_INDEX,
@@ -91,48 +91,48 @@ static struct at32_hwtimer at32_hwtimer_obj[] =
 {
 #ifdef BSP_USING_HWTMR1
     TMR1_CONFIG,
-#endif  
+#endif
 
 #ifdef BSP_USING_HWTMR2
     TMR2_CONFIG,
 #endif
-  
+
 #ifdef BSP_USING_HWTMR3
     TMR3_CONFIG,
 #endif
-  
+
 #ifdef BSP_USING_HWTMR4
     TMR4_CONFIG,
 #endif
 
 #ifdef BSP_USING_HWTMR5
     TMR5_CONFIG,
-#endif 
+#endif
 
 #ifdef BSP_USING_HWTMR6
     TMR6_CONFIG,
 #endif
-  
+
 #ifdef BSP_USING_HWTMR7
     TMR7_CONFIG,
 #endif
-  
+
 #ifdef BSP_USING_HWTMR8
     TMR8_CONFIG,
 #endif
 
 #ifdef BSP_USING_HWTMR9
     TMR9_CONFIG,
-#endif 
+#endif
 
 #ifdef BSP_USING_HWTMR10
     TMR10_CONFIG,
 #endif
-  
+
 #ifdef BSP_USING_HWTMR11
     TMR11_CONFIG,
 #endif
-  
+
 #ifdef BSP_USING_HWTMR12
     TMR12_CONFIG,
 #endif
@@ -164,20 +164,20 @@ static void at32_timer_init(struct rt_hwtimer_device *timer, rt_uint32_t state)
     {
         tim = (TMR_Type *)timer->parent.user_data;
         tim_device = (struct at32_hwtimer *)timer;
-        
+
         /* timer clock enable */
         at32_msp_hwtmr_init(tim);
-        
+
         /* timer init */
         RCC_GetClocksFreq(&RCC_ClockStruct);
         /* Set timer clock is 1Mhz */
         prescaler_value = (uint32_t)(RCC_ClockStruct.SYSCLK_Freq / 10000) - 1;
-        
+
         TMR_TMReBaseStructure.TMR_Period = 10000 - 1;
         TMR_TMReBaseStructure.TMR_DIV = prescaler_value;
         TMR_TMReBaseStructure.TMR_ClockDivision = TMR_CKD_DIV1;
         TMR_TMReBaseStructure.TMR_RepetitionCounter = 0;
-        
+
         if (timer->info->cntmode == HWTIMER_CNTMODE_UP)
         {
             TMR_TMReBaseStructure.TMR_CounterMode = TMR_CounterDIR_Up;
@@ -186,21 +186,21 @@ static void at32_timer_init(struct rt_hwtimer_device *timer, rt_uint32_t state)
         {
             TMR_TMReBaseStructure.TMR_CounterMode = TMR_CounterDIR_Down;
         }
-        
+
         TMR_TimeBaseInit(tim, &TMR_TMReBaseStructure);
-        
+
         /* Enable the TMRx global Interrupt */
         NVIC_InitStructure.NVIC_IRQChannel = tim_device->tim_irqn;
         NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
         NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
         NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
         NVIC_Init(&NVIC_InitStructure);
-        
+
         TMR_INTConfig(tim, TMR_INT_Overflow ,ENABLE);
         TMR_ClearITPendingBit(tim, TMR_INT_Overflow);
-        
+
         LOG_D("%s init success", tim_device->name);
-    }      
+    }
 }
 
 static rt_err_t at32_timer_start(rt_hwtimer_t *timer, rt_uint32_t t, rt_hwtimer_mode_t opmode)
@@ -211,7 +211,7 @@ static rt_err_t at32_timer_start(rt_hwtimer_t *timer, rt_uint32_t t, rt_hwtimer_
     RT_ASSERT(timer != RT_NULL);
 
     tim = (TMR_Type *)timer->parent.user_data;
-    
+
     /* set tim cnt */
     TMR_SetCounter(tim, 0);
     /* set tim arr */
@@ -225,10 +225,10 @@ static rt_err_t at32_timer_start(rt_hwtimer_t *timer, rt_uint32_t t, rt_hwtimer_
     {
         TMR_SelectOnePulseMode(tim, TMR_OPMode_Repetitive);
     }
-    
+
     /* start timer */
     TMR_Cmd(tim, ENABLE);
-    
+
     return result;
 }
 
@@ -239,7 +239,7 @@ static void at32_timer_stop(rt_hwtimer_t *timer)
     RT_ASSERT(timer != RT_NULL);
 
     tim = (TMR_Type *)timer->parent.user_data;
-    
+
     /* stop timer */
     TMR_Cmd(tim, ENABLE);
     /* set tim cnt */
@@ -253,7 +253,7 @@ static rt_uint32_t at32_timer_counter_get(rt_hwtimer_t *timer)
     RT_ASSERT(timer != RT_NULL);
 
     tim = (TMR_Type *)timer->parent.user_data;
-    
+
     return tim->CNT;
 }
 
@@ -267,22 +267,22 @@ static rt_err_t at32_timer_ctrl(rt_hwtimer_t *timer, rt_uint32_t cmd, void *arg)
     RT_ASSERT(arg != RT_NULL);
 
     tim = (TMR_Type *)timer->parent.user_data;
-    
+
     switch(cmd)
     {
         case HWTIMER_CTRL_FREQ_SET:
         {
             rt_uint32_t freq;
             rt_uint16_t val;
-            
+
             /* set timer frequence */
             freq = *((rt_uint32_t *)arg);
-            
+
             /* time init */
             RCC_GetClocksFreq(&RCC_ClockStruct);
-            
+
             val = RCC_ClockStruct.SYSCLK_Freq / freq;
-            
+
             TMR_DIVConfig(tim, val - 1, TMR_DIVReloadMode_Immediate);
         }
         break;
@@ -292,7 +292,7 @@ static rt_err_t at32_timer_ctrl(rt_hwtimer_t *timer, rt_uint32_t cmd, void *arg)
         }
         break;
     }
-    
+
     return result;
 }
 
@@ -311,13 +311,13 @@ void TMR2_GLOBAL_IRQHandler(void)
 {
     /* enter interrupt */
     rt_interrupt_enter();
-    
+
     if(TMR_GetINTStatus(TMR2, TMR_INT_Overflow) == SET)
     {
-    
+
         rt_device_hwtimer_isr(&at32_hwtimer_obj[TMR2_INDEX].time_device);
         TMR_ClearITPendingBit(TMR2, TMR_INT_Overflow);
-    
+
     }
     /* leave interrupt */
     rt_interrupt_leave();
@@ -329,13 +329,13 @@ void TMR3_GLOBAL_IRQHandler(void)
 {
     /* enter interrupt */
     rt_interrupt_enter();
-    
+
     if(TMR_GetINTStatus(TMR3, TMR_INT_Overflow) == SET)
     {
-    
+
         rt_device_hwtimer_isr(&at32_hwtimer_obj[TMR3_INDEX].time_device);
         TMR_ClearITPendingBit(TMR3, TMR_INT_Overflow);
-    
+
     }
     /* leave interrupt */
     rt_interrupt_leave();
@@ -347,13 +347,13 @@ void TMR4_GLOBAL_IRQHandler(void)
 {
     /* enter interrupt */
     rt_interrupt_enter();
-    
+
     if(TMR_GetINTStatus(TMR4, TMR_INT_Overflow) == SET)
     {
-    
+
         rt_device_hwtimer_isr(&at32_hwtimer_obj[TMR4_INDEX].time_device);
         TMR_ClearITPendingBit(TMR4, TMR_INT_Overflow);
-    
+
     }
     /* leave interrupt */
     rt_interrupt_leave();
@@ -365,13 +365,13 @@ void TMR5_GLOBAL_IRQHandler(void)
 {
     /* enter interrupt */
     rt_interrupt_enter();
-    
+
     if(TMR_GetINTStatus(TMR5, TMR_INT_Overflow) == SET)
     {
-    
+
         rt_device_hwtimer_isr(&at32_hwtimer_obj[TMR5_INDEX].time_device);
         TMR_ClearITPendingBit(TMR5, TMR_INT_Overflow);
-    
+
     }
     /* leave interrupt */
     rt_interrupt_leave();
diff --git a/bsp/at32/Libraries/rt_drivers/drv_hwtimer.h b/bsp/at32/Libraries/rt_drivers/drv_hwtimer.h
index 9ae4981e3f..9acfb8d468 100644
--- a/bsp/at32/Libraries/rt_drivers/drv_hwtimer.h
+++ b/bsp/at32/Libraries/rt_drivers/drv_hwtimer.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -26,7 +26,7 @@ extern "C" {
         .maxcnt  = 0xFFFF,                      \
         .cntmode = HWTIMER_CNTMODE_UP,          \
     }
-#endif /* TIM_DEV_INFO_CONFIG */  
+#endif /* TIM_DEV_INFO_CONFIG */
 
 #ifdef BSP_USING_HWTMR2
 #ifndef TMR2_CONFIG
@@ -36,9 +36,9 @@ extern "C" {
        .tim_irqn      = TMR2_GLOBAL_IRQn, \
        .name          = "timer2",     \
     }
-#endif /* TMR2_CONFIG */  
-#endif /* BSP_USING_HWTMR2 */ 
-  
+#endif /* TMR2_CONFIG */
+#endif /* BSP_USING_HWTMR2 */
+
 #ifdef BSP_USING_HWTMR3
 #ifndef TMR3_CONFIG
 #define TMR3_CONFIG                   \
@@ -47,8 +47,8 @@ extern "C" {
        .tim_irqn      = TMR3_GLOBAL_IRQn, \
        .name          = "timer3",     \
     }
-#endif /* TMR3_CONFIG */  
-#endif /* BSP_USING_HWTMR3 */  
+#endif /* TMR3_CONFIG */
+#endif /* BSP_USING_HWTMR3 */
 
 #ifdef BSP_USING_HWTMR4
 #ifndef TMR4_CONFIG
@@ -58,9 +58,9 @@ extern "C" {
        .tim_irqn      = TMR4_GLOBAL_IRQn, \
        .name          = "timer4",     \
     }
-#endif /* TMR4_CONFIG */  
+#endif /* TMR4_CONFIG */
 #endif /* BSP_USING_HWTMR4 */
-    
+
 #ifdef BSP_USING_HWTMR5
 #ifndef TMR5_CONFIG
 #define TMR5_CONFIG                   \
@@ -69,9 +69,9 @@ extern "C" {
        .tim_irqn      = TMR5_GLOBAL_IRQn, \
        .name          = "timer5",     \
     }
-#endif /* TMR5_CONFIG */  
-#endif /* BSP_USING_HWTMR5 */    
-    
+#endif /* TMR5_CONFIG */
+#endif /* BSP_USING_HWTMR5 */
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/bsp/at32/Libraries/rt_drivers/drv_log.h b/bsp/at32/Libraries/rt_drivers/drv_log.h
index a813acb0cb..d91f70d37c 100644
--- a/bsp/at32/Libraries/rt_drivers/drv_log.h
+++ b/bsp/at32/Libraries/rt_drivers/drv_log.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
diff --git a/bsp/at32/Libraries/rt_drivers/drv_pwm.c b/bsp/at32/Libraries/rt_drivers/drv_pwm.c
index 78b1b2d7a9..9a188681ed 100644
--- a/bsp/at32/Libraries/rt_drivers/drv_pwm.c
+++ b/bsp/at32/Libraries/rt_drivers/drv_pwm.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -37,52 +37,52 @@ struct at32_pwm
     char *name;
 };
 
-static struct at32_pwm at32_pwm_obj[] = 
+static struct at32_pwm at32_pwm_obj[] =
 {
   #ifdef BSP_USING_TMR1_CH1
     PWM1_CONFIG,
   #endif
-  
+
   #ifdef BSP_USING_TMR1_CH2
     PWM2_CONFIG,
   #endif
-  
+
   #ifdef BSP_USING_TMR1_CH3
     PWM3_CONFIG,
   #endif
-  
+
   #ifdef BSP_USING_TMR1_CH4
     PWM4_CONFIG,
   #endif
-  
+
   #ifdef BSP_USING_TMR2_CH1
     PWM5_CONFIG,
   #endif
-  
+
   #ifdef BSP_USING_TMR2_CH2
     PWM6_CONFIG,
   #endif
-  
+
   #ifdef BSP_USING_TMR2_CH3
     PWM7_CONFIG,
   #endif
-  
+
   #ifdef BSP_USING_TMR2_CH4
     PWM8_CONFIG,
   #endif
-  
+
   #ifdef BSP_USING_TMR3_CH1
     PWM9_CONFIG,
   #endif
-  
+
   #ifdef BSP_USING_TMR3_CH2
     PWM10_CONFIG,
   #endif
-  
+
   #ifdef BSP_USING_TMR3_CH3
     PWM11_CONFIG,
   #endif
-  
+
   #ifdef BSP_USING_TMR3_CH4
     PWM12_CONFIG,
   #endif
@@ -97,7 +97,7 @@ static struct rt_pwm_ops drv_ops =
 static rt_err_t drv_pwm_enable(TMR_Type* TMRx, struct rt_pwm_configuration *configuration, rt_bool_t enable)
 {
     /* Get the value of channel */
-    rt_uint32_t channel = configuration->channel;   
+    rt_uint32_t channel = configuration->channel;
 
     if (!enable)
     {
@@ -137,7 +137,7 @@ static rt_err_t drv_pwm_enable(TMR_Type* TMRx, struct rt_pwm_configuration *conf
           TMR_CCxCmd(TMRx, TMR_Channel_1, TMR_CCx_Enable);
         }
     }
-    
+
     /* TMRx enable counter */
     TMR_Cmd(TMRx, ENABLE);
 
@@ -173,7 +173,7 @@ static rt_err_t drv_pwm_get(TMR_Type* TMRx, struct rt_pwm_configuration *configu
       configuration->pulse = (cc3 + 1) * (div + 1) * 1000UL / tim_clock;
     if(channel == 4)
       configuration->pulse = (cc4 + 1) * (div + 1) * 1000UL / tim_clock;
-       
+
     return RT_EOK;
 }
 
@@ -185,15 +185,15 @@ static rt_err_t drv_pwm_set(TMR_Type* TMRx, struct rt_pwm_configuration *configu
     rt_uint64_t psc;
     /* Get the channel number */
     rt_uint32_t channel = configuration->channel;
-    
+
     /* Init timer pin and enable clock */
     at32_msp_tmr_init(TMRx);
-  
+
     /* Convert nanosecond to frequency and duty cycle. */
     period = (unsigned long long)configuration->period ;
     psc = period / MAX_PERIOD + 1;
     period = period / psc;
-  
+
     /* TMRe base configuration */
     TMR_TimeBaseStructInit(&TMR_TMReBaseStructure);
     TMR_TMReBaseStructure.TMR_Period = period;
@@ -204,14 +204,14 @@ static rt_err_t drv_pwm_set(TMR_Type* TMRx, struct rt_pwm_configuration *configu
     TMR_TimeBaseInit(TMRx, &TMR_TMReBaseStructure);
 
     pulse = (unsigned long long)configuration->pulse;
-    
+
     /* PWM1 Mode configuration: Channel1 */
     TMR_OCStructInit(&TMR_OCInitStructure);
     TMR_OCInitStructure.TMR_OCMode = TMR_OCMode_PWM1;
     TMR_OCInitStructure.TMR_OutputState = TMR_OutputState_Enable;
     TMR_OCInitStructure.TMR_Pulse = pulse;
     TMR_OCInitStructure.TMR_OCPolarity = TMR_OCPolarity_High;
-    
+
     if(channel == 1)
     {
       TMR_OC1Init(TMRx, &TMR_OCInitStructure);
@@ -232,7 +232,7 @@ static rt_err_t drv_pwm_set(TMR_Type* TMRx, struct rt_pwm_configuration *configu
       TMR_OC4Init(TMRx, &TMR_OCInitStructure);
       TMR_OC4PreloadConfig(TMRx, TMR_OCPreload_Enable);
     }
-    
+
     TMR_ARPreloadConfig(TMRx, ENABLE);
 
 #if defined (SOC_SERIES_AT32F415)
@@ -271,7 +271,7 @@ static int rt_hw_pwm_init(void)
 {
     int i = 0;
     int result = RT_EOK;
- 
+
     for(i = 0; i < sizeof(at32_pwm_obj) / sizeof(at32_pwm_obj[0]); i++)
     {
         if(rt_device_pwm_register(&at32_pwm_obj[i].pwm_device, at32_pwm_obj[i].name, &drv_ops, at32_pwm_obj[i].tim_handle) == RT_EOK)
@@ -280,9 +280,9 @@ static int rt_hw_pwm_init(void)
         }
         else
         {
-          LOG_D("%s register failed", at32_pwm_obj[i].name); 
-          result = -RT_ERROR; 
-        }            
+          LOG_D("%s register failed", at32_pwm_obj[i].name);
+          result = -RT_ERROR;
+        }
     }
 
     return result;
diff --git a/bsp/at32/Libraries/rt_drivers/drv_pwm.h b/bsp/at32/Libraries/rt_drivers/drv_pwm.h
index 6cdcfc6415..720a810f79 100644
--- a/bsp/at32/Libraries/rt_drivers/drv_pwm.h
+++ b/bsp/at32/Libraries/rt_drivers/drv_pwm.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -28,7 +28,7 @@ extern "C" {
   }
 #endif /* PWM1_CONFIG */
 #endif /* BSP_USING_TMR1_CH1 */
-  
+
 #ifdef BSP_USING_TMR1_CH2
 #ifndef PWM2_CONFIG
 #define PWM2_CONFIG              \
@@ -72,7 +72,7 @@ extern "C" {
   }
 #endif /* PWM5_CONFIG */
 #endif /* BSP_USING_TMR2_CH1 */
-  
+
 #ifdef BSP_USING_TMR2_CH2
 #ifndef PWM6_CONFIG
 #define PWM6_CONFIG              \
@@ -82,8 +82,8 @@ extern "C" {
     .channel      = 2            \
   }
 #endif /* PWM6_CONFIG */
-#endif /* BSP_USING_TMR2_CH2 */  
-  
+#endif /* BSP_USING_TMR2_CH2 */
+
 #ifdef BSP_USING_TMR2_CH3
 #ifndef PWM7_CONFIG
 #define PWM7_CONFIG              \
@@ -93,7 +93,7 @@ extern "C" {
     .channel      = 3            \
   }
 #endif /* PWM7_CONFIG */
-#endif /* BSP_USING_TMR2_CH3 */  
+#endif /* BSP_USING_TMR2_CH3 */
 
 #ifdef BSP_USING_TMR2_CH4
 #ifndef PWM8_CONFIG
@@ -115,7 +115,7 @@ extern "C" {
     .channel      = 1            \
   }
 #endif /* PWM9_CONFIG */
-#endif /* BSP_USING_TMR3_CH1 */   
+#endif /* BSP_USING_TMR3_CH1 */
 
 #ifdef BSP_USING_TMR3_CH2
 #ifndef PWM10_CONFIG
@@ -149,7 +149,7 @@ extern "C" {
   }
 #endif /* PWM12_CONFIG */
 #endif /* BSP_USING_TMR3_CH4 */
-  
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/bsp/at32/Libraries/rt_drivers/drv_rtc.c b/bsp/at32/Libraries/rt_drivers/drv_rtc.c
index bd4d89a9ed..d943123e88 100644
--- a/bsp/at32/Libraries/rt_drivers/drv_rtc.c
+++ b/bsp/at32/Libraries/rt_drivers/drv_rtc.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -79,10 +79,10 @@ static rt_err_t set_rtc_time_stamp(time_t time_stamp)
         return -RT_ERROR;
     }
 #else
-	/* Set the RTC counter value */
-	RTC_SetCounter(time_stamp);
-	/* Wait until last write operation on RTC registers has finished */
-	RTC_WaitForLastTask();
+    /* Set the RTC counter value */
+    RTC_SetCounter(time_stamp);
+    /* Wait until last write operation on RTC registers has finished */
+    RTC_WaitForLastTask();
 #endif /* SOC_SERIES_AT32F415 */
     LOG_D("set rtc time.");
 #ifdef SOC_SERIES_AT32F415
@@ -117,7 +117,7 @@ static rt_err_t rt_rtc_config(struct rt_device *dev)
     ERTC_InitType ERTC_InitStructure;
 #endif
     /* Allow access to BKP Domain */
-    PWR_BackupAccessCtrl(ENABLE); 
+    PWR_BackupAccessCtrl(ENABLE);
 
 #ifdef SOC_SERIES_AT32F415
   #ifdef BSP_RTC_USING_LSI
@@ -148,7 +148,7 @@ static rt_err_t rt_rtc_config(struct rt_device *dev)
 #else
     if (BKP_ReadBackupReg(BKP_DT1) != BKUP_REG_DATA)
 #endif
-  	{
+    {
         LOG_I("RTC hasn't been configured, please use <date> command to config.");
 #ifdef SOC_SERIES_AT32F415
         /* Configure the ERTC data register and ERTC prescaler */
diff --git a/bsp/at32/Libraries/rt_drivers/drv_sdio.c b/bsp/at32/Libraries/rt_drivers/drv_sdio.c
index eb721033b5..9bbfa910c2 100644
--- a/bsp/at32/Libraries/rt_drivers/drv_sdio.c
+++ b/bsp/at32/Libraries/rt_drivers/drv_sdio.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
diff --git a/bsp/at32/Libraries/rt_drivers/drv_sdio.h b/bsp/at32/Libraries/rt_drivers/drv_sdio.h
index cd0f05b9fb..de993881c9 100644
--- a/bsp/at32/Libraries/rt_drivers/drv_sdio.h
+++ b/bsp/at32/Libraries/rt_drivers/drv_sdio.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
diff --git a/bsp/at32/Libraries/rt_drivers/drv_soft_i2c.c b/bsp/at32/Libraries/rt_drivers/drv_soft_i2c.c
index 266209c245..3112da34f8 100644
--- a/bsp/at32/Libraries/rt_drivers/drv_soft_i2c.c
+++ b/bsp/at32/Libraries/rt_drivers/drv_soft_i2c.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -205,10 +205,10 @@ int rt_hw_i2c_init(void)
         result = rt_i2c_bit_add_bus(&i2c_obj[i].i2c_bus, soft_i2c_config[i].bus_name);
         RT_ASSERT(result == RT_EOK);
         at32_i2c_bus_unlock(&soft_i2c_config[i]);
-        
+
         LOG_D("software simulation %s init done, pin scl: %d, pin sda %d",
-        soft_i2c_config[i].bus_name, 
-        soft_i2c_config[i].scl, 
+        soft_i2c_config[i].bus_name,
+        soft_i2c_config[i].scl,
         soft_i2c_config[i].sda);
     }
 
diff --git a/bsp/at32/Libraries/rt_drivers/drv_soft_i2c.h b/bsp/at32/Libraries/rt_drivers/drv_soft_i2c.h
index 2743259ef6..193c8cd4aa 100644
--- a/bsp/at32/Libraries/rt_drivers/drv_soft_i2c.h
+++ b/bsp/at32/Libraries/rt_drivers/drv_soft_i2c.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -37,7 +37,7 @@ struct at32_i2c
         .bus_name = "i2c1",                              \
     }
 #endif
-    
+
 #ifdef BSP_USING_I2C2
 #define i2c_bus_CONFIG                                   \
     {                                                    \
@@ -46,7 +46,7 @@ struct at32_i2c
         .bus_name = "i2c2",                              \
     }
 #endif
-    
+
 #ifdef BSP_USING_I2C3
 #define I2C3_BUS_CONFIG                                  \
     {                                                    \
@@ -55,7 +55,7 @@ struct at32_i2c
         .bus_name = "i2c3",                              \
     }
 #endif
-		
+
 #ifdef BSP_USING_I2C4
 #define I2C4_BUS_CONFIG                                  \
     {                                                    \
diff --git a/bsp/at32/Libraries/rt_drivers/drv_spi.c b/bsp/at32/Libraries/rt_drivers/drv_spi.c
index c7821d4053..161845702f 100644
--- a/bsp/at32/Libraries/rt_drivers/drv_spi.c
+++ b/bsp/at32/Libraries/rt_drivers/drv_spi.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -7,7 +7,7 @@
  * Date           Author       Notes
  * 2020-01-09     shelton      first version
  */
- 
+
 #include <board.h>
 #include "drv_spi.h"
 
@@ -24,7 +24,7 @@
 #ifdef DEBUG
 #define DEBUG_PRINTF(...)   rt_kprintf(__VA_ARGS__)
 #else
-#define DEBUG_PRINTF(...)   
+#define DEBUG_PRINTF(...)
 #endif
 
 /* private rt-thread spi ops function */
@@ -81,13 +81,13 @@ rt_err_t rt_hw_spi_device_attach(const char *bus_name, const char *device_name,
 static rt_err_t configure(struct rt_spi_device* device,
                           struct rt_spi_configuration* configuration)
 {
-    struct rt_spi_bus * spi_bus = (struct rt_spi_bus *)device->bus;	
+    struct rt_spi_bus * spi_bus = (struct rt_spi_bus *)device->bus;
     struct at32_spi *spi_instance = (struct at32_spi *)spi_bus->parent.user_data;
-    
+
     SPI_InitType SPI_InitStruct;
 
-	  RT_ASSERT(device != RT_NULL);
-	  RT_ASSERT(configuration != RT_NULL);
+      RT_ASSERT(device != RT_NULL);
+      RT_ASSERT(configuration != RT_NULL);
 
     at32_msp_spi_init(spi_instance->config->spix);
 
@@ -162,7 +162,7 @@ static rt_err_t configure(struct rt_spi_device* device,
             SPI_InitStruct.SPI_MCLKP = SPI_MCLKP_256;
         }
     } /* baudrate */
-    
+
     switch(configuration->mode & RT_SPI_MODE_3)
     {
     case RT_SPI_MODE_0:
@@ -172,11 +172,11 @@ static rt_err_t configure(struct rt_spi_device* device,
     case RT_SPI_MODE_1:
         SPI_InitStruct.SPI_CPHA = SPI_CPHA_2EDGE;
         SPI_InitStruct.SPI_CPOL = SPI_CPOL_LOW;
-        break;        
+        break;
     case RT_SPI_MODE_2:
         SPI_InitStruct.SPI_CPHA = SPI_CPHA_1EDGE;
         SPI_InitStruct.SPI_CPOL = SPI_CPOL_HIGH;
-        break;    
+        break;
     case RT_SPI_MODE_3:
         SPI_InitStruct.SPI_CPHA = SPI_CPHA_2EDGE;
         SPI_InitStruct.SPI_CPOL = SPI_CPOL_HIGH;
@@ -200,7 +200,7 @@ static rt_err_t configure(struct rt_spi_device* device,
     /* init SPI */
     SPI_Init(spi_instance->config->spix, &SPI_InitStruct);
     /* Enable SPI_MASTER */
-	  SPI_Enable(spi_instance->config->spix, ENABLE);
+      SPI_Enable(spi_instance->config->spix, ENABLE);
     SPI_CRCEN(spi_instance->config->spix, DISABLE);
 
     return RT_EOK;
@@ -213,9 +213,9 @@ static rt_uint32_t xfer(struct rt_spi_device* device, struct rt_spi_message* mes
     struct rt_spi_configuration * config = &device->config;
     struct at32_spi_cs * at32_spi_cs = device->parent.user_data;
 
-	  RT_ASSERT(device != NULL);
-	  RT_ASSERT(message != NULL);
-	
+      RT_ASSERT(device != NULL);
+      RT_ASSERT(message != NULL);
+
     /* take CS */
     if(message->cs_take)
     {
@@ -229,7 +229,7 @@ static rt_uint32_t xfer(struct rt_spi_device* device, struct rt_spi_message* mes
             const rt_uint8_t * send_ptr = message->send_buf;
             rt_uint8_t * recv_ptr = message->recv_buf;
             rt_uint32_t size = message->length;
-            
+
             DEBUG_PRINTF("spi poll transfer start: %d\n", size);
 
             while(size--)
@@ -240,12 +240,12 @@ static rt_uint32_t xfer(struct rt_spi_device* device, struct rt_spi_message* mes
                 {
                     data = *send_ptr++;
                 }
-                
+
                 // Todo: replace register read/write by at32 lib
                 //Wait until the transmit buffer is empty
                 while(RESET == SPI_I2S_GetFlagStatus(spi_instance->config->spix, SPI_I2S_FLAG_TE));
                 // Send the byte
-				        SPI_I2S_TxData(spi_instance->config->spix, data);
+                        SPI_I2S_TxData(spi_instance->config->spix, data);
 
                 //Wait until a data is received
                 while(RESET == SPI_I2S_GetFlagStatus(spi_instance->config->spix, SPI_I2S_FLAG_RNE));
@@ -277,7 +277,7 @@ static rt_uint32_t xfer(struct rt_spi_device* device, struct rt_spi_message* mes
                 //Wait until the transmit buffer is empty
                 while(RESET == SPI_I2S_GetFlagStatus(spi_instance->config->spix, SPI_I2S_FLAG_TE));
                 // Send the byte
-				        SPI_I2S_TxData(spi_instance->config->spix, data);
+                        SPI_I2S_TxData(spi_instance->config->spix, data);
 
                 //Wait until a data is received
                 while(RESET == SPI_I2S_GetFlagStatus(spi_instance->config->spix, SPI_I2S_FLAG_RNE));
@@ -295,7 +295,7 @@ static rt_uint32_t xfer(struct rt_spi_device* device, struct rt_spi_message* mes
     /* release CS */
     if(message->cs_release)
     {
-		    GPIO_SetBits(at32_spi_cs->GPIOx, at32_spi_cs->GPIO_Pin);
+            GPIO_SetBits(at32_spi_cs->GPIOx, at32_spi_cs->GPIO_Pin);
         DEBUG_PRINTF("spi release cs\n");
     }
 
@@ -306,7 +306,7 @@ static struct at32_spi_config configs[] = {
 #ifdef BSP_USING_SPI1
     {SPI1, "spi1"},
 #endif
-    
+
 #ifdef BSP_USING_SPI2
     {SPI2, "spi2"},
 #endif
diff --git a/bsp/at32/Libraries/rt_drivers/drv_spi.h b/bsp/at32/Libraries/rt_drivers/drv_spi.h
index d3134b00f0..cd90c9b2b0 100644
--- a/bsp/at32/Libraries/rt_drivers/drv_spi.h
+++ b/bsp/at32/Libraries/rt_drivers/drv_spi.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
diff --git a/bsp/at32/Libraries/rt_drivers/drv_sram.c b/bsp/at32/Libraries/rt_drivers/drv_sram.c
index e601b0e1a5..d77b900728 100644
--- a/bsp/at32/Libraries/rt_drivers/drv_sram.c
+++ b/bsp/at32/Libraries/rt_drivers/drv_sram.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -38,7 +38,7 @@ static int rt_hw_sram_Init(void)
 
     /* Init XMC pin */
     at32_msp_xmc_init(XMC);
-    
+
     /*-- FSMC Configuration ------------------------------------------------------*/
     p.XMC_AdrOpTime         = 0x04;
     p.XMC_AdrHoldTime       = 0x04;
@@ -53,7 +53,7 @@ static int rt_hw_sram_Init(void)
     XMC_NORSRAMInitStructure.XMC_Dev                    = XMC_Dev_SRAM;
     XMC_NORSRAMInitStructure.XMC_BusType                = XMC_BusType_16b;
     XMC_NORSRAMInitStructure.XMC_EnableBurstMode        = XMC_BurstMode_Disable;
-    XMC_NORSRAMInitStructure.XMC_EnableAsynWait         = XMC_AsynWait_Disable;  
+    XMC_NORSRAMInitStructure.XMC_EnableAsynWait         = XMC_AsynWait_Disable;
     XMC_NORSRAMInitStructure.XMC_WaitSignalLv           = XMC_WaitSignalLv_Low;
     XMC_NORSRAMInitStructure.XMC_EnableBurstModeSplit   = XMC_BurstModeSplit_Disable;
     XMC_NORSRAMInitStructure.XMC_WaitSignalConfig       = XMC_WaitSignalConfig_BeforeWaitState;
@@ -63,9 +63,9 @@ static int rt_hw_sram_Init(void)
     XMC_NORSRAMInitStructure.XMC_WriteBurstSyn          = XMC_WriteBurstSyn_Disable;
     XMC_NORSRAMInitStructure.XMC_RWTimingStruct         = &p;
     XMC_NORSRAMInitStructure.XMC_WTimingStruct          = &p;
-    
-    XMC_NORSRAMInit(&XMC_NORSRAMInitStructure); 
-    
+
+    XMC_NORSRAMInit(&XMC_NORSRAMInitStructure);
+
     /*!< Enable FSMC Bank1_SRAM Bank */
     XMC_NORSRAMCmd(XMC_Bank1_NORSRAM3, ENABLE);
 
@@ -73,7 +73,7 @@ static int rt_hw_sram_Init(void)
         /* If RT_USING_MEMHEAP_AS_HEAP is enabled, SRAM is initialized to the heap */
         rt_memheap_init(&system_heap, "sram", (void *)EXT_SRAM_BEGIN, SRAM_LENGTH);
 #endif
-    
+
     return result;
 }
 INIT_BOARD_EXPORT(rt_hw_sram_Init);
@@ -81,11 +81,11 @@ INIT_BOARD_EXPORT(rt_hw_sram_Init);
 #ifdef DRV_DEBUG
 #ifdef FINSH_USING_MSH
 /**
-  * @brief  Writes a Half-word buffer to the FSMC SRAM memory. 
-  * @param  pBuffer : pointer to buffer. 
-  * @param  WriteAddr : SRAM memory internal address from which the data will be 
+  * @brief  Writes a Half-word buffer to the FSMC SRAM memory.
+  * @param  pBuffer : pointer to buffer.
+  * @param  WriteAddr : SRAM memory internal address from which the data will be
   *         written.
-  * @param  NumHalfwordToWrite : number of half-words to write. 
+  * @param  NumHalfwordToWrite : number of half-words to write.
   * @retval None
   */
 static void SRAM_WriteBuffer(uint16_t* pBuffer, uint32_t WriteAddr, uint32_t NumHalfwordToWrite)
@@ -94,15 +94,15 @@ static void SRAM_WriteBuffer(uint16_t* pBuffer, uint32_t WriteAddr, uint32_t Num
   {
     /*!< Transfer data to the memory */
     *(uint16_t *) (EXT_SRAM_BEGIN + WriteAddr) = *pBuffer++;
-    
-    /*!< Increment the address*/  
+
+    /*!< Increment the address*/
     WriteAddr += 2;
-  }   
+  }
 }
 
 /**
   * @brief  Reads a block of data from the FSMC SRAM memory.
-  * @param  pBuffer : pointer to the buffer that receives the data read from the 
+  * @param  pBuffer : pointer to the buffer that receives the data read from the
   *         SRAM memory.
   * @param  ReadAddr : SRAM memory internal address to read from.
   * @param  NumHalfwordToRead : number of half-words to read.
@@ -115,9 +115,9 @@ static void SRAM_ReadBuffer(uint16_t* pBuffer, uint32_t ReadAddr, uint32_t NumHa
     /*!< Read a half-word from the memory */
     *pBuffer++ = *(__IO uint16_t*) (EXT_SRAM_BEGIN + ReadAddr);
 
-    /*!< Increment the address*/  
+    /*!< Increment the address*/
     ReadAddr += 2;
-  }  
+  }
 }
 
 /**
@@ -146,9 +146,9 @@ int sram_test(void)
 
 
     /* Read data from XMC SRAM memory */
-    SRAM_ReadBuffer(RT_RxBuffer, RT_WRITE_READ_ADDR, RT_BUFFER_SIZE);  
+    SRAM_ReadBuffer(RT_RxBuffer, RT_WRITE_READ_ADDR, RT_BUFFER_SIZE);
 
-    /* Read back SRAM memory and check content correctness */   
+    /* Read back SRAM memory and check content correctness */
     for (Index = 0x00; (Index < RT_BUFFER_SIZE) && (WriteReadStatus == 0); Index++)
     {
         if (RT_RxBuffer[Index] != RT_TxBuffer[Index])
@@ -156,7 +156,7 @@ int sram_test(void)
             WriteReadStatus = Index + 1;
         }
     }
-    
+
     if(WriteReadStatus == 0)
     {
         LOG_D("SRAM test success!");
@@ -165,7 +165,7 @@ int sram_test(void)
     {
         LOG_E("SRAM test failed!");
     }
-    
+
     return RT_EOK;
 }
 MSH_CMD_EXPORT(sram_test, sram test)
diff --git a/bsp/at32/Libraries/rt_drivers/drv_sram.h b/bsp/at32/Libraries/rt_drivers/drv_sram.h
index 05b07e4155..0f83c429d8 100644
--- a/bsp/at32/Libraries/rt_drivers/drv_sram.h
+++ b/bsp/at32/Libraries/rt_drivers/drv_sram.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
diff --git a/bsp/at32/Libraries/rt_drivers/drv_usart.c b/bsp/at32/Libraries/rt_drivers/drv_usart.c
index 226d9afeda..04838bf2ac 100644
--- a/bsp/at32/Libraries/rt_drivers/drv_usart.c
+++ b/bsp/at32/Libraries/rt_drivers/drv_usart.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2020, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -15,7 +15,7 @@
 #if !defined(BSP_USING_UART1) && !defined(BSP_USING_UART2) && \
     !defined(BSP_USING_UART3)
     #error "Please define at least one BSP_USING_UARTx"
-    /* this driver can be disabled at menuconfig ¡ú RT-Thread Components ¡ú Device Drivers */
+    /* this driver can be disabled at menuconfig → RT-Thread Components → Device Drivers */
 #endif
 
 struct at32_usart {
diff --git a/bsp/at32/Libraries/rt_drivers/drv_usart.h b/bsp/at32/Libraries/rt_drivers/drv_usart.h
index 1002a6fd51..fc493d42da 100644
--- a/bsp/at32/Libraries/rt_drivers/drv_usart.h
+++ b/bsp/at32/Libraries/rt_drivers/drv_usart.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
diff --git a/bsp/at32/Libraries/rt_drivers/drv_wdt.c b/bsp/at32/Libraries/rt_drivers/drv_wdt.c
index 8ab3de703d..0b304ad1ff 100644
--- a/bsp/at32/Libraries/rt_drivers/drv_wdt.c
+++ b/bsp/at32/Libraries/rt_drivers/drv_wdt.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
diff --git a/bsp/at32/at32f403a-start/applications/main.c b/bsp/at32/at32f403a-start/applications/main.c
index cb63824e27..0234d32b04 100644
--- a/bsp/at32/at32f403a-start/applications/main.c
+++ b/bsp/at32/at32f403a-start/applications/main.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
diff --git a/bsp/at32/at32f403a-start/board/board.c b/bsp/at32/at32f403a-start/board/board.c
index 4ce5bb3909..27b672b4da 100644
--- a/bsp/at32/at32f403a-start/board/board.c
+++ b/bsp/at32/at32f403a-start/board/board.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -7,7 +7,7 @@
  * Date           Author       Notes
  * 2018-11-06     balanceTWK   first version
  */
- 
+
 #include <stdint.h>
 #include <rthw.h>
 #include <rtthread.h>
diff --git a/bsp/at32/at32f403a-start/board/board.h b/bsp/at32/at32f403a-start/board/board.h
index 976863d3eb..1f2a4f3f3c 100644
--- a/bsp/at32/at32f403a-start/board/board.h
+++ b/bsp/at32/at32f403a-start/board/board.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
diff --git a/bsp/at32/at32f403a-start/board/msp/at32_msp.c b/bsp/at32/at32f403a-start/board/msp/at32_msp.c
index 1392b0e0cf..5d159850cc 100644
--- a/bsp/at32/at32f403a-start/board/msp/at32_msp.c
+++ b/bsp/at32/at32f403a-start/board/msp/at32_msp.c
@@ -195,34 +195,34 @@ void at32_msp_adc_init(void *Instance)
     GPIO_InitType GPIO_InitStruct;
     ADC_Type *ADCx = (ADC_Type *)Instance;
 
-#ifdef BSP_USING_ADC1  
+#ifdef BSP_USING_ADC1
     if(ADCx == ADC1)
-    {   
+    {
         /* ADC1 & GPIO clock enable */
         RCC_APB2PeriphClockCmd(RCC_APB2PERIPH_ADC1 | RCC_APB2PERIPH_GPIOA | RCC_APB2PERIPH_GPIOB | RCC_APB2PERIPH_GPIOC,ENABLE);
-		
-        /* Configure ADC Channel as analog input */      
+
+        /* Configure ADC Channel as analog input */
         GPIO_StructInit(&GPIO_InitStruct);
         GPIO_InitStruct.GPIO_Pins = GPIO_Pins_0 | GPIO_Pins_1 | GPIO_Pins_2 | GPIO_Pins_3 | GPIO_Pins_4 | GPIO_Pins_5;
         GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN_ANALOG;
         GPIO_Init(GPIOC, &GPIO_InitStruct);
-        
+
     }
 #endif
 
-#ifdef BSP_USING_ADC2  
+#ifdef BSP_USING_ADC2
     if(ADCx == ADC2)
     {
         /* ADC2 & GPIO clock enable */
         RCC_APB2PeriphClockCmd(RCC_APB2PERIPH_ADC2 | RCC_APB2PERIPH_GPIOA | RCC_APB2PERIPH_GPIOB | RCC_APB2PERIPH_GPIOC,ENABLE);
-      
-        /* Configure ADC Channel as analog input */      
+
+        /* Configure ADC Channel as analog input */
         GPIO_StructInit(&GPIO_InitStruct);
         GPIO_InitStruct.GPIO_Pins = GPIO_Pins_0 | GPIO_Pins_1 | GPIO_Pins_2 | GPIO_Pins_3 | GPIO_Pins_4 | GPIO_Pins_5;
         GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN_ANALOG;
         GPIO_Init(GPIOC, &GPIO_InitStruct);
     }
-#endif     
+#endif
 }
 #endif /* BSP_USING_ADC */
 
@@ -237,7 +237,7 @@ void at32_msp_hwtmr_init(void *Instance)
         /* TMR3 clock enable */
         RCC_APB1PeriphClockCmd(RCC_APB1PERIPH_TMR3, ENABLE);
     }
-#endif 
+#endif
 
 #ifdef BSP_USING_HWTMR4
     if(TMRx == TMR4)
diff --git a/bsp/at32/at32f403a-start/board/msp/system_at32f4xx.c b/bsp/at32/at32f403a-start/board/msp/system_at32f4xx.c
index ce151e2d4a..edd9b8d1d6 100644
--- a/bsp/at32/at32f403a-start/board/msp/system_at32f4xx.c
+++ b/bsp/at32/at32f403a-start/board/msp/system_at32f4xx.c
@@ -17,7 +17,7 @@
   *
   * <h2><center>&copy; COPYRIGHT 2018 ArteryTek</center></h2>
   ******************************************************************************
-  */ 
+  */
 
 /** @addtogroup CMSIS
   * @{
@@ -68,23 +68,23 @@
 
       Clock (MHz)
           PLL from HSE or HSI
-          SYSCLK	    HCLK	PCLK2	PCLK1
-          24	        24	    24	    24
-          36	        36	    36	    36
-          48	        48	    48	    24
-          56	        56	    56	    28
-          72	        72	    72	    36
-          96	        96	    48	    48
-          108	        108	    54	    54
-          120	        120	    60	    60
-          144	        144	    72	    72
-          150	        150	    75	    75
-          168	        168	    84	    84
-          176	        176	    88	    88
-          192	        192	    96	    96
-          200	        200	    100	    100
-          224	        224	    112	    112
-          240	        240	    120	    120
+          SYSCLK        HCLK    PCLK2   PCLK1
+          24            24      24      24
+          36            36      36      36
+          48            48      48      24
+          56            56      56      28
+          72            72      72      36
+          96            96      48      48
+          108           108     54      54
+          120           120     60      60
+          144           144     72      72
+          150           150     75      75
+          168           168     84      84
+          176           176     88      88
+          192           192     96      96
+          200           200     100     100
+          224           224     112     112
+          240           240     120     120
     */
 
 #if defined (AT32F403xx) || defined (AT32F413xx) || \
@@ -143,7 +143,7 @@
 /*!< Uncomment the following line if you need to relocate your vector Table in
      Internal SRAM. */
 /* #define VECT_TAB_SRAM */
-#define VECT_TAB_OFFSET  0x0 /*!< Vector Table base offset field. 
+#define VECT_TAB_OFFSET  0x0 /*!< Vector Table base offset field.
 This value must be a multiple of 0x200. */
 
 
@@ -573,7 +573,7 @@ static void SetSysClock(void)
 /**
   * @brief  Setup the external memory controller.
   *         Called in startup_at32f4xx_xx.s/.c before jump to main.
-  * 	      This function configures the external SRAM mounted
+  *           This function configures the external SRAM mounted
   *         (AT32 High density devices). This SRAM will be used as program
   *         data memory (including heap and stack).
   * @param  None
@@ -654,7 +654,7 @@ static void SetSysClockToHSE(void)
     StartUpCounter++;
   }
   while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
-#ifdef AT32F403xx 
+#ifdef AT32F403xx
   WaitHseStbl(HSE_STABLE_DELAY);
 #endif
   if ((RCC->CTRL & RCC_CTRL_HSESTBL) != RESET)
@@ -674,7 +674,7 @@ static void SetSysClockToHSE(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_0;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_0;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -725,7 +725,7 @@ static void SetSysClockTo24M(void)
     StartUpCounter++;
   }
   while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
-#ifdef AT32F403xx 
+#ifdef AT32F403xx
   WaitHseStbl(HSE_STABLE_DELAY);
 #endif
   if ((RCC->CTRL & RCC_CTRL_HSESTBL) != RESET)
@@ -745,7 +745,7 @@ static void SetSysClockTo24M(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_0;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_0;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -811,7 +811,7 @@ static void SetSysClockTo36M(void)
     StartUpCounter++;
   }
   while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
-#ifdef AT32F403xx 
+#ifdef AT32F403xx
   WaitHseStbl(HSE_STABLE_DELAY);
 #endif
   if ((RCC->CTRL & RCC_CTRL_HSESTBL) != RESET)
@@ -831,7 +831,7 @@ static void SetSysClockTo36M(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_1;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_1;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -897,7 +897,7 @@ static void SetSysClockTo48M(void)
     StartUpCounter++;
   }
   while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
-#ifdef AT32F403xx 
+#ifdef AT32F403xx
   WaitHseStbl(HSE_STABLE_DELAY);
 #endif
   if ((RCC->CTRL & RCC_CTRL_HSESTBL) != RESET)
@@ -917,7 +917,7 @@ static void SetSysClockTo48M(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_1;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_1;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -984,7 +984,7 @@ static void SetSysClockTo56M(void)
     StartUpCounter++;
   }
   while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
-#ifdef AT32F403xx 
+#ifdef AT32F403xx
   WaitHseStbl(HSE_STABLE_DELAY);
 #endif
   if ((RCC->CTRL & RCC_CTRL_HSESTBL) != RESET)
@@ -1004,7 +1004,7 @@ static void SetSysClockTo56M(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_1;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_1;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -1071,7 +1071,7 @@ static void SetSysClockTo72M(void)
     StartUpCounter++;
   }
   while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
-#ifdef AT32F403xx 
+#ifdef AT32F403xx
   WaitHseStbl(HSE_STABLE_DELAY);
 #endif
   if ((RCC->CTRL & RCC_CTRL_HSESTBL) != RESET)
@@ -1091,7 +1091,7 @@ static void SetSysClockTo72M(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_2;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_2;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -1158,7 +1158,7 @@ static void SetSysClockTo96M(void)
     StartUpCounter++;
   }
   while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
-#ifdef AT32F403xx 
+#ifdef AT32F403xx
   WaitHseStbl(HSE_STABLE_DELAY);
 #endif
   if ((RCC->CTRL & RCC_CTRL_HSESTBL) != RESET)
@@ -1178,7 +1178,7 @@ static void SetSysClockTo96M(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_2;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_2;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -1249,7 +1249,7 @@ static void SetSysClockTo108M(void)
     StartUpCounter++;
   }
   while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
-#ifdef AT32F403xx 
+#ifdef AT32F403xx
   WaitHseStbl(HSE_STABLE_DELAY);
 #endif
   if ((RCC->CTRL & RCC_CTRL_HSESTBL) != RESET)
@@ -1269,7 +1269,7 @@ static void SetSysClockTo108M(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_3;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_3;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -1341,7 +1341,7 @@ static void SetSysClockTo120M(void)
     StartUpCounter++;
   }
   while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
-#ifdef AT32F403xx 
+#ifdef AT32F403xx
   WaitHseStbl(HSE_STABLE_DELAY);
 #endif
   if ((RCC->CTRL & RCC_CTRL_HSESTBL) != RESET)
@@ -1361,7 +1361,7 @@ static void SetSysClockTo120M(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_3;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_3;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -1440,7 +1440,7 @@ static void SetSysClockTo144M(void)
     StartUpCounter++;
   }
   while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
-#ifdef AT32F403xx 
+#ifdef AT32F403xx
   WaitHseStbl(HSE_STABLE_DELAY);
 #endif
   if ((RCC->CTRL & RCC_CTRL_HSESTBL) != RESET)
@@ -1460,7 +1460,7 @@ static void SetSysClockTo144M(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_4;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_4;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -1475,7 +1475,7 @@ static void SetSysClockTo144M(void)
 
     /*  PLL configuration: PLLCLK = HSE * 18 = 144 MHz */
     RCC->CFG &= RCC_CFG_PLLCFG_MASK;
-    
+
 #if defined (AT32F415xx)
     RCC->CFG |= (uint32_t)(RCC_CFG_PLLRC_HSE | RCC_CFG_PLLMULT18);
 #else
@@ -1539,7 +1539,7 @@ static void SetSysClockTo150M(void)
     StartUpCounter++;
   }
   while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
-#ifdef AT32F403xx 
+#ifdef AT32F403xx
   WaitHseStbl(HSE_STABLE_DELAY);
 #endif
   if ((RCC->CTRL & RCC_CTRL_HSESTBL) != RESET)
@@ -1559,7 +1559,7 @@ static void SetSysClockTo150M(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_4;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_4;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -1634,7 +1634,7 @@ static void SetSysClockTo168M(void)
     StartUpCounter++;
   }
   while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
-#ifdef AT32F403xx 
+#ifdef AT32F403xx
   WaitHseStbl(HSE_STABLE_DELAY);
 #endif
   if ((RCC->CTRL & RCC_CTRL_HSESTBL) != RESET)
@@ -1720,7 +1720,7 @@ static void SetSysClockTo176M(void)
     StartUpCounter++;
   }
   while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
-#ifdef AT32F403xx 
+#ifdef AT32F403xx
   WaitHseStbl(HSE_STABLE_DELAY);
 #endif
   if ((RCC->CTRL & RCC_CTRL_HSESTBL) != RESET)
@@ -1806,7 +1806,7 @@ static void SetSysClockTo192M(void)
     StartUpCounter++;
   }
   while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
-#ifdef AT32F403xx 
+#ifdef AT32F403xx
   WaitHseStbl(HSE_STABLE_DELAY);
 #endif
   if ((RCC->CTRL & RCC_CTRL_HSESTBL) != RESET)
@@ -1892,7 +1892,7 @@ static void SetSysClockTo200M(void)
     StartUpCounter++;
   }
   while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
-#ifdef AT32F403xx 
+#ifdef AT32F403xx
   WaitHseStbl(HSE_STABLE_DELAY);
 #endif
   if ((RCC->CTRL & RCC_CTRL_HSESTBL) != RESET)
@@ -1978,7 +1978,7 @@ static void SetSysClockTo224M(void)
     StartUpCounter++;
   }
   while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
-#ifdef AT32F403xx 
+#ifdef AT32F403xx
   WaitHseStbl(HSE_STABLE_DELAY);
 #endif
   if ((RCC->CTRL & RCC_CTRL_HSESTBL) != RESET)
@@ -2064,7 +2064,7 @@ static void SetSysClockTo240M(void)
     StartUpCounter++;
   }
   while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
-#ifdef AT32F403xx 
+#ifdef AT32F403xx
   WaitHseStbl(HSE_STABLE_DELAY);
 #endif
   if ((RCC->CTRL & RCC_CTRL_HSESTBL) != RESET)
@@ -2168,7 +2168,7 @@ static void SetSysClockTo24MHSI(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_0;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_0;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -2248,7 +2248,7 @@ static void SetSysClockTo36MHSI(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_1;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_1;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -2328,7 +2328,7 @@ static void SetSysClockTo48MHSI(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_1;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_1;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -2408,7 +2408,7 @@ static void SetSysClockTo56MHSI(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_1;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_1;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -2488,7 +2488,7 @@ static void SetSysClockTo72MHSI(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_2;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_2;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -2568,7 +2568,7 @@ static void SetSysClockTo96MHSI(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_2;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_2;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -2653,7 +2653,7 @@ static void SetSysClockTo108MHSI(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_3;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_3;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -2738,7 +2738,7 @@ static void SetSysClockTo120MHSI(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_3;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_3;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -2830,7 +2830,7 @@ static void SetSysClockTo144MHSI(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_4;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_4;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -2922,7 +2922,7 @@ static void SetSysClockTo150MHSI(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_4;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_4;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -3454,4 +3454,4 @@ static void SetSysClockTo240MHSI(void)
   * @}
   */
 
-/******************* (C) COPYRIGHT 2018 ArteryTek *****END OF FILE****/ 
+/******************* (C) COPYRIGHT 2018 ArteryTek *****END OF FILE****/
diff --git a/bsp/at32/at32f407-start/applications/main.c b/bsp/at32/at32f407-start/applications/main.c
index cb63824e27..0234d32b04 100644
--- a/bsp/at32/at32f407-start/applications/main.c
+++ b/bsp/at32/at32f407-start/applications/main.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
diff --git a/bsp/at32/at32f407-start/board/board.c b/bsp/at32/at32f407-start/board/board.c
index 4ce5bb3909..27b672b4da 100644
--- a/bsp/at32/at32f407-start/board/board.c
+++ b/bsp/at32/at32f407-start/board/board.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -7,7 +7,7 @@
  * Date           Author       Notes
  * 2018-11-06     balanceTWK   first version
  */
- 
+
 #include <stdint.h>
 #include <rthw.h>
 #include <rtthread.h>
diff --git a/bsp/at32/at32f407-start/board/board.h b/bsp/at32/at32f407-start/board/board.h
index 976863d3eb..1f2a4f3f3c 100644
--- a/bsp/at32/at32f407-start/board/board.h
+++ b/bsp/at32/at32f407-start/board/board.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2018, RT-Thread Development Team
+ * Copyright (c) 2006-2021, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
diff --git a/bsp/at32/at32f407-start/board/msp/at32_msp.c b/bsp/at32/at32f407-start/board/msp/at32_msp.c
index 1392b0e0cf..5d159850cc 100644
--- a/bsp/at32/at32f407-start/board/msp/at32_msp.c
+++ b/bsp/at32/at32f407-start/board/msp/at32_msp.c
@@ -195,34 +195,34 @@ void at32_msp_adc_init(void *Instance)
     GPIO_InitType GPIO_InitStruct;
     ADC_Type *ADCx = (ADC_Type *)Instance;
 
-#ifdef BSP_USING_ADC1  
+#ifdef BSP_USING_ADC1
     if(ADCx == ADC1)
-    {   
+    {
         /* ADC1 & GPIO clock enable */
         RCC_APB2PeriphClockCmd(RCC_APB2PERIPH_ADC1 | RCC_APB2PERIPH_GPIOA | RCC_APB2PERIPH_GPIOB | RCC_APB2PERIPH_GPIOC,ENABLE);
-		
-        /* Configure ADC Channel as analog input */      
+
+        /* Configure ADC Channel as analog input */
         GPIO_StructInit(&GPIO_InitStruct);
         GPIO_InitStruct.GPIO_Pins = GPIO_Pins_0 | GPIO_Pins_1 | GPIO_Pins_2 | GPIO_Pins_3 | GPIO_Pins_4 | GPIO_Pins_5;
         GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN_ANALOG;
         GPIO_Init(GPIOC, &GPIO_InitStruct);
-        
+
     }
 #endif
 
-#ifdef BSP_USING_ADC2  
+#ifdef BSP_USING_ADC2
     if(ADCx == ADC2)
     {
         /* ADC2 & GPIO clock enable */
         RCC_APB2PeriphClockCmd(RCC_APB2PERIPH_ADC2 | RCC_APB2PERIPH_GPIOA | RCC_APB2PERIPH_GPIOB | RCC_APB2PERIPH_GPIOC,ENABLE);
-      
-        /* Configure ADC Channel as analog input */      
+
+        /* Configure ADC Channel as analog input */
         GPIO_StructInit(&GPIO_InitStruct);
         GPIO_InitStruct.GPIO_Pins = GPIO_Pins_0 | GPIO_Pins_1 | GPIO_Pins_2 | GPIO_Pins_3 | GPIO_Pins_4 | GPIO_Pins_5;
         GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN_ANALOG;
         GPIO_Init(GPIOC, &GPIO_InitStruct);
     }
-#endif     
+#endif
 }
 #endif /* BSP_USING_ADC */
 
@@ -237,7 +237,7 @@ void at32_msp_hwtmr_init(void *Instance)
         /* TMR3 clock enable */
         RCC_APB1PeriphClockCmd(RCC_APB1PERIPH_TMR3, ENABLE);
     }
-#endif 
+#endif
 
 #ifdef BSP_USING_HWTMR4
     if(TMRx == TMR4)
diff --git a/bsp/at32/at32f407-start/board/msp/system_at32f4xx.c b/bsp/at32/at32f407-start/board/msp/system_at32f4xx.c
index efda1bc90b..3205197d67 100644
--- a/bsp/at32/at32f407-start/board/msp/system_at32f4xx.c
+++ b/bsp/at32/at32f407-start/board/msp/system_at32f4xx.c
@@ -17,7 +17,7 @@
   *
   * <h2><center>&copy; COPYRIGHT 2018 ArteryTek</center></h2>
   ******************************************************************************
-  */ 
+  */
 
 /** @addtogroup CMSIS
   * @{
@@ -68,23 +68,23 @@
 
       Clock (MHz)
           PLL from HSE or HSI
-          SYSCLK	    HCLK	PCLK2	PCLK1
-          24	        24	    24	    24
-          36	        36	    36	    36
-          48	        48	    48	    24
-          56	        56	    56	    28
-          72	        72	    72	    36
-          96	        96	    48	    48
-          108	        108	    54	    54
-          120	        120	    60	    60
-          144	        144	    72	    72
-          150	        150	    75	    75
-          168	        168	    84	    84
-          176	        176	    88	    88
-          192	        192	    96	    96
-          200	        200	    100	    100
-          224	        224	    112	    112
-          240	        240	    120	    120
+          SYSCLK        HCLK    PCLK2   PCLK1
+          24            24      24      24
+          36            36      36      36
+          48            48      48      24
+          56            56      56      28
+          72            72      72      36
+          96            96      48      48
+          108           108     54      54
+          120           120     60      60
+          144           144     72      72
+          150           150     75      75
+          168           168     84      84
+          176           176     88      88
+          192           192     96      96
+          200           200     100     100
+          224           224     112     112
+          240           240     120     120
     */
 
 #if defined (AT32F403xx) || defined (AT32F413xx) || \
@@ -143,7 +143,7 @@
 /*!< Uncomment the following line if you need to relocate your vector Table in
      Internal SRAM. */
 /* #define VECT_TAB_SRAM */
-#define VECT_TAB_OFFSET  0x0 /*!< Vector Table base offset field. 
+#define VECT_TAB_OFFSET  0x0 /*!< Vector Table base offset field.
 This value must be a multiple of 0x200. */
 
 
@@ -573,7 +573,7 @@ static void SetSysClock(void)
 /**
   * @brief  Setup the external memory controller.
   *         Called in startup_at32f4xx_xx.s/.c before jump to main.
-  * 	      This function configures the external SRAM mounted
+  *           This function configures the external SRAM mounted
   *         (AT32 High density devices). This SRAM will be used as program
   *         data memory (including heap and stack).
   * @param  None
@@ -654,7 +654,7 @@ static void SetSysClockToHSE(void)
     StartUpCounter++;
   }
   while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
-#ifdef AT32F403xx 
+#ifdef AT32F403xx
   WaitHseStbl(HSE_STABLE_DELAY);
 #endif
   if ((RCC->CTRL & RCC_CTRL_HSESTBL) != RESET)
@@ -674,7 +674,7 @@ static void SetSysClockToHSE(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_0;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_0;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -725,7 +725,7 @@ static void SetSysClockTo24M(void)
     StartUpCounter++;
   }
   while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
-#ifdef AT32F403xx 
+#ifdef AT32F403xx
   WaitHseStbl(HSE_STABLE_DELAY);
 #endif
   if ((RCC->CTRL & RCC_CTRL_HSESTBL) != RESET)
@@ -745,7 +745,7 @@ static void SetSysClockTo24M(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_0;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_0;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -811,7 +811,7 @@ static void SetSysClockTo36M(void)
     StartUpCounter++;
   }
   while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
-#ifdef AT32F403xx 
+#ifdef AT32F403xx
   WaitHseStbl(HSE_STABLE_DELAY);
 #endif
   if ((RCC->CTRL & RCC_CTRL_HSESTBL) != RESET)
@@ -831,7 +831,7 @@ static void SetSysClockTo36M(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_1;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_1;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -897,7 +897,7 @@ static void SetSysClockTo48M(void)
     StartUpCounter++;
   }
   while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
-#ifdef AT32F403xx 
+#ifdef AT32F403xx
   WaitHseStbl(HSE_STABLE_DELAY);
 #endif
   if ((RCC->CTRL & RCC_CTRL_HSESTBL) != RESET)
@@ -917,7 +917,7 @@ static void SetSysClockTo48M(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_1;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_1;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -984,7 +984,7 @@ static void SetSysClockTo56M(void)
     StartUpCounter++;
   }
   while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
-#ifdef AT32F403xx 
+#ifdef AT32F403xx
   WaitHseStbl(HSE_STABLE_DELAY);
 #endif
   if ((RCC->CTRL & RCC_CTRL_HSESTBL) != RESET)
@@ -1004,7 +1004,7 @@ static void SetSysClockTo56M(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_1;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_1;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -1071,7 +1071,7 @@ static void SetSysClockTo72M(void)
     StartUpCounter++;
   }
   while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
-#ifdef AT32F403xx 
+#ifdef AT32F403xx
   WaitHseStbl(HSE_STABLE_DELAY);
 #endif
   if ((RCC->CTRL & RCC_CTRL_HSESTBL) != RESET)
@@ -1091,7 +1091,7 @@ static void SetSysClockTo72M(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_2;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_2;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -1158,7 +1158,7 @@ static void SetSysClockTo96M(void)
     StartUpCounter++;
   }
   while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
-#ifdef AT32F403xx 
+#ifdef AT32F403xx
   WaitHseStbl(HSE_STABLE_DELAY);
 #endif
   if ((RCC->CTRL & RCC_CTRL_HSESTBL) != RESET)
@@ -1178,7 +1178,7 @@ static void SetSysClockTo96M(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_2;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_2;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -1249,7 +1249,7 @@ static void SetSysClockTo108M(void)
     StartUpCounter++;
   }
   while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
-#ifdef AT32F403xx 
+#ifdef AT32F403xx
   WaitHseStbl(HSE_STABLE_DELAY);
 #endif
   if ((RCC->CTRL & RCC_CTRL_HSESTBL) != RESET)
@@ -1269,7 +1269,7 @@ static void SetSysClockTo108M(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_3;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_3;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -1341,7 +1341,7 @@ static void SetSysClockTo120M(void)
     StartUpCounter++;
   }
   while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
-#ifdef AT32F403xx 
+#ifdef AT32F403xx
   WaitHseStbl(HSE_STABLE_DELAY);
 #endif
   if ((RCC->CTRL & RCC_CTRL_HSESTBL) != RESET)
@@ -1361,7 +1361,7 @@ static void SetSysClockTo120M(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_3;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_3;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -1440,7 +1440,7 @@ static void SetSysClockTo144M(void)
     StartUpCounter++;
   }
   while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
-#ifdef AT32F403xx 
+#ifdef AT32F403xx
   WaitHseStbl(HSE_STABLE_DELAY);
 #endif
   if ((RCC->CTRL & RCC_CTRL_HSESTBL) != RESET)
@@ -1460,7 +1460,7 @@ static void SetSysClockTo144M(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_4;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_4;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -1475,7 +1475,7 @@ static void SetSysClockTo144M(void)
 
     /*  PLL configuration: PLLCLK = HSE * 18 = 144 MHz */
     RCC->CFG &= RCC_CFG_PLLCFG_MASK;
-    
+
 #if defined (AT32F415xx)
     RCC->CFG |= (uint32_t)(RCC_CFG_PLLRC_HSE | RCC_CFG_PLLMULT18);
 #else
@@ -1539,7 +1539,7 @@ static void SetSysClockTo150M(void)
     StartUpCounter++;
   }
   while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
-#ifdef AT32F403xx 
+#ifdef AT32F403xx
   WaitHseStbl(HSE_STABLE_DELAY);
 #endif
   if ((RCC->CTRL & RCC_CTRL_HSESTBL) != RESET)
@@ -1559,7 +1559,7 @@ static void SetSysClockTo150M(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_4;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_4;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -1634,7 +1634,7 @@ static void SetSysClockTo168M(void)
     StartUpCounter++;
   }
   while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
-#ifdef AT32F403xx 
+#ifdef AT32F403xx
   WaitHseStbl(HSE_STABLE_DELAY);
 #endif
   if ((RCC->CTRL & RCC_CTRL_HSESTBL) != RESET)
@@ -1720,7 +1720,7 @@ static void SetSysClockTo176M(void)
     StartUpCounter++;
   }
   while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
-#ifdef AT32F403xx 
+#ifdef AT32F403xx
   WaitHseStbl(HSE_STABLE_DELAY);
 #endif
   if ((RCC->CTRL & RCC_CTRL_HSESTBL) != RESET)
@@ -1806,7 +1806,7 @@ static void SetSysClockTo192M(void)
     StartUpCounter++;
   }
   while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
-#ifdef AT32F403xx 
+#ifdef AT32F403xx
   WaitHseStbl(HSE_STABLE_DELAY);
 #endif
   if ((RCC->CTRL & RCC_CTRL_HSESTBL) != RESET)
@@ -1892,7 +1892,7 @@ static void SetSysClockTo200M(void)
     StartUpCounter++;
   }
   while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
-#ifdef AT32F403xx 
+#ifdef AT32F403xx
   WaitHseStbl(HSE_STABLE_DELAY);
 #endif
   if ((RCC->CTRL & RCC_CTRL_HSESTBL) != RESET)
@@ -1978,7 +1978,7 @@ static void SetSysClockTo224M(void)
     StartUpCounter++;
   }
   while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
-#ifdef AT32F403xx 
+#ifdef AT32F403xx
   WaitHseStbl(HSE_STABLE_DELAY);
 #endif
   if ((RCC->CTRL & RCC_CTRL_HSESTBL) != RESET)
@@ -2064,7 +2064,7 @@ static void SetSysClockTo240M(void)
     StartUpCounter++;
   }
   while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
-#ifdef AT32F403xx 
+#ifdef AT32F403xx
   WaitHseStbl(HSE_STABLE_DELAY);
 #endif
   if ((RCC->CTRL & RCC_CTRL_HSESTBL) != RESET)
@@ -2168,7 +2168,7 @@ static void SetSysClockTo24MHSI(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_0;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_0;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -2248,7 +2248,7 @@ static void SetSysClockTo36MHSI(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_1;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_1;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -2328,7 +2328,7 @@ static void SetSysClockTo48MHSI(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_1;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_1;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -2408,7 +2408,7 @@ static void SetSysClockTo56MHSI(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_1;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_1;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -2488,7 +2488,7 @@ static void SetSysClockTo72MHSI(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_2;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_2;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -2568,7 +2568,7 @@ static void SetSysClockTo96MHSI(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_2;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_2;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -2653,7 +2653,7 @@ static void SetSysClockTo108MHSI(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_3;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_3;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -2738,7 +2738,7 @@ static void SetSysClockTo120MHSI(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_3;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_3;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -2830,7 +2830,7 @@ static void SetSysClockTo144MHSI(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_4;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_4;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -2922,7 +2922,7 @@ static void SetSysClockTo150MHSI(void)
 
     /* Flash 1 wait state */
     FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY);
-    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_4;    
+    FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_4;
 #endif
     /* HCLK = SYSCLK */
     RCC->CFG |= (uint32_t)RCC_CFG_AHBPSC_DIV1;
@@ -3454,4 +3454,4 @@ static void SetSysClockTo240MHSI(void)
   * @}
   */
 
-/******************* (C) COPYRIGHT 2018 ArteryTek *****END OF FILE****/ 
+/******************* (C) COPYRIGHT 2018 ArteryTek *****END OF FILE****/