3 files changed, 19 insertions, 19 deletions
diff --git a/components/drivers/usb/SConscript b/components/drivers/usb/SConscript
index ca80405a76..3e148cefe2 100644
--- a/components/drivers/usb/SConscript
+++ b/components/drivers/usb/SConscript
@@ -3,8 +3,8 @@ import os
 from building import *
 
 cwd     = GetCurrentDir()
-objs 	= []
-list 	= os.listdir(cwd)
+objs    = []
+list    = os.listdir(cwd)
 
 for d in list:
     path = os.path.join(cwd, d)
diff --git a/components/drivers/usb/usbdevice/SConscript b/components/drivers/usb/usbdevice/SConscript
index b6dfa8da10..3cc5bf6d43 100644
--- a/components/drivers/usb/usbdevice/SConscript
+++ b/components/drivers/usb/usbdevice/SConscript
@@ -8,28 +8,28 @@ core/usbdevice.c
 """)
 
 if GetDepend('RT_USB_DEVICE_CDC'):
-	src += Glob('class/cdc_vcom.c')
-	
+    src += Glob('class/cdc_vcom.c')
+
 if GetDepend('RT_USB_DEVICE_HID'):
     src += Glob('class/hid.c')
 
 if GetDepend('RT_USB_DEVICE_MSTORAGE'):
-	src += Glob('class/mstorage.c')
+    src += Glob('class/mstorage.c')
 
 if GetDepend('RT_USB_DEVICE_ECM'):
-	src += Glob('class/ecm.c')
+    src += Glob('class/ecm.c')
 
 if GetDepend('RT_USB_DEVICE_RNDIS'):
-	src += Glob('class/rndis.c')
+    src += Glob('class/rndis.c')
 
 if GetDepend('RT_USB_DEVICE_WINUSB'):
-	src += Glob('class/winusb.c')
-	
+    src += Glob('class/winusb.c')
+
 if GetDepend('RT_USB_DEVICE_AUDIO_MIC'):
-	src += Glob('class/audio_mic.c')
+    src += Glob('class/audio_mic.c')
 
 if GetDepend('RT_USB_DEVICE_AUDIO_SPEAKER'):
-	src += Glob('class/audio_speaker.c')
+    src += Glob('class/audio_speaker.c')
 
 CPPPATH = [cwd]
 
diff --git a/components/drivers/usb/usbhost/SConscript b/components/drivers/usb/usbhost/SConscript
index 081c732819..aa5385d52a 100644
--- a/components/drivers/usb/usbhost/SConscript
+++ b/components/drivers/usb/usbhost/SConscript
@@ -10,24 +10,24 @@ core/hub.c
 """)
 
 if GetDepend('RT_USBH_ADK'):
-	src += Glob('class/adk.c')
-	src += Glob('class/adkapp.c')
+    src += Glob('class/adk.c')
+    src += Glob('class/adkapp.c')
 
 if GetDepend('RT_USBH_MSTORAGE'):
-	src += Glob('class/mass.c')
-	src += Glob('class/udisk.c')
+    src += Glob('class/mass.c')
+    src += Glob('class/udisk.c')
 
 if GetDepend('RT_USBH_HID'):
-	src += Glob('class/hid.c')
+    src += Glob('class/hid.c')
 
 if GetDepend('RT_USBH_HID_MOUSE'):
-	src += Glob('class/umouse.c')
+    src += Glob('class/umouse.c')
 
 if GetDepend('RT_USBH_HID_KEYBOARD'):
-	src += Glob('class/ukbd.c')
+    src += Glob('class/ukbd.c')
 
 CPPPATH = [cwd, cwd + '/class', cwd + '/core', \
-	cwd + '/include', cwd + '../../../include']
+    cwd + '/include', cwd + '../../../include']
 
 group = DefineGroup('rt_usbh', src, depend = ['RT_USING_USB_HOST'], CPPPATH = CPPPATH)