Merge remote-tracking branch 'china/master'

Author: BernardXiong

components/drivers/sensors/SConscript

@@ -3,10 +3,15 @@
 from building import *
 
 cwd = GetCurrentDir()
-src = Glob('*.c') + Glob('*.cpp') 
+src = ['sensor.cpp']
 CPPPATH = [cwd, cwd + '/../include']
 
+if GetDepend('SENSOR_USING_MPU6050'):
+    src += ['mpu6050_sensor.cpp'];
+
+if GetDepend('SENSOR_USING_BMI055'):
+    src += ['bmi055_sensor.cpp']
+
 group = DefineGroup('Sensors', src, depend = ['RT_USING_SENSOR', 'RT_USING_DEVICE'], CPPPATH = CPPPATH)
 
 Return('group')
-