Import('RTT_ROOT')Import('rtconfig')frombuildingimport*cwd=os.path.join(str(Dir('#')),'drivers')# add the general drvers.src=Split("""board.cusart.c""")# add Ethernet drvers.ifGetDepend('RT_USING_LED'):src+=['led.c']ifGetDepend('RT_USING_SDIO'):src+=['at91_mci.c']ifGetDepend('RT_USING_LWIP'):src+=['macb.c']ifGetDepend('RT_USING_I2C')andGetDepend('RT_USING_I2C_BITOPS'):src+=['at91_i2c_gpio.c']CPPPATH=[cwd]group=DefineGroup('Drivers',src,depend=[''],CPPPATH=CPPPATH)Return('group')