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am3354的GPIO:GPMC_D7-GPMC_D0能做输出用吗

Other Parts Discussed in Thread: AM3354

请教:am3354的GPIO:GPMC_D7-GPMC_D0能做输出用吗,我在board-am335xevm.c文件中配置

{"gpmc_ad7.gpio1_7", OMAP_MUX_MODE7 | AM33XX_PIN_OUTPUT}, 
{"gpmc_ad6.gpio1_6", OMAP_MUX_MODE7 | AM33XX_PIN_OUTPUT}, 
{"gpmc_ad5.gpio1_5", OMAP_MUX_MODE7 | AM33XX_PIN_OUTPUT}, 
{"gpmc_ad4.gpio1_4", OMAP_MUX_MODE7 | AM33XX_PIN_OUTPUT}, 

用来控制继电器,但是控制不了,有人帮忙回答一下吗?