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怎样查看或设置GPIO口的工作模式

shanshan wan
Intellectual 421 points


我是用的ANGSTROM系统，我参照http://processors.wiki.ti.com/index.php/GPIO_Driver_Guide的echo 30 > /sys/class/gpio/export 方法来控制我beaglebone black的IO口，请问这样控制的GPIO口，是否设置了上拉或者下拉电阻，或是禁用了上下拉，怎样查看？怎样来禁用GPIO口的我上下拉电阻？