关于结构体pin_desc的解释

sdwhlcf

struct pin_desc {
        char *name;
        unsigned int id;
        enum pin_fun fun;
        enum pad_strength strength;
        enum pad_voltage voltage;
        unsigned pullup:1;
        unsigned drive:1;
        unsigned pull:1;
        unsigned output:1;
        unsigned data:1;
};

该结构体终端的pullup，drive，pull怎么用啊，如何来定义，不知道这几个变量的用法，谁给解释一下！

MMMIX

struct pin_desc {
        char *name;
        unsigned int id;
        enum pin_fun fun;
        enum pad_strength strength; ...
sdwhlcf 发表于 2011-08-22 18:23

    Google 'bit field' 了解下它的用法。http://en.wikipedia.org/wiki/Bit_field