如何使用结构成员作为参数

Question

I am attempting to use a member of a struct call channels to be used in higher level functions. Is is possible to have only one argument?

typedef struct {
    int size;
    Port_PadDriver padDriver; //pad driver speed
    UserConfig *pinTable;
    Port_Mode defaultmode;
    Port_State defaultstate; //set, reset, toggle port
} DefaultConfig;    

typedef struct {
    uint32 Channel;
    Port_Pin *pin;
    Port_Mode mode;
    Port_State state; //set, reset, toggle port
} UserConfig;

void IO_init(void) {
    DefaultConfig defaultConfig;//create object
    initconfig(&defaultConfig);//set init settings
    userConfig(&defaultConfig);//overwrite settings with users settings with 
a struct array
}

is it possible to create a IO_SetPinHigh(int channelnum); to be used in the IO_init(void) to change specific pins.

Answer 1

You can refer to struct members with the . operator. By doing this, you can reference this member individually like any other variable:

IO_SetPinHigh(defaultConfig.channel);

Of course, if you want to modify this variable, you'll have to pass a pointer to it:

IO_SetPinHigh(&defaultConfig.channel);