使用指针 Arduino 调用函数时出现问题

Question

我对 C++ 和 Arduino 的基础知识还很陌生，所以我坚持这个。我收到了一个函数，要包含在我的代码中，以对我正在读取的传感器值进行一些计算。我在这里和网上搜索并阅读了很多类似的主题，但没有找到任何可以帮助我解决我缺乏理解的东西。

我设置了一个带有循环的基本 Arduino 草图来读取传感器值，一切正常。然后我#included 头文件并将函数添加到循环外我的代码的底部，只是为了看看它是否会编译，它没有任何错误。所以现在需要调用该函数并将 2 个值传递给它，millis() 和我刚刚读取的传感器值。

部分头文件...

struct TCS1000v {
    unsigned short int  u16RawVal;      
    unsigned short int  u16RawValPrev;  
    unsigned short int  u16CycleTime;
    unsigned short int  u16Iso4um;      
    unsigned short int  u16Iso6um;      
    unsigned short int  u16Iso14um; 
        .....
};

typedef struct TCS1000v;

extern void vCalcCS1000v2(TCS1000v* ptCS1000, unsigned short int u16RawVal, unsigned short int u16CycleTime);

草图的循环部分

void loop() {
    // reading the sensor...
    unsigned short int u16CycleTime = millis();
    unsigned short int u16RawVal = adc.readsensor(channel);
    // the function to call - not sure about this?
    vCalcCS1000v2(TCS1000v* ptCS1000, unsigned short int u16RawVal, unsigned short int u16CycleTime)
}

提供的函数...

    void vCalcCS1000v2(TCS1000v* ptCS1000, unsigned short int u16RawVal, unsigned short int u16CycleTime)
{
    ptCS1000->u16RawVal   = u16RawVal;
    ptCS1000->u16CycleTime  = u16CycleTime;
    //.... and the rest of the code in the function
}

编译错误...

test.ino: In function 'void loop()':
cs1000:30:25: error: expected primary-expression before '*' token
   vCalcCS1000v2(TCS1000v* ptCS1000, unsigned short int u16RawVal, unsigned short int u16CycleTime)
                         ^
cs1000:30:27: error: 'ptCS1000' was not declared in this scope
   vCalcCS1000v2(TCS1000v* ptCS1000, unsigned short int u16RawVal, unsigned short int u16CycleTime)
                           ^
cs1000:30:37: error: expected primary-expression before 'unsigned'
   vCalcCS1000v2(TCS1000v* ptCS1000, unsigned short int u16RawVal, unsigned short int u16CycleTime)
                                     ^
cs1000:30:67: error: expected primary-expression before 'unsigned'
   vCalcCS1000v2(TCS1000v* ptCS1000, unsigned short int u16RawVal, unsigned short int u16CycleTime)
                                                                   ^
exit status 1
expected primary-expression before '*' token

所以头文件中设置了结构，但问题似乎出在指针上？或者我只是没有正确调用函数？

Answer 1

您在头文件中定义了一个名为 TCS1000v 的新类型，但定义不正确。使用

typedef struct {
    unsigned short int  u16RawVal;      
    unsigned short int  u16RawValPrev;  
    unsigned short int  u16CycleTime;
    unsigned short int  u16Iso4um;      
    unsigned short int  u16Iso6um;      
    unsigned short int  u16Iso14um; 
} TCS1000v;

extern void vCalcCS1000v2(TCS1000v* ptCS1000, 
                          unsigned short int u16RawVal, 
                          unsigned short int u16CycleTime);

Answer 2

最后我不得不设置一个全局变量，现在一切正常了。感谢观看:)

TCS1000v g_tCS1000v;  
vCalcCS1000v2(&(g_tCS1000v), RawVal, CycleTime);

使用指针 Arduino 调用函数时出现问题

Problem calling a function with a pointer Arduino

arduino-c++