我正在尝试编写一个库来使用中断计算 PWM 占空比。我知道类成员不是 attachInterrupt 的正确函数格式。
但是,我已经尝试关注这个帖子Calling an ISR from a class通过 Nick Gammon ,谁有解决办法,但令人沮丧的是我仍然收到错误:
cannot declare member function 'static void PWMin::risingInt()' to have static linkage
有人可以阐明我的代码有什么问题或任何其他建议吗?
这是cpp文件:
#include "PWMin.h"
PWMin::PWMin(int intPin, int* outputTime, bool direction=true){
instance = this;
this->_intPin = intPin;
this->_outputTime = outputTime;
this->_direction = direction;
pinMode(this->_intPin, INPUT);
attachInt();
}
void PWMin::attachInt(){
attachInterrupt(this->_intPin, this->_direction ? risingInt : fallingInt, this->_direction ? RISING : FALLING);
}
void PWMin::risingISR(){
this->start = micros();
this->_direction = false;
this->attachInt();
}
void PWMin::fallingISR(){
this->timeElapsed = micros() - this->start;
*_outputTime = this->timeElapsed;
this->_direction = true;
this->attachInt();
}
unsigned long PWMin::lastElapsedTime(){
return this->timeElapsed;
}
static void PWMin::risingInt(){
if(PWMin::instance != NULL){
PWMin::instance->risingISR();
}
}
static void PWMin::fallingInt(){
if(PWMin::instance != NULL){
PWMin::instance->fallingISR();
}
}
这是头文件:
#ifndef PWMin_h
#define PWMin_h
class PWMin {
public:
PWMin(int intPin, int* outputTime, bool direction);
unsigned long lastElapsedTime();
private:
static PWMin *instance;
int _intPin;
int* _outputTime;
bool _direction;
unsigned long start, timeElapsed;
void attachInt();
void risingISR();
void fallingISR();
static void risingInt();
static void fallingInt();
};
#endif /* PWMin_h */
谢谢, 肖恩
最佳答案
在头文件中,您已将函数声明为 static
,因此无需在 .cpp 文件中再次声明。
类似问题有个很好的回答here进一步澄清原因。
关于c++ - 类内中断,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/37287468/