我正在尝试编写一个库来使用中断来计算PWM占空比。我理解一个类成员不是attachInterrupt的正确函数格式。
但是,我尝试按Calling an ISR from a class的Nick Gammon来完成这篇文章,他有一个解决方法,但令人沮丧的是我仍然收到错误:
无法声明成员函数' static void PWMin :: risingInt()'有静态链接
有人可以对我的代码或任何其他建议的错误有所了解吗?
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