Question

我是新手用C ++创建类，我无法看到我在以下代码中犯的错误。
我只想在每次调用ISR时递增变量 cnt ，并在调用 stopTimer 时返回。
这是AllTimer.cpp

#include "avr/interrupt.h"  
#include "Arduino.h"
#include "util/delay.h"  
#include "AllTimer.h"

AllTimer::AllTimer()
{  
}   
static int cnt;  
void AllTimer::dofun(void)  
{

//TCCR1B = 0X00;        //stop the timer

digitalWrite(13,!digitalRead(13));
TCNT1 = 0X001F;
cnt = cnt+1;
//TCCR1B |= (1<<CS12) && (1<<CS10); //start the timer

}

int AllTimer::stopTimer()
{
    TCCR1B = 0X00;
    return(cnt);
}

void AllTimer::setTimer(void)
{
    TCNT1 = 0x001F;
    TCCR1A = 0x00;
    TCCR1B = 0x00;
    TCCR1B |= 0x03;
    TIMSK1 |= (1<<TOIE1);
    cnt = 0;
    sei();
 }
 ISR(TIMER1_OVF_vect)
 {
    AllTimer::dofun();
 }

标题文件：

#ifndef AllTimer_h
#define AllTimer_h

class AllTimer{
public:
    AllTimer();
    static void setTimer(void);
    static void dofun(void);
    static int stopTimer(void);
private:
    static int cnt;
};

#endif

arduino IDE中的代码：

#include <AllTimer.h>

AllTimer mytimer;

void setup()
{
    pinMode(13,OUTPUT);
    Serial.begin(9600);
    mytimer.setTimer();

}

 void loop()
 {
      delay(1000);
      int x = mytimer.stopTimer();
      Serial.println("x is: "); 
     Serial.print(x);
}

编译时，这是错误：
AllTimer / Alltimer.cpp.o：在函数__vector_13': /usr/share/arduino/libraries/AllTimer/Alltimer.cpp:43: undefined reference to AllTimer :: cnt'中 /usr/share/arduino/libraries/AllTimer/Alltimer.cpp:44：对AllTimer::cnt' /usr/share/arduino/libraries/AllTimer/Alltimer.cpp:44: undefined reference to AllTimer :: cnt'的未定义引用 /usr/share/arduino/libraries/AllTimer/Alltimer.cpp:44：对AllTimer::cnt' /usr/share/arduino/libraries/AllTimer/Alltimer.cpp:44: undefined reference to AllTimer :: cnt'的未定义引用 AllTimer / Alltimer.cpp.o:/usr/share/arduino/libraries/AllTimer/Alltimer.cpp:44：对“AllTimer :: cnt”的更多未定义引用关注 collect2：错误：ld返回1退出状态

未定义的对c ++中变量的引用

0 个答案: