Question

我试图在一个类中使用RtosTimer但是mbed会锁定。我想这是因为我调用threadHelper每个tick并创建一个新指针，而我实际上想调用threadMethod每个tick或每次tick都调用threadHeper但使用相同的指针。

有人能告诉我应该怎么做吗？

下面的代码适用于RtosThread，因为threadHelper只调用一次，但我需要使用Rtos Timer。

·H

#ifndef TEST_CLASS_H
#define TEST_CLASS_H

#include "mbed.h"
#include "rtos.h"

/** TestClass class.
 *  Used for demonstrating stuff.
 */
class TestClass
{
public:
    /** Create a TestClass object with the specified specifics
     *
     * @param led The LED pin.
     * @param flashRate The rate to flash the LED at in Hz.
     */
    TestClass(PinName led, float flashRate);

    /** Start flashing the LED using a Thread
     */
    void start();

private:
    //Member variables
    DigitalOut m_Led;
    float m_FlashRate;
    RtosTimer *m_rtosTimer;

    //Internal methods
    static void threadHelper(const void* arg);
    void threadMethod();
};

#endif

CPP

#include "TestClass.h"

TestClass::TestClass(PinName led, float flashRate) : m_Led(led, 0), m_FlashRate(flashRate)
{
    //NOTE: The RTOS hasn't started yet, so we can't create the internal thread here
}

void TestClass::start()
{
    m_rtosTimer = new RtosTimer(&TestClass::threadHelper, osTimerPeriodic, (void *)0);
    int updateTime = (1.0 / m_FlashRate) * 1000;
    m_rtosTimer->start(updateTime);
}

void TestClass::threadHelper(const void* arg)
{
    //Cast the argument to a TestClass instance pointer
    TestClass* instance = (TestClass*)arg;

    //Call the thread method for the TestClass instance
    instance ->threadMethod();
}

void TestClass::threadMethod()
{
    //Do some stuff
}

谢谢

Answer 1

传递给arg的{{1}}指针是您传递给threadHelper()构造函数的参数 - 在本例中是一个空指针。 RtosTimer取消引用此空指针，导致运行时错误。

相反：

threadHelper()

在类中使用RtosTimer

1 个答案: