C++变量在中断期间更改，中断后重置

我正在尝试使用一个标志来查看事件是否已经完成。

通过调试器，我已经看到中断正确触发，并且确实将transmitCompleteI2c的值设置为1。当我返回if语句检查标志是否已设置为1时，它已重置为0。

我更改transmitCompleteI2c值的仅有两个位置位于if语句之后和中断例程中。

我正在运行以下代码。transmitCompleteI2c的声明是在类的头文件中完成的。CCD_ 4是类CCD_ 5的成员函数。

volatile uint8_t transmitCompleteI2c;
void I2c::foo() {
    if (transmitCompleteI2c) {
        transmitCompleteI2c = 0;
        // trigger event which sets transmitComplete back to 0 when done
        fireEvent();
    }
}
void I2c::sendHandler(XIic *InstancePtr) {
    transmitCompleteI2c = 1;
}

经过大量挖掘，发现中断例程写入transmitCompleteI2c的地址与类中的变量不同。即使在重命名变量之后，这种情况仍然存在。下面是我的类的头文件和源代码。

头文件：

#define SLAVE_ADDRESS   0xA0/2
#define SEND_COUNT      16
#define RECEIVE_COUNT   16
#define IIC_INTR_ID     XPAR_FABRIC_AXI_IIC_0_IIC2INTC_IRPT_INTR
#define IIC_DEVICE_ID   XPAR_AXI_IIC_0_DEVICE_ID
#define INTC_DEVICE_ID  XPAR_SCUGIC_SINGLE_DEVICE_ID

class I2c{
private:
    void sendHandler(void* InstancePtr, int);
    void receiveHandler(XIic* InstancePtr, int);
    void statusHandler(XIic* InstancePtr, int);
    XIic_Config* configPtr;
    const XScuGic& intcInterrupt;
    XIic iicDevice;
    int status;
    uint8_t writeBuffer[SEND_COUNT];
    uint8_t readBuffer[RECEIVE_COUNT];
    volatile uint8_t transmitCompleteI2c, receiveComplete;
    volatile bool test;    
public:
    I2c() : intcInterrupt{IntcInstance} {};
    uint8_t initialize();
    int writeData(u16 ByteCount);
    int readData(u8 *BufferPtr, u16 ByteCount);    
};

实施：初始化功能：

uint8_t I2c::initialize() {
    // init driver
    configPtr = XIic_LookupConfig(IIC_DEVICE_ID);
    XIic_CfgInitialize(&iicDevice, configPtr, configPtr->BaseAddress);

    //init interrupt system
    XScuGic_SetPriorityTriggerType((XScuGic*) &intcInterrupt, IIC_INTR_ID, 0xA0, 0x3);
    status = XScuGic_Connect((XScuGic*) &intcInterrupt, IIC_INTR_ID, (Xil_ExceptionHandler) XIic_InterruptHandler, &iicDevice);
    XScuGic_Enable((XScuGic*) &intcInterrupt, IIC_INTR_ID);
    Xil_ExceptionInit();
    Xil_ExceptionRegisterHandler(XIL_EXCEPTION_ID_IRQ_INT, (Xil_ExceptionHandler) XScuGic_InterruptHandler, &IntcInstance);
    Xil_ExceptionEnable();
    // set transmit flag
    transmitCompleteI2c = true;
    xil_printf("%08xn", &transmitCompleteI2c);
    // attach interrupts to i2c device
    XIic_SetSendHandler(&iicDevice, &iicDevice, (XIic_Handler) (&I2c::sendHandler));
    XIic_SetRecvHandler(&iicDevice, &iicDevice, (XIic_Handler) &I2c::receiveHandler);
    XIic_SetStatusHandler(&iicDevice, &iicDevice, (XIic_StatusHandler) &I2c::statusHandler);
    // set slave address
    status = XIic_SetAddress(&iicDevice, XII_ADDR_TO_SEND_TYPE, SLAVE_ADDRESS);
    // start device
    status = XIic_Start(&iicDevice);
    if (status != XST_SUCCESS) {
        return XST_FAILURE;
    }
    return 0;
}

写入数据功能：

int I2c::writeData(u16 ByteCount) {
    xil_printf("%08xn", &transmitCompleteI2c);
    /*
     * Set flag
     */
    transmitCompleteI2c = false;
    /*
     * Send the data
     */
    status = XIic_MasterSend(&iicDevice, &writeBuffer[0], 6);
    if (status != XST_SUCCESS) {
        xil_printf("%dn", status);
        return XST_FAILURE;
    }
    return XST_SUCCESS;
}

中断例程：

void I2c::sendHandler(void *InstancePtr, int byteCount) {
    transmitCompleteI2c = true;
    xil_printf("%08xn", &transmitCompleteI2c);
}