Xilinx MicroBlaze中断定时器代码

以下是Xilinx MicroBlaze中断定时器的代码示例：

#include <stdio.h>
#include "xparameters.h"
#include "xil_exception.h"
#include "xtmrctr_l.h"

#define TMRCTR_DEVICE_ID XPAR_TMRCTR_0_DEVICE_ID
#define INTC_DEVICE_ID XPAR_INTC_0_DEVICE_ID
#define TMRCTR_INTERRUPT_ID XPAR_INTC_0_TMRCTR_0_VEC_ID

volatile int TimerExpired;

void TimerCounterHandler(void *CallBackRef, u8 TmrCtrNumber)
{
    if (XTmrCtr_IsExpired(CallBackRef, TmrCtrNumber))
    {
        XTmrCtr_Reset(CallBackRef, TmrCtrNumber);
        TimerExpired = 1;
    }
}

int SetupInterruptSystem(XTmrCtr *InstancePtr, u16 DeviceId, u16 IntrId)
{
    int Status;

    XScuGic_Config *IntcConfig;
    Xil_ExceptionInit();

    IntcConfig = XScuGic_LookupConfig(DeviceId);
    Status = XScuGic_CfgInitialize(&InterruptController, IntcConfig, IntcConfig->CpuBaseAddress);
    if (Status != XST_SUCCESS)
    {
        return XST_FAILURE;
    }

    Xil_ExceptionRegisterHandler(XIL_EXCEPTION_ID_INT, (Xil_ExceptionHandler)XScuGic_InterruptHandler, &InterruptController);
    XScuGic_Connect(&InterruptController, IntrId, (Xil_ExceptionHandler)TimerCounterHandler, (void *)InstancePtr);
    XScuGic_Enable(&InterruptController, IntrId);
    XTmrCtr_SetHandler(InstancePtr, TimerCounterHandler, InstancePtr);
    XTmrCtr_SetOptions(InstancePtr, 0, XTC_INT_MODE_OPTION | XTC_AUTO_RELOAD_OPTION);
    XTmrCtr_Start(InstancePtr, 0);

    Xil_ExceptionEnableMask(XIL_EXCEPTION_IRQ);

    return XST_SUCCESS;
}

int main()
{
    int Status;
    XTmrCtr TimerCounterInstancePtr;
    u32 TicksPerSecond = XPAR_AXI_TIMER_0_CLOCK_FREQ_HZ / 2;
    u32 TimerLoadValue = TicksPerSecond / 2;

    Status = XTmrCtr_Initialize(&TimerCounterInstancePtr, TMRCTR_DEVICE_ID);
    if (Status != XST_SUCCESS)
    {
        return XST_FAILURE;
    }

    Status = SetupInterruptSystem(&TimerCounterInstancePtr, INTC_DEVICE_ID, TMRCTR_INTERRUPT_ID);
    if (Status != XST_SUCCESS)
    {
        return XST_FAILURE;
    }

    XTmrCtr_SetResetValue(&TimerCounterInstancePtr, 0, TimerLoadValue);
    XTmrCtr_Start(&TimerCounterInstancePtr, 0);

    while (1)
    {
        if (TimerExpired)
        {
            printf("Timer expired!\n");
            TimerExpired = 0;
        }
    }

    return 0;
}