Xilinx 中断函数配置

/****************************************************************************

* Copyright (C) 2010 - 2020 Xilinx, Inc.  All rights reserved.
* SPDX-License-Identifier: MIT
  ******************************************************************************/

/******************************************************************************/
/**
*

* @file xscugic_example.c
  *

* This file contains a design example using the Interrupt Controller driver

* (XScuGic) and hardware device. Please reference other device driver examples

* to see more examples of how the intc and interrupts can be used by a software

* application.
  *

* @note
  *

* None
  *

* <pre>
  *

* MODIFICATION HISTORY:

* Ver   Who  Date     Changes

* ----- ---- -------- ----------------------------------------------------

* 1.00a drg  01/18/10 First release

* </pre>
  ******************************************************************************/

/***************************** Include Files *********************************/

#include <stdio.h>
#include <stdlib.h>
#include "xil_io.h"
#include "xil_exception.h"
#include "xparameters.h"
#include "xil_cache.h"
#include "xil_printf.h"
#include "xil_types.h"
#include "xscugic.h"

/************************** Constant Definitions *****************************/

/*

 * The following constants map to the XPAR parameters created in the
 * xparameters.h file. They are defined here such that a user can easily
 * change all the needed parameters in one place.
   */
   #define INTC_DEVICE_ID		XPAR_SCUGIC_0_DEVICE_ID
   #define INTC_DEVICE_INT_ID	0x0E

/**************************** Type Definitions *******************************/

/***************** Macros (Inline Functions) Definitions *********************/

/************************** Function Prototypes ******************************/
int ScuGicExample(u16 DeviceId);
int SetUpInterruptSystem(XScuGic *XScuGicInstancePtr);
void DeviceDriverHandler(void *CallbackRef);

/************************** Variable Definitions *****************************/

XScuGic InterruptController; 	     /* Instance of the Interrupt Controller */
static XScuGic_Config *GicConfig;    /* The configuration parameters of the
                                       controller */

/*

 * Create a shared variable to be used by the main thread of processing and
 * the interrupt processing
   */
   volatile static int InterruptProcessed = FALSE;

static void AssertPrint(const char8 *FilenamePtr, s32 LineNumber){
	xil_printf("ASSERT: File Name: %s ", FilenamePtr);
	xil_printf("Line Number: %d\r\n",LineNumber);
}

/*****************************************************************************/
/**
*

* This is the main function for the Interrupt Controller example.
  *
* @param	None.
  *
* @return	XST_SUCCESS to indicate success, otherwise XST_FAILURE.
  *
* @note		None.
  *
  ****************************************************************************/
  int main(void)
  {
  int Status;


	/*
	 * Setup an assert call back to get some info if we assert.
	 */
	Xil_AssertSetCallback(AssertPrint);
	
	xil_printf("GIC Example Test\r\n");
	
	/*
	 *  Run the Gic example , specify the Device ID generated in xparameters.h
	 */
	Status = ScuGicExample(INTC_DEVICE_ID);
	if (Status != XST_SUCCESS) {
		xil_printf("GIC Example Test Failed\r\n");
		return XST_FAILURE;
	}
	
	xil_printf("Successfully ran GIC Example Test\r\n");
	return XST_SUCCESS;

}

/*****************************************************************************/
/**
*

* This function is an example of how to use the interrupt controller driver

* (XScuGic) and the hardware device.  This function is designed to

* work without any hardware devices to cause interrupts. It may not return

* if the interrupt controller is not properly connected to the processor in

* either software or hardware.
  *

* This function relies on the fact that the interrupt controller hardware

* has come out of the reset state such that it will allow interrupts to be

* simulated by the software.
  *

* @param	DeviceId is Device ID of the Interrupt Controller Device,

* typically XPAR_<INTC_instance>_DEVICE_ID value from

* xparameters.h
  *

* @return	XST_SUCCESS to indicate success, otherwise XST_FAILURE
  *

* @note		None.
  *
  ******************************************************************************/
  int ScuGicExample(u16 DeviceId)
  {
  int Status;

  /*

   * Initialize the interrupt controller driver so that it is ready to
   * use.
     */
     GicConfig = XScuGic_LookupConfig(DeviceId);
     if (NULL == GicConfig) {
     return XST_FAILURE;
     }

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


	/*
	 * Perform a self-test to ensure that the hardware was built
	 * correctly
	 */
	Status = XScuGic_SelfTest(&InterruptController);
	if (Status != XST_SUCCESS) {
		return XST_FAILURE;
	}


	/*
	 * Setup the Interrupt System
	 */
	Status = SetUpInterruptSystem(&InterruptController);
	if (Status != XST_SUCCESS) {
		return XST_FAILURE;
	}
	
	/*
	 * Connect a device driver handler that will be called when an
	 * interrupt for the device occurs, the device driver handler performs
	 * the specific interrupt processing for the device
	 */
	Status = XScuGic_Connect(&InterruptController, INTC_DEVICE_INT_ID,
			   (Xil_ExceptionHandler)DeviceDriverHandler,
			   (void *)&InterruptController);
	
	if (Status != XST_SUCCESS) {
		return XST_FAILURE;
	}
	
	/*
	 * Enable the interrupt for the device and then cause (simulate) an
	 * interrupt so the handlers will be called
	 */
	XScuGic_Enable(&InterruptController, INTC_DEVICE_INT_ID);
	
	/*
	 *  Simulate the Interrupt
	 */
	Status = XScuGic_SoftwareIntr(&InterruptController,
					INTC_DEVICE_INT_ID,
					XSCUGIC_SPI_CPU0_MASK);
	if (Status != XST_SUCCESS) {
		return XST_FAILURE;
	}
	
	/*
	 * Wait for the interrupt to be processed, if the interrupt does not
	 * occur this loop will wait forever
	 */
	while (1) {
		/*
		 * If the interrupt occurred which is indicated by the global
		 * variable which is set in the device driver handler, then
		 * stop waiting
		 */
		if (InterruptProcessed) {
			break;
		}
	}
	
	return XST_SUCCESS;

}

/******************************************************************************/
/**
*

* This function connects the interrupt handler of the interrupt controller to

* the processor.  This function is separate to allow it to be customized for

* each application.  Each processor or RTOS may require unique processing to

* connect the interrupt handler.
  *

* @param	XScuGicInstancePtr is the instance of the interrupt controller

* that needs to be worked on.
  *

* @return	None.
  *

* @note		None.
  *
  ****************************************************************************/
  int SetUpInterruptSystem(XScuGic *XScuGicInstancePtr)
  {

  /*

   * Connect the interrupt controller interrupt handler to the hardware
   * interrupt handling logic in the ARM processor.
     */
     Xil_ExceptionRegisterHandler(XIL_EXCEPTION_ID_INT,
     	(Xil_ExceptionHandler) XScuGic_InterruptHandler,
     	XScuGicInstancePtr);

  /*

   * Enable interrupts in the ARM
     */
     Xil_ExceptionEnable();

  return XST_SUCCESS;
  }

/******************************************************************************/
/**
*

* This function is designed to look like an interrupt handler in a device
* driver. This is typically a 2nd level handler that is called from the
* interrupt controller interrupt handler.  This handler would typically
* perform device specific processing such as reading and writing the registers
* of the device to clear the interrupt condition and pass any data to an
* application using the device driver.  Many drivers already provide this
* handler and the user is not required to create it.
  *
* @param	CallbackRef is passed back to the device driver's interrupt
* handler by the XScuGic driver.  It was given to the XScuGic
* driver in the XScuGic_Connect() function call.  It is typically
* a pointer to the device driver instance variable.
* In this example, we do not care about the callback
* reference, so we passed it a 0 when connecting the handler to
* the XScuGic driver and we make no use of it here.
  *
* @return	None.
  *
* @note		None.
  *
  ****************************************************************************/
  void DeviceDriverHandler(void *CallbackRef)
  {
  /*
   * Indicate the interrupt has been processed using a shared variable
     */
     InterruptProcessed = TRUE;
     }