/* $Id: xscugic_example.c,v 1.1.2.2 2011/03/23 07:46:43 sadanan Exp $ */
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*
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******************************************************************************/
/******************************************************************************/
/**
*
* @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_SINGLE_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 seperate 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;
}