218 lines
7.3 KiB
C
Executable file
218 lines
7.3 KiB
C
Executable file
/* $Id: xmutex_tapp_example.c,v 1.1.2.2 2011/05/12 06:42:39 sadanan Exp $ */
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/******************************************************************************
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*
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* (c) Copyright 2008-2010 Xilinx, Inc. All rights reserved.
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*
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* This file contains confidential and proprietary information of Xilinx, Inc.
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* and is protected under U.S. and international copyright and other
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* intellectual property laws.
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*
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* DISCLAIMER
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* This disclaimer is not a license and does not grant any rights to the
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* materials distributed herewith. Except as otherwise provided in a valid
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* license issued to you by Xilinx, and to the maximum extent permitted by
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* applicable law: (1) THESE MATERIALS ARE MADE AVAILABLE "AS IS" AND WITH ALL
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* FAULTS, AND XILINX HEREBY DISCLAIMS ALL WARRANTIES AND CONDITIONS, EXPRESS,
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* IMPLIED, OR STATUTORY, INCLUDING BUT NOT LIMITED TO WARRANTIES OF
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* MERCHANTABILITY, NON-INFRINGEMENT, OR FITNESS FOR ANY PARTICULAR PURPOSE;
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* and (2) Xilinx shall not be liable (whether in contract or tort, including
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* negligence, or under any other theory of liability) for any loss or damage
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* of any kind or nature related to, arising under or in connection with these
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* materials, including for any direct, or any indirect, special, incidental,
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* or consequential loss or damage (including loss of data, profits, goodwill,
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* or any type of loss or damage suffered as a result of any action brought by
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* a third party) even if such damage or loss was reasonably foreseeable or
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* Xilinx had been advised of the possibility of the same.
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*
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* CRITICAL APPLICATIONS
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* Xilinx products are not designed or intended to be fail-safe, or for use in
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* any application requiring fail-safe performance, such as life-support or
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* safety devices or systems, Class III medical devices, nuclear facilities,
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* applications related to the deployment of airbags, or any other applications
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* that could lead to death, personal injury, or severe property or
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* environmental damage (individually and collectively, "Critical
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* Applications"). Customer assumes the sole risk and liability of any use of
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* Xilinx products in Critical Applications, subject only to applicable laws
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* and regulations governing limitations on product liability.
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*
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* THIS COPYRIGHT NOTICE AND DISCLAIMER MUST BE RETAINED AS PART OF THIS FILE
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* AT ALL TIMES.
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*
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******************************************************************************/
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/******************************************************************************/
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/**
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* @file xmutex_tapp_example.c
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*
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* This file contains a design example for using the Mutex hardware and driver
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* XMutex
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*
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* The example assumes there are two processors availabile in the system that
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* are expected to inter-communicate.
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*
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* This example attempts to lock the Mutex from the processor identified as 0
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* (XPAR_CPU_ID=0) to prevent the other processor from getting the lock.
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* Since the application is running on two seperate processors, the
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* initiator declares success when the Mutex locks the other processor
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* declares success when the Mutex is locked from its perspective. There is
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* no feedback to the initiator so a terminal is required for each processor
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* to verify that the test passed for both sides.
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*
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* This example has been tested on ML505 Hardware Evaluation board.
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*
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* @note
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*
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* These code fragments will illustrate how the XMutex driver can be used to:
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* - Initialize the Mutex core
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* - Lock, Unlock and query the status of the hardware
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*
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*
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*<pre>
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* MODIFICATION HISTORY:
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*
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* Ver Who Date Changes
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* ----- ---- -------- -----------------------------------------------
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* 1.00a va First release
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* 1.00a ecm 06/04/07 Cleanup, new coding standard, check into XCS
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* 1.00a ecm 08/28/08 Converted to testapp example
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* 3.01a sdm 05/04/10 Removed printfs from the MutexExample
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*</pre>
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*******************************************************************************/
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/***************************** Include Files **********************************/
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#include "xparameters.h"
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#include "xstatus.h"
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#include "xmutex.h"
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#include <stdio.h>
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#include <stdlib.h>
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/************************** Constant Definitions *****************************/
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/*
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* The following constants map to the XPAR parameters created in the
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* xparameters.h file. They are defined here such that a user can easily
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* change all the needed parameters in one place.
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*/
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#define MUTEX_DEVICE_ID XPAR_MUTEX_0_DEVICE_ID
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#define MUTEX_NUM 0 /**< The Mutex number on which this
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* example is run
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*/
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#define LOCK_TIMEOUT 2000000 /* Number of attempts before error */
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#define printf xil_printf /* Small foot-print printf function */
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/**************************** Type Definitions *******************************/
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/***************** Macros (Inline Functions) Definitions *********************/
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/************************** Variable Definitions *****************************/
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XMutex Mutex; /* Mutex instance */
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/************************** Function Prototypes ******************************/
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int MutexExample (u16 MutexDeviceID);
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/*****************************************************************************/
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/**
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*
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* This function is the main function for the Mutex example.
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*
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* @param None.
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*
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* @return
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* - XST_SUCCESS if successful.
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* - XST_FAILURE if unsuccessful.
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*
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* @note None.
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*
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******************************************************************************/
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#ifndef TESTAPP_GEN
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int main(void)
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{
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printf ("MutexExample :\tStarts.\r\n");
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if (MutexExample (MUTEX_DEVICE_ID) != XST_SUCCESS) {
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printf ("MutexExample :\tFailed.\r\n");
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printf ("MutexExample :\tEnds.\r\n");
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return XST_FAILURE;
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}
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printf ("MutexExample :\tSucceeded.\r\n");
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printf ("MutexExample :\tEnds.\r\n");
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return XST_SUCCESS;
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}
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#endif
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/*****************************************************************************/
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/**
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* This function contains the actual functionality for the XMutex TestApp
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* example. he idea is to have this application running on two processors which
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* share the same bus and have access to the Mutex hardware. CPU 0 is considered
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* the primary CPU since it is the one which is expected to initially lock the
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* Mutex.
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*
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* @param MutexDeviceID is the device id to be initialized and used.
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*
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* @return
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* - XST_SUCCESS if successful
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* - XST_FAILURE if unsuccessful
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*
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* @note None
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*
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******************************************************************************/
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int MutexExample(u16 MutexDeviceID)
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{
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XMutex_Config *ConfigPtr;
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XStatus Status;
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u32 TimeoutCount = 0;
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/*
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* Lookup configuration data in the device configuration table.
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* Use this configuration info down below when initializing this
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* driver instance.
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*/
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ConfigPtr = XMutex_LookupConfig(MutexDeviceID);
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if (ConfigPtr == (XMutex_Config *)NULL) {
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return XST_FAILURE;
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}
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/*
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* Perform the rest of the initialization.
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*/
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Status = XMutex_CfgInitialize(&Mutex, ConfigPtr,
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ConfigPtr->BaseAddress);
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if (Status != XST_SUCCESS) {
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return XST_FAILURE;
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}
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/*
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* Depending on which CPU this is running on, either lock the
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* Mutex or test the Mutex to see if it is locked.
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*/
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if (XPAR_CPU_ID == 0) {
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XMutex_Lock(&Mutex, MUTEX_NUM); /* Acquire lock */
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XMutex_Unlock(&Mutex, MUTEX_NUM); /* Release lock */
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} else {
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/*
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* Try to acquire lock, other CPU should have it so it
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* should fail.
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*/
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while ((XMutex_Trylock(&Mutex, MUTEX_NUM)) != XST_SUCCESS) {
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if (TimeoutCount++ > LOCK_TIMEOUT) {
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return XST_FAILURE;
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}
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}
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XMutex_Unlock(&Mutex, MUTEX_NUM); /* Release lock */
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}
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return XST_SUCCESS;
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}
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