214 lines
7.2 KiB
C
Executable file
214 lines
7.2 KiB
C
Executable file
/* $Id: xwdttb_low_level_example.c,v 1.1.2.1 2009/12/04 05:52:36 svemula Exp $ */
|
|
/******************************************************************************
|
|
*
|
|
* (c) Copyright 2002-2009 Xilinx, Inc. All rights reserved.
|
|
*
|
|
* This file contains confidential and proprietary information of Xilinx, Inc.
|
|
* and is protected under U.S. and international copyright and other
|
|
* intellectual property laws.
|
|
*
|
|
* DISCLAIMER
|
|
* This disclaimer is not a license and does not grant any rights to the
|
|
* materials distributed herewith. Except as otherwise provided in a valid
|
|
* license issued to you by Xilinx, and to the maximum extent permitted by
|
|
* applicable law: (1) THESE MATERIALS ARE MADE AVAILABLE "AS IS" AND WITH ALL
|
|
* FAULTS, AND XILINX HEREBY DISCLAIMS ALL WARRANTIES AND CONDITIONS, EXPRESS,
|
|
* IMPLIED, OR STATUTORY, INCLUDING BUT NOT LIMITED TO WARRANTIES OF
|
|
* MERCHANTABILITY, NON-INFRINGEMENT, OR FITNESS FOR ANY PARTICULAR PURPOSE;
|
|
* and (2) Xilinx shall not be liable (whether in contract or tort, including
|
|
* negligence, or under any other theory of liability) for any loss or damage
|
|
* of any kind or nature related to, arising under or in connection with these
|
|
* materials, including for any direct, or any indirect, special, incidental,
|
|
* or consequential loss or damage (including loss of data, profits, goodwill,
|
|
* or any type of loss or damage suffered as a result of any action brought by
|
|
* a third party) even if such damage or loss was reasonably foreseeable or
|
|
* Xilinx had been advised of the possibility of the same.
|
|
*
|
|
* CRITICAL APPLICATIONS
|
|
* Xilinx products are not designed or intended to be fail-safe, or for use in
|
|
* any application requiring fail-safe performance, such as life-support or
|
|
* safety devices or systems, Class III medical devices, nuclear facilities,
|
|
* applications related to the deployment of airbags, or any other applications
|
|
* that could lead to death, personal injury, or severe property or
|
|
* environmental damage (individually and collectively, "Critical
|
|
* Applications"). Customer assumes the sole risk and liability of any use of
|
|
* Xilinx products in Critical Applications, subject only to applicable laws
|
|
* and regulations governing limitations on product liability.
|
|
*
|
|
* THIS COPYRIGHT NOTICE AND DISCLAIMER MUST BE RETAINED AS PART OF THIS FILE
|
|
* AT ALL TIMES.
|
|
*
|
|
******************************************************************************/
|
|
/*****************************************************************************/
|
|
/**
|
|
* @file xwdttb_low_level_example.c
|
|
*
|
|
* This file contains a design example using the low-level driver macros of
|
|
* the Watchdog Timer Timebase driver. These macros are found in xwdttb_l.h.
|
|
*
|
|
* @note
|
|
*
|
|
* None.
|
|
*
|
|
* <pre>
|
|
* MODIFICATION HISTORY:
|
|
*
|
|
* Ver Who Date Changes
|
|
* ----- ---- -------- -----------------------------------------------
|
|
* 1.00b rpm 04/26/02 First release
|
|
* 1.00b sv 04/26/05 Minor changes to comply to Doxygen and coding guidelines
|
|
* 2.00a ktn 22/10/09 Updated the example to use the HAL APIs/macros.
|
|
* The following macros defined in xwdttb_l.h file have been
|
|
* removed - XWdtTb_mEnableWdt, XWdtTb_mDisbleWdt,
|
|
* XWdtTb_mRestartWdt, XWdtTb_mGetTimebaseReg and
|
|
* XWdtTb_mHasReset.
|
|
* The example is udpated to use XWdtTb_ReadReg and
|
|
* XWdtTb_WriteReg macros to acheive the functionality of the
|
|
* macros that were removed.
|
|
* Updated this example to check for Watchdog timer reset
|
|
* condition instead of timer expiry state to avoid a race
|
|
* condition
|
|
*
|
|
*</pre>
|
|
******************************************************************************/
|
|
|
|
/***************************** Include Files *********************************/
|
|
|
|
#include "xparameters.h"
|
|
#include "xstatus.h"
|
|
#include "xwdttb_l.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 WDTTB_BASEADDR XPAR_WDTTB_0_BASEADDR
|
|
|
|
|
|
/**************************** Type Definitions *******************************/
|
|
|
|
|
|
/***************** Macros (Inline Functions) Definitions *********************/
|
|
|
|
|
|
/************************** Function Prototypes ******************************/
|
|
|
|
int XWdtTb_LowLevelExample(u32 WdtTbBaseAddress);
|
|
|
|
/************************** Variable Definitions *****************************/
|
|
|
|
|
|
/*****************************************************************************/
|
|
/**
|
|
* Main function to call the Wdttb low level example.
|
|
*
|
|
* @param None.
|
|
*
|
|
* @return XST_SUCCESS if successful, XST_FAILURE if unsuccessful.
|
|
*
|
|
* @note None.
|
|
*
|
|
******************************************************************************/
|
|
int main(void)
|
|
{
|
|
int Status;
|
|
|
|
/*
|
|
* Run the low level example, specify the Base Address that is
|
|
* generated in xparameters.h
|
|
*/
|
|
Status = XWdtTb_LowLevelExample(WDTTB_BASEADDR);
|
|
if (Status != XST_SUCCESS) {
|
|
return XST_FAILURE;
|
|
}
|
|
|
|
return XST_SUCCESS;
|
|
}
|
|
|
|
|
|
/*****************************************************************************/
|
|
/**
|
|
* This function assumes that the reset output of the watchdog timer
|
|
* timebase device is not connected to the reset of the processor. The function
|
|
* allows the watchdog timer to timeout such that a reset will occur if it is
|
|
* connected. This also assumes the interrupt output is not connected to an
|
|
* interrupt input.
|
|
*
|
|
* This function checks for Watchdog timer reset condition in two timer expiry
|
|
* state.
|
|
* This function may require some time (seconds or even minutes) to execute
|
|
* because it waits for the watchdog timer to expire.
|
|
*
|
|
* @param WdtTbBaseAddress is the base address of the device.
|
|
*
|
|
* @return XST_SUCCESS if WRS bit is not set in next two subsequent timer
|
|
* expiry state, otherwise XST_FAILURE.
|
|
*
|
|
* @note None.
|
|
*
|
|
****************************************************************************/
|
|
int XWdtTb_LowLevelExample(u32 WdtTbBaseAddress)
|
|
{
|
|
int Count = 0;
|
|
|
|
/*
|
|
* Set the registers to enable the watchdog timer, both enable bits
|
|
* in TCSR0 and TCSR1 need to be set to enable it.
|
|
* Clear the bit that indicates the reason for the last
|
|
* system reset, WRS and the WDS bit, if set, by writing
|
|
* 1's to TCSR0
|
|
*/
|
|
XWdtTb_WriteReg(WdtTbBaseAddress, XWT_TWCSR0_OFFSET,
|
|
(XWT_CSR0_WRS_MASK | XWT_CSR0_WDS_MASK |
|
|
XWT_CSR0_EWDT1_MASK));
|
|
|
|
XWdtTb_WriteReg(WdtTbBaseAddress, XWT_TWCSR1_OFFSET,
|
|
XWT_CSRX_EWDT2_MASK);
|
|
|
|
/*
|
|
* Verify Whether the WatchDog Reset Status has been set in the next two
|
|
* expiry state.
|
|
*/
|
|
while (1) {
|
|
|
|
/*
|
|
* If the watchdog timer expired, then restart it.
|
|
*/
|
|
if (XWdtTb_ReadReg(WdtTbBaseAddress, XWT_TWCSR0_OFFSET) &
|
|
XWT_CSR0_WDS_MASK) {
|
|
|
|
/*
|
|
* Restart the watchdog timer as a normal application
|
|
* would
|
|
*/
|
|
XWdtTb_WriteReg(WdtTbBaseAddress, XWT_TWCSR0_OFFSET,
|
|
(XWT_CSR0_WRS_MASK | XWT_CSR0_WDS_MASK |
|
|
XWT_CSR0_EWDT1_MASK));
|
|
Count++;
|
|
}
|
|
|
|
/*
|
|
* Check whether the WatchDog Reset Status has been set.
|
|
* If this is set means then the test has failed
|
|
*/
|
|
if (XWdtTb_ReadReg(WdtTbBaseAddress, XWT_TWCSR0_OFFSET) &
|
|
XWT_CSR0_WRS_MASK) {
|
|
return XST_FAILURE;
|
|
}
|
|
|
|
/*
|
|
* Check whether the WatchDog timer expires two times.
|
|
* If the timer expires two times then the test is passed.
|
|
*/
|
|
if(Count == 2) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
return XST_SUCCESS;
|
|
|
|
}
|
|
|