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/*****************************************************************************/
/**
* @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;
}