/**
*
* Stop the watchdog timer.
*
* @param InstancePtr is a pointer to the XScuWdt instance.
*
* @return None.
*
* @note None.
*
******************************************************************************/
void XScuWdt_Stop(XScuWdt *InstancePtr)
{
u32 Register;
Xil_AssertVoid(InstancePtr != NULL);
Xil_AssertVoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
/*
* Read the contents of the Control register.
*/
Register = XScuWdt_ReadReg(InstancePtr->Config.BaseAddr,
XSCUWDT_CONTROL_OFFSET);
/*
* Clear the 'watchdog enable' bit in the register.
*/
Register &= ~XSCUWDT_CONTROL_WD_ENABLE_MASK;
/*
* Update the Control register with the new value.
*/
XScuWdt_WriteReg(InstancePtr->Config.BaseAddr,
XSCUWDT_CONTROL_OFFSET, Register);
/*
* Indicate that the device is stopped.
*/
InstancePtr->IsStarted = 0;
}
/**
*
* This function tests the functioning of the Scu Private WDT driver and hardware
* in Timer mode using interrupts.
*
* After one expiration of the timeout interval, an interrupt is generated and
* the Event flag bit is set in the watchdog interrupt status register.
*
* @param IntcInstancePtr is a pointer to the instance of the XScuGic
* driver.
* @param WdtInstancePtr is a pointer to the instance of XScuWdt driver.
* @param WdtDeviceId is the Device ID of the XScuWdt device.
* @param WdtIntrId is the Interrupt Id of the XScuWdt device.
*
* @return XST_SUCCESS if successful, otherwise XST_FAILURE.
*
* @note None.
*
******************************************************************************/
int ScuWdtIntrExample(XScuGic *IntcInstancePtr, XScuWdt * WdtInstancePtr,
u16 WdtDeviceId, u16 WdtIntrId)
{
int Status;
u32 Timebase = 0;
u32 ExpiredTimeDelta = 0;
XScuWdt_Config *ConfigPtr;
/*
* Initialize the ScuWdt driver.
*/
ConfigPtr = XScuWdt_LookupConfig(WdtDeviceId);
/*
* This is where the virtual address would be used, this example
* uses physical address.
*/
Status = XScuWdt_CfgInitialize(WdtInstancePtr, ConfigPtr,
ConfigPtr->BaseAddr);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
/*
* Perform a self-test to ensure that the hardware was built correctly.
*/
Status = XScuWdt_SelfTest(WdtInstancePtr);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
/*
* Put the watchdog timer in timer mode.
*/
XScuWdt_SetTimerMode(WdtInstancePtr);
/*
* Load the watchdog counter register.
*/
XScuWdt_LoadWdt(WdtInstancePtr, WDT_LOAD_VALUE);
/*
* Start the ScuWdt device.
*/
XScuWdt_Start(WdtInstancePtr);
/*
* Determine how long it takes for the watchdog timer to expire,
* for later processing.
*/
while (1) {
if (!(XScuWdt_IsTimerExpired(WdtInstancePtr))) {
ExpiredTimeDelta++;
} else {
break;
}
}
/*
* Stop the timer to set up the device in interrupt mode.
*/
XScuWdt_Stop(WdtInstancePtr);
/*
* Connect the device to interrupt subsystem so that interrupts
* can occur.
*/
Status = WdtSetupIntrSystem(IntcInstancePtr, WdtInstancePtr, WdtIntrId);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
/*
* Reload the watchdog counter register.
*/
XScuWdt_RestartWdt(WdtInstancePtr);
/*
* Start the ScuWdt device.
*/
HandlerCalled = 0;
XScuWdt_Start(WdtInstancePtr);
/*
* Verify that the watchdog timer does timeout when not restarted
* all the time, wait more than the amount of time it took for it
* to expire in the previous test.
*/
while (1) {
/*
* If the handler is called, the test passed
*/
if ((HandlerCalled != 0)) {
XScuWdt_WriteReg(WdtInstancePtr->Config.BaseAddr,
XSCUWDT_ISR_OFFSET,
XSCUWDT_ISR_EVENT_FLAG_MASK);
break;
}
}
/*
* Reload the watchdog counter to allow the next test to run normally.
*/
XScuWdt_RestartWdt(WdtInstancePtr);
HandlerCalled = 0;
/*
* Verify that the watchdog timer does not timeout when restarted
* all the time, wait more than the amount of time it took for it
* to expire in the previous test.
*/
while (1) {
/*
* Reload the ScuWdt each pass through the loop.
*/
XScuWdt_RestartWdt(WdtInstancePtr);
/*
* If more time has gone past than it took for it to expire
* when not restarted in the previous test, then stop as the
* restarting worked.
*/
Timebase++;
if (Timebase > ExpiredTimeDelta + ExpiredTimeDelta) {
break;
}
/*
* If the watchdog timer expired and/or handler called, then the
* test failed.
*/
if ((XScuWdt_IsTimerExpired(WdtInstancePtr)) ||
(HandlerCalled != 0)) {
/*
* Disable and disconnect the interrupt system.
*/
WdtDisableIntrSystem(IntcInstancePtr, WdtIntrId);
return XST_FAILURE;
}
}
/*
* Disable and disconnect the interrupt system.
*/
WdtDisableIntrSystem(IntcInstancePtr, WdtIntrId);
return XST_SUCCESS;
}