/**
*
* This function does a minimal test on the TmrCtr device and driver as a
* design example. The purpose of this function is to illustrate
* how to use the XTmrCtr component.
*
*
* @param DeviceId is the XPAR_<TMRCTR_instance>_DEVICE_ID value from
* xparameters.h
* @param TmrCtrNumber is the timer counter of the device to operate on.
* Each device may contain multiple timer counters.
* The timer number is a zero based number with a range of
* 0 - (XTC_DEVICE_TIMER_COUNT - 1).
*
* @return XST_SUCCESS if successful, XST_FAILURE if unsuccessful
*
* @note None
*
****************************************************************************/
int TmrCtrSelfTestExample(u16 DeviceId, u8 TmrCtrNumber)
{
int Status;
XTmrCtr *TmrCtrInstancePtr = &TimerCounter;
/*
* Initialize the TmrCtr driver so that it iss ready to use
*/
Status = XTmrCtr_Initialize(TmrCtrInstancePtr, DeviceId);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
/*
* Perform a self-test to ensure that the hardware was built
* correctly, use the 1st timer in the device (0)
*/
Status = XTmrCtr_SelfTest(TmrCtrInstancePtr, TmrCtrNumber);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
return XST_SUCCESS;
}
/**
* This function does a minimal test on the timer counter device and driver as a
* design example. The purpose of this function is to illustrate how to use the
* XTmrCtr component. It initializes a timer counter and then sets it up in
* compare mode with auto reload such that a periodic interrupt is generated.
*
* This function uses interrupt driven mode of the timer counter.
*
* @param IntcInstancePtr is a pointer to the Interrupt Controller
* driver Instance
* @param TmrCtrInstancePtr is a pointer to the XTmrCtr driver Instance
* @param DeviceId is the XPAR_<TmrCtr_instance>_DEVICE_ID value from
* xparameters.h
* @param IntrId is XPAR_<INTC_instance>_<TmrCtr_instance>_VEC_ID
* value from xparameters.h
* @param TmrCtrNumber is the number of the timer to which this
* handler is associated with.
*
* @return
* - XST_SUCCESS if the Test is successful
* - XST_FAILURE if the Test is not successful
*
* @note This function contains an infinite loop such that if interrupts
* are not working it may never return.
*
*****************************************************************************/
int TmrCtrFastIntrExample(XIntc* IntcInstancePtr,
XTmrCtr* TmrCtrInstancePtr,
u16 DeviceId,
u16 IntrId,
u8 TmrCtrNumber)
{
int Status;
int LastTimerExpired = 0;
/*
* Initialize the timer counter so that it's ready to use,
* specify the device ID that is generated in xparameters.h
*/
Status = XTmrCtr_Initialize(TmrCtrInstancePtr, DeviceId);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
/*
* Perform a self-test to ensure that the hardware was built
* correctly, use the 1st timer in the device (0)
*/
Status = XTmrCtr_SelfTest(TmrCtrInstancePtr, TmrCtrNumber);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
/*
* Connect the timer counter to the interrupt subsystem such that
* interrupts can occur. This function is application specific.
*/
Status = TmrCtrSetupIntrSystem(IntcInstancePtr,
TmrCtrInstancePtr,
DeviceId,
IntrId,
TmrCtrNumber);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
/*
* Setup the handler for the timer counter that will be called from the
* interrupt context when the timer expires, specify a pointer to the
* timer counter driver instance as the callback reference so the
* handler is able to access the instance data
*/
XTmrCtr_SetHandler(TmrCtrInstancePtr, TimerCounterHandler,
TmrCtrInstancePtr);
/*
* Enable the interrupt of the timer counter so interrupts will occur
* and use auto reload mode such that the timer counter will reload
* itself automatically and continue repeatedly, without this option
* it would expire once only
*/
XTmrCtr_SetOptions(TmrCtrInstancePtr, TmrCtrNumber,
XTC_INT_MODE_OPTION | XTC_AUTO_RELOAD_OPTION);
/*
* Set a reset value for the timer counter such that it will expire
* eariler than letting it roll over from 0, the reset value is loaded
* into the timer counter when it is started
*/
XTmrCtr_SetResetValue(TmrCtrInstancePtr, TmrCtrNumber, RESET_VALUE);
/*
* Start the timer counter such that it's incrementing by default,
* then wait for it to timeout a number of times
*/
XTmrCtr_Start(TmrCtrInstancePtr, TmrCtrNumber);
while (1) {
/*
* Wait for the first timer counter to expire as indicated by
* the shared variable which the handler will increment
*/
while (TimerExpired == LastTimerExpired) {
}
LastTimerExpired = TimerExpired;
/*
* If it has expired a number of times, then stop the timer
* counter and stop this example
*/
if (TimerExpired == 3) {
XTmrCtr_Stop(TmrCtrInstancePtr, TmrCtrNumber);
break;
}
}
TmrCtrDisableIntr(IntcInstancePtr, DeviceId);
return XST_SUCCESS;
}
/****************************************************************************
*
* FUNCTION:
*
* main
*
* DESCRIPTION:
*
* This is the entry point for the example. The embedded system automatically
* calls main.
*
* ARGUMENTS:
*
* None.
*
* RETURN VALUE:
*
* None.
*
* NOTES:
*
* None.
*
****************************************************************************/
int main() {
XStatus Status;
int PreviousCount = 0;
/* Using printf with the UART Lite assumes that the layer 0 device
* driver was selected for the UART Lite in the XPS and the standard
* I/O peripheral in XPS was set to the UART Lite
*/printf("\n\rStarting the Application\n\r");
/*************************** GPIO Setup *******************************/
/* The second GPIO example uses the higher level (layer 1) driver to
* blink the LEDs, First initialize the GPIO component
*/
Status = XGpio_Initialize(&Gpio, XPAR_AXI_GPIO_0_DEVICE_ID);
if (Status != XST_SUCCESS) {
printf("GPIO initialization error\n\r\r");
}
/* Set the direction for all signals to be inputs except the LED
* outputs
*/
XGpio_SetDataDirection(&Gpio, 1, ~LED);
/************************* Timer Setup ********************************/
/* Initialize the timer counter so that it's ready to use,
* specify the device ID that is generated in xparameters.h
*/
Status = XTmrCtr_Initialize(&TimerCounter, XPAR_AXI_TIMER_0_DEVICE_ID);
if (Status != XST_SUCCESS) {
printf("Timer counter initialization error\n\r\r");
}
/* Perform a self-test to ensure that the hardware was built
* correctly, use the 1st timer in the device (0)
*/
Status = XTmrCtr_SelfTest(&TimerCounter, TIMER_COUNTER_0);
if (Status != XST_SUCCESS) {
printf("Timer counter self-test error\n\r");
}
/* Setup the handler for the timer counter that will be called from the
* interrupt context when the timer expires, specify a pointer to the
* timer counter driver instance as the callback reference so the handler
* is able to access the instance data
*/
XTmrCtr_SetHandler(&TimerCounter, TimerCounterHandler, &TimerCounter);
/* Enable the interrupt of the timer counter so interrupts will occur
* and use auto reload mode such that the timer counter will reload
* itself automatically and continue repeatedly, without this option
* it would expire once only
*/
XTmrCtr_SetOptions(&TimerCounter, TIMER_COUNTER_0,
XTC_INT_MODE_OPTION | XTC_AUTO_RELOAD_OPTION);
/* Set a reset value for the timer counter such that it will expire
* earlier than letting it roll over from 0, the reset value is loaded
* into the timer counter when it is started
*/
XTmrCtr_SetResetValue(&TimerCounter, TIMER_COUNTER_0, resetTime /*RESET_VALUE*/);
/* Start the timer counter such that it's incrementing
*/
XTmrCtr_Start(&TimerCounter, TIMER_COUNTER_0);
/********************** Interrupt Controller Setup *********************/
/*
* Initialize the interrupt controller driver so that it's ready to use,
* using the device ID that is generated in xparameters.h
*/
Status = XIntc_Initialize(&InterruptController, XPAR_AXI_INTC_0_DEVICE_ID);
if (Status != XST_SUCCESS) {
printf("Interrupt controller initialization error\n\r");
}
/*
* Connect the 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 = XIntc_Connect(&InterruptController,
XPAR_AXI_INTC_0_AXI_TIMER_0_INTERRUPT_INTR, // we don't know what this is, but it's probably 0
(XInterruptHandler) XTmrCtr_InterruptHandler, &TimerCounter);
if (Status != XST_SUCCESS) {
printf("Interrupt controller connect error\n\r");
}
/*
* Start the interrupt controller so interrupts are enabled for all
* devices that cause interrupts. Specify real mode so that the timer
* counter can cause interrupts through the interrupt controller.
*/
Status = XIntc_Start(&InterruptController, XIN_REAL_MODE);
if (Status != XST_SUCCESS) {
printf("Interrupt controller start error\n\r");
}
/* Enable the interrupt for the timer counter and enable interrupts in
* the microblaze processor
*/
XIntc_Enable(&InterruptController,
XPAR_AXI_INTC_0_AXI_TIMER_0_INTERRUPT_INTR);
microblaze_enable_interrupts();
/********************** Application Processing *********************/
/* Insert foreground processing here, interrupts will handle
* processing in the background
*/
while (1) {
char get = (char)*(volatile int *)(XPAR_RS232_UART_1_BASEADDR);
if (get >= ' ' && get <= '~')
break;
}
// stop the timer
microblaze_disable_interrupts();
// break out of the while look
/* The application should not ever execute the following code, but it is
* present to indicate if the application does exit because of an error
*/printf("Exiting the Application\n\r");
}
