Beispiel #1
0
/**
*
* Starts the specified timer counter of the device such that it starts running.
* The timer counter is reset before it is started and the reset value is
* loaded into the timer counter.
*
* If interrupt mode is specified in the options, it is necessary for the caller
* to connect the interrupt handler of the timer/counter to the interrupt source,
* typically an interrupt controller, and enable the interrupt within the
* interrupt controller.
*
* @param	InstancePtr is a pointer to the XTmrCtr instance.
* @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	None.
*
* @note		None.
*
******************************************************************************/
void XTmrCtr_Start(XTmrCtr * InstancePtr, u8 TmrCtrNumber)
{
	u32 ControlStatusReg;

	Xil_AssertVoid(InstancePtr != NULL);
	Xil_AssertVoid(TmrCtrNumber < XTC_DEVICE_TIMER_COUNT);
	Xil_AssertVoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);

	/*
	 * Read the current register contents such that only the necessary bits
	 * of the register are modified in the following operations
	 */
	ControlStatusReg = XTimerCtr_ReadReg(InstancePtr->BaseAddress,
					      TmrCtrNumber, XTC_TCSR_OFFSET);
	/*
	 * Reset the timer counter such that it reloads from the compare
	 * register and the interrupt is cleared simultaneously, the interrupt
	 * can only be cleared after reset such that the interrupt condition is
	 * cleared
	 */
	XTmrCtr_WriteReg(InstancePtr->BaseAddress, TmrCtrNumber,
			  XTC_TCSR_OFFSET,
			  XTC_CSR_LOAD_MASK);

	/*
	 * Remove the reset condition such that the timer counter starts running
	 * with the value loaded from the compare register
	 */
	XTmrCtr_WriteReg(InstancePtr->BaseAddress, TmrCtrNumber,
			  XTC_TCSR_OFFSET,
			  ControlStatusReg | XTC_CSR_ENABLE_TMR_MASK);
}
Beispiel #2
0
/**
*
* Returns the timer counter value that was captured the last time the external
* capture input was asserted.
*
* @param	InstancePtr is a pointer to the XTmrCtr instance.
* @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	The current capture value for the indicated timer counter.
*
* @note		None.
*
*******************************************************************************/
u32 XTmrCtr_GetCaptureValue(XTmrCtr * InstancePtr, u8 TmrCtrNumber)
{

	Xil_AssertNonvoid(InstancePtr != NULL);
	Xil_AssertNonvoid(TmrCtrNumber < XTC_DEVICE_TIMER_COUNT);
	Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);

	return XTimerCtr_ReadReg(InstancePtr->BaseAddress,
				  TmrCtrNumber, XTC_TLR_OFFSET);
}
Beispiel #3
0
void timer_handler()
{
	Xuint32 ControlStatusReg;

	ControlStatusReg = XTimerCtr_ReadReg(Timer_tmrctr.BaseAddress, 0, XTC_TCSR_OFFSET);


	count++;
	onLED(count);
	XTmrCtr_WriteReg(Timer_tmrctr.BaseAddress, 0, XTC_TCSR_OFFSET, ControlStatusReg |XTC_CSR_INT_OCCURED_MASK);
}
Beispiel #4
0
/**
*
* Checks if the specified timer counter of the device has expired. In capture
* mode, expired is defined as a capture occurred. In compare mode, expired is
* defined as the timer counter rolled over/under for up/down counting.
*
* When interrupts are enabled, the expiration causes an interrupt. This function
* is typically used to poll a timer counter to determine when it has expired.
*
* @param	InstancePtr is a pointer to the XTmrCtr instance.
* @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	TRUE if the timer has expired, and FALSE otherwise.
*
* @note		None.
*
******************************************************************************/
int XTmrCtr_IsExpired(XTmrCtr * InstancePtr, u8 TmrCtrNumber)
{
	u32 CounterControlReg;

	Xil_AssertNonvoid(InstancePtr != NULL);
	Xil_AssertNonvoid(TmrCtrNumber < XTC_DEVICE_TIMER_COUNT);
	Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);

	/*
	 * Check if timer is expired
	 */
	CounterControlReg = XTimerCtr_ReadReg(InstancePtr->BaseAddress,
					       TmrCtrNumber, XTC_TCSR_OFFSET);

	return ((CounterControlReg & XTC_CSR_INT_OCCURED_MASK) ==
		XTC_CSR_INT_OCCURED_MASK);
}
Beispiel #5
0
/**
*
* Resets the specified timer counter of the device. A reset causes the timer
* counter to set it's value to the reset value.
*
* @param	InstancePtr is a pointer to the XTmrCtr instance.
* @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	None.
*
* @note		None.
*
******************************************************************************/
void XTmrCtr_Reset(XTmrCtr * InstancePtr, u8 TmrCtrNumber)
{
	u32 CounterControlReg;

	Xil_AssertVoid(InstancePtr != NULL);
	Xil_AssertVoid(TmrCtrNumber < XTC_DEVICE_TIMER_COUNT);
	Xil_AssertVoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);

	/*
	 * Read current contents of the register so it won't be destroyed
	 */
	CounterControlReg = XTimerCtr_ReadReg(InstancePtr->BaseAddress,
					       TmrCtrNumber, XTC_TCSR_OFFSET);
	/*
	 * Reset the timer by toggling the reset bit in the register
	 */
	XTmrCtr_WriteReg(InstancePtr->BaseAddress, TmrCtrNumber,
			  XTC_TCSR_OFFSET,
			  CounterControlReg | XTC_CSR_LOAD_MASK);

	XTmrCtr_WriteReg(InstancePtr->BaseAddress, TmrCtrNumber,
			  XTC_TCSR_OFFSET, CounterControlReg);
}
Beispiel #6
0
/**
*
* Stops the timer counter by disabling it.
*
* It is the callers' responsibility to disconnect the interrupt handler of the
* timer_counter from the interrupt source, typically an interrupt controller,
* and disable the interrupt within the interrupt controller.
*
* @param	InstancePtr is a pointer to the XTmrCtr instance.
* @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	None.
*
* @note		None.
*
******************************************************************************/
void XTmrCtr_Stop(XTmrCtr * InstancePtr, u8 TmrCtrNumber)
{
	u32 ControlStatusReg;

	Xil_AssertVoid(InstancePtr != NULL);
	Xil_AssertVoid(TmrCtrNumber < XTC_DEVICE_TIMER_COUNT);
	Xil_AssertVoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);

	/*
	 * Read the current register contents
	 */
	ControlStatusReg = XTimerCtr_ReadReg(InstancePtr->BaseAddress,
					      TmrCtrNumber, XTC_TCSR_OFFSET);
	/*
	 * Disable the timer counter such that it's not running
	 */
	ControlStatusReg &= ~(XTC_CSR_ENABLE_TMR_MASK);

	/*
	 * Write out the updated value to the actual register.
	 */
	XTmrCtr_WriteReg(InstancePtr->BaseAddress, TmrCtrNumber,
			  XTC_TCSR_OFFSET, ControlStatusReg);
}
	int Get_Timer()
	{
	        return XTimerCtr_ReadReg(XPAR_AXI_TIMER_0_BASEADDR,XPAR_AXI_TIMER_0_DEVICE_ID, XTC_TCR_OFFSET);
	}
	int Stop_Timer()
	{
	        XTmrCtr_Disable(XPAR_AXI_TIMER_0_BASEADDR,XPAR_AXI_TIMER_0_DEVICE_ID);
	        return XTimerCtr_ReadReg(XPAR_AXI_TIMER_0_BASEADDR,XPAR_AXI_TIMER_0_DEVICE_ID, XTC_TCR_OFFSET);
	}
Beispiel #9
0
/**
*
* Interrupt Service Routine (ISR) for the driver.  This function only performs
* processing for the device and does not save and restore the interrupt context.
*
* @param	InstancePtr contains a pointer to the timer/counter instance for
*		the interrupt.
*
* @return	None.
*
* @note		None.
*
******************************************************************************/
void XTmrCtr_InterruptHandler(void *InstancePtr)
{
	XTmrCtr *TmrCtrPtr = NULL;
	u8 TmrCtrNumber;
	u32 ControlStatusReg;

	/*
	 * Verify that each of the inputs are valid.
	 */

	Xil_AssertVoid(InstancePtr != NULL);

	/*
	 * Convert the non-typed pointer to an timer/counter instance pointer
	 * such that there is access to the timer/counter
	 */
	TmrCtrPtr = (XTmrCtr *) InstancePtr;

	/*
	 * Loop thru each timer counter in the device and call the callback
	 * function for each timer which has caused an interrupt
	 */
	for (TmrCtrNumber = 0;
	     TmrCtrNumber < XTC_DEVICE_TIMER_COUNT; TmrCtrNumber++) {
		/*
		 * Check if timer is expired
		 */
		ControlStatusReg = XTimerCtr_ReadReg(TmrCtrPtr->BaseAddress,
						      TmrCtrNumber,
						      XTC_TCSR_OFFSET);

		if (ControlStatusReg & XTC_CSR_INT_OCCURED_MASK) {
			/*
			 * Increment statistics for the number of interrupts and
			 * call the callback to handle any application specific
			 * processing
			 */
			TmrCtrPtr->Stats.Interrupts++;
			TmrCtrPtr->Handler(TmrCtrPtr->CallBackRef,
					   TmrCtrNumber);
			/*
			 * Read the new Control/Status Register content.
			 */
			ControlStatusReg = XTimerCtr_ReadReg(TmrCtrPtr->BaseAddress,
						      TmrCtrNumber,
						      XTC_TCSR_OFFSET);
			/*
			 * If in compare mode and a single shot rather than auto
			 * reload mode then disable the timer and reset it such
			 * so that the interrupt can be acknowledged, this
			 * should be only temporary till the hardware is fixed
			 */
			if (((ControlStatusReg & XTC_CSR_AUTO_RELOAD_MASK) == 0)
			    && ((ControlStatusReg & XTC_CSR_CAPTURE_MODE_MASK)
				== 0)) {
				/*
				 * Disable the timer counter and reset it such
				 * that the timer counter is loaded with the
				 * reset value allowing the interrupt to be
				 * acknowledged
				 */
				ControlStatusReg &= ~XTC_CSR_ENABLE_TMR_MASK;

				XTmrCtr_WriteReg(TmrCtrPtr->BaseAddress,
						  TmrCtrNumber, XTC_TCSR_OFFSET,
						  ControlStatusReg |
						  XTC_CSR_LOAD_MASK);

				/*
				 * Clear the reset condition, the reset bit must
				 * be manually cleared by a 2nd write to the
				 * register
				 */
				XTmrCtr_WriteReg(TmrCtrPtr->BaseAddress,
						  TmrCtrNumber, XTC_TCSR_OFFSET,
						  ControlStatusReg);
			}

			/*
			 * Acknowledge the interrupt by clearing the interrupt
			 * bit in the timer control status register, this is
			 * done after calling the handler so the application
			 * could call IsExpired, the interrupt
			 * is cleared by writing a 1 to the interrupt bit of the
			 * register without changing any of the other bits
			 */
			XTmrCtr_WriteReg(TmrCtrPtr->BaseAddress, TmrCtrNumber,
					  XTC_TCSR_OFFSET,
					  ControlStatusReg |
					  XTC_CSR_INT_OCCURED_MASK);
		}
	}
}
Beispiel #10
0
/**
*
* Initializes a specific timer/counter instance/driver. Initialize fields of
* the XTmrCtr structure, then reset the timer/counter
*
* @param	InstancePtr is a pointer to the XTmrCtr instance.
* @param	DeviceId is the unique id of the device controlled by this
*		XTmrCtr component.  Passing in a device id associates the
*		generic XTmrCtr component to a specific device, as chosen by
*		the caller or application developer.
*
* @return
*		- XST_SUCCESS if initialization was successful
*		- XST_DEVICE_IS_STARTED if the device has already been started
*		- XST_DEVICE_NOT_FOUND if the device doesn't exist
*
* @note		None.
*
******************************************************************************/
int XTmrCtr_Initialize(XTmrCtr * InstancePtr, u16 DeviceId)
{
	XTmrCtr_Config *TmrCtrConfigPtr;
	int TmrCtrNumber;
	u32 StatusReg;

	Xil_AssertNonvoid(InstancePtr != NULL);

	/*
	 * Lookup the device configuration in the temporary CROM table. Use this
	 * configuration info down below when initializing this component.
	 */
	TmrCtrConfigPtr = XTmrCtr_LookupConfig(DeviceId);

	if (TmrCtrConfigPtr == (XTmrCtr_Config *) NULL) {
		return XST_DEVICE_NOT_FOUND;
	}

	/*
	 * Check each of the timer counters of the device, if any are already
	 * running, then the device should not be initialized. This allows the
	 * user to stop the device and reinitialize, but prevents a user from
	 * inadvertently initializing.
	 */
	for (TmrCtrNumber = 0; TmrCtrNumber < XTC_DEVICE_TIMER_COUNT;
	     TmrCtrNumber++) {
		/*
		 * Read the current register contents and check if the timer
		 * counter is started and running, note that the register read
		 * is not using the base address in the instance so this is not
		 * destructive if the timer counter is already started
		 */
		StatusReg = XTimerCtr_ReadReg(TmrCtrConfigPtr->BaseAddress,
					       TmrCtrNumber, XTC_TCSR_OFFSET);
		if (StatusReg & XTC_CSR_ENABLE_TMR_MASK) {
			return XST_DEVICE_IS_STARTED;
		}
	}

	/*
	 * Set some default values, including setting the callback
	 * handlers to stubs.
	 */
	InstancePtr->BaseAddress = TmrCtrConfigPtr->BaseAddress;
	InstancePtr->Handler = NULL;
	InstancePtr->CallBackRef = NULL;

	/*
	 * Clear the statistics for this driver
	 */
	InstancePtr->Stats.Interrupts = 0;

	/* Initialize the registers of each timer/counter in the device */

	for (TmrCtrNumber = 0; TmrCtrNumber < XTC_DEVICE_TIMER_COUNT;
	     TmrCtrNumber++) {
		/*
		 * Set the Compare register to 0
		 */
		XTmrCtr_WriteReg(InstancePtr->BaseAddress, TmrCtrNumber,
				  XTC_TLR_OFFSET, 0);
		/*
		 * Reset the timer and the interrupt, the reset bit will need to
		 * be cleared after this
		 */
		XTmrCtr_WriteReg(InstancePtr->BaseAddress, TmrCtrNumber,
				  XTC_TCSR_OFFSET,
				  XTC_CSR_INT_OCCURED_MASK | XTC_CSR_LOAD_MASK);
		/*
		 * Set the control/status register to complete initialization by
		 * clearing the reset bit which was just set
		 */
		XTmrCtr_WriteReg(InstancePtr->BaseAddress, TmrCtrNumber,
				  XTC_TCSR_OFFSET, 0);
	}

	/*
	 * Indicate the instance is ready to use, successfully initialized
	 */
	InstancePtr->IsReady = XIL_COMPONENT_IS_READY;

	return XST_SUCCESS;
}