xwdtps.c

自学ZedBoard：使用IP通过ARM PS访问FPGA（源代码）

	Register = XWdtPs_ReadReg(InstancePtr->Config.BaseAddress,
				 XWDTPS_ZMR_OFFSET);

	/*
	 * Zero the field in the register.
	 */
	Register &= ~XWDTPS_ZMR_EXLN_MASK;

	/*
	 * Shift Value over to the proper positions.
	 */
	Length = Length << XWDTPS_ZMR_EXLN_SHIFT;
	Register |= Length;

	/*
	 * Set the access key so the write takes.
	 */
	Register |= XWDTPS_ZMR_ZKEY_VAL;

	/*
	 * Update the ZMR with the new value.
	 */
	XWdtPs_WriteReg(InstancePtr->Config.BaseAddress, XWDTPS_ZMR_OFFSET,
			  Register);
}

/****************************************************************************/
/**
*
* Enables the indicated signal/output.
* Performs a read/modify/write cycle to update the value correctly.
*
* @param	InstancePtr is a pointer to the XWdtPs instance.
* @param	Signal is the desired signal/output.
*		Valid Signal Values are XWDTPS_RESET_SIGNAL,
*		XWDTPS_IRQ_SIGNAL and XWDTPS_EXTERNAL_SIGNAL.
*		Only one of them can be specified at a time.
*
* @return	None.
*
* @note		None.
*
******************************************************************************/
void XWdtPs_EnableOutput(XWdtPs *InstancePtr, u8 Signal)
{
	u32 Register = 0;

	Xil_AssertVoid(InstancePtr != NULL);
	Xil_AssertVoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
	Xil_AssertVoid((Signal == XWDTPS_RESET_SIGNAL) ||
			(Signal == XWDTPS_IRQ_SIGNAL) ||
			(Signal == XWDTPS_EXTERNAL_SIGNAL));

	/*
	 * Read the contents of the ZMR register.
	 */
	Register = XWdtPs_ReadReg(InstancePtr->Config.BaseAddress,
				 XWDTPS_ZMR_OFFSET);

	if (Signal == XWDTPS_RESET_SIGNAL) {
		/*
		 * Enable the field in the register.
		 */
		Register |= XWDTPS_ZMR_RSTEN_MASK;

	} else if (Signal == XWDTPS_IRQ_SIGNAL) {
		/*
		 * Enable the field in the register.
		 */
		Register |= XWDTPS_ZMR_IRQEN_MASK;

	} else if (Signal == XWDTPS_EXTERNAL_SIGNAL) {
		/*
		 * Enable the field in the register.
		 */
		Register |= XWDTPS_ZMR_EXTEN_MASK;
	}

	/*
	 * Set the access key so the write takes.
	 */
	Register |= XWDTPS_ZMR_ZKEY_VAL;

	/*
	 * Update the ZMR with the new value.
	 */
	XWdtPs_WriteReg(InstancePtr->Config.BaseAddress, XWDTPS_ZMR_OFFSET,
			  Register);
}

/****************************************************************************/
/**
*
* Disables the indicated signal/output.
* Performs a read/modify/write cycle to update the value correctly.
*
* @param	InstancePtr is a pointer to the XWdtPs instance.
* @param	Signal is the desired signal/output.
*		Valid Signal Values are XWDTPS_RESET_SIGNAL,
*		XWDTPS_IRQ_SIGNAL AND XWDTPS_EXTERNAL_SIGNAL.
*		Only one of them can be specified at a time.
*
* @return	None.
*
* @note		None.
*
******************************************************************************/
void XWdtPs_DisableOutput(XWdtPs *InstancePtr, u8 Signal)
{
	u32 Register = 0;

	Xil_AssertVoid(InstancePtr != NULL);
	Xil_AssertVoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
	Xil_AssertVoid((Signal == XWDTPS_RESET_SIGNAL) ||
			(Signal == XWDTPS_IRQ_SIGNAL) ||
			(Signal == XWDTPS_EXTERNAL_SIGNAL));

	/*
	 * Read the contents of the ZMR register.
	 */
	Register = XWdtPs_ReadReg(InstancePtr->Config.BaseAddress,
				 XWDTPS_ZMR_OFFSET);

	if (Signal == XWDTPS_RESET_SIGNAL) {
		/*
		 * Disable the field in the register.
		 */
		Register &= ~XWDTPS_ZMR_RSTEN_MASK;

	} else if (Signal == XWDTPS_IRQ_SIGNAL) {
		/*
		 * Disable the field in the register.
		 */
		Register &= ~XWDTPS_ZMR_IRQEN_MASK;

	} else if (Signal == XWDTPS_EXTERNAL_SIGNAL) {
		/*
		 * Disable the field in the register.
		 */
		Register &= ~XWDTPS_ZMR_EXTEN_MASK;
	}

	/*
	 * Set the access key so the write takes place.
	 */
	Register |= XWDTPS_ZMR_ZKEY_VAL;

	/*
	 * Update the ZMR with the new value.
	 */
	XWdtPs_WriteReg(InstancePtr->Config.BaseAddress, XWDTPS_ZMR_OFFSET,
			  Register);
}

/****************************************************************************/
/**
*
* Returns the current control setting for the indicated signal/output.
* The register referenced is the Counter Control Register (XWDTPS_CCR_OFFSET)
*
* @param	InstancePtr is a pointer to the XWdtPs instance.
* @param	Control is the desired signal/output.
*		Valid Control Values are XWDTPS_CLK_PRESCALE and
*		XWDTPS_COUNTER_RESET. Only one of them can be specified at a
*		time.
*
* @return	The contents of the requested control field in the Counter
*		Control Register (XWDTPS_CCR_OFFSET).
*		If the Control is XWDTPS_CLK_PRESCALE then use the
*		defintions XWDTEPB_CCR_PSCALE_XXXX.
*		If the Control is XWDTPS_COUNTER_RESET then the values are
*		0x0 to 0xF. This is the most significant nibble of the CCR
*		register.
*
* @note		None.
*
******************************************************************************/
u32 XWdtPs_GetControlValue(XWdtPs *InstancePtr, u8 Control)
{
	u32 Register;
	u32 ReturnValue = 0;

	Xil_AssertNonvoid(InstancePtr != NULL);
	Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
	Xil_AssertNonvoid((Control == XWDTPS_CLK_PRESCALE) ||
			(Control == XWDTPS_COUNTER_RESET));

	/*
	 * Read the contents of the CCR register.
	 */
	Register = XWdtPs_ReadReg(InstancePtr->Config.BaseAddress,
			 XWDTPS_CCR_OFFSET);

	if (Control == XWDTPS_CLK_PRESCALE) {
		/*
		 * Mask off the field in the register.
		 */
		ReturnValue = Register & XWDTPS_CCR_CLKSEL_MASK;

	} else if (Control == XWDTPS_COUNTER_RESET) {
		/*
		 * Mask off the field in the register.
		 */
		Register &= XWDTPS_CCR_CRV_MASK;

		/*
		 * Shift over to the right most positions.
		 */
		ReturnValue = Register >> XWDTPS_CCR_CRV_SHIFT;
	}

	return ReturnValue;
}

/****************************************************************************/
/**
*
* Updates the current control setting for the indicated signal/output with
* the provided value.
*
* Performs a read/modify/write cycle to update the value correctly.
* The register referenced is the Counter Control Register (XWDTPS_CCR_OFFSET)
*
* @param	InstancePtr is a pointer to the XWdtPs instance.
* @param	Control is the desired signal/output.
*		Valid Control Values are XWDTPS_CLK_PRESCALE and
*		XWDTPS_COUNTER_RESET. Only one of them can be specified at a
*		time.
* @param	Value is the desired control value.
*		If the Control is XWDTPS_CLK_PRESCALE then use the
*		defintions XWDTEPB_CCR_PSCALE_XXXX.
*		If the Control is XWDTPS_COUNTER_RESET then the valid values
*		are 0x0 to 0xF, this sets the most significant nibble of the CCR
*		register.
*
* @return	None.
*
* @note		None.
*
******************************************************************************/
void XWdtPs_SetControlValue(XWdtPs *InstancePtr, u8 Control, u32 Value)
{
	u32 Register = 0;

	Xil_AssertVoid(InstancePtr != NULL);
	Xil_AssertVoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
	Xil_AssertVoid((Control == XWDTPS_CLK_PRESCALE) ||
			(Control == XWDTPS_COUNTER_RESET));

	/*
	 * Read the contents of the CCR register.
	 */
	Register = XWdtPs_ReadReg(InstancePtr->Config.BaseAddress,
				 XWDTPS_CCR_OFFSET);

	if (Control == XWDTPS_CLK_PRESCALE) {
		/*
		 * Zero the field in the register.
		 */
		Register &= ~XWDTPS_CCR_CLKSEL_MASK;

	} else if (Control == XWDTPS_COUNTER_RESET) {
		/*
		 * Zero the field in the register.
		 */
		Register &= ~XWDTPS_CCR_CRV_MASK;

		/*
		 * Shift Value over to the proper positions.
		 */
		Value = Value << XWDTPS_CCR_CRV_SHIFT;
	}

	Register |= Value;

	/*
	 * Set the access key so the write takes.
	 */
	Register |= XWDTPS_CCR_CKEY_VAL;

	/*
	 * Update the CCR with the new value.
	 */
	XWdtPs_WriteReg(InstancePtr->Config.BaseAddress, XWDTPS_CCR_OFFSET,
			  Register);
}