--- /dev/null
+/******************************************************************************
+*
+* Copyright (C) 2010 - 2015 Xilinx, Inc. All rights reserved.
+*
+* Permission is hereby granted, free of charge, to any person obtaining a copy
+* of this software and associated documentation files (the "Software"), to deal
+* in the Software without restriction, including without limitation the rights
+* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+* copies of the Software, and to permit persons to whom the Software is
+* furnished to do so, subject to the following conditions:
+*
+* The above copyright notice and this permission notice shall be included in
+* all copies or substantial portions of the Software.
+*
+* Use of the Software is limited solely to applications:
+* (a) running on a Xilinx device, or
+* (b) that interact with a Xilinx device through a bus or interconnect.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+* XILINX BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
+* OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+* SOFTWARE.
+*
+* Except as contained in this notice, the name of the Xilinx shall not be used
+* in advertising or otherwise to promote the sale, use or other dealings in
+* this Software without prior written authorization from Xilinx.
+*
+******************************************************************************/
+/****************************************************************************/
+/**
+*
+* @file xuartps.c
+* @addtogroup uartps_v3_5
+* @{
+*
+* This file contains the implementation of the interface functions for XUartPs
+* driver. Refer to the header file xuartps.h for more detailed information.
+*
+* <pre>
+* MODIFICATION HISTORY:
+*
+* Ver Who Date Changes
+* ----- ------ -------- ----------------------------------------------
+* 1.00 drg/jz 01/13/10 First Release
+* 2.2 hk 06/23/14 SW reset of RX and TX should be done when changing
+* baud rate. CR# 804281.
+* 3.00 kvn 02/13/15 Modified code for MISRA-C:2012 compliance.
+* 3.1 kvn 04/10/15 Modified code for latest RTL changes.
+* 3.5 NK 09/26/17 Fix the RX Buffer Overflow issue.
+* </pre>
+*
+*****************************************************************************/
+
+/***************************** Include Files ********************************/
+
+#include "xstatus.h"
+#include "xuartps.h"
+#include "xil_io.h"
+
+/************************** Constant Definitions ****************************/
+
+/* The following constant defines the amount of error that is allowed for
+ * a specified baud rate. This error is the difference between the actual
+ * baud rate that will be generated using the specified clock and the
+ * desired baud rate.
+ */
+#define XUARTPS_MAX_BAUD_ERROR_RATE 3U /* max % error allowed */
+
+/**************************** Type Definitions ******************************/
+
+
+/***************** Macros (Inline Functions) Definitions ********************/
+
+
+/************************** Function Prototypes *****************************/
+
+static void XUartPs_StubHandler(void *CallBackRef, u32 Event,
+ u32 ByteCount);
+
+u32 XUartPs_SendBuffer(XUartPs *InstancePtr);
+
+u32 XUartPs_ReceiveBuffer(XUartPs *InstancePtr);
+
+/************************** Variable Definitions ****************************/
+
+/****************************************************************************/
+/**
+*
+* Initializes a specific XUartPs instance such that it is ready to be used.
+* The data format of the device is setup for 8 data bits, 1 stop bit, and no
+* parity by default. The baud rate is set to a default value specified by
+* Config->DefaultBaudRate if set, otherwise it is set to 19.2K baud. The
+* receive FIFO threshold is set for 8 bytes. The default operating mode of the
+* driver is polled mode.
+*
+* @param InstancePtr is a pointer to the XUartPs instance.
+* @param Config is a reference to a structure containing information
+* about a specific XUartPs driver.
+* @param EffectiveAddr is the device base address in the virtual memory
+* address space. The caller is responsible for keeping the address
+* mapping from EffectiveAddr to the device physical base address
+* unchanged once this function is invoked. Unexpected errors may
+* occur if the address mapping changes after this function is
+* called. If address translation is not used, pass in the physical
+* address instead.
+*
+* @return
+*
+* - XST_SUCCESS if initialization was successful
+* - XST_UART_BAUD_ERROR if the baud rate is not possible because
+* the inputclock frequency is not divisible with an acceptable
+* amount of error
+*
+* @note
+*
+* The default configuration for the UART after initialization is:
+*
+* - 19,200 bps or XPAR_DFT_BAUDRATE if defined
+* - 8 data bits
+* - 1 stop bit
+* - no parity
+* - FIFO's are enabled with a receive threshold of 8 bytes
+* - The RX timeout is enabled with a timeout of 1 (4 char times)
+*
+* All interrupts are disabled.
+*
+*****************************************************************************/
+s32 XUartPs_CfgInitialize(XUartPs *InstancePtr,
+ XUartPs_Config * Config, u32 EffectiveAddr)
+{
+ s32 Status;
+ u32 ModeRegister;
+ u32 BaudRate;
+
+ /* Assert validates the input arguments */
+ Xil_AssertNonvoid(InstancePtr != NULL);
+ Xil_AssertNonvoid(Config != NULL);
+
+ /* Setup the driver instance using passed in parameters */
+ InstancePtr->Config.BaseAddress = EffectiveAddr;
+ InstancePtr->Config.InputClockHz = Config->InputClockHz;
+ InstancePtr->Config.ModemPinsConnected = Config->ModemPinsConnected;
+
+ /* Initialize other instance data to default values */
+ InstancePtr->Handler = XUartPs_StubHandler;
+
+ InstancePtr->SendBuffer.NextBytePtr = NULL;
+ InstancePtr->SendBuffer.RemainingBytes = 0U;
+ InstancePtr->SendBuffer.RequestedBytes = 0U;
+
+ InstancePtr->ReceiveBuffer.NextBytePtr = NULL;
+ InstancePtr->ReceiveBuffer.RemainingBytes = 0U;
+ InstancePtr->ReceiveBuffer.RequestedBytes = 0U;
+
+ /* Initialize the platform data */
+ InstancePtr->Platform = XGetPlatform_Info();
+
+ InstancePtr->is_rxbs_error = 0U;
+
+ /* Flag that the driver instance is ready to use */
+ InstancePtr->IsReady = XIL_COMPONENT_IS_READY;
+
+ /*
+ * Set the default baud rate here, can be changed prior to
+ * starting the device
+ */
+ BaudRate = (u32)XUARTPS_DFT_BAUDRATE;
+ Status = XUartPs_SetBaudRate(InstancePtr, BaudRate);
+ if (Status != (s32)XST_SUCCESS) {
+ InstancePtr->IsReady = 0U;
+ } else {
+
+ /*
+ * Set up the default data format: 8 bit data, 1 stop bit, no
+ * parity
+ */
+ ModeRegister = XUartPs_ReadReg(InstancePtr->Config.BaseAddress,
+ XUARTPS_MR_OFFSET);
+
+ /* Mask off what's already there */
+ ModeRegister &= (~((u32)XUARTPS_MR_CHARLEN_MASK |
+ (u32)XUARTPS_MR_STOPMODE_MASK |
+ (u32)XUARTPS_MR_PARITY_MASK));
+
+ /* Set the register value to the desired data format */
+ ModeRegister |= ((u32)XUARTPS_MR_CHARLEN_8_BIT |
+ (u32)XUARTPS_MR_STOPMODE_1_BIT |
+ (u32)XUARTPS_MR_PARITY_NONE);
+
+ /* Write the mode register out */
+ XUartPs_WriteReg(InstancePtr->Config.BaseAddress, XUARTPS_MR_OFFSET,
+ ModeRegister);
+
+ /* Set the RX FIFO trigger at 8 data bytes. */
+ XUartPs_WriteReg(InstancePtr->Config.BaseAddress,
+ XUARTPS_RXWM_OFFSET, 0x08U);
+
+ /* Set the RX timeout to 1, which will be 4 character time */
+ XUartPs_WriteReg(InstancePtr->Config.BaseAddress,
+ XUARTPS_RXTOUT_OFFSET, 0x01U);
+
+ /* Disable all interrupts, polled mode is the default */
+ XUartPs_WriteReg(InstancePtr->Config.BaseAddress, XUARTPS_IDR_OFFSET,
+ XUARTPS_IXR_MASK);
+
+ Status = XST_SUCCESS;
+ }
+ return Status;
+}
+
+/****************************************************************************/
+/**
+*
+* This functions sends the specified buffer using the device in either
+* polled or interrupt driven mode. This function is non-blocking, if the device
+* is busy sending data, it will return and indicate zero bytes were sent.
+* Otherwise, it fills the TX FIFO as much as it can, and return the number of
+* bytes sent.
+*
+* In a polled mode, this function will only send as much data as TX FIFO can
+* buffer. The application may need to call it repeatedly to send the entire
+* buffer.
+*
+* In interrupt mode, this function will start sending the specified buffer,
+* then the interrupt handler will continue sending data until the entire
+* buffer has been sent. A callback function, as specified by the application,
+* will be called to indicate the completion of sending.
+*
+* @param InstancePtr is a pointer to the XUartPs instance.
+* @param BufferPtr is pointer to a buffer of data to be sent.
+* @param NumBytes contains the number of bytes to be sent. A value of
+* zero will stop a previous send operation that is in progress
+* in interrupt mode. Any data that was already put into the
+* transmit FIFO will be sent.
+*
+* @return The number of bytes actually sent.
+*
+* @note
+*
+* The number of bytes is not asserted so that this function may be called with
+* a value of zero to stop an operation that is already in progress.
+* <br><br>
+*
+*****************************************************************************/
+u32 XUartPs_Send(XUartPs *InstancePtr, u8 *BufferPtr,
+ u32 NumBytes)
+{
+ u32 BytesSent;
+
+ /* Asserts validate the input arguments */
+ Xil_AssertNonvoid(InstancePtr != NULL);
+ Xil_AssertNonvoid(BufferPtr != NULL);
+ Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
+
+ /*
+ * Disable the UART transmit interrupts to allow this call to stop a
+ * previous operation that may be interrupt driven.
+ */
+ XUartPs_WriteReg(InstancePtr->Config.BaseAddress, XUARTPS_IDR_OFFSET,
+ (XUARTPS_IXR_TXEMPTY | XUARTPS_IXR_TXFULL));
+
+ /* Setup the buffer parameters */
+ InstancePtr->SendBuffer.RequestedBytes = NumBytes;
+ InstancePtr->SendBuffer.RemainingBytes = NumBytes;
+ InstancePtr->SendBuffer.NextBytePtr = BufferPtr;
+
+ /*
+ * Transmit interrupts will be enabled in XUartPs_SendBuffer(), after
+ * filling the TX FIFO.
+ */
+ BytesSent = XUartPs_SendBuffer(InstancePtr);
+
+ return BytesSent;
+}
+
+/****************************************************************************/
+/**
+*
+* This function attempts to receive a specified number of bytes of data
+* from the device and store it into the specified buffer. This function works
+* for both polled or interrupt driven modes. It is non-blocking.
+*
+* In a polled mode, this function will only receive the data already in the
+* RX FIFO. The application may need to call it repeatedly to receive the
+* entire buffer. Polled mode is the default mode of operation for the device.
+*
+* In interrupt mode, this function will start the receiving, if not the entire
+* buffer has been received, the interrupt handler will continue receiving data
+* until the entire buffer has been received. A callback function, as specified
+* by the application, will be called to indicate the completion of the
+* receiving or error conditions.
+*
+* @param InstancePtr is a pointer to the XUartPs instance
+* @param BufferPtr is pointer to buffer for data to be received into
+* @param NumBytes is the number of bytes to be received. A value of zero
+* will stop a previous receive operation that is in progress in
+* interrupt mode.
+*
+* @return The number of bytes received.
+*
+* @note
+*
+* The number of bytes is not asserted so that this function may be called
+* with a value of zero to stop an operation that is already in progress.
+*
+*****************************************************************************/
+u32 XUartPs_Recv(XUartPs *InstancePtr,
+ u8 *BufferPtr, u32 NumBytes)
+{
+ u32 ReceivedCount;
+ u32 ImrRegister;
+
+ /* Assert validates the input arguments */
+ Xil_AssertNonvoid(InstancePtr != NULL);
+ Xil_AssertNonvoid(BufferPtr != NULL);
+ Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
+
+ /*
+ * Disable all the interrupts.
+ * This stops a previous operation that may be interrupt driven
+ */
+ ImrRegister = XUartPs_ReadReg(InstancePtr->Config.BaseAddress,
+ XUARTPS_IMR_OFFSET);
+ XUartPs_WriteReg(InstancePtr->Config.BaseAddress, XUARTPS_IDR_OFFSET,
+ XUARTPS_IXR_MASK);
+
+ /* Setup the buffer parameters */
+ InstancePtr->ReceiveBuffer.RequestedBytes = NumBytes;
+ InstancePtr->ReceiveBuffer.RemainingBytes = NumBytes;
+ InstancePtr->ReceiveBuffer.NextBytePtr = BufferPtr;
+
+ /* Receive the data from the device */
+ ReceivedCount = XUartPs_ReceiveBuffer(InstancePtr);
+
+ /* Restore the interrupt state */
+ XUartPs_WriteReg(InstancePtr->Config.BaseAddress, XUARTPS_IER_OFFSET,
+ ImrRegister);
+
+ return ReceivedCount;
+}
+
+/****************************************************************************/
+/*
+*
+* This function sends a buffer that has been previously specified by setting
+* up the instance variables of the instance. This function is an internal
+* function for the XUartPs driver such that it may be called from a shell
+* function that sets up the buffer or from an interrupt handler.
+*
+* This function sends the specified buffer in either polled or interrupt
+* driven modes. This function is non-blocking.
+*
+* In a polled mode, this function only sends as much data as the TX FIFO
+* can buffer. The application may need to call it repeatedly to send the
+* entire buffer.
+*
+* In interrupt mode, this function starts the sending of the buffer, if not
+* the entire buffer has been sent, then the interrupt handler continues the
+* sending until the entire buffer has been sent. A callback function, as
+* specified by the application, will be called to indicate the completion of
+* sending.
+*
+* @param InstancePtr is a pointer to the XUartPs instance
+*
+* @return The number of bytes actually sent
+*
+* @note None.
+*
+*****************************************************************************/
+u32 XUartPs_SendBuffer(XUartPs *InstancePtr)
+{
+ u32 SentCount = 0U;
+ u32 ImrRegister;
+
+ /*
+ * If the TX FIFO is full, send nothing.
+ * Otherwise put bytes into the TX FIFO unil it is full, or all of the
+ * data has been put into the FIFO.
+ */
+ while ((!XUartPs_IsTransmitFull(InstancePtr->Config.BaseAddress)) &&
+ (InstancePtr->SendBuffer.RemainingBytes > SentCount)) {
+
+ /* Fill the FIFO from the buffer */
+ XUartPs_WriteReg(InstancePtr->Config.BaseAddress,
+ XUARTPS_FIFO_OFFSET,
+ ((u32)InstancePtr->SendBuffer.
+ NextBytePtr[SentCount]));
+
+ /* Increment the send count. */
+ SentCount++;
+ }
+
+ /* Update the buffer to reflect the bytes that were sent from it */
+ InstancePtr->SendBuffer.NextBytePtr += SentCount;
+ InstancePtr->SendBuffer.RemainingBytes -= SentCount;
+
+ /*
+ * If interrupts are enabled as indicated by the receive interrupt, then
+ * enable the TX FIFO empty interrupt, so further action can be taken
+ * for this sending.
+ */
+ ImrRegister =
+ XUartPs_ReadReg(InstancePtr->Config.BaseAddress,
+ XUARTPS_IMR_OFFSET);
+ if (((ImrRegister & XUARTPS_IXR_RXFULL) != (u32)0) ||
+ ((ImrRegister & XUARTPS_IXR_RXEMPTY) != (u32)0)||
+ ((ImrRegister & XUARTPS_IXR_RXOVR) != (u32)0)) {
+
+ XUartPs_WriteReg(InstancePtr->Config.BaseAddress,
+ XUARTPS_IER_OFFSET,
+ ImrRegister | (u32)XUARTPS_IXR_TXEMPTY);
+ }
+
+ return SentCount;
+}
+
+/****************************************************************************/
+/*
+*
+* This function receives a buffer that has been previously specified by setting
+* up the instance variables of the instance. This function is an internal
+* function, and it may be called from a shell function that sets up the buffer
+* or from an interrupt handler.
+*
+* This function attempts to receive a specified number of bytes from the
+* device and store it into the specified buffer. This function works for
+* either polled or interrupt driven modes. It is non-blocking.
+*
+* In polled mode, this function only receives as much data as in the RX FIFO.
+* The application may need to call it repeatedly to receive the entire buffer.
+* Polled mode is the default mode for the driver.
+*
+* In interrupt mode, this function starts the receiving, if not the entire
+* buffer has been received, the interrupt handler will continue until the
+* entire buffer has been received. A callback function, as specified by the
+* application, will be called to indicate the completion of the receiving or
+* error conditions.
+*
+* @param InstancePtr is a pointer to the XUartPs instance
+*
+* @return The number of bytes received.
+*
+* @note None.
+*
+*****************************************************************************/
+u32 XUartPs_ReceiveBuffer(XUartPs *InstancePtr)
+{
+ u32 CsrRegister;
+ u32 ReceivedCount = 0U;
+ u32 ByteStatusValue, EventData;
+ u32 Event;
+
+ /*
+ * Read the Channel Status Register to determine if there is any data in
+ * the RX FIFO
+ */
+ CsrRegister = XUartPs_ReadReg(InstancePtr->Config.BaseAddress,
+ XUARTPS_SR_OFFSET);
+
+ /*
+ * Loop until there is no more data in RX FIFO or the specified
+ * number of bytes has been received
+ */
+ while((ReceivedCount < InstancePtr->ReceiveBuffer.RemainingBytes)&&
+ (((CsrRegister & XUARTPS_SR_RXEMPTY) == (u32)0))){
+
+ if (InstancePtr->is_rxbs_error) {
+ ByteStatusValue = XUartPs_ReadReg(
+ InstancePtr->Config.BaseAddress,
+ XUARTPS_RXBS_OFFSET);
+ if((ByteStatusValue & XUARTPS_RXBS_MASK)!= (u32)0) {
+ EventData = ByteStatusValue;
+ Event = XUARTPS_EVENT_PARE_FRAME_BRKE;
+ /*
+ * Call the application handler to indicate that there is a receive
+ * error or a break interrupt, if the application cares about the
+ * error it call a function to get the last errors.
+ */
+ InstancePtr->Handler(InstancePtr->CallBackRef,
+ Event, EventData);
+ }
+ }
+
+ InstancePtr->ReceiveBuffer.NextBytePtr[ReceivedCount] =
+ XUartPs_ReadReg(InstancePtr->Config.
+ BaseAddress,
+ XUARTPS_FIFO_OFFSET);
+
+ ReceivedCount++;
+
+ CsrRegister = XUartPs_ReadReg(InstancePtr->Config.BaseAddress,
+ XUARTPS_SR_OFFSET);
+ }
+ InstancePtr->is_rxbs_error = 0;
+ /*
+ * Update the receive buffer to reflect the number of bytes just
+ * received
+ */
+ if(InstancePtr->ReceiveBuffer.NextBytePtr != NULL){
+ InstancePtr->ReceiveBuffer.NextBytePtr += ReceivedCount;
+ }
+ InstancePtr->ReceiveBuffer.RemainingBytes -= ReceivedCount;
+
+ return ReceivedCount;
+}
+
+/*****************************************************************************/
+/**
+*
+* Sets the baud rate for the device. Checks the input value for
+* validity and also verifies that the requested rate can be configured to
+* within the maximum error range specified by XUARTPS_MAX_BAUD_ERROR_RATE.
+* If the provided rate is not possible, the current setting is unchanged.
+*
+* @param InstancePtr is a pointer to the XUartPs instance
+* @param BaudRate to be set
+*
+* @return
+* - XST_SUCCESS if everything configured as expected
+* - XST_UART_BAUD_ERROR if the requested rate is not available
+* because there was too much error
+*
+* @note None.
+*
+*****************************************************************************/
+s32 XUartPs_SetBaudRate(XUartPs *InstancePtr, u32 BaudRate)
+{
+ u32 IterBAUDDIV; /* Iterator for available baud divisor values */
+ u32 BRGR_Value; /* Calculated value for baud rate generator */
+ u32 CalcBaudRate; /* Calculated baud rate */
+ u32 BaudError; /* Diff between calculated and requested baud rate */
+ u32 Best_BRGR = 0U; /* Best value for baud rate generator */
+ u8 Best_BAUDDIV = 0U; /* Best value for baud divisor */
+ u32 Best_Error = 0xFFFFFFFFU;
+ u32 PercentError;
+ u32 ModeReg;
+ u32 InputClk;
+
+ /* Asserts validate the input arguments */
+ Xil_AssertNonvoid(InstancePtr != NULL);
+ Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
+ Xil_AssertNonvoid(BaudRate <= (u32)XUARTPS_MAX_RATE);
+ Xil_AssertNonvoid(BaudRate >= (u32)XUARTPS_MIN_RATE);
+
+ /*
+ * Make sure the baud rate is not impossilby large.
+ * Fastest possible baud rate is Input Clock / 2.
+ */
+ if ((BaudRate * 2) > InstancePtr->Config.InputClockHz) {
+ return XST_UART_BAUD_ERROR;
+ }
+ /* Check whether the input clock is divided by 8 */
+ ModeReg = XUartPs_ReadReg( InstancePtr->Config.BaseAddress,
+ XUARTPS_MR_OFFSET);
+
+ InputClk = InstancePtr->Config.InputClockHz;
+ if(ModeReg & XUARTPS_MR_CLKSEL) {
+ InputClk = InstancePtr->Config.InputClockHz / 8;
+ }
+
+ /*
+ * Determine the Baud divider. It can be 4to 254.
+ * Loop through all possible combinations
+ */
+ for (IterBAUDDIV = 4; IterBAUDDIV < 255; IterBAUDDIV++) {
+
+ /* Calculate the value for BRGR register */
+ BRGR_Value = InputClk / (BaudRate * (IterBAUDDIV + 1));
+
+ /* Calculate the baud rate from the BRGR value */
+ CalcBaudRate = InputClk/ (BRGR_Value * (IterBAUDDIV + 1));
+
+ /* Avoid unsigned integer underflow */
+ if (BaudRate > CalcBaudRate) {
+ BaudError = BaudRate - CalcBaudRate;
+ }
+ else {
+ BaudError = CalcBaudRate - BaudRate;
+ }
+
+ /* Find the calculated baud rate closest to requested baud rate. */
+ if (Best_Error > BaudError) {
+
+ Best_BRGR = BRGR_Value;
+ Best_BAUDDIV = IterBAUDDIV;
+ Best_Error = BaudError;
+ }
+ }
+
+ /* Make sure the best error is not too large. */
+ PercentError = (Best_Error * 100) / BaudRate;
+ if (XUARTPS_MAX_BAUD_ERROR_RATE < PercentError) {
+ return XST_UART_BAUD_ERROR;
+ }
+
+ /* Disable TX and RX to avoid glitches when setting the baud rate. */
+ XUartPs_DisableUart(InstancePtr);
+
+ XUartPs_WriteReg(InstancePtr->Config.BaseAddress,
+ XUARTPS_BAUDGEN_OFFSET, Best_BRGR);
+ XUartPs_WriteReg(InstancePtr->Config.BaseAddress,
+ XUARTPS_BAUDDIV_OFFSET, Best_BAUDDIV);
+
+ /* RX and TX SW reset */
+ XUartPs_WriteReg(InstancePtr->Config.BaseAddress, XUARTPS_CR_OFFSET,
+ XUARTPS_CR_TXRST | XUARTPS_CR_RXRST);
+
+ /* Enable device */
+ XUartPs_EnableUart(InstancePtr);
+
+ InstancePtr->BaudRate = BaudRate;
+
+ return XST_SUCCESS;
+
+}
+
+/****************************************************************************/
+/**
+*
+* This function is a stub handler that is the default handler such that if the
+* application has not set the handler when interrupts are enabled, this
+* function will be called.
+*
+* @param CallBackRef is unused by this function.
+* @param Event is unused by this function.
+* @param ByteCount is unused by this function.
+*
+* @return None.
+*
+* @note None.
+*
+*****************************************************************************/
+static void XUartPs_StubHandler(void *CallBackRef, u32 Event,
+ u32 ByteCount)
+{
+ (void) CallBackRef;
+ (void) Event;
+ (void) ByteCount;
+ /* Assert occurs always since this is a stub and should never be called */
+ Xil_AssertVoidAlways();
+}
+/** @} */
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