| /****************************************************************************** |
| * |
| * Copyright (C) 2002 - 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 xuartlite.c |
| * @addtogroup uartlite_v3_1 |
| * @{ |
| * |
| * Contains required functions for the XUartLite driver. See the xuartlite.h |
| * header file for more details on this driver. |
| * |
| * <pre> |
| * MODIFICATION HISTORY: |
| * |
| * Ver Who Date Changes |
| * ----- ---- -------- ----------------------------------------------- |
| * 1.00a ecm 08/31/01 First release |
| * 1.00b jhl 02/21/02 Repartitioned the driver for smaller files |
| * 1.00b rmm 05/13/03 Fixed diab compiler warnings relating to asserts |
| * 1.01a jvb 12/13/05 Changed Initialize() into CfgInitialize(), and made |
| * CfgInitialize() take a pointer to a config structure |
| * instead of a device id. Moved Initialize() into |
| * xgpio_sinit.c, and had Initialize() call CfgInitialize() |
| * after it retrieved the config structure using the device |
| * id. Removed include of xparameters.h along with any |
| * dependencies on xparameters.h and the _g.c config table. |
| * 1.01a wsy 05/08/06 fix CR220811 and CR224103. |
| * 1.12a mta 03/31/07 Updated to new coding conventions |
| * 1.13a sv 01/21/08 Updated driver to support access through DCR bus |
| * 1.14a sdm 09/26/08 Updated code to avoid race condition in |
| * XUartLite_SendBuffer |
| * 2.00a ktn 10/20/09 Updated to use HAL Processor APIs. The macros have been |
| * renamed to remove _m from the name. XUartLite_mClearStats |
| * macro is removed and XUartLite_ClearStats function should |
| * be used in its place. |
| * 2.00a hvm 08/11/11 Removed the SetOptions related information in the |
| * Recv and RecvBuffer function header notes section. |
| * CR620849. |
| * 2.01a adk 18/04/13 Updated the code to avoid unused variable |
| * warnings when compiling with the -Wextra -Wall flags |
| * In the file xuartlite.c. CR:704999. |
| * 3.1 nsk 21/07/15 Updated XUartLite_ReceiveBuffer function to update the |
| * receive data into user buffer in critical region. |
| * CR#865787. |
| * 3.2 sk 11/10/15 Used UINTPTR instead of u32 for Baseaddress CR# 867425. |
| * Changed the prototype of XUartLite_CfgInitialize API. |
| * |
| * </pre> |
| * |
| *****************************************************************************/ |
| |
| /***************************** Include Files ********************************/ |
| |
| #include "xuartlite.h" |
| #include "xuartlite_i.h" |
| #include "xil_io.h" |
| |
| /************************** Constant Definitions ****************************/ |
| |
| |
| /**************************** Type Definitions ******************************/ |
| |
| |
| /***************** Macros (Inline Functions) Definitions ********************/ |
| |
| |
| /************************** Variable Definitions ****************************/ |
| /************************** Function Prototypes *****************************/ |
| |
| static void StubHandler(void *CallBackRef, unsigned int ByteCount); |
| |
| /****************************************************************************/ |
| /** |
| * |
| * Initialize a XUartLite instance. The receive and transmit FIFOs of the |
| * UART are not flushed, so the user may want to flush them. The hardware |
| * device does not have any way to disable the receiver such that any valid |
| * data may be present in the receive FIFO. This function disables the UART |
| * interrupt. The baudrate and format of the data are fixed in the hardware |
| * at hardware build time. |
| * |
| * @param InstancePtr is a pointer to the XUartLite instance. |
| * @param Config is a reference to a structure containing information |
| * about a specific UART Lite device. This function initializes an |
| * InstancePtr object for a specific device specified by the |
| * contents of Config. This function can initialize multiple |
| * instance objects with the use of multiple calls giving different |
| * Config information on each call. |
| * @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, use |
| * Config->BaseAddress for this parameters, passing the physical |
| * address instead. |
| * |
| * @return |
| * - XST_SUCCESS if everything starts up as expected. |
| * |
| * @note The Config pointer argument is not used by this function, |
| * but is provided to keep the function signature consistent |
| * with other drivers. |
| * |
| *****************************************************************************/ |
| int XUartLite_CfgInitialize(XUartLite *InstancePtr, XUartLite_Config *Config, |
| UINTPTR EffectiveAddr) |
| { |
| (void) Config; |
| /* |
| * Assert validates the input arguments |
| */ |
| Xil_AssertNonvoid(InstancePtr != NULL); |
| |
| /* |
| * Set some default values, including setting the callback |
| * handlers to stubs. |
| */ |
| InstancePtr->SendBuffer.NextBytePtr = NULL; |
| InstancePtr->SendBuffer.RemainingBytes = 0; |
| InstancePtr->SendBuffer.RequestedBytes = 0; |
| |
| InstancePtr->ReceiveBuffer.NextBytePtr = NULL; |
| InstancePtr->ReceiveBuffer.RemainingBytes = 0; |
| InstancePtr->ReceiveBuffer.RequestedBytes = 0; |
| |
| InstancePtr->IsReady = XIL_COMPONENT_IS_READY; |
| |
| #if (XPAR_XUARTLITE_USE_DCR_BRIDGE != 0) |
| InstancePtr->RegBaseAddress = ((EffectiveAddr >> 2)) & 0xFFF; |
| #else |
| InstancePtr->RegBaseAddress = EffectiveAddr; |
| #endif |
| |
| InstancePtr->RecvHandler = StubHandler; |
| InstancePtr->SendHandler = StubHandler; |
| |
| /* Write to the control register to disable the interrupts, don't |
| * reset the FIFOs are the user may want the data that's present |
| */ |
| XUartLite_WriteReg(InstancePtr->RegBaseAddress, |
| XUL_CONTROL_REG_OFFSET, 0); |
| |
| /* |
| * Clear the statistics for this driver |
| */ |
| XUartLite_ClearStats(InstancePtr); |
| |
| return XST_SUCCESS; |
| } |
| |
| /****************************************************************************/ |
| /** |
| * |
| * This functions sends the specified buffer of data using the UART in either |
| * polled or interrupt driven modes. This function is non-blocking such that it |
| * will return before the data has been sent by the UART. If the UART is busy |
| * sending data, it will return and indicate zero bytes were sent. |
| * |
| * In a polled mode, this function will only send as much data as the UART can |
| * buffer in the FIFO. The application may need to call it repeatedly to |
| * send a buffer. |
| * |
| * In interrupt mode, this function will start sending the specified buffer and |
| * then the interrupt handler of the driver will continue sending data until the |
| * buffer has been sent. A callback function, as specified by the application, |
| * will be called to indicate the completion of sending the buffer. |
| * |
| * @param InstancePtr is a pointer to the XUartLite instance. |
| * @param DataBufferPtr 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. |
| * |
| ******************************************************************************/ |
| unsigned int XUartLite_Send(XUartLite *InstancePtr, u8 *DataBufferPtr, |
| unsigned int NumBytes) |
| { |
| unsigned int BytesSent; |
| u32 StatusRegister; |
| |
| /* |
| * Assert validates the input arguments |
| */ |
| Xil_AssertNonvoid(InstancePtr != NULL); |
| Xil_AssertNonvoid(DataBufferPtr != NULL); |
| Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY); |
| Xil_AssertNonvoid(((signed)NumBytes) >= 0); |
| |
| /* |
| * Enter a critical region by disabling the UART interrupts to allow |
| * this call to stop a previous operation that may be interrupt driven. |
| */ |
| StatusRegister = XUartLite_GetStatusReg(InstancePtr->RegBaseAddress); |
| |
| XUartLite_WriteReg(InstancePtr->RegBaseAddress, |
| XUL_CONTROL_REG_OFFSET, 0); |
| |
| /* |
| * Setup the specified buffer to be sent by setting the instance |
| * variables so it can be sent with polled or interrupt mode |
| */ |
| InstancePtr->SendBuffer.RequestedBytes = NumBytes; |
| InstancePtr->SendBuffer.RemainingBytes = NumBytes; |
| InstancePtr->SendBuffer.NextBytePtr = DataBufferPtr; |
| |
| /* |
| * Restore the interrupt enable register to it's previous value such |
| * that the critical region is exited. |
| * This is done here to minimize the amount of time the interrupt is |
| * disabled since there is only one interrupt and the receive could |
| * be filling up while interrupts are blocked. |
| */ |
| |
| StatusRegister &= XUL_CR_ENABLE_INTR; |
| XUartLite_WriteReg(InstancePtr->RegBaseAddress, |
| XUL_CONTROL_REG_OFFSET, StatusRegister); |
| |
| /* |
| * Send the buffer using the UART and return the number of bytes sent |
| */ |
| BytesSent = XUartLite_SendBuffer(InstancePtr); |
| |
| return BytesSent; |
| } |
| |
| |
| /****************************************************************************/ |
| /** |
| * |
| * This function will attempt to receive a specified number of bytes of data |
| * from the UART and store it into the specified buffer. This function is |
| * designed for either polled or interrupt driven modes. It is non-blocking |
| * such that it will return if no data has already received by the UART. |
| * |
| * In a polled mode, this function will only receive as much data as the UART |
| * can buffer in the FIFO. The application may need to call it repeatedly to |
| * receive a buffer. Polled mode is the default mode of operation for the driver. |
| * |
| * In interrupt mode, this function will start receiving and then the interrupt |
| * handler of the driver will continue receiving data until the buffer has been |
| * received. A callback function, as specified by the application, will be called |
| * to indicate the completion of receiving the buffer or when any receive errors |
| * or timeouts occur. |
| * |
| * @param InstancePtr is a pointer to the XUartLite instance. |
| * @param DataBufferPtr 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. |
| * |
| *****************************************************************************/ |
| unsigned int XUartLite_Recv(XUartLite *InstancePtr, u8 *DataBufferPtr, |
| unsigned int NumBytes) |
| { |
| unsigned int ReceivedCount; |
| u32 StatusRegister; |
| |
| /* |
| * Assert validates the input arguments |
| */ |
| Xil_AssertNonvoid(InstancePtr != NULL); |
| Xil_AssertNonvoid(DataBufferPtr != NULL); |
| Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY); |
| Xil_AssertNonvoid(((signed)NumBytes) >= 0); |
| |
| /* |
| * Enter a critical region by disabling all the UART interrupts to allow |
| * this call to stop a previous operation that may be interrupt driven |
| */ |
| StatusRegister = XUartLite_GetStatusReg(InstancePtr->RegBaseAddress); |
| XUartLite_WriteReg(InstancePtr->RegBaseAddress, |
| XUL_CONTROL_REG_OFFSET, 0); |
| |
| /* |
| * Setup the specified buffer to be received by setting the instance |
| * variables so it can be received with polled or interrupt mode |
| */ |
| InstancePtr->ReceiveBuffer.RequestedBytes = NumBytes; |
| InstancePtr->ReceiveBuffer.RemainingBytes = NumBytes; |
| InstancePtr->ReceiveBuffer.NextBytePtr = DataBufferPtr; |
| |
| /* |
| * Restore the interrupt enable register to it's previous value such |
| * that the critical region is exited |
| */ |
| StatusRegister &= XUL_CR_ENABLE_INTR; |
| XUartLite_WriteReg(InstancePtr->RegBaseAddress, |
| XUL_CONTROL_REG_OFFSET, StatusRegister); |
| |
| /* |
| * Receive the data from the UART and return the number of bytes |
| * received |
| * This is done here to minimize the amount of time the interrupt is |
| * disabled since there is only one interrupt and the transmit could |
| * be emptying out while interrupts are blocked. |
| */ |
| ReceivedCount = XUartLite_ReceiveBuffer(InstancePtr); |
| |
| return ReceivedCount; |
| |
| } |
| |
| /****************************************************************************/ |
| /** |
| * |
| * This function resets the FIFOs, both transmit and receive, of the UART such |
| * that they are emptied. Since the UART does not have any way to disable it |
| * from receiving data, it may be necessary for the application to reset the |
| * FIFOs to get rid of any unwanted data. |
| * |
| * @param InstancePtr is a pointer to the XUartLite instance . |
| * |
| * @return None. |
| * |
| * @note None. |
| * |
| *****************************************************************************/ |
| void XUartLite_ResetFifos(XUartLite *InstancePtr) |
| { |
| u32 Register; |
| |
| Xil_AssertVoid(InstancePtr != NULL); |
| Xil_AssertVoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY); |
| |
| /* |
| * Read the status register 1st such that the next write to the control |
| * register won't destroy the state of the interrupt enable bit |
| */ |
| Register = XUartLite_ReadReg(InstancePtr->RegBaseAddress, |
| XUL_STATUS_REG_OFFSET); |
| |
| /* |
| * Mask off the interrupt enable bit to maintain it's state. |
| */ |
| Register &= XUL_SR_INTR_ENABLED; |
| |
| /* |
| * Write to the control register to reset both FIFOs, these bits are |
| * self-clearing such that there's no need to clear them |
| */ |
| XUartLite_WriteReg(InstancePtr->RegBaseAddress, XUL_CONTROL_REG_OFFSET, |
| Register | XUL_CR_FIFO_TX_RESET | XUL_CR_FIFO_RX_RESET); |
| } |
| |
| /****************************************************************************/ |
| /** |
| * |
| * This function determines if the specified UART is sending data. If the |
| * transmitter register is not empty, it is sending data. |
| * |
| * @param InstancePtr is a pointer to the XUartLite instance. |
| * |
| * @return A value of TRUE if the UART is sending data, otherwise FALSE. |
| * |
| * @note None. |
| * |
| *****************************************************************************/ |
| int XUartLite_IsSending(XUartLite *InstancePtr) |
| { |
| u32 StatusRegister; |
| |
| /* |
| * Assert validates the input arguments |
| */ |
| Xil_AssertNonvoid(InstancePtr != NULL); |
| |
| /* |
| * Read the status register to determine if the transmitter is empty |
| */ |
| StatusRegister = XUartLite_ReadReg(InstancePtr->RegBaseAddress, |
| XUL_STATUS_REG_OFFSET); |
| |
| /* |
| * If the transmitter is not empty then indicate that the UART is still |
| * sending some data |
| */ |
| return ((StatusRegister & XUL_SR_TX_FIFO_EMPTY) == 0); |
| } |
| |
| |
| /**************************************************************************** |
| * |
| * This function provides a stub handler such that if the application does not |
| * define a handler but enables interrupts, this function will be called. |
| * |
| * @param CallBackRef has no purpose but is necessary to match the |
| * interface for a handler. |
| * @param ByteCount has no purpose but is necessary to match the |
| * interface for a handler. |
| * |
| * @return None. |
| * |
| * @note None. |
| * |
| *****************************************************************************/ |
| static void StubHandler(void *CallBackRef, unsigned int ByteCount) |
| { |
| (void) CallBackRef; |
| (void) ByteCount; |
| /* |
| * Assert occurs always since this is a stub and should never be called |
| */ |
| Xil_AssertVoidAlways(); |
| } |
| |
| |
| /****************************************************************************/ |
| /** |
| * |
| * This function sends a buffer that has been previously specified by setting |
| * up the instance variables of the instance. This function is designed to be |
| * an internal function for the XUartLite component 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 of data to the UART in either |
| * polled or interrupt driven modes. This function is non-blocking such that |
| * it will return before the data has been sent by the UART. |
| * |
| * In a polled mode, this function will only send as much data as the UART can |
| * buffer, either in the transmitter or in the FIFO if present and enabled. |
| * The application may need to call it repeatedly to send a buffer. |
| * |
| * In interrupt mode, this function will start sending the specified buffer and |
| * then the interrupt handler of the driver will continue until the buffer |
| * has been sent. A callback function, as specified by the application, will |
| * be called to indicate the completion of sending the buffer. |
| * |
| * @param InstancePtr is a pointer to the XUartLite instance. |
| * |
| * @return NumBytes is the number of bytes actually sent (put into the |
| * UART transmitter and/or FIFO). |
| * |
| * @note None. |
| * |
| *****************************************************************************/ |
| unsigned int XUartLite_SendBuffer(XUartLite *InstancePtr) |
| { |
| unsigned int SentCount = 0; |
| u8 StatusRegister; |
| u8 IntrEnableStatus; |
| |
| /* |
| * Read the status register to determine if the transmitter is full |
| */ |
| StatusRegister = XUartLite_GetStatusReg(InstancePtr->RegBaseAddress); |
| |
| /* |
| * Enter a critical region by disabling all the UART interrupts to allow |
| * this call to stop a previous operation that may be interrupt driven |
| */ |
| StatusRegister = XUartLite_GetStatusReg(InstancePtr->RegBaseAddress); |
| XUartLite_WriteReg(InstancePtr->RegBaseAddress, |
| XUL_CONTROL_REG_OFFSET, 0); |
| |
| /* |
| * Save the status register contents to restore the interrupt enable |
| * register to it's previous value when that the critical region is |
| * exited |
| */ |
| IntrEnableStatus = StatusRegister; |
| |
| /* |
| * Fill the FIFO from the the buffer that was specified |
| */ |
| |
| while (((StatusRegister & XUL_SR_TX_FIFO_FULL) == 0) && |
| (SentCount < InstancePtr->SendBuffer.RemainingBytes)) { |
| XUartLite_WriteReg(InstancePtr->RegBaseAddress, |
| XUL_TX_FIFO_OFFSET, |
| InstancePtr->SendBuffer.NextBytePtr[ |
| SentCount]); |
| |
| SentCount++; |
| |
| StatusRegister = |
| XUartLite_GetStatusReg(InstancePtr->RegBaseAddress); |
| |
| } |
| |
| /* |
| * Update the buffer to reflect the bytes that were sent from it |
| */ |
| InstancePtr->SendBuffer.NextBytePtr += SentCount; |
| InstancePtr->SendBuffer.RemainingBytes -= SentCount; |
| |
| /* |
| * Increment associated counters |
| */ |
| InstancePtr->Stats.CharactersTransmitted += SentCount; |
| |
| /* |
| * Restore the interrupt enable register to it's previous value such |
| * that the critical region is exited |
| */ |
| IntrEnableStatus &= XUL_CR_ENABLE_INTR; |
| XUartLite_WriteReg(InstancePtr->RegBaseAddress, XUL_CONTROL_REG_OFFSET, |
| IntrEnableStatus); |
| |
| /* |
| * Return the number of bytes that were sent, althought they really were |
| * only put into the FIFO, not completely sent yet |
| */ |
| return SentCount; |
| } |
| |
| /****************************************************************************/ |
| /** |
| * |
| * This function receives a buffer that has been previously specified by setting |
| * up the instance variables of the instance. This function is designed to be |
| * an internal function for the XUartLite component such that it may be called |
| * from a shell function that sets up the buffer or from an interrupt handler. |
| * |
| * This function will attempt to receive a specified number of bytes of data |
| * from the UART and store it into the specified buffer. This function is |
| * designed for either polled or interrupt driven modes. It is non-blocking |
| * such that it will return if there is no data has already received by the |
| * UART. |
| * |
| * In a polled mode, this function will only receive as much data as the UART |
| * can buffer, either in the receiver or in the FIFO if present and enabled. |
| * The application may need to call it repeatedly to receive a buffer. Polled |
| * mode is the default mode of operation for the driver. |
| * |
| * In interrupt mode, this function will start receiving and then the interrupt |
| * handler of the driver will continue until the buffer has been received. A |
| * callback function, as specified by the application, will be called to indicate |
| * the completion of receiving the buffer or when any receive errors or timeouts |
| * occur. |
| * |
| * @param InstancePtr is a pointer to the XUartLite instance. |
| * |
| * @return The number of bytes received. |
| * |
| * @note None. |
| * |
| *****************************************************************************/ |
| unsigned int XUartLite_ReceiveBuffer(XUartLite *InstancePtr) |
| { |
| u8 StatusRegister; |
| u8 StatusRegisterVal; |
| unsigned int ReceivedCount = 0; |
| |
| /* |
| * Enter a critical region by disabling all the UART interrupts to allow |
| * this call to stop a previous operation that may be interrupt driven |
| */ |
| StatusRegisterVal = XUartLite_GetStatusReg(InstancePtr->RegBaseAddress); |
| XUartLite_WriteReg(InstancePtr->RegBaseAddress, |
| XUL_CONTROL_REG_OFFSET, 0); |
| /* |
| * Loop until there is not more data buffered by the UART or the |
| * specified number of bytes is received |
| */ |
| |
| while (ReceivedCount < InstancePtr->ReceiveBuffer.RemainingBytes) { |
| /* |
| * Read the Status Register to determine if there is any data in |
| * the receiver/FIFO |
| */ |
| StatusRegister = |
| XUartLite_GetStatusReg(InstancePtr->RegBaseAddress); |
| |
| /* |
| * If there is data ready to be removed, then put the next byte |
| * received into the specified buffer and update the stats to |
| * reflect any receive errors for the byte |
| */ |
| if (StatusRegister & XUL_SR_RX_FIFO_VALID_DATA) { |
| InstancePtr->ReceiveBuffer.NextBytePtr[ReceivedCount++]= |
| XUartLite_ReadReg(InstancePtr->RegBaseAddress, |
| XUL_RX_FIFO_OFFSET); |
| |
| XUartLite_UpdateStats(InstancePtr, StatusRegister); |
| } |
| |
| /* |
| * There's no more data buffered, so exit such that this |
| * function does not block waiting for data |
| */ |
| else { |
| break; |
| } |
| } |
| |
| /* |
| * Update the receive buffer to reflect the number of bytes that was |
| * received |
| */ |
| InstancePtr->ReceiveBuffer.NextBytePtr += ReceivedCount; |
| InstancePtr->ReceiveBuffer.RemainingBytes -= ReceivedCount; |
| |
| /* |
| * Increment associated counters in the statistics |
| */ |
| InstancePtr->Stats.CharactersReceived += ReceivedCount; |
| |
| /* |
| * Restore the interrupt enable register to it's previous value such |
| * that the critical region is exited |
| */ |
| StatusRegisterVal &= XUL_CR_ENABLE_INTR; |
| XUartLite_WriteReg(InstancePtr->RegBaseAddress, |
| XUL_CONTROL_REG_OFFSET, StatusRegisterVal); |
| |
| return ReceivedCount; |
| } |
| |
| |
| |
| /** @} */ |