/* $Id: xuartlite.h,v 1.10 2002/07/24 22:35:28 robertm Exp $ *//*******************************************************************************       XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS"*       AS A COURTESY TO YOU, SOLELY FOR USE IN DEVELOPING PROGRAMS AND*       SOLUTIONS FOR XILINX DEVICES.  BY PROVIDING THIS DESIGN, CODE,*       OR INFORMATION AS ONE POSSIBLE IMPLEMENTATION OF THIS FEATURE,*       APPLICATION OR STANDARD, XILINX IS MAKING NO REPRESENTATION*       THAT THIS IMPLEMENTATION IS FREE FROM ANY CLAIMS OF INFRINGEMENT,*       AND YOU ARE RESPONSIBLE FOR OBTAINING ANY RIGHTS YOU MAY REQUIRE*       FOR YOUR IMPLEMENTATION.  XILINX EXPRESSLY DISCLAIMS ANY*       WARRANTY WHATSOEVER WITH RESPECT TO THE ADEQUACY OF THE*       IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OR*       REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE FROM CLAIMS OF*       INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS*       FOR A PARTICULAR PURPOSE.**       (c) Copyright 2002 Xilinx Inc.*       All rights reserved.******************************************************************************//****************************************************************************//**** @file xuartlite.h** This component contains the implementation of the XUartLite component which is* the driver for the Xilinx UART Lite device. This UART is a minimal hardware* implementation with minimal features.  Most of the features, including baud* rate, parity, and number of data bits are only configurable when the hardware* device is built, rather than at run time by software.** The device has 16 byte transmit and receive FIFOs and supports interrupts.* The device does not have any way to disable the receiver such that the* receive FIFO may contain unwanted data.  The FIFOs are not flushed when the* driver is initialized, but a function is provided to allow the user to* reset the FIFOs if desired.** The driver defaults to no interrupts at initialization such that interrupts* must be enabled if desired. An interrupt is generated when the transmit FIFO* transitions from having data to being empty or when any data is contained in* the receive FIFO.** In order to use interrupts, it's necessary for the user to connect the driver* interrupt handler, XUartLite_InterruptHandler, to the interrupt system of the* application.  This function does not save and restore the processor context* such that the user must provide it.  Send and receive handlers may be set for* the driver such that the handlers are called when transmit and receive* interrupts occur.  The handlers are called from interrupt context and are* designed to allow application specific processing to be performed.** The functions, XUartLite_Send and XUartLite_Recv, are provided in the driver* to allow data to be sent and received. They are designed to be used in* polled or interrupt modes.** The driver provides a status for each received byte indicating any parity* frame or overrun error. The driver provides statistics which allow visibility* into these errors.** <b>RTOS Independence</b>** This driver is intended to be RTOS and processor independent.  It works* with physical addresses only.  Any needs for dynamic memory management,* threads or thread mutual exclusion, virtual memory, or cache control must* be satisfied by the layer above this driver.** @note** The driver is partitioned such that a minimal implementation may be used.* More features require additional files to be linked in.** <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* </pre>******************************************************************************/#ifndef XUARTLITE_H /* prevent circular inclusions */#define XUARTLITE_H /* by using protection macros *//***************************** Include Files ********************************/#include "xbasic_types.h"#include "xstatus.h"/************************** Constant Definitions ****************************//**************************** Type Definitions ******************************//** * Callback function.  The first argument is a callback reference passed in by * the upper layer when setting the callback functions, and passed back to the * upper layer when the callback is invoked. * The second argument is the ByteCount which is the number of bytes that * actually moved from/to the buffer provided in the _Send/_Receive call. */typedef void (*XUartLite_Handler)(void *CallBackRef, unsigned int ByteCount);/** * Statistics for the XUartLite driver */typedef struct{    Xuint32 TransmitInterrupts;     /**< Number of transmit interrupts */    Xuint32 ReceiveInterrupts;      /**< Number of receive interrupts */    Xuint32 CharactersTransmitted;  /**< Number of characters transmitted */    Xuint32 CharactersReceived;     /**< Number of characters received */    Xuint32 ReceiveOverrunErrors;   /**< Number of receive overruns */    Xuint32 ReceiveParityErrors;    /**< Number of receive parity errors */    Xuint32 ReceiveFramingErrors;   /**< Number of receive framing errors */} XUartLite_Stats;/** * The following data type is used to manage the buffers that are handled * when sending and receiving data in the interrupt mode. It is intended * for internal use only. */typedef struct{    Xuint8 *NextBytePtr;    unsigned int RequestedBytes;    unsigned int RemainingBytes;} XUartLite_Buffer;/** * This typedef contains configuration information for the device. */typedef struct{    Xuint16 DeviceId;       /**< Unique ID  of device */    Xuint32 RegBaseAddr;    /**< Register base address */    Xuint32 BaudRate;       /**< Fixed baud rate */    Xuint8  UseParity;      /**< Parity generator enabled when XTRUE */    Xuint8  ParityOdd;      /**< Parity generated is odd when XTRUE, even when                                 XFALSE */    Xuint8  DataBits;       /**< Fixed data bits */} XUartLite_Config;/** * The XUartLite driver instance data. The user is required to allocate a * variable of this type for every UART Lite device in the system. A pointer * to a variable of this type is then passed to the driver API functions. */typedef struct{    XUartLite_Stats Stats;      /* Component Statistics */    Xuint32 RegBaseAddress;     /* Base address of registers */    Xuint32 IsReady;            /* Device is initialized and ready */    XUartLite_Buffer SendBuffer;    XUartLite_Buffer ReceiveBuffer;    XUartLite_Handler RecvHandler;    void *RecvCallBackRef;          /* Callback reference for recv handler */    XUartLite_Handler SendHandler;    void *SendCallBackRef;          /* Callback reference for send handler */} XUartLite;/***************** Macros (Inline Functions) Definitions ********************//************************** Function Prototypes *****************************//* * Required functions, in file xuart.c */XStatus XUartLite_Initialize(XUartLite *InstancePtr, Xuint16 DeviceId);void XUartLite_ResetFifos(XUartLite *InstancePtr);unsigned int XUartLite_Send(XUartLite *InstancePtr, Xuint8 *DataBufferPtr,                            unsigned int NumBytes);unsigned int XUartLite_Recv(XUartLite *InstancePtr, Xuint8 *DataBufferPtr,                            unsigned int NumBytes);Xboolean XUartLite_IsSending(XUartLite *InstancePtr);XUartLite_Config *XUartLite_LookupConfig(Xuint16 DeviceId);/* * Functions for statistics, in file xuartlite_stats.c */void XUartLite_GetStats(XUartLite *InstancePtr, XUartLite_Stats *StatsPtr);void XUartLite_ClearStats(XUartLite *InstancePtr);/* * Functions for self-test, in file xuartlite_selftest.c */XStatus XUartLite_SelfTest(XUartLite *InstancePtr);/* * Functions for interrupts, in file xuartlite_intr.c */void XUartLite_EnableInterrupt(XUartLite *InstancePtr);void XUartLite_DisableInterrupt(XUartLite *InstancePtr);void XUartLite_SetRecvHandler(XUartLite *InstancePtr, XUartLite_Handler FuncPtr,                              void *CallBackRef);void XUartLite_SetSendHandler(XUartLite *InstancePtr, XUartLite_Handler FuncPtr,                              void *CallBackRef);void XUartLite_InterruptHandler(XUartLite *InstancePtr);#endif            /* end of protection macro */