/* $Id: xuartlite.h,v 1.1.2.1 2009/11/24 05:14:28 svemula Exp $ */
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/**
*
* @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.
*
* Initialization & Configuration
*
* The XUartLite_Config structure is used by the driver to configure itself. This
* configuration structure is typically created by the tool-chain based on HW
* build properties.
*
* To support multiple runtime loading and initialization strategies employed
* by various operating systems, the driver instance can be initialized in one
* of the following ways:
*
* - XUartLite_Initialize(InstancePtr, DeviceId) - The driver looks up its own
* configuration structure created by the tool-chain based on an ID provided
* by the tool-chain.
*
* - XUartLite_CfgInitialize(InstancePtr, CfgPtr, EffectiveAddr) - Uses a
* configuration structure provided by the caller. If running in a system
* with address translation, the provided virtual memory base address
* replaces the physical address present in the configuration structure.
*
* RTOS Independence
*
* 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.
*
*
* 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
* 1.01a jvb 12/14/05 I separated dependency on the static config table and
* xparameters.h from the driver initialization by moving
* _Initialize and _LookupConfig to _sinit.c. I also added
* the new _CfgInitialize routine.
* 1.02a rpm 02/14/07 Added check for outstanding transmission before
* calling the send callback (avoids extraneous
* callback invocations) in interrupt service routine.
* 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 08/22/08 Removed support for static interrupt handlers from the MDD
* file
* 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.
*
*
*****************************************************************************/
#ifndef XUARTLITE_H /* prevent circular inclusions */
#define XUARTLITE_H /* by using protection macros */
#ifdef __cplusplus
extern "C" {
#endif
/***************************** Include Files ********************************/
#include "xil_types.h"
#include "xil_assert.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 {
u32 TransmitInterrupts; /**< Number of transmit interrupts */
u32 ReceiveInterrupts; /**< Number of receive interrupts */
u32 CharactersTransmitted; /**< Number of characters transmitted */
u32 CharactersReceived; /**< Number of characters received */
u32 ReceiveOverrunErrors; /**< Number of receive overruns */
u32 ReceiveParityErrors; /**< Number of receive parity errors */
u32 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 {
u8 *NextBytePtr;
unsigned int RequestedBytes;
unsigned int RemainingBytes;
} XUartLite_Buffer;
/**
* This typedef contains configuration information for the device.
*/
typedef struct {
u16 DeviceId; /**< Unique ID of device */
u32 RegBaseAddr; /**< Register base address */
u32 BaudRate; /**< Fixed baud rate */
u8 UseParity; /**< Parity generator enabled when TRUE */
u8 ParityOdd; /**< Parity generated is odd when TRUE, even
when FALSE */
u8 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 */
u32 RegBaseAddress; /* Base address of registers */
u32 IsReady; /* Device is initialized and ready */
XUartLite_Buffer SendBuffer;
XUartLite_Buffer ReceiveBuffer;
XUartLite_Handler RecvHandler;
void *RecvCallBackRef; /* Callback ref for recv handler */
XUartLite_Handler SendHandler;
void *SendCallBackRef; /* Callback ref for send handler */
} XUartLite;
/***************** Macros (Inline Functions) Definitions ********************/
/************************** Function Prototypes *****************************/
/*
* Initialization functions in xuartlite_sinit.c
*/
int XUartLite_Initialize(XUartLite *InstancePtr, u16 DeviceId);
XUartLite_Config *XUartLite_LookupConfig(u16 DeviceId);
/*
* Required functions, in file xuart.c
*/
int XUartLite_CfgInitialize(XUartLite *InstancePtr,
XUartLite_Config *Config,
u32 EffectiveAddr);
void XUartLite_ResetFifos(XUartLite *InstancePtr);
unsigned int XUartLite_Send(XUartLite *InstancePtr, u8 *DataBufferPtr,
unsigned int NumBytes);
unsigned int XUartLite_Recv(XUartLite *InstancePtr, u8 *DataBufferPtr,
unsigned int NumBytes);
int XUartLite_IsSending(XUartLite *InstancePtr);
/*
* 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
*/
int 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);
#ifdef __cplusplus
}
#endif
#endif /* end of protection macro */