/*****************************************************************************
*
* 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_l.h
*
* This header file contains identifiers and low-level driver functions (or
* macros) that can be used to access the device. High-level driver functions
* are defined in xuartlite.h.
*
* <pre>
* MODIFICATION HISTORY:
*
* Ver Who Date Changes
* ----- ---- -------- -----------------------------------------------
* 1.00b rpm 04/25/02 First release
* </pre>
*
*****************************************************************************/
#ifndef XUARTLITE_L_H /* prevent circular inclusions */
#define XUARTLITE_L_H /* by using protection macros */
/***************************** Include Files ********************************/
#include "xbasic_types.h"
#include "xio.h"
/************************** Constant Definitions ****************************/
/* UART Lite register offsets */
#define XUL_RX_FIFO_OFFSET 0 /* receive FIFO, read only */
#define XUL_TX_FIFO_OFFSET 4 /* transmit FIFO, write only */
#define XUL_STATUS_REG_OFFSET 8 /* status register, read only */
#define XUL_CONTROL_REG_OFFSET 12 /* control register, write only */
/* control register bit positions */
#define XUL_CR_ENABLE_INTR 0x10 /* enable interrupt */
#define XUL_CR_FIFO_RX_RESET 0x02 /* reset receive FIFO */
#define XUL_CR_FIFO_TX_RESET 0x01 /* reset transmit FIFO */
/* status register bit positions */
#define XUL_SR_PARITY_ERROR 0x80
#define XUL_SR_FRAMING_ERROR 0x40
#define XUL_SR_OVERRUN_ERROR 0x20
#define XUL_SR_INTR_ENABLED 0x10 /* interrupt enabled */
#define XUL_SR_TX_FIFO_FULL 0x08 /* transmit FIFO full */
#define XUL_SR_TX_FIFO_EMPTY 0x04 /* transmit FIFO empty */
#define XUL_SR_RX_FIFO_FULL 0x02 /* receive FIFO full */
#define XUL_SR_RX_FIFO_VALID_DATA 0x01 /* data in receive FIFO */
/* the following constant specifies the size of the FIFOs, the size of the
* FIFOs includes the transmitter and receiver such that it is the total number
* of bytes that the UART can buffer
*/
#define XUL_FIFO_SIZE 16
/* Stop bits are fixed at 1. Baud, parity, and data bits are fixed on a
* per instance basis
*/
#define XUL_STOP_BITS 1
/* Parity definitions
*/
#define XUL_PARITY_NONE 0
#define XUL_PARITY_ODD 1
#define XUL_PARITY_EVEN 2
/**************************** Type Definitions ******************************/
/***************** Macros (Inline Functions) Definitions ********************/
/*****************************************************************************
*
* Low-level driver macros and functions. The list below provides signatures
* to help the user use the macros.
*
* void XUartLite_mSetControlReg(u32 BaseAddress, u32 Mask)
* u32 XUartLite_mGetControlReg(u32 BaseAddress)
* u32 XUartLite_mGetStatusReg(u32 BaseAddress)
*
* Xboolean XUartLite_mIsReceiveEmpty(u32 BaseAddress)
* Xboolean XUartLite_mIsTransmitFull(u32 BaseAddress)
* Xboolean XUartLite_mIsIntrEnabled(u32 BaseAddress)
*
* void XUartLite_mEnableIntr(u32 BaseAddress)
* void XUartLite_mDisableIntr(u32 BaseAddress)
*
* void XUartLite_SendByte(u32 BaseAddress, u8 Data);
* u8 XUartLite_RecvByte(u32 BaseAddress);
*
*****************************************************************************/
/****************************************************************************/
/**
*
* Set the contents of the control register. Use the XUL_CR_* constants defined
* above to create the bit-mask to be written to the register.
*
* @param BaseAddress is the base address of the device
* @param Mask is the 32-bit value to write to the control register
*
* @return None.
*
* @note None.
*
*****************************************************************************/
#define XUartLite_mSetControlReg(BaseAddress, Mask) \
XIo_Out32((BaseAddress) + XUL_CONTROL_REG_OFFSET, (Mask))
/****************************************************************************/
/**
*
* Get the contents of the control register. Use the XUL_CR_* constants defined
* above to interpret the bit-mask returned.
*
* @param BaseAddress is the base address of the device
*
* @return A 32-bit value representing the contents of the control register.
*
* @note None.
*
*****************************************************************************/
#define XUartLite_mGetControlReg(BaseAddress) \
XIo_In32((BaseAddress) + XUL_CONTROL_REG_OFFSET)
/****************************************************************************/
/**
*
* Get the contents of the status register. Use the XUL_SR_* constants defined
* above to interpret the bit-mask returned.
*
* @param BaseAddress is the base address of the device
*
* @return A 32-bit value representing the contents of the status register.
*
* @note None.
*
*****************************************************************************/
#define XUartLite_mGetStatusReg(BaseAddress) \
XIo_In32((BaseAddress) + XUL_STATUS_REG_OFFSET)
/****************************************************************************/
/**
*
* Check to see if the receiver has data.
*
* @param BaseAddress is the base address of the device
*
* @return XTRUE if the receiver is empty, XFALSE if there is data present.
*
* @note None.
*
*****************************************************************************/
#define XUartLite_mIsReceiveEmpty(BaseAddress) \
(!(XUartLite_mGetStatusReg((BaseAddress)) & XUL_SR_RX_FIFO_VALID_DATA))
/****************************************************************************/
/**
*
* Check to see if the transmitter is full.
*
* @param BaseAddress is the base address of the device
*
* @return XTRUE if the transmitter is full, XFALSE otherwise.
*
* @note None.
*
*****************************************************************************/
#define XUartLite_mIsTransmitFull(BaseAddress) \
(XUartLite_mGetStatusReg((BaseAddress)) & XUL_SR_TX_FIFO_FULL)
/****************************************************************************/
/**
*
* Check to see if the interrupt is enabled.
*
* @param BaseAddress is the base address of the device
*
* @return XTRUE if the interrupt is enabled, XFALSE otherwise.
*
* @note None.
*
*****************************************************************************/
#define XUartLite_mIsIntrEnabled(BaseAddress) \
(XUartLite_mGetStatusReg((BaseAddress)) & XUL_SR_INTR_ENABLED)
/****************************************************************************/
/**
*
* Enable the device interrupt. Preserve the contents of the control register.
*
* @param BaseAddress is the base address of the device
*
* @return None.
*
* @note None.
*
*****************************************************************************/
#define XUartLite_mEnableIntr(BaseAddress) \
XUartLite_mSetControlReg((BaseAddress), \
XUartLite_mGetControlReg((BaseAddress)) | XUL_CR_ENABLE_INTR)
/****************************************************************************/
/**
*
* Disable the device interrupt. Preserve the contents of the control register.
*
* @param BaseAddress is the base address of the device
*
* @return None.
*
* @note None.
*
*****************************************************************************/
#define XUartLite_mDisableIntr(BaseAddress) \
XUartLite_mSetControlReg((BaseAddress), \
XUartLite_mGetControlReg((BaseAddress)) & ~XUL_CR_ENABLE_INTR)
/************************** Function Prototypes *****************************/
void XUartLite_SendByte(u32 BaseAddress, u8 Data);
u8 XUartLite_RecvByte(u32 BaseAddress);
#endif /* end of protection macro */
