/* $Id: xgpio_extra.c,v 1.1 2006/02/16 23:28:46 moleres 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 -2004 Xilinx Inc.*       All rights reserved.*******************************************************************************//*** @file xgpio_extra.c** The implementation of the XGpio component's advanced discrete functions.* See xgpio.h for more information about the component.** @note** None** <pre>* MODIFICATION HISTORY:** Ver   Who  Date     Changes* ----- ---- -------- -----------------------------------------------* 1.00a rmm  02/04/02 First release* 2.00a jhl  12/16/02 Update for dual channel and interrupt support* </pre>******************************************************************************//***************************** Include Files ********************************/#include "xgpio.h"#include "xgpio_i.h"/************************** Constant Definitions ****************************//**************************** Type Definitions ******************************//***************** Macros (Inline Functions) Definitions ********************//************************** Variable Definitions ****************************//************************** Function Prototypes *****************************//****************************************************************************//*** Set output discrete(s) to logic 1 for the specified GPIO channel.** @param InstancePtr is a pointer to an XGpio instance to be worked on.* @param Channel contains the channel of the GPIO (1 or 2) to operate on.* @param Mask is the set of bits that will be set to 1 in the discrete data*        register. All other bits in the data register are unaffected.** @return** None.** @note** The hardware must be built for dual channels if this function is used * with any channel other than 1.  If it is not, this function will assert.******************************************************************************/void XGpio_DiscreteSet(XGpio *InstancePtr, unsigned Channel, Xuint32 Mask){    Xuint32 Current;    unsigned DataOffset;    XASSERT_VOID(InstancePtr != XNULL);    XASSERT_VOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);    XASSERT_VOID((Channel == 1)  ||                  ((Channel == 2) &&                   (InstancePtr->IsDual == XTRUE)));     /* Calculate the offset to the data register of the GPIO once */        DataOffset = ((Channel - 1) * XGPIO_CHAN_OFFSET) + XGPIO_DATA_OFFSET;    /*     * Read the contents of the data register, merge in Mask and write     * back results     */    Current = XGpio_mReadReg(InstancePtr->BaseAddress, DataOffset);    Current |= Mask;    XGpio_mWriteReg(InstancePtr->BaseAddress, DataOffset, Current);}/****************************************************************************//*** Set output discrete(s) to logic 0 for the specified GPIO channel.** @param InstancePtr is a pointer to an XGpio instance to be worked on.* @param Channel contains the channel of the GPIO (1 or 2) to operate on.* @param Mask is the set of bits that will be set to 0 in the discrete data*        register. All other bits in the data register are unaffected.** @return** None.** @note** The hardware must be built for dual channels if this function is used * with any channel other than 1.  If it is not, this function will assert.******************************************************************************/void XGpio_DiscreteClear(XGpio *InstancePtr, unsigned Channel, Xuint32 Mask){    Xuint32 Current;    unsigned DataOffset;    XASSERT_VOID(InstancePtr != XNULL);    XASSERT_VOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);    XASSERT_VOID((Channel == 1)  ||                  ((Channel == 2) &&                   (InstancePtr->IsDual == XTRUE)));     /* Calculate the offset to the data register of the GPIO once */        DataOffset = ((Channel - 1) * XGPIO_CHAN_OFFSET) + XGPIO_DATA_OFFSET;    /*     * Read the contents of the data register, merge in Mask and write     * back results     */    Current = XGpio_mReadReg(InstancePtr->BaseAddress, DataOffset);    Current &= ~Mask;    XGpio_mWriteReg(InstancePtr->BaseAddress, DataOffset, Current);}