/* $Id: xgpio.c,v 1.8 2002/09/19 20:35:52 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 Xilinx Inc.*       All rights reserved.*******************************************************************************//*** @file xgpio.c** The implementation of the XGpio component's basic functionality. See xgpio.h* for more information about the component.** @note** None******************************************************************************//***************************** Include Files ********************************/#include "xparameters.h"#include "xgpio.h"#include "xgpio_i.h"#include "xstatus.h"/************************** Constant Definitions ****************************//**************************** Type Definitions ******************************//***************** Macros (Inline Functions) Definitions ********************//************************** Variable Definitions ****************************//************************** Function Prototypes *****************************//****************************************************************************//*** Initialize the XGpio instance provided by the caller based on the* given DeviceID.** Nothing is done except to initialize the InstancePtr.** @param InstancePtr is a pointer to an XGpio instance. The memory the pointer*        references must be pre-allocated by the caller. Further calls to*        manipulate the component through the XGpio API must be made with this*        pointer.** @param DeviceId is the unique id of the device controlled by this XGpio*        component.  Passing in a device id associates the generic XGpio*        instance to a specific device, as chosen by the caller or application*        developer.** @return** - XST_SUCCESS           Initialization was successfull.* - XST_DEVICE_NOT_FOUND  Device configuration data was not found for a device*                         with the supplied device ID.** NOTES:** None******************************************************************************/XStatus XGpio_Initialize(XGpio *InstancePtr, Xuint16 DeviceId){    XGpio_Config *ConfigPtr;    /*     * Assert arguments     */    XASSERT_NONVOID(InstancePtr != XNULL);    /*     * Lookup configuration data in the device configuration table.     * Use this configuration info down below when initializing this component.     */    ConfigPtr = XGpio_LookupConfig(DeviceId);    if (ConfigPtr == (XGpio_Config *)XNULL)    {        InstancePtr->IsReady = 0;        return(XST_DEVICE_NOT_FOUND);    }    /*     * Set some default values.     */    InstancePtr->BaseAddress = ConfigPtr->BaseAddress;    /*     * Indicate the instance is now ready to use, initialized without error     */    InstancePtr->IsReady = XCOMPONENT_IS_READY;    return(XST_SUCCESS);}/******************************************************************************//*** Lookup the device configuration based on the unique device ID.  The table* ConfigTable contains the configuration info for each device in the system.** @param DeviceID is the device identifier to lookup.** @return** - XGpio configuration structure pointer if DeviceID is found.* - XNULL if DeviceID is not found.*******************************************************************************/XGpio_Config *XGpio_LookupConfig(Xuint16 DeviceId){    XGpio_Config *CfgPtr = XNULL;    int i;    for (i=0; i < XPAR_XGPIO_NUM_INSTANCES; i++)    {        if (XGpio_ConfigTable[i].DeviceId == DeviceId)        {            CfgPtr = &XGpio_ConfigTable[i];            break;        }    }    return CfgPtr;}/****************************************************************************//*** Set the input/output direction of all discrete signals.** @param InstancePtr is a pointer to an XGpio instance to be worked on.* @param DirectionMask is a bitmask specifying which discretes are input and*        which are output. Bits set to 0 are output and bits set to 1 are input.** @note** None******************************************************************************/void XGpio_SetDataDirection(XGpio *InstancePtr, Xuint32 DirectionMask){    XASSERT_VOID(InstancePtr != XNULL);    XASSERT_VOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);    XGpio_mWriteReg(InstancePtr->BaseAddress, XGPIO_TRI_OFFSET,                    DirectionMask);}/****************************************************************************//*** Read state of discretes.** @param InstancePtr is a pointer to an XGpio instance to be worked on.** @return Current copy of the discretes register.** @note** None******************************************************************************/Xuint32 XGpio_DiscreteRead(XGpio *InstancePtr){    XASSERT_NONVOID(InstancePtr != XNULL);    XASSERT_NONVOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);    return(XGpio_mReadReg(InstancePtr->BaseAddress, XGPIO_DATA_OFFSET));}/****************************************************************************//*** Write to discretes register** @param InstancePtr is a pointer to an XGpio instance to be worked on.* @param Data is the value to be written to the discretes register.** @note** See also XGpio_DiscreteSet() and XGpio_DiscreteClear().******************************************************************************/void XGpio_DiscreteWrite(XGpio *InstancePtr, Xuint32 Data){    XASSERT_VOID(InstancePtr != XNULL);    XASSERT_VOID(InstancePtr->IsReady == XCOMPONENT_IS_READY);    XGpio_mWriteReg(InstancePtr->BaseAddress, XGPIO_DATA_OFFSET, Data);}