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31 ******************************************************************************/
32 /*****************************************************************************/
35 * @addtogroup gpio_v4_1
38 * The implementation of the XGpio driver's static initialzation
46 * MODIFICATION HISTORY:
48 * Ver Who Date Changes
49 * ----- ---- -------- -----------------------------------------------
50 * 2.01a jvb 10/13/05 First release
51 * 2.11a mta 03/21/07 Updated to new coding style
52 * 4.0 sha 07/15/15 Defined macro XPAR_XGPIO_NUM_INSTANCES if not
53 * defined in xparameters.h
56 *****************************************************************************/
58 /***************************** Include Files ********************************/
61 #include "xparameters.h"
64 /************************** Constant Definitions ****************************/
66 #ifndef XPAR_XGPIO_NUM_INSTANCES
67 #define XPAR_XGPIO_NUM_INSTANCES 0
70 /**************************** Type Definitions ******************************/
72 /***************** Macros (Inline Functions) Definitions ********************/
74 /************************** Variable Definitions ****************************/
77 /************************** Function Prototypes *****************************/
80 /******************************************************************************/
82 * Lookup the device configuration based on the unique device ID. The table
83 * ConfigTable contains the configuration info for each device in the system.
85 * @param DeviceId is the device identifier to lookup.
88 * - A pointer of data type XGpio_Config which points to the
89 * device configuration if DeviceID is found.
90 * - NULL if DeviceID is not found.
94 ******************************************************************************/
95 XGpio_Config *XGpio_LookupConfig(u16 DeviceId)
97 XGpio_Config *CfgPtr = NULL;
101 for (Index = 0; Index < XPAR_XGPIO_NUM_INSTANCES; Index++) {
102 if (XGpio_ConfigTable[Index].DeviceId == DeviceId) {
103 CfgPtr = &XGpio_ConfigTable[Index];
112 /****************************************************************************/
114 * Initialize the XGpio instance provided by the caller based on the
117 * Nothing is done except to initialize the InstancePtr.
119 * @param InstancePtr is a pointer to an XGpio instance. The memory the
120 * pointer references must be pre-allocated by the caller. Further
121 * calls to manipulate the instance/driver through the XGpio API
122 * must be made with this pointer.
123 * @param DeviceId is the unique id of the device controlled by this XGpio
124 * instance. Passing in a device id associates the generic XGpio
125 * instance to a specific device, as chosen by the caller or
126 * application developer.
129 * - XST_SUCCESS if the initialization was successfull.
130 * - XST_DEVICE_NOT_FOUND if the device configuration data was not
131 * found for a device with the supplied device ID.
135 *****************************************************************************/
136 int XGpio_Initialize(XGpio * InstancePtr, u16 DeviceId)
138 XGpio_Config *ConfigPtr;
143 Xil_AssertNonvoid(InstancePtr != NULL);
146 * Lookup configuration data in the device configuration table.
147 * Use this configuration info down below when initializing this
150 ConfigPtr = XGpio_LookupConfig(DeviceId);
151 if (ConfigPtr == (XGpio_Config *) NULL) {
152 InstancePtr->IsReady = 0;
153 return (XST_DEVICE_NOT_FOUND);
156 return XGpio_CfgInitialize(InstancePtr, ConfigPtr,
157 ConfigPtr->BaseAddress);