1 /******************************************************************************
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31 ******************************************************************************/
32 /*****************************************************************************/
36 * The implementation of the XGpio driver's static initialzation
44 * MODIFICATION HISTORY:
46 * Ver Who Date Changes
47 * ----- ---- -------- -----------------------------------------------
48 * 2.01a jvb 10/13/05 First release
49 * 2.11a mta 03/21/07 Updated to new coding style
52 *****************************************************************************/
54 /***************************** Include Files ********************************/
57 #include "xparameters.h"
60 /************************** Constant Definitions ****************************/
62 /**************************** Type Definitions ******************************/
64 /***************** Macros (Inline Functions) Definitions ********************/
66 /************************** Variable Definitions ****************************/
69 /************************** Function Prototypes *****************************/
72 /******************************************************************************/
74 * Lookup the device configuration based on the unique device ID. The table
75 * ConfigTable contains the configuration info for each device in the system.
77 * @param DeviceId is the device identifier to lookup.
80 * - A pointer of data type XGpio_Config which points to the
81 * device configuration if DeviceID is found.
82 * - NULL if DeviceID is not found.
86 ******************************************************************************/
87 XGpio_Config *XGpio_LookupConfig(u16 DeviceId)
89 XGpio_Config *CfgPtr = NULL;
93 for (Index = 0; Index < XPAR_XGPIO_NUM_INSTANCES; Index++) {
94 if (XGpio_ConfigTable[Index].DeviceId == DeviceId) {
95 CfgPtr = &XGpio_ConfigTable[Index];
104 /****************************************************************************/
106 * Initialize the XGpio instance provided by the caller based on the
109 * Nothing is done except to initialize the InstancePtr.
111 * @param InstancePtr is a pointer to an XGpio instance. The memory the
112 * pointer references must be pre-allocated by the caller. Further
113 * calls to manipulate the instance/driver through the XGpio API
114 * must be made with this pointer.
115 * @param DeviceId is the unique id of the device controlled by this XGpio
116 * instance. Passing in a device id associates the generic XGpio
117 * instance to a specific device, as chosen by the caller or
118 * application developer.
121 * - XST_SUCCESS if the initialization was successfull.
122 * - XST_DEVICE_NOT_FOUND if the device configuration data was not
123 * found for a device with the supplied device ID.
127 *****************************************************************************/
128 int XGpio_Initialize(XGpio * InstancePtr, u16 DeviceId)
130 XGpio_Config *ConfigPtr;
135 Xil_AssertNonvoid(InstancePtr != NULL);
138 * Lookup configuration data in the device configuration table.
139 * Use this configuration info down below when initializing this
142 ConfigPtr = XGpio_LookupConfig(DeviceId);
143 if (ConfigPtr == (XGpio_Config *) NULL) {
144 InstancePtr->IsReady = 0;
145 return (XST_DEVICE_NOT_FOUND);
148 return XGpio_CfgInitialize(InstancePtr, ConfigPtr,
149 ConfigPtr->BaseAddress);