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41 /****************************************************************************/
44 * @file xscuwdt_selftest.c
46 * Contains diagnostic self-test functions for the XScuWdt driver.
49 * MODIFICATION HISTORY:
51 * Ver Who Date Changes
52 * ----- --- -------- ---------------------------------------------
53 * 1.00a sdm 01/15/10 First release
56 ******************************************************************************/
58 /***************************** Include Files *********************************/
62 /************************** Constant Definitions *****************************/
64 /**************************** Type Definitions *******************************/
66 /***************** Macros (Inline Functions) Definitions *********************/
68 /************************** Function Prototypes ******************************/
70 /************************** Variable Definitions *****************************/
72 /****************************************************************************/
75 * Run a self-test on the WDT. This test stops the watchdog, writes a value to
76 * the watchdog load register, starts the watchdog and verifies that the value
77 * read from the counter register is less that the value written to the load
78 * register. It then restores the control register and the watchdog load
81 * @param InstancePtr is a pointer to the XScuWdt instance.
84 * - XST_SUCCESS if self-test was successful.
85 * - XST_FAILURE if the WDT is not decrementing.
89 ******************************************************************************/
90 int XScuWdt_SelfTest(XScuWdt *InstancePtr)
97 * Assert to ensure the inputs are valid and the instance has been
100 Xil_AssertNonvoid(InstancePtr != NULL);
101 Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
104 * Stop the watchdog timer.
106 CtrlOrig = XScuWdt_GetControlReg(InstancePtr);
107 XScuWdt_SetControlReg(InstancePtr,
108 CtrlOrig & ~XSCUWDT_CONTROL_WD_ENABLE_MASK);
110 LoadOrig = XScuWdt_ReadReg((InstancePtr)->Config.BaseAddr,
111 XSCUWDT_LOAD_OFFSET);
112 XScuWdt_LoadWdt(InstancePtr, 0xFFFFFFFF);
115 * Start the watchdog timer and check if the watchdog counter is
118 XScuWdt_SetControlReg(InstancePtr,
119 CtrlOrig | XSCUWDT_CONTROL_WD_ENABLE_MASK);
121 Register = XScuWdt_ReadReg((InstancePtr)->Config.BaseAddr,
122 XSCUWDT_COUNTER_OFFSET);
124 XScuWdt_LoadWdt(InstancePtr, LoadOrig);
125 XScuWdt_SetControlReg(InstancePtr, CtrlOrig);
127 if (Register == 0xFFFFFFFF) {