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32 /****************************************************************************/
35 * @file xscuwdt_selftest.c
37 * Contains diagnostic self-test functions for the XScuWdt driver.
40 * MODIFICATION HISTORY:
42 * Ver Who Date Changes
43 * ----- --- -------- ---------------------------------------------
44 * 1.00a sdm 01/15/10 First release
47 ******************************************************************************/
49 /***************************** Include Files *********************************/
53 /************************** Constant Definitions *****************************/
55 /**************************** Type Definitions *******************************/
57 /***************** Macros (Inline Functions) Definitions *********************/
59 /************************** Function Prototypes ******************************/
61 /************************** Variable Definitions *****************************/
63 /****************************************************************************/
66 * Run a self-test on the WDT. This test stops the watchdog, writes a value to
67 * the watchdog load register, starts the watchdog and verifies that the value
68 * read from the counter register is less that the value written to the load
69 * register. It then restores the control register and the watchdog load
72 * @param InstancePtr is a pointer to the XScuWdt instance.
75 * - XST_SUCCESS if self-test was successful.
76 * - XST_FAILURE if the WDT is not decrementing.
80 ******************************************************************************/
81 int XScuWdt_SelfTest(XScuWdt *InstancePtr)
88 * Assert to ensure the inputs are valid and the instance has been
91 Xil_AssertNonvoid(InstancePtr != NULL);
92 Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
95 * Stop the watchdog timer.
97 CtrlOrig = XScuWdt_GetControlReg(InstancePtr);
98 XScuWdt_SetControlReg(InstancePtr,
99 CtrlOrig & ~XSCUWDT_CONTROL_WD_ENABLE_MASK);
101 LoadOrig = XScuWdt_ReadReg((InstancePtr)->Config.BaseAddr,
102 XSCUWDT_LOAD_OFFSET);
103 XScuWdt_LoadWdt(InstancePtr, 0xFFFFFFFF);
106 * Start the watchdog timer and check if the watchdog counter is
109 XScuWdt_SetControlReg(InstancePtr,
110 CtrlOrig | XSCUWDT_CONTROL_WD_ENABLE_MASK);
112 Register = XScuWdt_ReadReg((InstancePtr)->Config.BaseAddr,
113 XSCUWDT_COUNTER_OFFSET);
115 XScuWdt_LoadWdt(InstancePtr, LoadOrig);
116 XScuWdt_SetControlReg(InstancePtr, CtrlOrig);
118 if (Register == 0xFFFFFFFF) {