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32 /****************************************************************************/
35 * @file xscuwdt_selftest.c
36 * @addtogroup scuwdt_v2_0
39 * Contains diagnostic self-test functions for the XScuWdt driver.
42 * MODIFICATION HISTORY:
44 * Ver Who Date Changes
45 * ----- --- -------- ---------------------------------------------
46 * 1.00a sdm 01/15/10 First release
49 ******************************************************************************/
51 /***************************** Include Files *********************************/
55 /************************** Constant Definitions *****************************/
57 /**************************** Type Definitions *******************************/
59 /***************** Macros (Inline Functions) Definitions *********************/
61 /************************** Function Prototypes ******************************/
63 /************************** Variable Definitions *****************************/
65 /****************************************************************************/
68 * Run a self-test on the WDT. This test stops the watchdog, writes a value to
69 * the watchdog load register, starts the watchdog and verifies that the value
70 * read from the counter register is less that the value written to the load
71 * register. It then restores the control register and the watchdog load
74 * @param InstancePtr is a pointer to the XScuWdt instance.
77 * - XST_SUCCESS if self-test was successful.
78 * - XST_FAILURE if the WDT is not decrementing.
82 ******************************************************************************/
83 int XScuWdt_SelfTest(XScuWdt *InstancePtr)
90 * Assert to ensure the inputs are valid and the instance has been
93 Xil_AssertNonvoid(InstancePtr != NULL);
94 Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
97 * Stop the watchdog timer.
99 CtrlOrig = XScuWdt_GetControlReg(InstancePtr);
100 XScuWdt_SetControlReg(InstancePtr,
101 CtrlOrig & ~XSCUWDT_CONTROL_WD_ENABLE_MASK);
103 LoadOrig = XScuWdt_ReadReg((InstancePtr)->Config.BaseAddr,
104 XSCUWDT_LOAD_OFFSET);
105 XScuWdt_LoadWdt(InstancePtr, 0xFFFFFFFF);
108 * Start the watchdog timer and check if the watchdog counter is
111 XScuWdt_SetControlReg(InstancePtr,
112 CtrlOrig | XSCUWDT_CONTROL_WD_ENABLE_MASK);
114 Register = XScuWdt_ReadReg((InstancePtr)->Config.BaseAddr,
115 XSCUWDT_COUNTER_OFFSET);
117 XScuWdt_LoadWdt(InstancePtr, LoadOrig);
118 XScuWdt_SetControlReg(InstancePtr, CtrlOrig);
120 if (Register == 0xFFFFFFFF) {