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32 /****************************************************************************/
35 * @file xscutimer_selftest.c
37 * Contains diagnostic self-test functions for the XScuTimer driver.
40 * MODIFICATION HISTORY:
42 * Ver Who Date Changes
43 * ----- --- -------- ---------------------------------------------
44 * 1.00a nm 03/10/10 First release
47 ******************************************************************************/
49 /***************************** Include Files *********************************/
51 #include "xscutimer.h"
53 /************************** Constant Definitions *****************************/
55 #define XSCUTIMER_SELFTEST_VALUE 0xA55AF00F
57 /**************************** Type Definitions *******************************/
59 /***************** Macros (Inline Functions) Definitions *********************/
61 /************************** Function Prototypes ******************************/
63 /************************** Variable Definitions *****************************/
65 /****************************************************************************/
68 * Run a self-test on the timer. This test clears the timer enable bit in
69 * the control register, writes to the timer load register and verifies the
70 * value read back matches the value written and restores the control register
71 * and the timer load register.
73 * @param InstancePtr is a pointer to the XScuTimer instance.
76 * - XST_SUCCESS if self-test was successful.
77 * - XST_FAILURE if self test was not successful.
81 ******************************************************************************/
82 int XScuTimer_SelfTest(XScuTimer *InstancePtr)
89 * Assert to ensure the inputs are valid and the instance has been
92 Xil_AssertNonvoid(InstancePtr != NULL);
93 Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
96 * Save the contents of the Control Register and stop the timer.
98 CtrlOrig = XScuTimer_ReadReg(InstancePtr->Config.BaseAddr,
99 XSCUTIMER_CONTROL_OFFSET);
100 Register = CtrlOrig & ~XSCUTIMER_CONTROL_ENABLE_MASK;
101 XScuTimer_WriteReg(InstancePtr->Config.BaseAddr,
102 XSCUTIMER_CONTROL_OFFSET, Register);
105 * Save the contents of the Load Register.
106 * Load a new test value in the Load Register, read it back and
107 * compare it with the written value.
109 LoadOrig = XScuTimer_ReadReg((InstancePtr)->Config.BaseAddr,
110 XSCUTIMER_LOAD_OFFSET);
111 XScuTimer_LoadTimer(InstancePtr, XSCUTIMER_SELFTEST_VALUE);
112 Register = XScuTimer_ReadReg((InstancePtr)->Config.BaseAddr,
113 XSCUTIMER_LOAD_OFFSET);
116 * Restore the contents of the Load Register and Control Register.
118 XScuTimer_LoadTimer(InstancePtr, LoadOrig);
119 XScuTimer_WriteReg(InstancePtr->Config.BaseAddr,
120 XSCUTIMER_CONTROL_OFFSET, CtrlOrig);
123 * Return a Failure if the contents of the Load Register do not
124 * match with the value written to it.
126 if (Register != XSCUTIMER_SELFTEST_VALUE) {