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41 /****************************************************************************/
44 * @file xscutimer_selftest.c
46 * Contains diagnostic self-test functions for the XScuTimer driver.
49 * MODIFICATION HISTORY:
51 * Ver Who Date Changes
52 * ----- --- -------- ---------------------------------------------
53 * 1.00a nm 03/10/10 First release
56 ******************************************************************************/
58 /***************************** Include Files *********************************/
60 #include "xscutimer.h"
62 /************************** Constant Definitions *****************************/
64 #define XSCUTIMER_SELFTEST_VALUE 0xA55AF00F
66 /**************************** Type Definitions *******************************/
68 /***************** Macros (Inline Functions) Definitions *********************/
70 /************************** Function Prototypes ******************************/
72 /************************** Variable Definitions *****************************/
74 /****************************************************************************/
77 * Run a self-test on the timer. This test clears the timer enable bit in
78 * the control register, writes to the timer load register and verifies the
79 * value read back matches the value written and restores the control register
80 * and the timer load register.
82 * @param InstancePtr is a pointer to the XScuTimer instance.
85 * - XST_SUCCESS if self-test was successful.
86 * - XST_FAILURE if self test was not successful.
90 ******************************************************************************/
91 int XScuTimer_SelfTest(XScuTimer *InstancePtr)
98 * Assert to ensure the inputs are valid and the instance has been
101 Xil_AssertNonvoid(InstancePtr != NULL);
102 Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
105 * Save the contents of the Control Register and stop the timer.
107 CtrlOrig = XScuTimer_ReadReg(InstancePtr->Config.BaseAddr,
108 XSCUTIMER_CONTROL_OFFSET);
109 Register = CtrlOrig & ~XSCUTIMER_CONTROL_ENABLE_MASK;
110 XScuTimer_WriteReg(InstancePtr->Config.BaseAddr,
111 XSCUTIMER_CONTROL_OFFSET, Register);
114 * Save the contents of the Load Register.
115 * Load a new test value in the Load Register, read it back and
116 * compare it with the written value.
118 LoadOrig = XScuTimer_ReadReg((InstancePtr)->Config.BaseAddr,
119 XSCUTIMER_LOAD_OFFSET);
120 XScuTimer_LoadTimer(InstancePtr, XSCUTIMER_SELFTEST_VALUE);
121 Register = XScuTimer_ReadReg((InstancePtr)->Config.BaseAddr,
122 XSCUTIMER_LOAD_OFFSET);
125 * Restore the contents of the Load Register and Control Register.
127 XScuTimer_LoadTimer(InstancePtr, LoadOrig);
128 XScuTimer_WriteReg(InstancePtr->Config.BaseAddr,
129 XSCUTIMER_CONTROL_OFFSET, CtrlOrig);
132 * Return a Failure if the contents of the Load Register do not
133 * match with the value written to it.
135 if (Register != XSCUTIMER_SELFTEST_VALUE) {