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32 /****************************************************************************/
35 * @file xscutimer_selftest.c
36 * @addtogroup scutimer_v2_0
39 * Contains diagnostic self-test functions for the XScuTimer driver.
42 * MODIFICATION HISTORY:
44 * Ver Who Date Changes
45 * ----- --- -------- ---------------------------------------------
46 * 1.00a nm 03/10/10 First release
49 ******************************************************************************/
51 /***************************** Include Files *********************************/
53 #include "xscutimer.h"
55 /************************** Constant Definitions *****************************/
57 #define XSCUTIMER_SELFTEST_VALUE 0xA55AF00F
59 /**************************** Type Definitions *******************************/
61 /***************** Macros (Inline Functions) Definitions *********************/
63 /************************** Function Prototypes ******************************/
65 /************************** Variable Definitions *****************************/
67 /****************************************************************************/
70 * Run a self-test on the timer. This test clears the timer enable bit in
71 * the control register, writes to the timer load register and verifies the
72 * value read back matches the value written and restores the control register
73 * and the timer load register.
75 * @param InstancePtr is a pointer to the XScuTimer instance.
78 * - XST_SUCCESS if self-test was successful.
79 * - XST_FAILURE if self test was not successful.
83 ******************************************************************************/
84 int XScuTimer_SelfTest(XScuTimer *InstancePtr)
91 * Assert to ensure the inputs are valid and the instance has been
94 Xil_AssertNonvoid(InstancePtr != NULL);
95 Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
98 * Save the contents of the Control Register and stop the timer.
100 CtrlOrig = XScuTimer_ReadReg(InstancePtr->Config.BaseAddr,
101 XSCUTIMER_CONTROL_OFFSET);
102 Register = CtrlOrig & ~XSCUTIMER_CONTROL_ENABLE_MASK;
103 XScuTimer_WriteReg(InstancePtr->Config.BaseAddr,
104 XSCUTIMER_CONTROL_OFFSET, Register);
107 * Save the contents of the Load Register.
108 * Load a new test value in the Load Register, read it back and
109 * compare it with the written value.
111 LoadOrig = XScuTimer_ReadReg((InstancePtr)->Config.BaseAddr,
112 XSCUTIMER_LOAD_OFFSET);
113 XScuTimer_LoadTimer(InstancePtr, XSCUTIMER_SELFTEST_VALUE);
114 Register = XScuTimer_ReadReg((InstancePtr)->Config.BaseAddr,
115 XSCUTIMER_LOAD_OFFSET);
118 * Restore the contents of the Load Register and Control Register.
120 XScuTimer_LoadTimer(InstancePtr, LoadOrig);
121 XScuTimer_WriteReg(InstancePtr->Config.BaseAddr,
122 XSCUTIMER_CONTROL_OFFSET, CtrlOrig);
125 * Return a Failure if the contents of the Load Register do not
126 * match with the value written to it.
128 if (Register != XSCUTIMER_SELFTEST_VALUE) {