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32 /****************************************************************************/
35 * @file xuartps_selftest.c
37 * This file contains the self-test functions for the XUartPs driver.
40 * MODIFICATION HISTORY:
42 * Ver Who Date Changes
43 * ----- ------ -------- -----------------------------------------------
44 * 1.00 drg/jz 01/13/108First Release
47 ******************************************************************************/
49 /***************************** Include Files *********************************/
54 /************************** Constant Definitions *****************************/
57 /**************************** Type Definitions *******************************/
60 /***************** Macros (Inline Functions) Definitions *********************/
62 #define XUARTPS_TOTAL_BYTES 32
64 /************************** Variable Definitions *****************************/
66 static u8 TestString[XUARTPS_TOTAL_BYTES]="abcdefghABCDEFGH012345677654321";
67 static u8 ReturnString[XUARTPS_TOTAL_BYTES];
69 /************************** Function Prototypes ******************************/
72 /****************************************************************************/
75 * This function runs a self-test on the driver and hardware device. This self
76 * test performs a local loopback and verifies data can be sent and received.
78 * The time for this test is proportional to the baud rate that has been set
79 * prior to calling this function.
81 * The mode and control registers are restored before return.
83 * @param InstancePtr is a pointer to the XUartPs instance
86 * - XST_SUCCESS if the test was successful
87 * - XST_UART_TEST_FAIL if the test failed looping back the data
91 * This function can hang if the hardware is not functioning properly.
93 ******************************************************************************/
94 int XUartPs_SelfTest(XUartPs *InstancePtr)
96 int Status = XST_SUCCESS;
102 * Assert validates the input arguments
104 Xil_AssertNonvoid(InstancePtr != NULL);
105 Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
108 * Disable all interrupts in the interrupt disable register
110 IntrRegister = XUartPs_ReadReg(InstancePtr->Config.BaseAddress,
112 XUartPs_WriteReg(InstancePtr->Config.BaseAddress, XUARTPS_IDR_OFFSET,
116 * Setup for local loopback
118 ModeRegister = XUartPs_ReadReg(InstancePtr->Config.BaseAddress,
120 XUartPs_WriteReg(InstancePtr->Config.BaseAddress, XUARTPS_MR_OFFSET,
121 ((ModeRegister & (~XUARTPS_MR_CHMODE_MASK)) |
122 XUARTPS_MR_CHMODE_L_LOOP));
125 * Send a number of bytes and receive them, one at a time.
127 for (Index = 0; Index < XUARTPS_TOTAL_BYTES; Index++) {
129 * Send out the byte and if it was not sent then the failure
130 * will be caught in the comparison at the end
132 XUartPs_Send(InstancePtr, &TestString[Index], 1);
135 * Wait until the byte is received. This can hang if the HW
136 * is broken. Watch for the FIFO empty flag to be false.
138 while (!(XUartPs_IsReceiveData(InstancePtr->Config.
144 XUartPs_Recv(InstancePtr, &ReturnString[Index], 1);
148 * Compare the bytes received to the bytes sent to verify the exact data
151 for (Index = 0; Index < XUARTPS_TOTAL_BYTES; Index++) {
152 if (TestString[Index] != ReturnString[Index]) {
153 Status = XST_UART_TEST_FAIL;
158 * Restore the registers which were altered to put into polling and
159 * loopback modes so that this test is not destructive
161 XUartPs_WriteReg(InstancePtr->Config.BaseAddress, XUARTPS_IER_OFFSET,
163 XUartPs_WriteReg(InstancePtr->Config.BaseAddress, XUARTPS_MR_OFFSET,