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32 /****************************************************************************/
35 * @file xuartps_selftest.c
36 * @addtogroup uartps_v2_1
39 * This file contains the self-test functions for the XUartPs driver.
42 * MODIFICATION HISTORY:
44 * Ver Who Date Changes
45 * ----- ------ -------- -----------------------------------------------
46 * 1.00 drg/jz 01/13/108First Release
49 ******************************************************************************/
51 /***************************** Include Files *********************************/
56 /************************** Constant Definitions *****************************/
59 /**************************** Type Definitions *******************************/
62 /***************** Macros (Inline Functions) Definitions *********************/
64 #define XUARTPS_TOTAL_BYTES 32
66 /************************** Variable Definitions *****************************/
68 static u8 TestString[XUARTPS_TOTAL_BYTES]="abcdefghABCDEFGH012345677654321";
69 static u8 ReturnString[XUARTPS_TOTAL_BYTES];
71 /************************** Function Prototypes ******************************/
74 /****************************************************************************/
77 * This function runs a self-test on the driver and hardware device. This self
78 * test performs a local loopback and verifies data can be sent and received.
80 * The time for this test is proportional to the baud rate that has been set
81 * prior to calling this function.
83 * The mode and control registers are restored before return.
85 * @param InstancePtr is a pointer to the XUartPs instance
88 * - XST_SUCCESS if the test was successful
89 * - XST_UART_TEST_FAIL if the test failed looping back the data
93 * This function can hang if the hardware is not functioning properly.
95 ******************************************************************************/
96 int XUartPs_SelfTest(XUartPs *InstancePtr)
98 int Status = XST_SUCCESS;
104 * Assert validates the input arguments
106 Xil_AssertNonvoid(InstancePtr != NULL);
107 Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
110 * Disable all interrupts in the interrupt disable register
112 IntrRegister = XUartPs_ReadReg(InstancePtr->Config.BaseAddress,
114 XUartPs_WriteReg(InstancePtr->Config.BaseAddress, XUARTPS_IDR_OFFSET,
118 * Setup for local loopback
120 ModeRegister = XUartPs_ReadReg(InstancePtr->Config.BaseAddress,
122 XUartPs_WriteReg(InstancePtr->Config.BaseAddress, XUARTPS_MR_OFFSET,
123 ((ModeRegister & (~XUARTPS_MR_CHMODE_MASK)) |
124 XUARTPS_MR_CHMODE_L_LOOP));
127 * Send a number of bytes and receive them, one at a time.
129 for (Index = 0; Index < XUARTPS_TOTAL_BYTES; Index++) {
131 * Send out the byte and if it was not sent then the failure
132 * will be caught in the comparison at the end
134 XUartPs_Send(InstancePtr, &TestString[Index], 1);
137 * Wait until the byte is received. This can hang if the HW
138 * is broken. Watch for the FIFO empty flag to be false.
140 while (!(XUartPs_IsReceiveData(InstancePtr->Config.
146 XUartPs_Recv(InstancePtr, &ReturnString[Index], 1);
150 * Compare the bytes received to the bytes sent to verify the exact data
153 for (Index = 0; Index < XUARTPS_TOTAL_BYTES; Index++) {
154 if (TestString[Index] != ReturnString[Index]) {
155 Status = XST_UART_TEST_FAIL;
160 * Restore the registers which were altered to put into polling and
161 * loopback modes so that this test is not destructive
163 XUartPs_WriteReg(InstancePtr->Config.BaseAddress, XUARTPS_IER_OFFSET,
165 XUartPs_WriteReg(InstancePtr->Config.BaseAddress, XUARTPS_MR_OFFSET,