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44 * @file xuartps_selftest.c
46 * This file contains the self-test functions for the XUartPs driver.
49 * MODIFICATION HISTORY:
51 * Ver Who Date Changes
52 * ----- ------ -------- -----------------------------------------------
53 * 1.00 drg/jz 01/13/108First Release
56 ******************************************************************************/
58 /***************************** Include Files *********************************/
63 /************************** Constant Definitions *****************************/
66 /**************************** Type Definitions *******************************/
69 /***************** Macros (Inline Functions) Definitions *********************/
71 #define XUARTPS_TOTAL_BYTES 32
73 /************************** Variable Definitions *****************************/
75 static u8 TestString[XUARTPS_TOTAL_BYTES]="abcdefghABCDEFGH012345677654321";
76 static u8 ReturnString[XUARTPS_TOTAL_BYTES];
78 /************************** Function Prototypes ******************************/
81 /****************************************************************************/
84 * This function runs a self-test on the driver and hardware device. This self
85 * test performs a local loopback and verifies data can be sent and received.
87 * The time for this test is proportional to the baud rate that has been set
88 * prior to calling this function.
90 * The mode and control registers are restored before return.
92 * @param InstancePtr is a pointer to the XUartPs instance
95 * - XST_SUCCESS if the test was successful
96 * - XST_UART_TEST_FAIL if the test failed looping back the data
100 * This function can hang if the hardware is not functioning properly.
102 ******************************************************************************/
103 int XUartPs_SelfTest(XUartPs *InstancePtr)
105 int Status = XST_SUCCESS;
111 * Assert validates the input arguments
113 Xil_AssertNonvoid(InstancePtr != NULL);
114 Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
117 * Disable all interrupts in the interrupt disable register
119 IntrRegister = XUartPs_ReadReg(InstancePtr->Config.BaseAddress,
121 XUartPs_WriteReg(InstancePtr->Config.BaseAddress, XUARTPS_IDR_OFFSET,
125 * Setup for local loopback
127 ModeRegister = XUartPs_ReadReg(InstancePtr->Config.BaseAddress,
129 XUartPs_WriteReg(InstancePtr->Config.BaseAddress, XUARTPS_MR_OFFSET,
130 ((ModeRegister & (~XUARTPS_MR_CHMODE_MASK)) |
131 XUARTPS_MR_CHMODE_L_LOOP));
134 * Send a number of bytes and receive them, one at a time.
136 for (Index = 0; Index < XUARTPS_TOTAL_BYTES; Index++) {
138 * Send out the byte and if it was not sent then the failure
139 * will be caught in the comparison at the end
141 XUartPs_Send(InstancePtr, &TestString[Index], 1);
144 * Wait until the byte is received. This can hang if the HW
145 * is broken. Watch for the FIFO empty flag to be false.
147 while (!(XUartPs_IsReceiveData(InstancePtr->Config.
153 XUartPs_Recv(InstancePtr, &ReturnString[Index], 1);
157 * Compare the bytes received to the bytes sent to verify the exact data
160 for (Index = 0; Index < XUARTPS_TOTAL_BYTES; Index++) {
161 if (TestString[Index] != ReturnString[Index]) {
162 Status = XST_UART_TEST_FAIL;
167 * Restore the registers which were altered to put into polling and
168 * loopback modes so that this test is not destructive
170 XUartPs_WriteReg(InstancePtr->Config.BaseAddress, XUARTPS_IER_OFFSET,
172 XUartPs_WriteReg(InstancePtr->Config.BaseAddress, XUARTPS_MR_OFFSET,