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32 /****************************************************************************/
35 * @file xuartps_selftest.c
36 * @addtogroup uartps_v3_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 01/13/10 First Release
47 * 3.00 kvn 02/13/15 Modified code for MISRA-C:2012 compliance.
50 ******************************************************************************/
52 /***************************** Include Files *********************************/
57 /************************** Constant Definitions *****************************/
60 /**************************** Type Definitions *******************************/
63 /***************** Macros (Inline Functions) Definitions *********************/
65 #define XUARTPS_TOTAL_BYTES (u8)32
67 /************************** Variable Definitions *****************************/
69 static u8 TestString[XUARTPS_TOTAL_BYTES]="abcdefghABCDEFGH012345677654321";
70 static u8 ReturnString[XUARTPS_TOTAL_BYTES];
72 /************************** Function Prototypes ******************************/
75 /****************************************************************************/
78 * This function runs a self-test on the driver and hardware device. This self
79 * test performs a local loopback and verifies data can be sent and received.
81 * The time for this test is proportional to the baud rate that has been set
82 * prior to calling this function.
84 * The mode and control registers are restored before return.
86 * @param InstancePtr is a pointer to the XUartPs instance
89 * - XST_SUCCESS if the test was successful
90 * - XST_UART_TEST_FAIL if the test failed looping back the data
94 * This function can hang if the hardware is not functioning properly.
96 ******************************************************************************/
97 s32 XUartPs_SelfTest(XUartPs *InstancePtr)
99 s32 Status = XST_SUCCESS;
103 u32 ReceiveDataResult;
105 /* Assert validates the input arguments */
106 Xil_AssertNonvoid(InstancePtr != NULL);
107 Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
109 /* Disable all interrupts in the interrupt disable register */
110 IntrRegister = XUartPs_ReadReg(InstancePtr->Config.BaseAddress,
112 XUartPs_WriteReg(InstancePtr->Config.BaseAddress, XUARTPS_IDR_OFFSET,
115 /* Setup for local loopback */
116 ModeRegister = XUartPs_ReadReg(InstancePtr->Config.BaseAddress,
118 XUartPs_WriteReg(InstancePtr->Config.BaseAddress, XUARTPS_MR_OFFSET,
119 ((ModeRegister & (u32)(~XUARTPS_MR_CHMODE_MASK)) |
120 (u32)XUARTPS_MR_CHMODE_L_LOOP));
122 /* Send a number of bytes and receive them, one at a time. */
123 for (Index = 0U; Index < XUARTPS_TOTAL_BYTES; Index++) {
125 * Send out the byte and if it was not sent then the failure
126 * will be caught in the comparison at the end
128 (void)XUartPs_Send(InstancePtr, &TestString[Index], 1U);
131 * Wait until the byte is received. This can hang if the HW
132 * is broken. Watch for the FIFO empty flag to be false.
134 ReceiveDataResult = Xil_In32((InstancePtr->Config.BaseAddress) + XUARTPS_SR_OFFSET) &
136 while (ReceiveDataResult == XUARTPS_SR_RXEMPTY ) {
137 ReceiveDataResult = Xil_In32((InstancePtr->Config.BaseAddress) + XUARTPS_SR_OFFSET) &
141 /* Receive the byte */
142 (void)XUartPs_Recv(InstancePtr, &ReturnString[Index], 1U);
146 * Compare the bytes received to the bytes sent to verify the exact data
149 for (Index = 0U; Index < XUARTPS_TOTAL_BYTES; Index++) {
150 if (TestString[Index] != ReturnString[Index]) {
151 Status = XST_UART_TEST_FAIL;
156 * Restore the registers which were altered to put into polling and
157 * loopback modes so that this test is not destructive
159 XUartPs_WriteReg(InstancePtr->Config.BaseAddress, XUARTPS_IER_OFFSET,
161 XUartPs_WriteReg(InstancePtr->Config.BaseAddress, XUARTPS_MR_OFFSET,