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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 01/13/10 First Release
45 * 3.00 kvn 02/13/15 Modified code for MISRA-C:2012 compliance.
48 ******************************************************************************/
50 /***************************** Include Files *********************************/
55 /************************** Constant Definitions *****************************/
58 /**************************** Type Definitions *******************************/
61 /***************** Macros (Inline Functions) Definitions *********************/
63 #define XUARTPS_TOTAL_BYTES (u8)32
65 /************************** Variable Definitions *****************************/
67 static u8 TestString[XUARTPS_TOTAL_BYTES]="abcdefghABCDEFGH012345677654321";
68 static u8 ReturnString[XUARTPS_TOTAL_BYTES];
70 /************************** Function Prototypes ******************************/
73 /****************************************************************************/
76 * This function runs a self-test on the driver and hardware device. This self
77 * test performs a local loopback and verifies data can be sent and received.
79 * The time for this test is proportional to the baud rate that has been set
80 * prior to calling this function.
82 * The mode and control registers are restored before return.
84 * @param InstancePtr is a pointer to the XUartPs instance
87 * - XST_SUCCESS if the test was successful
88 * - XST_UART_TEST_FAIL if the test failed looping back the data
92 * This function can hang if the hardware is not functioning properly.
94 ******************************************************************************/
95 s32 XUartPs_SelfTest(XUartPs *InstancePtr)
97 s32 Status = XST_SUCCESS;
101 u32 ReceiveDataResult;
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 & (u32)(~XUARTPS_MR_CHMODE_MASK)) |
124 (u32)XUARTPS_MR_CHMODE_L_LOOP));
127 * Send a number of bytes and receive them, one at a time.
129 for (Index = 0U; 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 (void)XUartPs_Send(InstancePtr, &TestString[Index], 1U);
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 ReceiveDataResult = Xil_In32((InstancePtr->Config.BaseAddress) + XUARTPS_SR_OFFSET) &
142 while (ReceiveDataResult == XUARTPS_SR_RXEMPTY ) {
143 ReceiveDataResult = Xil_In32((InstancePtr->Config.BaseAddress) + XUARTPS_SR_OFFSET) &
150 (void)XUartPs_Recv(InstancePtr, &ReturnString[Index], 1U);
154 * Compare the bytes received to the bytes sent to verify the exact data
157 for (Index = 0U; Index < XUARTPS_TOTAL_BYTES; Index++) {
158 if (TestString[Index] != ReturnString[Index]) {
159 Status = XST_UART_TEST_FAIL;
164 * Restore the registers which were altered to put into polling and
165 * loopback modes so that this test is not destructive
167 XUartPs_WriteReg(InstancePtr->Config.BaseAddress, XUARTPS_IER_OFFSET,
169 XUartPs_WriteReg(InstancePtr->Config.BaseAddress, XUARTPS_MR_OFFSET,