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32 /*****************************************************************************/
35 * @file xcanps_selftest.c
36 * @addtogroup canps_v3_0
39 * This file contains a diagnostic self-test function for the XCanPs driver.
41 * Read xcanps.h file for more information.
44 * The Baud Rate Prescaler Register (BRPR) and Bit Timing Register(BTR)
45 * are setup such that CAN baud rate equals 40Kbps, given the CAN clock
46 * equal to 24MHz. These need to be changed based on the desired baudrate
47 * and CAN clock frequency.
50 * MODIFICATION HISTORY:
52 * Ver Who Date Changes
53 * ----- ----- -------- -----------------------------------------------
54 * 1.00a xd/sv 01/12/10 First release
55 * 2.1 adk 23/08/14 Fixed CR:798792 Peripheral test for CANPS IP in
56 * SDK claims a 40kbps baud rate but it's not.
57 * 3.00 kvn 02/13/15 Modified code for MISRA_C:2012 compliance.
60 *****************************************************************************/
62 /***************************** Include Files ********************************/
67 /************************** Constant Definitions ****************************/
69 #define XCANPS_MAX_FRAME_SIZE_IN_WORDS ((XCANPS_MAX_FRAME_SIZE) / (sizeof(u32)))
71 #define FRAME_DATA_LENGTH 8U /* Frame Data field length */
73 /**************************** Type Definitions ******************************/
75 /***************** Macros (Inline Functions) Definitions ********************/
77 /************************** Variable Definitions ****************************/
80 * Buffers to hold frames to send and receive. These are declared as global so
81 * that they are not on the stack.
83 static u32 TxFrame[XCANPS_MAX_FRAME_SIZE_IN_WORDS];
84 static u32 RxFrame[XCANPS_MAX_FRAME_SIZE_IN_WORDS];
86 /************************** Function Prototypes *****************************/
88 /*****************************************************************************/
91 * This function runs a self-test on the CAN driver/device. The test resets
92 * the device, sets up the Loop Back mode, sends a standard frame, receives the
93 * frame, verifies the contents, and resets the device again.
95 * Note that this is a destructive test in that resets of the device are
96 * performed. Refer the device specification for the device status after
97 * the reset operation.
100 * @param InstancePtr is a pointer to the XCanPs instance.
103 * - XST_SUCCESS if the self-test passed. i.e., the frame
104 * received via the internal loop back has the same contents as
106 * - XST_FAILURE Otherwise.
110 * If the CAN device does not work properly, this function may enter an
111 * infinite loop and will never return to the caller.
113 * If XST_FAILURE is returned, the device is not reset so that the caller could
114 * have a chance to check reason(s) causing the failure.
116 ******************************************************************************/
117 s32 XCanPs_SelfTest(XCanPs *InstancePtr)
125 Xil_AssertNonvoid(InstancePtr != NULL);
126 Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
128 XCanPs_Reset(InstancePtr);
131 * The device should enter Configuration Mode immediately after
132 * reset above is finished. Now check the mode and return error code if
133 * it is not Configuration Mode.
135 if (XCanPs_GetMode(InstancePtr) != XCANPS_MODE_CONFIG) {
136 Status = XST_FAILURE;
141 * Setup Baud Rate Prescaler Register (BRPR) and Bit Timing Register
142 * (BTR) such that CAN baud rate equals 40Kbps, given the CAN clock
143 * equal to 24MHz. For more information see the CAN 2.0A, CAN 2.0B,
144 * ISO 11898-1 specifications.
146 (void)XCanPs_SetBaudRatePrescaler(InstancePtr, (u8)29U);
147 (void)XCanPs_SetBitTiming(InstancePtr, (u8)3U, (u8)2U, (u8)15U);
150 * Enter the loop back mode.
152 XCanPs_EnterMode(InstancePtr, XCANPS_MODE_LOOPBACK);
153 GetModeResult = XCanPs_GetMode(InstancePtr);
154 while (GetModeResult != ((u8)XCANPS_MODE_LOOPBACK)) {
155 GetModeResult = XCanPs_GetMode(InstancePtr);
159 * Create a frame to send with known values so we can verify them
162 TxFrame[0] = (u32)XCanPs_CreateIdValue((u32)2000U, (u32)0U, (u32)0U, (u32)0U, (u32)0U);
163 TxFrame[1] = (u32)XCanPs_CreateDlcValue((u32)8U);
165 FramePtr = (u8 *)((void *)(&TxFrame[2]));
166 for (Index = 0U; Index < 8U; Index++) {
167 if(*FramePtr != 0U) {
168 *FramePtr = (u8)Index;
176 Status = XCanPs_Send(InstancePtr, TxFrame);
177 if (Status != (s32)XST_SUCCESS) {
178 Status = XST_FAILURE;
183 * Wait until the frame arrives RX FIFO via internal loop back.
185 RxEmptyResult = XCanPs_ReadReg(((InstancePtr)->CanConfig.BaseAddr),
186 XCANPS_ISR_OFFSET) & XCANPS_IXR_RXNEMP_MASK;
188 while (RxEmptyResult == (u32)0U) {
189 RxEmptyResult = XCanPs_ReadReg(((InstancePtr)->CanConfig.BaseAddr),
190 XCANPS_ISR_OFFSET) & XCANPS_IXR_RXNEMP_MASK;
196 Status = XCanPs_Recv(InstancePtr, RxFrame);
197 if (Status != (s32)XST_SUCCESS) {
198 Status = XST_FAILURE;
203 * Verify Identifier and Data Length Code.
206 (u32)XCanPs_CreateIdValue((u32)2000U, (u32)0U, (u32)0U, (u32)0U, (u32)0U)) {
207 Status = XST_FAILURE;
211 if ((RxFrame[1] & ~XCANPS_DLCR_TIMESTAMP_MASK) != TxFrame[1]) {
212 Status = XST_FAILURE;
217 for (Index = 2U; Index < (XCANPS_MAX_FRAME_SIZE_IN_WORDS); Index++) {
218 if (RxFrame[Index] != TxFrame[Index]) {
219 Status = XST_FAILURE;
225 * Reset device again before returning to the caller.
227 XCanPs_Reset(InstancePtr);
229 Status = XST_SUCCESS;