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32 /*****************************************************************************/
35 * @file xcanps_selftest.c
37 * This file contains a diagnostic self-test function for the XCanPs driver.
39 * Read xcanps.h file for more information.
42 * The Baud Rate Prescaler Register (BRPR) and Bit Timing Register(BTR)
43 * are setup such that CAN baud rate equals 40Kbps, given the CAN clock
44 * equal to 24MHz. These need to be changed based on the desired baudrate
45 * and CAN clock frequency.
48 * MODIFICATION HISTORY:
50 * Ver Who Date Changes
51 * ----- ----- -------- -----------------------------------------------
52 * 1.00a xd/sv 01/12/10 First release
55 *****************************************************************************/
57 /***************************** Include Files ********************************/
62 /************************** Constant Definitions ****************************/
64 #define XCANPS_MAX_FRAME_SIZE_IN_WORDS (XCANPS_MAX_FRAME_SIZE / sizeof(u32))
66 #define FRAME_DATA_LENGTH 8 /* Frame Data field length */
68 /**************************** Type Definitions ******************************/
70 /***************** Macros (Inline Functions) Definitions ********************/
72 /************************** Variable Definitions ****************************/
75 * Buffers to hold frames to send and receive. These are declared as global so
76 * that they are not on the stack.
78 static u32 TxFrame[XCANPS_MAX_FRAME_SIZE_IN_WORDS];
79 static u32 RxFrame[XCANPS_MAX_FRAME_SIZE_IN_WORDS];
81 /************************** Function Prototypes *****************************/
83 /*****************************************************************************/
86 * This function runs a self-test on the CAN driver/device. The test resets
87 * the device, sets up the Loop Back mode, sends a standard frame, receives the
88 * frame, verifies the contents, and resets the device again.
90 * Note that this is a destructive test in that resets of the device are
91 * performed. Refer the device specification for the device status after
92 * the reset operation.
95 * @param InstancePtr is a pointer to the XCanPs instance.
98 * - XST_SUCCESS if the self-test passed. i.e., the frame
99 * received via the internal loop back has the same contents as
101 * - XST_FAILURE Otherwise.
105 * If the CAN device does not work properly, this function may enter an
106 * infinite loop and will never return to the caller.
108 * If XST_FAILURE is returned, the device is not reset so that the caller could
109 * have a chance to check reason(s) causing the failure.
111 ******************************************************************************/
112 int XCanPs_SelfTest(XCanPs *InstancePtr)
118 Xil_AssertNonvoid(InstancePtr != NULL);
119 Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
121 XCanPs_Reset(InstancePtr);
124 * The device should enter Configuration Mode immediately after
125 * reset above is finished. Now check the mode and return error code if
126 * it is not Configuration Mode.
128 if (XCanPs_GetMode(InstancePtr) != XCANPS_MODE_CONFIG) {
133 * Setup Baud Rate Prescaler Register (BRPR) and Bit Timing Register
134 * (BTR) such that CAN baud rate equals 40Kbps, given the CAN clock
135 * equal to 24MHz. For more information see the CAN 2.0A, CAN 2.0B,
136 * ISO 11898-1 specifications.
138 XCanPs_SetBaudRatePrescaler(InstancePtr, 1);
139 XCanPs_SetBitTiming(InstancePtr, 1, 3, 8);
142 * Enter the loop back mode.
144 XCanPs_EnterMode(InstancePtr, XCANPS_MODE_LOOPBACK);
145 while (XCanPs_GetMode(InstancePtr) != XCANPS_MODE_LOOPBACK);
148 * Create a frame to send with known values so we can verify them
151 TxFrame[0] = (u32)XCanPs_CreateIdValue((u32)2000, 0, 0, 0, 0);
152 TxFrame[1] = (u32)XCanPs_CreateDlcValue((u32)8);
154 FramePtr = (u8 *) (&TxFrame[2]);
155 for (Index = 0; Index < 8; Index++) {
156 *FramePtr++ = (u8) Index;
162 Status = XCanPs_Send(InstancePtr, TxFrame);
163 if (Status != XST_SUCCESS) {
168 * Wait until the frame arrives RX FIFO via internal loop back.
170 while (XCanPs_IsRxEmpty(InstancePtr) == TRUE);
175 Status = XCanPs_Recv(InstancePtr, RxFrame);
176 if (Status != XST_SUCCESS) {
181 * Verify Identifier and Data Length Code.
184 (u32)XCanPs_CreateIdValue((u32)2000, 0, 0, 0, 0)) {
188 if ((RxFrame[1] & ~XCANPS_DLCR_TIMESTAMP_MASK) != TxFrame[1]) {
193 for (Index = 2; Index < XCANPS_MAX_FRAME_SIZE_IN_WORDS; Index++) {
194 if (RxFrame[Index] != TxFrame[Index]) {
200 * Reset device again before returning to the caller.
202 XCanPs_Reset(InstancePtr);