1 /******************************************************************************
3 * Copyright (C) 2010 - 2014 Xilinx, Inc. All rights reserved.
5 * Permission is hereby granted, free of charge, to any person obtaining a copy
6 * of this software and associated documentation files (the "Software"), to deal
7 * in the Software without restriction, including without limitation the rights
8 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9 * copies of the Software, and to permit persons to whom the Software is
10 * furnished to do so, subject to the following conditions:
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
15 * Use of the Software is limited solely to applications:
16 * (a) running on a Xilinx device, or
17 * (b) that interact with a Xilinx device through a bus or interconnect.
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * XILINX BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
23 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
24 * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
27 * Except as contained in this notice, the name of the Xilinx shall not be used
28 * in advertising or otherwise to promote the sale, use or other dealings in
29 * this Software without prior written authorization from Xilinx.
31 ******************************************************************************/
32 /*****************************************************************************/
35 * @file xcanps_selftest.c
36 * @addtogroup canps_v2_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
57 *****************************************************************************/
59 /***************************** Include Files ********************************/
64 /************************** Constant Definitions ****************************/
66 #define XCANPS_MAX_FRAME_SIZE_IN_WORDS (XCANPS_MAX_FRAME_SIZE / sizeof(u32))
68 #define FRAME_DATA_LENGTH 8 /* Frame Data field length */
70 /**************************** Type Definitions ******************************/
72 /***************** Macros (Inline Functions) Definitions ********************/
74 /************************** Variable Definitions ****************************/
77 * Buffers to hold frames to send and receive. These are declared as global so
78 * that they are not on the stack.
80 static u32 TxFrame[XCANPS_MAX_FRAME_SIZE_IN_WORDS];
81 static u32 RxFrame[XCANPS_MAX_FRAME_SIZE_IN_WORDS];
83 /************************** Function Prototypes *****************************/
85 /*****************************************************************************/
88 * This function runs a self-test on the CAN driver/device. The test resets
89 * the device, sets up the Loop Back mode, sends a standard frame, receives the
90 * frame, verifies the contents, and resets the device again.
92 * Note that this is a destructive test in that resets of the device are
93 * performed. Refer the device specification for the device status after
94 * the reset operation.
97 * @param InstancePtr is a pointer to the XCanPs instance.
100 * - XST_SUCCESS if the self-test passed. i.e., the frame
101 * received via the internal loop back has the same contents as
103 * - XST_FAILURE Otherwise.
107 * If the CAN device does not work properly, this function may enter an
108 * infinite loop and will never return to the caller.
110 * If XST_FAILURE is returned, the device is not reset so that the caller could
111 * have a chance to check reason(s) causing the failure.
113 ******************************************************************************/
114 int XCanPs_SelfTest(XCanPs *InstancePtr)
120 Xil_AssertNonvoid(InstancePtr != NULL);
121 Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
123 XCanPs_Reset(InstancePtr);
126 * The device should enter Configuration Mode immediately after
127 * reset above is finished. Now check the mode and return error code if
128 * it is not Configuration Mode.
130 if (XCanPs_GetMode(InstancePtr) != XCANPS_MODE_CONFIG) {
135 * Setup Baud Rate Prescaler Register (BRPR) and Bit Timing Register
136 * (BTR) such that CAN baud rate equals 40Kbps, given the CAN clock
137 * equal to 24MHz. For more information see the CAN 2.0A, CAN 2.0B,
138 * ISO 11898-1 specifications.
140 XCanPs_SetBaudRatePrescaler(InstancePtr, 1);
141 XCanPs_SetBitTiming(InstancePtr, 1, 3, 8);
144 * Enter the loop back mode.
146 XCanPs_EnterMode(InstancePtr, XCANPS_MODE_LOOPBACK);
147 while (XCanPs_GetMode(InstancePtr) != XCANPS_MODE_LOOPBACK);
150 * Create a frame to send with known values so we can verify them
153 TxFrame[0] = (u32)XCanPs_CreateIdValue((u32)2000, 0, 0, 0, 0);
154 TxFrame[1] = (u32)XCanPs_CreateDlcValue((u32)8);
156 FramePtr = (u8 *) (&TxFrame[2]);
157 for (Index = 0; Index < 8; Index++) {
158 *FramePtr++ = (u8) Index;
164 Status = XCanPs_Send(InstancePtr, TxFrame);
165 if (Status != XST_SUCCESS) {
170 * Wait until the frame arrives RX FIFO via internal loop back.
172 while (XCanPs_IsRxEmpty(InstancePtr) == TRUE);
177 Status = XCanPs_Recv(InstancePtr, RxFrame);
178 if (Status != XST_SUCCESS) {
183 * Verify Identifier and Data Length Code.
186 (u32)XCanPs_CreateIdValue((u32)2000, 0, 0, 0, 0)) {
190 if ((RxFrame[1] & ~XCANPS_DLCR_TIMESTAMP_MASK) != TxFrame[1]) {
195 for (Index = 2; Index < XCANPS_MAX_FRAME_SIZE_IN_WORDS; Index++) {
196 if (RxFrame[Index] != TxFrame[Index]) {
202 * Reset device again before returning to the caller.
204 XCanPs_Reset(InstancePtr);