127 lines
4.0 KiB
C
127 lines
4.0 KiB
C
/****************************************************************************
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* canutils/libobd2/obd2.c
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*
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* Copyright (C) 2017 Alan Carvalho de Assis. All rights reserved.
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* Author: Alan Carvalho de Assis <acassis@gmail.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/ioctl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <nuttx/can/can.h>
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#include "canutils/obd.h"
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#include "canutils/obd_pid.h"
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#include "canutils/obd_frame.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: obd_init
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*
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* Description:
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* Initialize the OBD-II with initial baudrate
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*
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* Returns a obd_dev_s with initial values or NULL if error.
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*
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****************************************************************************/
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struct obd_dev_s *obd_init(char *devfile, int baudate, int mode)
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{
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struct obd_dev_s *dev;
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int ret;
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/* Alloc memory for this device */
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dev = malloc(sizeof(struct obd_dev_s));
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if (!dev)
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{
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printf("ERROR: Failed to alloc memory for obd_dev!\n");
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return NULL;
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}
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/* Open the CAN device for reading/writing */
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dev->can_fd = open(devfile, O_RDWR);
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if (dev->can_fd < 0)
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{
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printf("ERROR: open %s failed: %d\n", devfile, errno);
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return NULL;
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}
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/* Show bit timing information if provided by the driver. Not all CAN
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* drivers will support this IOCTL.
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*/
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ret = ioctl(dev->can_fd, CANIOC_GET_BITTIMING,
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(unsigned long)((uintptr_t)&dev->can_bt));
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if (ret < 0)
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{
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printf("Bit timing not available: %d\n", errno);
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return NULL;
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}
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else
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{
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printf("Bit timing:\n");
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printf(" Baud: %lu\n", (unsigned long)dev->can_bt.bt_baud);
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printf(" TSEG1: %u\n", dev->can_bt.bt_tseg1);
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printf(" TSEG2: %u\n", dev->can_bt.bt_tseg2);
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printf(" SJW: %u\n", dev->can_bt.bt_sjw);
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}
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/* FIXME: Setup the baudrate */
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/* Setup the initial mode */
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if (mode != CAN_STD && mode != CAN_EXT)
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{
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printf("ERROR: Invalid mode, it needs to be CAN_STD or CAN_EXT!\n");
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return NULL;
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}
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dev->can_mode = mode;
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printf("OBD-II device initialized!\n");
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return dev;
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}
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