136 lines
4.5 KiB
C
136 lines
4.5 KiB
C
/****************************************************************************
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* canutils/libobd2/obd_decodepid.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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* Pre-processor Definitions
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****************************************************************************/
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#define MAXDATA 16
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static char g_data[MAXDATA];
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: obd_decode_pid
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*
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* Description:
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* Decode the value returned for a determined PID.
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*
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* It will return the data decode as text string or NULL if error.
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*
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****************************************************************************/
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FAR char *obd_decode_pid(FAR struct obd_dev_s *dev, uint8_t pid)
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{
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uint32_t pids;
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int rpm;
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/* Verify if received data is valid */
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if (dev->data[2] != pid)
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{
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printf("Expecting PID %02x but received %02x!\n", pid, dev->data[2]);
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return NULL;
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}
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switch (dev->data[2])
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{
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case OBD_PID_SUPPORTED:
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pids = (dev->data[3] << 24) | (dev->data[4] << 16) | \
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(dev->data[5] << 8) | dev->data[6];
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snprintf(g_data, MAXDATA, "%08X", pids);
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#ifdef CONFIG_DEBUG_INFO
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printf("Supported PIDs: %08X\n");
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#endif
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break;
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case OBD_PID_ENGINE_TEMPERATURE:
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snprintf(g_data, MAXDATA, "%d", dev->data[3] - 40);
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#ifdef CONFIG_DEBUG_INFO
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printf("Engine Temperature = %d\n", dev->data[3] - 40);
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#endif
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break;
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case OBD_PID_RPM:
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rpm = ((256 * dev->data[3]) + dev->data[4])/4;
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snprintf(g_data, MAXDATA, "%d", rpm);
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#ifdef CONFIG_DEBUG_INFO
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printf("RPM = %d\n", rpm);
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#endif
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break;
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case OBD_PID_SPEED:
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snprintf(g_data, MAXDATA, "%d", dev->data[3]);
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#ifdef CONFIG_DEBUG_INFO
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printf("SPEED = %d Km/h\n", dev->data[3]);
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#endif
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break;
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case OBD_PID_THROTTLE_POSITION:
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snprintf(g_data, MAXDATA, "%d", (100 * dev->data[3])/255);
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#ifdef CONFIG_DEBUG_INFO
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printf("Throttle position = %d\% \n", (100 * dev->data[3])/255);
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#endif
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break;
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}
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return g_data;
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}
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