2 * Copyright (C) 2015, 2016 "IoT.bzh"
3 * Author "Romain Forlot" <romain.forlot@iot.bzh>
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
22 #include "can-bus.hpp"
26 #include <afb/afb-binding.h>
42 const char *UNIT_NAMES[10] = {
56 * @brief A representation of an OBD-II PID.
58 * pid - The 1 byte PID.
59 * name - A human readable name to use for this PID when published.
60 * min - minimum value for this pid
61 * max - maximum value for this pid
63 * frequency - The frequency to request this PID if supported by the vehicle
64 * when automatic, recurring OBD-II requests are enabled.
65 * supported - is it supported by the vehicle. Initialized after scan
66 * event - application framework event handler.
68 typedef struct _Obd2Pid {
76 struct afb_event event;
80 * Pre-defined OBD-II PIDs to query for if supported by the vehicle.
82 const std::vector<Obd2Pid> OBD2_PIDS {
83 { pid: 0x04, name: "obd2.engine.load", min:0, max: 100, unit: POURCENT, frequency: 5, supported: false, event: {nullptr, nullptr} },
84 { pid: 0x05, name: "obd2.engine.coolant.temperature", min: -40, max: 215, unit: DEGREES_CELSIUS, frequency: 1, supported: false, event: {nullptr, nullptr} },
85 { pid: 0x0a, name: "obd2.fuel.pressure", min: 0, max: 765, unit: KPA, frequency: 1, supported: false, event: {nullptr, nullptr} },
86 { pid: 0x0b, name: "obd2.intake.manifold.pressure", min: 0, max: 255, unit: KPA, frequency: 1, supported: false, event: {nullptr, nullptr} },
87 { pid: 0x0c, name: "obd2.engine.speed", min: 0, max: 16383, unit: RPM, frequency: 5, supported: false, event: {nullptr, nullptr} },
88 { pid: 0x0d, name: "obd2.vehicle.speed", min: 0, max: 255, unit: KM_H, frequency: 5, supported: false, event: {nullptr, nullptr} },
89 { pid: 0x0f, name: "obd2.intake.air.temperature", min: -40, max:215, unit: DEGREES_CELSIUS, frequency: 1, supported: false, event: {nullptr, nullptr} },
90 { pid: 0x10, name: "obd2.mass.airflow", min: 0, max: 655, unit: GRAMS_SEC, frequency: 5, supported: false, event: {nullptr, nullptr} },
91 { pid: 0x11, name: "obd2.throttle.position", min: 0, max: 100, unit: POURCENT, frequency: 5, supported: false, event: {nullptr, nullptr} },
92 { pid: 0x1f, name: "obd2.running.time", min: 0, max: 65535, unit: SECONDS, frequency: 1, supported: false, event: {nullptr, nullptr} },
93 { pid: 0x2d, name: "obd2.EGR.error", min: -100, max: 99, unit: POURCENT, frequency: 0, supported: false, event: {nullptr, nullptr} },
94 { pid: 0x2f, name: "obd2.fuel.level", min: 0, max: 100, unit: POURCENT, frequency: 1, supported: false, event: {nullptr, nullptr} },
95 { pid: 0x33, name: "obd2.barometric.pressure", min: 0, max: 255, unit: KPA, frequency: 1, supported: false, event: {nullptr, nullptr} },
96 { pid: 0x4c, name: "obd2.commanded.throttle.position", min: 0, max: 100, unit: POURCENT, frequency: 1, supported: false, event: {nullptr, nullptr} },
97 { pid: 0x52, name: "obd2.ethanol.fuel.percentage", min: 0, max: 100, unit: POURCENT, frequency: 1, supported: false, event: {nullptr, nullptr} },
98 { pid: 0x5a, name: "obd2.accelerator.pedal.position", min: 0, max: 100, unit: POURCENT, frequency: 5, supported: false, event: {nullptr, nullptr} },
99 { pid: 0x5b, name: "obd2.hybrid.battery-pack.remaining.life", min: 0, max: 100, unit: POURCENT, frequency: 5, supported: false, event: {nullptr, nullptr} },
100 { pid: 0x5c, name: "obd2.engine.oil.temperature",min: -40, max: 210, unit: DEGREES_CELSIUS, frequency: 1, supported: false, event: {nullptr, nullptr} },
101 { pid: 0x63, name: "obd2.engine.torque", min: 0, max: 65535, unit: NM, frequency: 1, supported: false, event: {nullptr, nullptr} }
105 * @brief - Object to handle obd2 session with pre-scan of supported pid
106 * then request them regularly
108 class obd2_handler_t {
117 void find_obd2_pid(const char *name, std::vector<Obd2Pid> *pids);
120 * @brief Check if a request is an OBD-II PID request.
122 * @return true if the request is a mode 1 request and it has a 1 byte PID.
124 bool is_obd2_request(DiagnosticRequest *request);
127 * @brief Check if requested signal name is an obd2 pid
129 * @return true if name began with ob2.* else false.
131 bool is_obd2_signal(const char *name);
134 * @brief Decode the payload of an OBD-II PID.
136 * This function matches the type signature for a DiagnosticResponseDecoder, so
137 * it can be used as the decoder for a DiagnosticRequest. It returns the decoded
138 * value of the PID, using the standard formulas (see
139 * http://en.wikipedia.org/wiki/OBD-II_PIDs#Mode_01).
141 * @param[in] DiagnosticResponse response - the received DiagnosticResponse (the data is in response.payload,
142 * a byte array). This is most often used when the byte order is
143 * signiticant, i.e. with many OBD-II PID formulas.
144 * @param[in] float parsed_payload - the entire payload of the response parsed as an int.
146 float handle_obd2_pid(const DiagnosticResponse* response, float parsedPayload);