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.
19 * A representation of an OBD-II PID.
21 * pid - The 1 byte PID.
22 * name - A human readable name to use for this PID when published.
23 * frequency - The frequency to request this PID if supported by the vehicle
24 * when automatic, recurring OBD-II requests are enabled.
40 const char *UNIT_NAMES[10] = {
53 typedef struct _Obd2Pid {
63 { pid: 0x4, name: "engine.load", frequency: 5 },
64 { pid: 0x5, name: "engine.coolant.temperature", frequency: 1 },
65 { pid: 0xa, name: "fuel.pressure", frequency: 1 },
66 { pid: 0xb, name: "intake.manifold.pressure", frequency: 1 },
67 { pid: 0xc, name: "engine.speed", frequency: 5 },
68 { pid: 0xd, name: "vehicle.speed", frequency: 5 },
69 { pid: 0xf, name: "intake.air.temperature", frequency: 1 },
70 { pid: 0x10, name: "mass.airflow", frequency: 5 },
71 { pid: 0x11, name: "throttle.position", frequency: 5 },
72 { pid: 0x1f, name: "running.time", frequency: 1 },
73 { pid: 0x27, name: "fuel.level", frequency: 1 },
74 { pid: 0x33, name: "barometric.pressure", frequency: 1 },
75 { pid: 0x4c, name: "commanded.throttle.position", frequency: 1 },
76 { pid: 0x52, name: "ethanol.fuel.percentage", frequency: 1 },
77 { pid: 0x5a, name: "accelerator.pedal.position", frequency: 5 },
78 { pid: 0x5c, name: "engine.oil.temperature", frequency: 1 },
79 { pid: 0x63, name: "engine.torque", frequency: 1 },
83 /* Public: Check if a request is an OBD-II PID request.
85 * Returns true if the request is a mode 1 request and it has a 1 byte PID.
87 bool isObd2Request(DiagnosticRequest* request);
89 /* Public: Decode the payload of an OBD-II PID.
91 * This function matches the type signature for a DiagnosticResponseDecoder, so
92 * it can be used as the decoder for a DiagnosticRequest. It returns the decoded
93 * value of the PID, using the standard formulas (see
94 * http://en.wikipedia.org/wiki/OBD-II_PIDs#Mode_01).
96 float handleObd2Pid(const DiagnosticResponse* response, float parsedPayload);
99 * Object to handle obd2 session with pre-scan of supported pid
100 * then request them regularly
102 class Obd2Handler_c {
105 * Pre-defined OBD-II PIDs to query for if supported by the vehicle.
107 const Obd2Pid OBD2_PIDS[] = {
108 { pid: 0x4, name: "obd2.engine.load", min:0, max: 100, unit: POURCENT, frequency: 5 },
109 { pid: 0x5, name: "obd2.engine.coolant.temperature", min: -40, max: 215, unit: DEGREES_CELSIUS, frequency: 1 },
110 { pid: 0xa, name: "obd2.fuel.pressure", min: 0, max: 765, unit: KPA, frequency: 1 },
111 { pid: 0xb, name: "obd2.intake.manifold.pressure", min: 0, max: 255, unit: KPA, frequency: 1 },
112 { pid: 0xc, name: "obd2.engine.speed", min: 0, max: 16383, unit: RPM, frequency: 5 },
113 { pid: 0xd, name: "obd2.vehicle.speed", min: 0, max: 255, unit: KM_H, frequency: 5 },
114 { pid: 0xf, name: "obd2.intake.air.temperature", min: -40, max:215, unit: DEGREES_CELSIUS, frequency: 1 },
115 { pid: 0x10, name: "obd2.mass.airflow", min: 0, max: 655, unit: GRAMS_SEC, frequency: 5 },
116 { pid: 0x11, name: "obd2.throttle.position", min: 0, max: 100, unit: POURCENT, frequency: 5 },
117 { pid: 0x1f, name: "obd2.running.time", min: 0, max: 65535, unit: SECONDS, frequency: 1 },
118 { pid: 0x2d, name: "obd2.EGR.error", min: -100, max: 99, unit: POURCENT, frequency: 0 },
119 { pid: 0x2f, name: "obd2.fuel.level", min: 0, max: 100, unit: POURCENT, frequency: 1 },
120 { pid: 0x33, name: "obd2.barometric.pressure", min: 0, max: 255, unit: KPA, frequency: 1 },
121 { pid: 0x4c, name: "obd2.commanded.throttle.position", min: 0, max: 100, unit: POURCENT, frequency: 1 },
122 { pid: 0x52, name: "obd2.ethanol.fuel.percentage", min: 0, max: 100, unit: POURCENT, frequency: 1 },
123 { pid: 0x5a, name: "obd2.accelerator.pedal.position", min: 0, max: 100, unit: POURCENT, frequency: 5 },
124 { pid: 0x5b, name: "obd2.hybrid.battery-pack.remaining.life", min: 0, max: 100, unit: POURCENT, frequency: 5 },
125 { pid: 0x5c, name: "obd2.engine.oil.temperature",min: -40, max: 210, unit: DEGREES_CELSIUS, frequency: 1 },
126 { pid: 0x63, name: "obd2.engine.torque", min: 0, max: 65535, unit: NM, frequency: 1 },
130 * Will be populated with constructor
132 Obd2Pid supported_pids[];
137 bool isObd2Request(request);