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Diffstat (limited to 'src/obd2.h')
| -rw-r--r-- | src/obd2.h | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/src/obd2.h b/src/obd2.h new file mode 100644 index 00000000..862c04a2 --- /dev/null +++ b/src/obd2.h @@ -0,0 +1,150 @@ +/* + * Copyright (C) 2015, 2016 "IoT.bzh" + * Author "Romain Forlot" <romain.forlot@iot.bzh> + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +/* + * A representation of an OBD-II PID. + * + * pid - The 1 byte PID. + * name - A human readable name to use for this PID when published. + * frequency - The frequency to request this PID if supported by the vehicle + * when automatic, recurring OBD-II requests are enabled. + */ + +enum UNIT { + POURCENT, + DEGREES_CELSIUS, + KPA, + RPM, + GRAMS_SEC, + SECONDS, + KM, + KM_H, + PA, + NM +}; + +const char *UNIT_NAMES[10] = { + "POURCENT", + "DEGREES_CELSIUS", + "KPA", + "RPM", + "GRAMS_SEC", + "SECONDS", + "KM", + "KM_H", + "PA", + "NM" +}; + + +/* + * A representation of an OBD-II PID. + * + * pid - The 1 byte PID. + * name - A human readable name to use for this PID when published. + * min - minimum value for this pid + * max - maximum value for this pid + * unit - unit used + * frequency - The frequency to request this PID if supported by the vehicle + * when automatic, recurring OBD-II requests are enabled. + * supported - is it supported by the vehicle. Initialized after scan + * event - application framework event handler. + * + */ +typedef struct _Obd2Pid { + uint8_t pid; + const char* name; + const int min; + const int max; + enum UNIT unit; + int frequency; + bool supported; + struct afb_event event; +} Obd2Pid; + +/* + { pid: 0x4, name: "engine.load", frequency: 5 }, + { pid: 0x5, name: "engine.coolant.temperature", frequency: 1 }, + { pid: 0xa, name: "fuel.pressure", frequency: 1 }, + { pid: 0xb, name: "intake.manifold.pressure", frequency: 1 }, + { pid: 0xc, name: "engine.speed", frequency: 5 }, + { pid: 0xd, name: "vehicle.speed", frequency: 5 }, + { pid: 0xf, name: "intake.air.temperature", frequency: 1 }, + { pid: 0x10, name: "mass.airflow", frequency: 5 }, + { pid: 0x11, name: "throttle.position", frequency: 5 }, + { pid: 0x1f, name: "running.time", frequency: 1 }, + { pid: 0x27, name: "fuel.level", frequency: 1 }, + { pid: 0x33, name: "barometric.pressure", frequency: 1 }, + { pid: 0x4c, name: "commanded.throttle.position", frequency: 1 }, + { pid: 0x52, name: "ethanol.fuel.percentage", frequency: 1 }, + { pid: 0x5a, name: "accelerator.pedal.position", frequency: 5 }, + { pid: 0x5c, name: "engine.oil.temperature", frequency: 1 }, + { pid: 0x63, name: "engine.torque", frequency: 1 }, +}; + */ + +/* Public: Check if a request is an OBD-II PID request. + * + * Returns true if the request is a mode 1 request and it has a 1 byte PID. + */ +bool isObd2Request(DiagnosticRequest* request); + +/* Public: Decode the payload of an OBD-II PID. + * + * This function matches the type signature for a DiagnosticResponseDecoder, so + * it can be used as the decoder for a DiagnosticRequest. It returns the decoded + * value of the PID, using the standard formulas (see + * http://en.wikipedia.org/wiki/OBD-II_PIDs#Mode_01). + */ +float handleObd2Pid(const DiagnosticResponse* response, float parsedPayload); + +/* + * Object to handle obd2 session with pre-scan of supported pid + * then request them regularly + */ +class Obd2Handler_c { + private: + /* + * Pre-defined OBD-II PIDs to query for if supported by the vehicle. + */ + const Obd2Pid OBD2_PIDS[] = { + { pid: 0x04, name: "obd2.engine.load", min:0, max: 100, unit: POURCENT, frequency: 5, supported: false }, + { pid: 0x05, name: "obd2.engine.coolant.temperature", min: -40, max: 215, unit: DEGREES_CELSIUS, frequency: 1, supported: false }, + { pid: 0x0a, name: "obd2.fuel.pressure", min: 0, max: 765, unit: KPA, frequency: 1, supported: false }, + { pid: 0x0b, name: "obd2.intake.manifold.pressure", min: 0, max: 255, unit: KPA, frequency: 1, supported: false }, + { pid: 0x0c, name: "obd2.engine.speed", min: 0, max: 16383, unit: RPM, frequency: 5, supported: false }, + { pid: 0x0d, name: "obd2.vehicle.speed", min: 0, max: 255, unit: KM_H, frequency: 5, supported: false }, + { pid: 0x0f, name: "obd2.intake.air.temperature", min: -40, max:215, unit: DEGREES_CELSIUS, frequency: 1, supported: false }, + { pid: 0x10, name: "obd2.mass.airflow", min: 0, max: 655, unit: GRAMS_SEC, frequency: 5, supported: false }, + { pid: 0x11, name: "obd2.throttle.position", min: 0, max: 100, unit: POURCENT, frequency: 5, supported: false }, + { pid: 0x1f, name: "obd2.running.time", min: 0, max: 65535, unit: SECONDS, frequency: 1, supported: false }, + { pid: 0x2d, name: "obd2.EGR.error", min: -100, max: 99, unit: POURCENT, frequency: 0, supported: false }, + { pid: 0x2f, name: "obd2.fuel.level", min: 0, max: 100, unit: POURCENT, frequency: 1, supported: false }, + { pid: 0x33, name: "obd2.barometric.pressure", min: 0, max: 255, unit: KPA, frequency: 1, supported: false }, + { pid: 0x4c, name: "obd2.commanded.throttle.position", min: 0, max: 100, unit: POURCENT, frequency: 1, supported: false }, + { pid: 0x52, name: "obd2.ethanol.fuel.percentage", min: 0, max: 100, unit: POURCENT, frequency: 1, supported: false }, + { pid: 0x5a, name: "obd2.accelerator.pedal.position", min: 0, max: 100, unit: POURCENT, frequency: 5, supported: false }, + { pid: 0x5b, name: "obd2.hybrid.battery-pack.remaining.life", min: 0, max: 100, unit: POURCENT, frequency: 5, supported: false }, + { pid: 0x5c, name: "obd2.engine.oil.temperature",min: -40, max: 210, unit: DEGREES_CELSIUS, frequency: 1, supported: false }, + { pid: 0x63, name: "obd2.engine.torque", min: 0, max: 65535, unit: NM, frequency: 1, supported: false }, + }; + + public: + Obd2Handler_c(); + + bool isObd2Request(request); +} |