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/*
* 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"
};
typedef struct _Obd2Pid {
uint8_t pid;
const char* name;
const int min;
const int max;
enum UNIT unit;
int frequency;
} 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: 0x4, name: "obd2.engine.load", min:0, max: 100, unit: POURCENT, frequency: 5 },
{ pid: 0x5, name: "obd2.engine.coolant.temperature", min: -40, max: 215, unit: DEGREES_CELSIUS, frequency: 1 },
{ pid: 0xa, name: "obd2.fuel.pressure", min: 0, max: 765, unit: KPA, frequency: 1 },
{ pid: 0xb, name: "obd2.intake.manifold.pressure", min: 0, max: 255, unit: KPA, frequency: 1 },
{ pid: 0xc, name: "obd2.engine.speed", min: 0, max: 16383, unit: RPM, frequency: 5 },
{ pid: 0xd, name: "obd2.vehicle.speed", min: 0, max: 255, unit: KM_H, frequency: 5 },
{ pid: 0xf, name: "obd2.intake.air.temperature", min: -40, max:215, unit: DEGREES_CELSIUS, frequency: 1 },
{ pid: 0x10, name: "obd2.mass.airflow", min: 0, max: 655, unit: GRAMS_SEC, frequency: 5 },
{ pid: 0x11, name: "obd2.throttle.position", min: 0, max: 100, unit: POURCENT, frequency: 5 },
{ pid: 0x1f, name: "obd2.running.time", min: 0, max: 65535, unit: SECONDS, frequency: 1 },
{ pid: 0x2d, name: "obd2.EGR.error", min: -100, max: 99, unit: POURCENT, frequency: 0 },
{ pid: 0x2f, name: "obd2.fuel.level", min: 0, max: 100, unit: POURCENT, frequency: 1 },
{ pid: 0x33, name: "obd2.barometric.pressure", min: 0, max: 255, unit: KPA, frequency: 1 },
{ pid: 0x4c, name: "obd2.commanded.throttle.position", min: 0, max: 100, unit: POURCENT, frequency: 1 },
{ pid: 0x52, name: "obd2.ethanol.fuel.percentage", min: 0, max: 100, unit: POURCENT, frequency: 1 },
{ pid: 0x5a, name: "obd2.accelerator.pedal.position", min: 0, max: 100, unit: POURCENT, frequency: 5 },
{ pid: 0x5b, name: "obd2.hybrid.battery-pack.remaining.life", min: 0, max: 100, unit: POURCENT, frequency: 5 },
{ pid: 0x5c, name: "obd2.engine.oil.temperature",min: -40, max: 210, unit: DEGREES_CELSIUS, frequency: 1 },
{ pid: 0x63, name: "obd2.engine.torque", min: 0, max: 65535, unit: NM, frequency: 1 },
};
/*
* Will be populated with constructor
*/
Obd2Pid supported_pids[];
public:
Obd2Handler_c();
bool isObd2Request(request);
}
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