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.
18 #include "obd2-signals.hpp"
20 #include "../configuration.hpp"
21 #include "../utils/signals.hpp"
23 const char *UNIT_NAMES[10] = {
36 std::string obd2_signal_t::prefix_ = "diagnostic_messages.";
38 obd2_signal_t::obd2_signal_t(uint8_t pid, const char* generic_name, const int min, const int max, enum UNIT unit, int frequency, bool supported)
39 : pid_{pid}, generic_name_{generic_name}, min_{min}, max_{max}, unit_{unit}, frequency_{frequency}, supported_{supported}
43 uint32_t obd2_signal_t::get_pid()
45 return (uint32_t)pid_;
48 const std::string& obd2_signal_t::get_generic_name() const
53 const std::string obd2_signal_t::get_name() const
55 return prefix_ + "." + generic_name_;
58 const std::string& obd2_signal_t::get_prefix()
63 int obd2_signal_t::get_frequency() const
68 void obd2_signal_t::set_prefix(const std::string& val)
74 * @brief Build a DiagnosticRequest struct to be passed
75 * to diagnostic manager instance.
77 const DiagnosticRequest obd2_signal_t::build_diagnostic_request()
79 return {/*arbitration_id: */OBD2_FUNCTIONAL_BROADCAST_ID,
85 /*payload_length: */0,
86 /*no_frame_padding: */false,
87 /*DiagnosticRequestType: */DiagnosticRequestType::DIAGNOSTIC_REQUEST_TYPE_PID };
90 bool obd2_signal_t::is_obd2_response(can_message_t can_message)
93 if(can_message.get_id() >= 0x7E8 && can_message.get_id() <= 0x7EF)
95 openxc_VehicleMessage message = {0};
96 message.has_type = true;
97 message.type = openxc_VehicleMessage_Type_DIAGNOSTIC;
98 message.has_diagnostic_response = true;
99 message.diagnostic_response = {0};
100 message.diagnostic_response.has_bus = true;
101 message.diagnostic_response.bus = bus->address;
102 message.diagnostic_response.has_message_id = true;
103 //7DF should respond with a random message id between 7e8 and 7ef
104 //7E0 through 7E7 should respond with a id that is 8 higher (7E0->7E8)
105 if(can_message.get_id() == 0x7DF)
107 message.diagnostic_response.message_id = rand()%(0x7EF-0x7E8 + 1) + 0x7E8;
109 else if(commandRequest->message_id >= 0x7E0 && commandRequest->message_id <= 0x7E7)
111 message.diagnostic_response.message_id = commandRequest->message_id + 8;
113 message.diagnostic_response.has_mode = true;
114 message.diagnostic_response.mode = commandRequest->mode;
115 if(commandRequest->has_pid)
117 message.diagnostic_response.has_pid = true;
118 message.diagnostic_response.pid = commandRequest->pid;
120 message.diagnostic_response.has_value = true;
121 message.diagnostic_response.value = rand() % 100;
122 pipeline::publish(&message, &getConfiguration()->pipeline);
124 else //If it's outside the range, the command_request will return false
126 debug("Sent message ID is outside the valid range for emulator (7DF to 7E7)");
135 * @brief Check if a request is an OBD-II PID request.
137 * @return true if the request is a mode 1 request and it has a 1 byte PID.
139 bool obd2_signal_t::is_obd2_request(DiagnosticRequest* request)
141 return request->mode == 0x1 && request->has_pid && request->pid < 0xff;
145 * @brief Check if requested signal name is an obd2 pid
147 * @return true if name began with obd2 else false.
149 bool obd2_signal_t::is_obd2_signal(const std::string& name)
151 if(name.find_first_of(prefix_.c_str(), 0, prefix_.size()))
157 * @brief Decode the payload of an OBD-II PID.
159 * This function matches the type signature for a DiagnosticResponseDecoder, so
160 * it can be used as the decoder for a DiagnosticRequest. It returns the decoded
161 * value of the PID, using the standard formulas (see
162 * http://en.wikipedia.org/wiki/OBD-II_PIDs#Mode_01).
164 * @param[in] response - the received DiagnosticResponse (the data is in response.payload,
165 * a byte array). This is most often used when the byte order is
166 * signiticant, i.e. with many OBD-II PID formulas.
167 * @param[in] parsed_payload - the entire payload of the response parsed as an int.
169 float obd2_signal_t::decode_obd2_response(const DiagnosticResponse* response, float parsedPayload)
171 return diagnostic_decode_obd2_pid(response);