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/obd2-signals.hpp"
20 #include "utils/signals.hpp"
22 const char *UNIT_NAMES[10] = {
35 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)
36 : pid_{pid}, generic_name_{generic_name}, min_{min}, max_{max}, unit_{unit}, frequency_{frequency}, supported_{supported}
40 uint32_t obd2_signal_t::get_pid()
42 return (uint32_t)pid_;
46 * @fn std::vector<std::string> find_signals(const openxc_DynamicField &key)
47 * @brief return signals name found searching through CAN_signals and OBD2 pid
49 * @param[in] key - can contain numeric or string value in order to search against
50 * can signals or obd2 signals name.
52 * @return Vector of signals name found.
54 void obd2_signal_t::find_obd2_signals(const openxc_DynamicField &key, std::vector<obd2_signal_t*>& found_signals)
58 case openxc_DynamicField_Type::openxc_DynamicField_Type_STRING:
59 lookup_signals_by_name(key.string_value, get_obd2_signals(), found_signals);
61 case openxc_DynamicField_Type::openxc_DynamicField_Type_NUM:
62 lookup_signals_by_id(key.numeric_value, get_obd2_signals(), found_signals);
65 ERROR(binder_interface, "find_signals: wrong openxc_DynamicField specified. Use openxc_DynamicField_Type_NUM or openxc_DynamicField_Type_STRING type only.");
68 DEBUG(binder_interface, "Found %d signal(s)", (int)found_signals.size());
71 bool obd2_signal_t::is_obd2_response(can_message_t can_message)
74 if(can_message.get_id() >= 0x7E8 && can_message.get_id() <= 0x7EF)
76 openxc_VehicleMessage message = {0};
77 message.has_type = true;
78 message.type = openxc_VehicleMessage_Type_DIAGNOSTIC;
79 message.has_diagnostic_response = true;
80 message.diagnostic_response = {0};
81 message.diagnostic_response.has_bus = true;
82 message.diagnostic_response.bus = bus->address;
83 message.diagnostic_response.has_message_id = true;
84 //7DF should respond with a random message id between 7e8 and 7ef
85 //7E0 through 7E7 should respond with a id that is 8 higher (7E0->7E8)
86 if(can_message.get_id() == 0x7DF)
88 message.diagnostic_response.message_id = rand()%(0x7EF-0x7E8 + 1) + 0x7E8;
90 else if(commandRequest->message_id >= 0x7E0 && commandRequest->message_id <= 0x7E7)
92 message.diagnostic_response.message_id = commandRequest->message_id + 8;
94 message.diagnostic_response.has_mode = true;
95 message.diagnostic_response.mode = commandRequest->mode;
96 if(commandRequest->has_pid)
98 message.diagnostic_response.has_pid = true;
99 message.diagnostic_response.pid = commandRequest->pid;
101 message.diagnostic_response.has_value = true;
102 message.diagnostic_response.value = rand() % 100;
103 pipeline::publish(&message, &getConfiguration()->pipeline);
105 else //If it's outside the range, the command_request will return false
107 debug("Sent message ID is outside the valid range for emulator (7DF to 7E7)");
114 void obd2_signal_t::add_request(int pid)
116 DiagnosticRequest request = {
117 arbitration_id: OBD2_FUNCTIONAL_BROADCAST_ID,
118 mode: 0x1, has_pid: true, pid_ };
122 * @brief Check if a request is an OBD-II PID request.
124 * @return true if the request is a mode 1 request and it has a 1 byte PID.
126 bool obd2_signal_t::is_obd2_request(DiagnosticRequest* request)
128 return request->mode == 0x1 && request->has_pid && request->pid < 0xff;
132 * @brief Check if requested signal name is an obd2 pid
134 * @return true if name began with obd2 else false.
136 bool obd2_signal_t::is_obd2_signal(const char *name)
138 if(fnmatch("obd2.*", name, FNM_CASEFOLD) == 0)
144 * @brief Decode the payload of an OBD-II PID.
146 * This function matches the type signature for a DiagnosticResponseDecoder, so
147 * it can be used as the decoder for a DiagnosticRequest. It returns the decoded
148 * value of the PID, using the standard formulas (see
149 * http://en.wikipedia.org/wiki/OBD-II_PIDs#Mode_01).
151 * @param[in] response - the received DiagnosticResponse (the data is in response.payload,
152 * a byte array). This is most often used when the byte order is
153 * signiticant, i.e. with many OBD-II PID formulas.
154 * @param[in] parsed_payload - the entire payload of the response parsed as an int.
156 float obd2_signal_t::decode_obd2_response(const DiagnosticResponse* response, float parsedPayload)
158 return diagnostic_decode_obd2_pid(response);