mirror of https://github.com/rusefi/rusefi.git
219 lines
6.6 KiB
C++
219 lines
6.6 KiB
C++
/*
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* @file obd2.cpp
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*
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* ISO 15765-4
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* http://en.wikipedia.org/wiki/OBD-II_PIDs
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*
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* May 2019 status: looks like this code was never tested on any real hardware?
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* @see obd2viaCAN.c
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*
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* @date Jun 9, 2015
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* @author Andrey Belomutskiy, (c) 2012-2018
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*
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* This file is part of rusEfi - see http://rusefi.com
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*
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* rusEfi is free software; you can redistribute it and/or modify it under the terms of
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* the GNU General Public License as published by the Free Software Foundation; either
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* version 3 of the License, or (at your option) any later version.
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*
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* rusEfi is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
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* even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with this program.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "global.h"
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#if EFI_CAN_SUPPORT
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#include "os_access.h"
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#include "engine.h"
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#include "obd2.h"
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#include "can_hw.h"
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#include "vehicle_speed.h"
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#include "map.h"
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#include "maf.h"
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#include "tps.h"
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#include "engine_math.h"
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#include "fuel_math.h"
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#include "thermistors.h"
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extern CANTxFrame txmsg;
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EXTERN_ENGINE
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;
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static LoggingWithStorage logger("obd2");
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static const int16_t supportedPids0120[] = {
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PID_MONITOR_STATUS,
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PID_FUEL_SYSTEM_STATUS,
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PID_ENGINE_LOAD,
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PID_COOLANT_TEMP,
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PID_INTAKE_MAP,
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PID_RPM,
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PID_SPEED,
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PID_TIMING_ADVANCE,
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PID_INTAKE_TEMP,
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PID_THROTTLE,
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-1
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};
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static const int16_t supportedPids2140[] = {
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-1
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};
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static const int16_t supportedPids4160[] = {
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PID_FUEL_RATE,
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-1
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};
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static void obdSendPacket(int mode, int PID, int numBytes, uint32_t iValue) {
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commonTxInit(OBD_TEST_RESPONSE);
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// write number of bytes
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txmsg.data8[0] = (uint8_t)(2 + numBytes);
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// write 2 bytes of header
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txmsg.data8[1] = (uint8_t)(0x40 + mode);
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txmsg.data8[2] = (uint8_t)PID;
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// write N data bytes
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for (int i = 8 * (numBytes - 1), j = 3; i >= 0; i -= 8, j++) {
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txmsg.data8[j] = (uint8_t)((iValue >> i) & 0xff);
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}
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sendCanMessage();
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}
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static void obdSendValue(int mode, int PID, int numBytes, float value) {
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efiAssertVoid(CUSTOM_ERR_6662, numBytes <= 2, "invalid numBytes");
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int iValue = (int)efiRound(value, 1.0f);
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// clamp to uint8_t (0..255) or uint16_t (0..65535)
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iValue = maxI(minI(iValue, (numBytes == 1) ? 255 : 65535), 0);
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obdSendPacket(mode, PID, numBytes, iValue);
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}
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//#define MOCK_SUPPORTED_PIDS 0xffffffff
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static void obdWriteSupportedPids(int PID, int bitOffset, const int16_t *supportedPids) {
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uint32_t value = 0;
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// gather all 32 bit fields
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for (int i = 0; i < 32 && supportedPids[i] > 0; i++)
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value |= 1 << (31 + bitOffset - supportedPids[i]);
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#ifdef MOCK_SUPPORTED_PIDS
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// for OBD debug
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value = MOCK_SUPPORTED_PIDS;
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#endif
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scheduleMsg(&logger, "Write bitfields 0x%08x", value);
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obdSendPacket(1, PID, 4, value);
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}
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static void handleGetDataRequest(CANRxFrame *rx) {
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int pid = rx->data8[2];
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switch (pid) {
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case PID_SUPPORTED_PIDS_REQUEST_01_20:
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scheduleMsg(&logger, "Got lookup request 01-20");
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obdWriteSupportedPids(pid, 1, supportedPids0120);
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break;
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case PID_SUPPORTED_PIDS_REQUEST_21_40:
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scheduleMsg(&logger, "Got lookup request 21-40");
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obdWriteSupportedPids(pid, 21, supportedPids2140);
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break;
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case PID_SUPPORTED_PIDS_REQUEST_41_60:
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scheduleMsg(&logger, "Got lookup request 41-60");
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obdWriteSupportedPids(pid, 41, supportedPids4160);
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break;
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case PID_MONITOR_STATUS:
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scheduleMsg(&logger, "Got monitor status request");
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obdSendPacket(1, pid, 4, 0); // todo: add statuses
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break;
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case PID_FUEL_SYSTEM_STATUS:
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scheduleMsg(&logger, "Got fuel system status request");
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// todo: add statuses
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obdSendValue(1, pid, 2, (2<<8)|(0)); // 2 = "Closed loop, using oxygen sensor feedback to determine fuel mix"
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break;
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case PID_ENGINE_LOAD:
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scheduleMsg(&logger, "Got engine load request");
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obdSendValue(1, pid, 1, getEngineLoadT(PASS_ENGINE_PARAMETER_SIGNATURE) * 2.55f);
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break;
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case PID_COOLANT_TEMP:
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scheduleMsg(&logger, "Got CLT request");
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obdSendValue(1, pid, 1, getCoolantTemperature() + 40.0f);
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break;
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case PID_INTAKE_MAP:
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scheduleMsg(&logger, "Got MAP request");
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obdSendValue(1, pid, 1, getMap(PASS_ENGINE_PARAMETER_SIGNATURE));
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break;
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case PID_RPM:
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scheduleMsg(&logger, "Got RPM request");
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obdSendValue(1, pid, 2, GET_RPM() * 4.0f); // rotation/min. (A*256+B)/4
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break;
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case PID_SPEED:
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scheduleMsg(&logger, "Got speed request");
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obdSendValue(1, pid, 1, getVehicleSpeed());
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break;
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case PID_TIMING_ADVANCE: {
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scheduleMsg(&logger, "Got timing request");
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float timing = engine->engineState.timingAdvance;
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timing = (timing > 360.0f) ? (timing - 720.0f) : timing;
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obdSendValue(1, pid, 1, (timing + 64.0f) * 2.0f); // angle before TDC. (A/2)-64
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break;
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}
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case PID_INTAKE_TEMP:
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scheduleMsg(&logger, "Got IAT request");
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obdSendValue(1, pid, 1, getIntakeAirTemperature() + 40.0f);
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break;
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case PID_INTAKE_MAF:
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scheduleMsg(&logger, "Got MAF request");
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obdSendValue(1, pid, 2, getRealMaf(PASS_ENGINE_PARAMETER_SIGNATURE) * 100.0f); // grams/sec (A*256+B)/100
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break;
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case PID_THROTTLE:
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scheduleMsg(&logger, "Got throttle request");
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obdSendValue(1, pid, 1, getTPS(PASS_ENGINE_PARAMETER_SIGNATURE) * 2.55f); // (A*100/255)
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break;
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case PID_FUEL_RATE:
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scheduleMsg(&logger, "Got fuel rate request");
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obdSendValue(1, pid, 2, engine->engineState.fuelConsumption.perSecondConsumption * 20.0f); // L/h. (A*256+B)/20
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break;
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default:
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scheduleMsg(&logger, "Got unhandled request (PID 0x%02x)", pid);
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}
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}
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static void handleDtcRequest(int numCodes, int *dtcCode) {
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int numBytes = numCodes * 2;
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// write CAN-TP Single Frame header?
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txmsg.data8[0] = (uint8_t)((0 << 4) | numBytes);
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for (int i = 0, j = 1; i < numCodes; i++) {
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txmsg.data8[j++] = (uint8_t)((dtcCode[i] >> 8) & 0xff);
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txmsg.data8[j++] = (uint8_t)(dtcCode[i] & 0xff);
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}
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}
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#if HAL_USE_CAN
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void obdOnCanPacketRx(CANRxFrame *rx) {
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if (rx->SID != OBD_TEST_REQUEST) {
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return;
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}
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if (rx->data8[0] == 2 && rx->data8[1] == OBD_CURRENT_DATA) {
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handleGetDataRequest(rx);
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} else if (rx->data8[0] == 1 && rx->data8[1] == OBD_STORED_DIAGNOSTIC_TROUBLE_CODES) {
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scheduleMsg(&logger, "Got stored DTC request");
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// todo: implement stored/pending difference?
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handleDtcRequest(1, &engine->engineState.warnings.lastErrorCode);
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} else if (rx->data8[0] == 1 && rx->data8[1] == OBD_PENDING_DIAGNOSTIC_TROUBLE_CODES) {
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scheduleMsg(&logger, "Got pending DTC request");
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// todo: implement stored/pending difference?
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handleDtcRequest(1, &engine->engineState.warnings.lastErrorCode);
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} else {
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scheduleMsg(&logger, "Got unhandled OBD message");
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}
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}
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#endif /* HAL_USE_CAN */
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#endif /* EFI_CAN_SUPPORT */
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