mirror of
https://github.com/SemvdH/OBD2-car-display.git
synced 2025-12-15 04:01:04 +00:00
139 lines
3.7 KiB
C
139 lines
3.7 KiB
C
/*
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BT module settings (AT mode):
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+NAME=OBD2_BT
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+VER=8.0.2,FSC-BT836B
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+MAC=DC0D30000FA9
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+BAUD=115200
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+PIN=1189
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HC-05 bluetooth module:
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address: 5856:00:017A39
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IAC: 9E8B33
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https://forum.arduino.cc/t/trying-to-connect-hc-05-to-bluetooth-obd2-interface-elm-327/643301/13
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https://stackoverflow.com/questions/59125470/connecting-to-elm327-bt-with-hc05-stm32-not-as-simply-as-look-like
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https://electronics.stackexchange.com/questions/101572/hc-05-bluetooth-module-not-responding-to-certain-commands
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OBD2 INQ: 0010:CC:4F3603,0,FF9C,OBDII
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AT+PAIR=0010,CC,4F3603,20
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AT Commands to connect permanently to the OBD2 module:
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AT+RESET
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AT+ORGL (Set to original)
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AT+ROLE=1 (Set to Master)
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AT+CMODE=0 (Set connect to a specific address)
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AT+BIND=0010,CC,4F3603
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AT+INIT (Need to connect)
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AT+PAIR=0010,CC,4F3603,20 (,20 means 30 second timeout)
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Be sure to disconnect the TX and RX pins from the BT module when programming the arduino.
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*/
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#ifndef OBD2_ELM327_H
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#define OBD2_ELM327_H
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#include "ELMduino.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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// #include <Arduino.h>
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// #include "obd2_util.h"
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/* pins */
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#define PIN_BT_RX 19
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#define PIN_BT_TX 18
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#define BT_STATE_PIN 3 /* state connection pin from bluetooth module -> level high on connected */
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#define BT_BAUD 115200
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#define ELM327_BAUD 115200
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#define BT_STATE_LENGTH 13 /* length of the string identifier used for the states */
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#define ELM327_SERIAL Serial2
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#define UPDATE_RPM_POS 0x00
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#define UPDATE_THROTTLE_POS 0x01
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#define UPDATE_COOLANT_TEMP_POS 0x02
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#define UPDATE_INTAKE_AIR_TEMP_POS 0x03
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#define UPDATE_AMBIENT_AIR_TEMP_POS 0x04
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#define UPDATE_OIL_TEMP_POS 0x05
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#define UPDATE_ENGINE_LOAD_POS 0x06
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#define UPDATE_BATTERY_VOLTAGE_POS 0x07
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#define UPDATE_FUEL_PRESSURE_POS 0x08
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#define UPDATE_SPEED_POS 0x09
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#define UPDATE_MANIFOLD_PRESSURE_POS 0x0A
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#define UPDATE_FUEL_LEVEL_POS 0x0B
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enum BluetoothState
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{
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BT_INITIALISING = 0,
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BT_CONNECTED = 1
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};
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/**
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* @brief struct to hold bluetooth module data
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*
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* @param state the current state of the bluetooth module
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* @param on_state_change function pointer to the function to be called when the state changes
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*/
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typedef struct obt2_elm327_tag
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{
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ELM327 *elm327;
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enum BluetoothState bt_state;
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void (*on_state_change)();
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uint16_t value_updates;
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uint16_t rpm;
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uint8_t throttle_percent;
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uint8_t engine_coolant_temp;
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uint8_t intake_air_temp;
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uint8_t ambient_air_temp;
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uint16_t engine_oil_temp;
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uint8_t engine_load;
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float battery_voltage;
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uint16_t fuel_pressure;
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uint8_t speed;
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uint8_t manifold_pressure;
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uint16_t fuel_level;
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} obd2_elm327_t;
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/**
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* @brief initializes the bluetooth module driver
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*
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* @param elm327 pointer to struct holding bluetooth driver data
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* @returns 1 if successfully initialized, 0 if not.
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*/
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char obd2_elm327_init(obd2_elm327_t *elm327);
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/**
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* @brief processes the bluetooth module communication with the OBD2 reader for variables that change quickly
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*
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* @param bt pointer to struct holding bluetooth driver data
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*/
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void obd2_elm327_process_fast(obd2_elm327_t *elm327);
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/**
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* @brief processes the bluetooth module communication with the OBD2 reader for variables that change slowly
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*
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* @param bt pointer to struct holding bluetooth driver data
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*/
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void obd2_elm327_process_slow(obd2_elm327_t *elm327);
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void obd2_elm327_check_connection(obd2_elm327_t *elm327);
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/**
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* @brief copies the current state of the bluetooth module to the state string
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*
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* @param elm327 pointer to struct holding bluetooth driver data
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* @param state resulting string to hold the text representation of the state
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*/
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void obd2_elm327_get_state(obd2_elm327_t *elm327, char *state);
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#ifdef __cplusplus
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}
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#endif
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#endif // OBD2_ELM327_H
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