- #BMW IBUS INTERFACE SERIAL#
- #BMW IBUS INTERFACE SOFTWARE#
- #BMW IBUS INTERFACE CODE#
- #BMW IBUS INTERFACE PC#
Note that all this document is based on analysis done in a E39 (July 2000) with a MK II navigation system. After exchanges with Thomas, I built my own interface to start I-Bus analysis with the objective to interface a MP3 pic based player fully integrated with the board monitor.
#BMW IBUS INTERFACE PC#
Wood, who has connected a Linux embedded PC in his E39 (without NAV) to play MP3. (V1.00) Steering Wheel Messages Messages to Radio (68H) Messages to Telephone (C8H) Instrument Control Messages (IKE) Messages to OBC Text (E7H) Board Monitor Buttons (Nav system) Messages to Radio (68H) Messages to Navigation / Video (3BH) Broadcast Messages (FFH) RADIO Messages Messages to Navigation / Video (3BH) Messages to Instrument Control Electronics IKE (80H) Messages to CD Player (18H) I-BUS INSIDE 2ģ CD PLAYER Messages CD Player behaviour Broadcast Messages (FFH) Messages to Radio (68H) Navigation / Vidéo module Messages Messages to IKE (80H) I-BUS INSIDE 3Ĥ Introduction and warning A part of this information is based on research done by Thomas L.
#BMW IBUS INTERFACE SOFTWARE#
9 Hardware to read/write I-BUS Basic Interface Contention Detection Interface Melexis Chip Interface I-BUS Analyser software The I-Bus Analyser Software.
#BMW IBUS INTERFACE SERIAL#
Instructions on setting up the debug environment are available in the Operation and Testing section.1 I-BUS Inside Inside the BMW Cars entertainement Serial Bus Written by Franck Touanen.
#BMW IBUS INTERFACE CODE#
See latest Arduino sketch code for more details (debug comments). Use your favorite serial monitoring software – I personally prefer PuTTy. For the UNO R3 we use pins 7 (Rx) and 8 (Tx) for our Software Serial. This allows us to use a USB-TTL converter to monitor what the Arduino is seeing and doing. The Arduino programming includes optional debugging via Software Serial. Pins 14 (RESET) and 15 (SENSE) are not used for this project.
We do not need this feature, so we ground pin 8 (SI), the comparator input. Pins 7 (SO) and 8 (SI) on the TH3122 can be used as a universal comparator. Pin 3 (VTR) is connected to VCC It sets reset timing (See TH3122 Datasheet). This is used in the Arduino programming to tell when it’s safe to send data onto the K-Bus. The SEN/STA signal stays High while there is data/activity on the K-Bus, and goes Low when there is noĪctivity. Pin 9 (SEN/STA) is connected to the Arduino’s digital input pin 3. Pin 10 (RX) is connected to the Arduino’s receive pin. Pin 11 (TX) is connected to the Arduino’s transmit pin. The TH3122 will automatically re-enable VCC (Pin 16) once it sees activity on the I/K-Bus – which will wake up our arduino. We will use this in the arduino programming to shut down the arduino when there is no activity on the I/K-Bus after a certain time period. Pin 2 (EN) enables the +5 Voltage regulator output on pin 16 (VCC). I stuck with 1uF for flexibility (smaller variety of parts), due to the MAX232 datasheet specifying 1uF – for the RS232 interface. VCC (Pin 16) provides the arduino with +5V It is also connected to a 1uF capacitor (C5) to reduce short time voltage drops.Ĭapacitor C5 is suggested to be above 2uF in the TH3122 datasheet. The circuit has a 47uF capacitor on the +12V line to reduce short time voltage drops. +12V supply voltage passes through a diode (D1), and connects to pin 1 (VS) which powers the TH3122. The RC filter is a 10 ohm resistor and a 100pF non-polarized capacitor. The RC filter minimizes EMI on the BUS line, and is recommended per TH3122 datasheet. The BMW K-Bus wire passes through an RC filter and then connects to pin 6 (BUS) on TH3122.
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