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Thread: Fbus protocol problem

  1. #1

    Fbus protocol problem

    Dear All,

    Nice to meet all! I was come from Hong Kong which is a student which doing a school project about using MCU AT89S52 to control Nokia 6150(FBus) to send and receive SMS. I already made the circuit and successful send and receive data through HyperTerminal

    I downloaded a protocol for Nokia 6150, I have some problem would you mind give me a help?

    According "Frame format for FBUS", I am not very clear how to using following fields.

    <1 byte FrameID><1 byte destination><1 byte source><1 byte cmd><2 bytes data length (= n + 2 )><n bytes data><1 byte frame to go><1 byte sequence number><2 bytes checksum>

    data length - The length is the data before pack into byte or is the length after pack into byte?
    Padding Byte - This field is depend on the lenght of data or whole frame(i.e.FrameID to checksum)?
    frame to go - I do not know when is need this field. If the packet is not a part of a group(long sms), is it no need to including this feild?

    The last question is how to synchronize to the phone, I readed website embedtronics about Nokia F-bus Protocol. It say synchronize to the phone by sendind a string of 0x55 or 'U' 128 times, but i can not successful synchronize. I have follow question.
    1. Sending the 128 times 'U', is it also need send a whole FBus packet?? i.e. it is need the other field <1 byte FrameID><1 byte destination><1 byte source><1 byte cmd><2 bytes data length (= n + 2 )><1 byte frame to go><1 byte sequence number><2 bytes checksum>?
    2. It is need pack 128 'U' into byte or not? That is, not send 0x55 128 times, send (0xD5,0x6A,0xB5,0x5A,0xAD,0x56,0xAB) x 16 times?
    3. If need sending a whole packet, what the cmd should use for synchronization?

    I was stuck on synchronize to the phone, I am very need all you help!!! Thank you!!

    Bun

  2. #2
    I am new here.............................................................

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