issue with serin and serout

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  1. - 1st August 2007, 11:28 #1
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    mackrackit
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    Looking back at your first post and I am still not clear on a few things.
    ECU to PC = YES
    PIC to PC = YES
    ECU to PIC = NO

    You may want to look at the PBP manual, I can not find 38400 as a baud rate and 6 is 9600 for SERIN/SEROUT.
    o btw the ECU operates at 38400 baud rate thast why theres a 6 there.
    Others have talked about using a PIC with an ECU, I have not done so, beyond basic serial com I can not help. So the best I can suggest at this point is to double check the baud rates and if the data is true or inverted.
    Dave
    Always wear safety glasses while programming.
  2. - 1st August 2007, 16:59 #2
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    i was under the impression teh baud rate was simply a calculation, (1000000 / baud) - 20


    when i connected a PC to PORTA.0 and PORTA.1 it was able to send and recieve data at 38400 baud rate. actually now that u mention it, the one thing i DON't know is if the ECU wants the data true or inverted. i imagine true. how would i set it to inverted? the microcode reference suggests bit 14, but i'm confused how to set bit 14 ?

    thanks,
    Jordan
  3. - 1st August 2007, 17:23 #3
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    Here is some info on Baud Rate. http://francis.courtois.free.fr/jc1/...BitFormat.html
    The formula you are looking at from the manual is for figuring bit time in microseconds.

    In the back of the manual, Appendix A, there is a table for SREIN2/SEROUT2.
    Code:
    SERIN2 PORT?.?,84,[your DATA]
    Will receive at 9600,Driven, True, no parity.
    Dave
    Always wear safety glasses while programming.
  4. - 1st August 2007, 17:29 #4
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    You got it while I was replying.
    I do not think I was much help, Now I am confused
    Would you mind posting the code that works so maybe I can learn something?
    Dave
    Always wear safety glasses while programming.
  5. - 1st August 2007, 23:43 #5
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    Well, it turns out i was wrong.

    i only tested it for a few minutes this morning, and upon further inspection this afternoon it turns out, while i was recieving data, the data was completely inaccurate. im very confused. all i know is the ECU should talk at 38400 8N1. i've tried a LOT of combinations and i can't figure it out.

    thanks,
    Jordan
  6. - 2nd August 2007, 01:17 #6
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    OK FINALLY GOT ITTT!!!!! WOO HOOO. forgot to connect a common ground! i am an idiot! btw - 6 works perfect for 38400 8N1!

    thanks for the help
    Jordan
  7. - 2nd August 2007, 05:32 #7
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    GREAT!!!
    Now I need to do some studying
    Dave
    Always wear safety glasses while programming.
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