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Thread: QSerialPort High Speed Serial Reading from board and Logging Issue

  1. #21
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    Default Re: QSerialPort High Speed Serial Reading from board and Logging Issue

    OK. Create an else for if in line 13
    Qt Code:
    1. if(one_packet[0] == 's') // 's' buldur kodu yaz dene!
    2. {
    3. }
    4. else
    5. {
    6. qDebug() << one_packet;
    7. }
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  2. #22
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    Default Re: QSerialPort High Speed Serial Reading from board and Logging Issue

    Quote Originally Posted by Lesiok View Post
    OK. Create an else for if in line 13
    Qt Code:
    1. if(one_packet[0] == 's') // 's' buldur kodu yaz dene!
    2. {
    3. }
    4. else
    5. {
    6. qDebug() << one_packet;
    7. }
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    Code never fall into there because i always handling with that error with this code.

    Qt Code:
    1. indexOfType = ArrayBuffer.indexOf('s');
    2.  
    3. if(indexOfType >= 1)
    4. {
    5. ArrayBuffer.remove(0,indexOfType);
    6. }
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    If any errorful package comes starting without 's' it will be removed from package and my loss will be just 1 number. But i'm losing 3000-4000 numbers.

  3. #23
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    Default Re: QSerialPort High Speed Serial Reading from board and Logging Issue

    After ArrayBuffer.remove(0,indexOfType); ArrayBuffer can be shorter than ExpectedPacketLength.
    P.S.
    If data in frame are binary then every byte in frame can be 's'.
    Last edited by Lesiok; 23rd January 2017 at 12:09.

  4. #24
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    Default Re: QSerialPort High Speed Serial Reading from board and Logging Issue

    Actually it is not a problem because when ArrayBuffer.size below the expected packet length its leaving the slot and waiting for readyRead signal and i debugged it and see that:

    Last 6 bytes to be processed e.g : {value,value,'s',value,value,value}. first two value is removed. and became {'s',value,value,value}. Then readyRead is emitted by the QT and data is appending to buffer again and these 4 bytes of ArrayBuffer which inherited by the last process is appended with the other {value,'s',value, bla bla... } data. And i checked their CRC and values. Everything is ok. But sometimes this buffer gets wrong number. Lets say we counted 1 to 150 without error and our buffer stayed like i exampled. Then its not 151 it became 500 or 1000 directly.

    Really hard to explain. I'm trying my best. Thanks for trying to help.

  5. #25
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    Default Re: QSerialPort High Speed Serial Reading from board and Logging Issue

    It is a problem because after remove You have in buffer only 4 bytes not 5. Try this code :
    Qt Code:
    1. if(indexOfType >= 1)
    2. {
    3. ArrayBuffer.remove(0,indexOfType);
    4. if( ArrayBuffer.size() < ExpectedPacketLength )
    5. break;//We exit the loop
    6. }
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  6. #26
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    Default Re: QSerialPort High Speed Serial Reading from board and Logging Issue

    I added this but nothing changed. I will struggle more about this. If i can find the bug will post it to here.

    Thanks for all your helps really.

  7. #27
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    Default Re: QSerialPort High Speed Serial Reading from board and Logging Issue

    Hi again to everyone.

    I figure out the problem it's about while loop when readyread signal is emitted in the parsing state. Now if i remove the loops and just emit the readyread signal and directly parse , it became correct but really slow because everytime when data is received parsing will be done.

    Have i got any option to receive data and parse it simultaneously. How can i use serial thread and my object simultaneously ? Just need a documentation or an idea. I searched documentation but couldn't understand fully. Thanks a lot.

  8. #28
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    Default Re: QSerialPort High Speed Serial Reading from board and Logging Issue

    About which loop you speak ? Basically, you do not need an additional thread to handle serial port.

  9. #29
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    Default Re: QSerialPort High Speed Serial Reading from board and Logging Issue

    Quote Originally Posted by Lesiok View Post
    About which loop you speak ? Basically, you do not need an additional thread to handle serial port.
    Qt Code:
    1. while(ArrayBuffer.size() >= ExpectedPacketLength)
    To copy to clipboard, switch view to plain text mode 

    here this is the loop i mention about. When parsing is going on readAll can't get the data while loop was going on. I'm thinking creating another thread and when run it arraybuffer will be parsed simultaneously while reading data from serial port is going on.

    Am i thinking wrong ?

    Thanks.

  10. #30
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    Default Re: QSerialPort High Speed Serial Reading from board and Logging Issue

    What are You doing in "parsing" ?
    If signal emiter and receiver are both in this same thread sending signal is like normal function calling. So that a new signal is issued only after the previous service.

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