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  4. How to modify timing in readyRead of QextSeriaport
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How to modify timing in readyRead of QextSeriaport

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  • M Offline
    M Offline
    mattiad
    wrote on last edited by
    #1

    Dear All,

    I've a problem with the QExtSerialPort in QT. I'm developing for an IMX6UL CPU under a linux based operating system.

    I've noticed that, at baud 9600, SIGNAL readyRead is "active" about 35ms after having sent my serial string (which is composed of 3 characters, so about 3ms)

    In this way, if I try to communicate with the CPU, I can use a maximum frequency of about 30Hz, which is too low for my application.

    Furthermore, if I use lower baudrates, the time of 35 ms becomes bigger ( 80ms for 4800, 175 ms for 2400).

    My goal is that readyReady becomes active when I'm not transmitting for a time of 3,5 characters (i.e. or baud of 9600, a time of 3,5 / 4 ms).

    Should I modify the readyread funcion?

    I'd like to keep this library because I've already wrote a lot of code.

    Thank you in advance

    jsulmJ 1 Reply Last reply
    0
    • M mattiad

      Dear All,

      I've a problem with the QExtSerialPort in QT. I'm developing for an IMX6UL CPU under a linux based operating system.

      I've noticed that, at baud 9600, SIGNAL readyRead is "active" about 35ms after having sent my serial string (which is composed of 3 characters, so about 3ms)

      In this way, if I try to communicate with the CPU, I can use a maximum frequency of about 30Hz, which is too low for my application.

      Furthermore, if I use lower baudrates, the time of 35 ms becomes bigger ( 80ms for 4800, 175 ms for 2400).

      My goal is that readyReady becomes active when I'm not transmitting for a time of 3,5 characters (i.e. or baud of 9600, a time of 3,5 / 4 ms).

      Should I modify the readyread funcion?

      I'd like to keep this library because I've already wrote a lot of code.

      Thank you in advance

      jsulmJ Offline
      jsulmJ Offline
      jsulm
      Lifetime Qt Champion
      wrote on last edited by
      #2

      @mattiad Is there a reason why you don't use http://doc.qt.io/qt-5/qserialport.html ?

      https://forum.qt.io/topic/113070/qt-code-of-conduct

      1 Reply Last reply
      0
      • M Offline
        M Offline
        mattiad
        wrote on last edited by
        #3

        Dear @jsulm , if I use QSerialport will I be able to reduce this time?

        jsulmJ 1 Reply Last reply
        0
        • M mattiad

          Dear @jsulm , if I use QSerialport will I be able to reduce this time?

          jsulmJ Offline
          jsulmJ Offline
          jsulm
          Lifetime Qt Champion
          wrote on last edited by
          #4

          @mattiad I don't know. But you could try and see whether it makes any difference.

          https://forum.qt.io/topic/113070/qt-code-of-conduct

          M 1 Reply Last reply
          0
          • M Offline
            M Offline
            mattiad
            wrote on last edited by
            #5

            I'll try. I haven't use it because its libraries were not included in the kernel

            jsulmJ 1 Reply Last reply
            0
            • M mattiad

              I'll try. I haven't use it because its libraries were not included in the kernel

              jsulmJ Offline
              jsulmJ Offline
              jsulm
              Lifetime Qt Champion
              wrote on last edited by
              #6

              @mattiad What kernel do you mean?

              https://forum.qt.io/topic/113070/qt-code-of-conduct

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              0
              • M Offline
                M Offline
                mattiad
                wrote on last edited by
                #7

                Sorry, I meant in the file system . Now I'll try adding the Libqt5serialport.so.5.

                J.HilkJ 1 Reply Last reply
                0
                • M mattiad

                  Sorry, I meant in the file system . Now I'll try adding the Libqt5serialport.so.5.

                  J.HilkJ Offline
                  J.HilkJ Offline
                  J.Hilk
                  Moderators
                  wrote on last edited by
                  #8

                  @mattiad Because this thread is in the category Mobile and Embedded I'll mention, that QSerialPort is not a 100%
                  supported for Android and IOS, info: here and here

                  For the partial android support take a look here.


                  Be aware of the Qt Code of Conduct, when posting : https://forum.qt.io/topic/113070/qt-code-of-conduct


                  Q: What's that?
                  A: It's blue light.
                  Q: What does it do?
                  A: It turns blue.

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                  • M Offline
                    M Offline
                    mattiad
                    wrote on last edited by
                    #9

                    Dear @J-Hilk thank you for the information. I'm using yocto so I suppose it's fully compatible

                    1 Reply Last reply
                    0
                    • jsulmJ jsulm

                      @mattiad I don't know. But you could try and see whether it makes any difference.

                      M Offline
                      M Offline
                      mattiad
                      wrote on last edited by
                      #10

                      @jsulm I've tried but I have the same problem. It takes too much time before havin bytes available in the buffer

                      mrjjM 1 Reply Last reply
                      0
                      • M mattiad

                        @jsulm I've tried but I have the same problem. It takes too much time before havin bytes available in the buffer

                        mrjjM Offline
                        mrjjM Offline
                        mrjj
                        Lifetime Qt Champion
                        wrote on last edited by
                        #11

                        @mattiad
                        Its not possible to just use higher baud than 9600 ?
                        To get better speed i mean.

                        1 Reply Last reply
                        0
                        • M Offline
                          M Offline
                          mattiad
                          wrote on last edited by
                          #12

                          @mrjj yes, I've already tried and verified that it works with higher baud my application must work with a baud of 9600

                          1 Reply Last reply
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