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QSerialPort Custom BaudRate

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  • K Offline
    K Offline
    kuzulis
    Qt Champions 2020
    wrote on last edited by
    #7

    bq. I check the baud rate using myPort.baudRate() and the return value of setBaudeRate() and for 416000 it returns 9600 resp. false.

    What version of QSerialPort do you use?

    This behavior can be occured in QSerialPort < 5.3, when you try to setup baud rate if a device is not open. You can get error code to see what happens.

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    • N Offline
      N Offline
      Nex46
      wrote on last edited by
      #8

      I have Qt 5.3.1 installed and I set the baud rate after I've called open() function. I tried checking the error like this, just after I set the BR:
      @QSerialPort::SerialPortError e1 = myPort.error();@

      But I don't get any error message. It just returns 0.

      I do get the communication working through the port, but all data is just gibberish.

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      • N Offline
        N Offline
        Nex46
        wrote on last edited by
        #9

        Here's an printout of all baud rates accepted by setBaudRate() between 0 and 600000 in steps of 100.

        600000
        576000
        500000
        480000
        460800
        400000
        375000
        320000
        300000
        250000
        240000
        230400
        200000
        192000
        187500
        160000
        150000
        125000
        120000
        115200
        100000
        96000
        80000
        75000
        64000
        62500
        60000
        57600
        50000
        48000
        40000
        38400
        37500
        32000
        30000
        25000
        24000
        20000
        19200
        16000
        15000
        12800
        12500
        12000
        10000
        9600
        8000
        7500
        6400
        6000
        5000
        4800
        4000
        3200
        3000
        2500
        2400
        2000
        1800
        1600
        1500
        1200
        1000
        800
        600
        500
        400
        300
        200
        100

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        • K Offline
          K Offline
          kuzulis
          Qt Champions 2020
          wrote on last edited by
          #10

          Then you can try latest 5.3.3 sources of QtSerialPort (you should build it manually), there are added some patches to improve detection of custom divider and so on.

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          • N Offline
            N Offline
            Nex46
            wrote on last edited by
            #11

            I can confirm that the latest sources for QtSerialPort work with custom baud rate. Thanks for the help.

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            • K Offline
              K Offline
              kickoune103
              wrote on last edited by kickoune103
              #12

              i have Qt 5.5.1 (Clang 6.1 (Apple), 64 bit)
              Built on Nov 25 2015 01:02:16.

              i try to use QserialPort to 62500.
              i send QByteArray FF000000000000.
              at 115200 work fine with terminal in windows. (FF0000000.. in terminal).

              But if i add SetBaudRate(62500) before open ,(work return true).
              BUT don't work correctly in data.
              i connect terminal windows at 62500(works, i have capture correct trame in protocol who work in 62500)
              the data in terminal is different. C0 00 000...

              Can you help me? please.
              my project may be abandoned why don't work.

              i use two same USB-RS232 converter we work in 62500 ( in windows)
              USB CONVERTER(pc windows) ==> croissing wire ==> USB CONVERTER (in mac Qt)

              thank's

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              • mrjjM Offline
                mrjjM Offline
                mrjj
                Lifetime Qt Champion
                wrote on last edited by
                #13

                hi and welcome
                Have you tried with other serial program on mac side to see
                if qt or USB serial converter driver that is not working as expected with 62500
                something like
                http://www.macupdate.com/app/mac/31352/coolterm

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                • K Offline
                  K Offline
                  kickoune103
                  wrote on last edited by
                  #14

                  cool term not work in 62500, i have test with: stty -f /dev/usb.serial... 62500
                  invalid argument... (work with 9600)

                  have you a term with we work with custom baud or a solution for testing the hardware?

                  thank's for your reply

                  mrjjM 1 Reply Last reply
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                  • K kickoune103

                    cool term not work in 62500, i have test with: stty -f /dev/usb.serial... 62500
                    invalid argument... (work with 9600)

                    have you a term with we work with custom baud or a solution for testing the hardware?

                    thank's for your reply

                    mrjjM Offline
                    mrjjM Offline
                    mrjj
                    Lifetime Qt Champion
                    wrote on last edited by
                    #15

                    @kickoune103
                    Ok. Im only on win and linux so mac is sort of unknown land to me.
                    https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man1/stty.1.html

                    here they mention
                    ispeed number/ ospeed number
                    Set terminal input baud rate to the number given, if possible. If the input baud rate i
                    set to zero, the input baud rate is set to the value of the output baud rate.
                    I wonder if it will allow to set it this way ?

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                    • K Offline
                      K Offline
                      kickoune103
                      wrote on last edited by
                      #16

                      i have solved this probleme to use qt6 beta.
                      with Qserialport 6.

                      but problem: setbaudRate(62500) return true before openning port but the open() bug...

                      the solution: open with standard baud and setBaudRate.

                      i think it's works, i have 0xFF00....

                      i have not tested in QT5.5 to setBaudRate(62500) after open().

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                      • K Offline
                        K Offline
                        kuzulis
                        Qt Champions 2020
                        wrote on last edited by
                        #17

                        with Qserialport 6.

                        there are no qt6 beta and Qserialport 6!

                        but problem: setbaudRate(62500) return true before openning port but the open() bug...

                        On my side (with the PL2303 and with built in on-motherboard's 16550 chip) all fine, so, please give more info or try to lookup a problem on your side.

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                        • K Offline
                          K Offline
                          kickoune103
                          wrote on last edited by
                          #18

                          sorry i use QT 5.6

                          http://download.qt.io/development_releases/qt/5.6/5.6.0-beta/

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