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QSerialPort data missing while reading

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  • B Offline
    B Offline
    biomed12
    wrote on last edited by
    #1

    Hello,

    I am tring to get data over serial port with my desktop program.

    Data is corrupted many times like below (I except always 0 data)

    "266"
    "10"
    "10"
    "10"
    "10"
    "10"
    "3"
    "3"
    "2"
    "2"
    "0"
    "0"
    "0"
    "0"
    "2"
    "2"
    "4"
    "4"
    "0"
    "0"
    "4"
    "4"
    "0"
    "0"
    "0"
    "0"
    "0"

    Device side code is:

    //uart send function
    void UARTSend(uint32_t ui32UARTBase, const uint8_t *pui8Buffer, uint32_t ui32Count)
    {
        while(ui32Count--)
        {
            UARTCharPut(ui32UARTBase, *pui8Buffer++);
        }
    		
    }
    

    Qt side is:

    
    union{
        unsigned char bytes[2];
        unsigned int integerPart;
        unsigned char *ptr;
    }serData;
    
    void MySoftware::serialReadData()
    {
        //read all data
         serialInData = serial->readAll();
    
    //assign it to union
        serData.bytes[0] = (unsigned char)serialInData[0];
        serData.bytes[1] = (unsigned char)serialInData[1];
    
    //debug
        qDebug()<<QString::number(serData.integerPart);
    
    }
    

    note: I used qSerialExamples. I saw some topic which is related with my problem but, there was no certain solution.

    1 Reply Last reply
    0
    • SGaistS Offline
      SGaistS Offline
      SGaist
      Lifetime Qt Champion
      wrote on last edited by
      #2

      Hi and welcome to devnet,

      How are you configuring your serial port ?

      What do you mean by corrupted ?
      How do you know that you have received a full frame of data ?

      Interested in AI ? www.idiap.ch
      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

      1 Reply Last reply
      0
      • B Offline
        B Offline
        biomed12
        wrote on last edited by
        #3

        0_1489099842910_upload-d6790b76-b33b-446f-905f-ac73d0a10bf4

        This is my settings. I can read all data with labview. This is also my configuring code which get the definitions from gui.

            serial->setPortName(p.name);
            serial->setBaudRate(p.baudRate);
            serial->setDataBits(p.dataBits);
            serial->setFlowControl(p.flowControl);
            serial->setParity(p.parity);
            serial->setStopBits(p.stopBits);
        

        and how can i know if i get full frame of data or not?

        jsulmJ M 2 Replies Last reply
        0
        • K Offline
          K Offline
          karti gesar
          wrote on last edited by
          #4

          QByteArray block;
          QDataStream out(&block, QIODevice::WriteOnly);
          QByteArray q = serial.readAll();
          block.append(q);

          1 Reply Last reply
          0
          • B biomed12

            0_1489099842910_upload-d6790b76-b33b-446f-905f-ac73d0a10bf4

            This is my settings. I can read all data with labview. This is also my configuring code which get the definitions from gui.

                serial->setPortName(p.name);
                serial->setBaudRate(p.baudRate);
                serial->setDataBits(p.dataBits);
                serial->setFlowControl(p.flowControl);
                serial->setParity(p.parity);
                serial->setStopBits(p.stopBits);
            

            and how can i know if i get full frame of data or not?

            jsulmJ Offline
            jsulmJ Offline
            jsulm
            Lifetime Qt Champion
            wrote on last edited by
            #5

            @biomed12 Well, it would help more if you would say what the values of baudRate, dataBits, ... actually are.
            "and how can i know if i get full frame of data or not?" - this is something you need to specify (define a protocol).

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

            B 1 Reply Last reply
            1
            • VRoninV Offline
              VRoninV Offline
              VRonin
              wrote on last edited by VRonin
              #6
              • serialInData = serial->readAll(); does not read ALL you sent, it just read all that is available at that moment
              • use QDataStream
              void MySoftware::serialReadData()
              {
              quint32 receivedNumber;
              QDataStream readStream(serial);
              for(;;){
              readStream.startTransaction();
              readStream >> receivedNumber;
              if(readStream.commitTransaction())
              qDebug() << receivedNumber;
              else
              break;
              }
              }
              

              I'm not sure how UARTCharPut handles endianness, QDataStream assumes big-endian byte order

              "La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
              ~Napoleon Bonaparte

              On a crusade to banish setIndexWidget() from the holy land of Qt

              1 Reply Last reply
              2
              • jsulmJ jsulm

                @biomed12 Well, it would help more if you would say what the values of baudRate, dataBits, ... actually are.
                "and how can i know if i get full frame of data or not?" - this is something you need to specify (define a protocol).

                B Offline
                B Offline
                biomed12
                wrote on last edited by biomed12
                #7

                @jsulm

                ok, program side is:

                    serial->setBaudRate(QSerialPort::Baud57600);
                    serial->setStopBits(QSerialPort::TwoStop);
                    serial->setPortName("COM8");
                    serial->setDataBits(QSerialPort::Data8);
                    serial->setFlowControl(QSerialPort::NoFlowControl);
                    serial->setParity(QSerialPort::NoParity);
                
                   serial->setReadBufferSize(4);
                
                

                device side is:

                ROM_UARTConfigSetExpClk(UART6_BASE,systemClock , 57600,
                                            (UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_TWO|
                                             UART_CONFIG_PAR_NONE));
                
                ...
                
                //uart send function
                void UARTSend(uint32_t ui32UARTBase, const uint8_t *pui8Buffer, uint32_t ui32Count)
                {
                    while(ui32Count--)
                    {
                        UARTCharPut(ui32UARTBase, *pui8Buffer++);
                				
                				while(!UARTBusy(ui32UARTBase))
                				{
                					
                				}
                	}	
                }
                ...
                
                //the data will be sended
                	sendData[0] = 'a';
                	sendData[1] = adcValue.bytes[0];
                	sendData[2] = (adcValue.bytes[1] & 15);
                	sendData[3] = 'b';
                
                //and send the data
                UARTSend(UART6_BASE,sendData , 4);
                
                
                

                And I created a protocol. Data frame start with 'a' char and stop with 'b' char. So I added a control loop like below, but i get a lot of break frame. So, I discard the value in this situation but, the data is valueable for me. There are much broken frame...

                union{
                    unsigned char bytes[2];
                    unsigned int integerPart;
                    unsigned char *ptr;
                }serData;
                
                void MedicalSoftware::serialReadData()
                {
                    QByteArray serialInData;
                    //
                    serialInData = serial->readAll();
                    //
                    if(serialInData.length()!= 4 || serialInData[0] != 'a' || serialInData[3] != 'b')
                    {
                        
                        ErrorMessage("missing"); //this is my custom error debugger which shows message
                        serial->clear();
                        return;
                    }
                
                    serData.bytes[0] =(unsigned char)serialInData[1];
                    serData.bytes[1] =(unsigned char)serialInData[2];
                
                
                    if(plotDataButtonStatus == true)
                    {
                        plotMainGraph(serData.integerPart);
                    }
                    serData.integerPart = 0;
                }
                
                M 2 Replies Last reply
                0
                • B biomed12

                  @jsulm

                  ok, program side is:

                      serial->setBaudRate(QSerialPort::Baud57600);
                      serial->setStopBits(QSerialPort::TwoStop);
                      serial->setPortName("COM8");
                      serial->setDataBits(QSerialPort::Data8);
                      serial->setFlowControl(QSerialPort::NoFlowControl);
                      serial->setParity(QSerialPort::NoParity);
                  
                     serial->setReadBufferSize(4);
                  
                  

                  device side is:

                  ROM_UARTConfigSetExpClk(UART6_BASE,systemClock , 57600,
                                              (UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_TWO|
                                               UART_CONFIG_PAR_NONE));
                  
                  ...
                  
                  //uart send function
                  void UARTSend(uint32_t ui32UARTBase, const uint8_t *pui8Buffer, uint32_t ui32Count)
                  {
                      while(ui32Count--)
                      {
                          UARTCharPut(ui32UARTBase, *pui8Buffer++);
                  				
                  				while(!UARTBusy(ui32UARTBase))
                  				{
                  					
                  				}
                  	}	
                  }
                  ...
                  
                  //the data will be sended
                  	sendData[0] = 'a';
                  	sendData[1] = adcValue.bytes[0];
                  	sendData[2] = (adcValue.bytes[1] & 15);
                  	sendData[3] = 'b';
                  
                  //and send the data
                  UARTSend(UART6_BASE,sendData , 4);
                  
                  
                  

                  And I created a protocol. Data frame start with 'a' char and stop with 'b' char. So I added a control loop like below, but i get a lot of break frame. So, I discard the value in this situation but, the data is valueable for me. There are much broken frame...

                  union{
                      unsigned char bytes[2];
                      unsigned int integerPart;
                      unsigned char *ptr;
                  }serData;
                  
                  void MedicalSoftware::serialReadData()
                  {
                      QByteArray serialInData;
                      //
                      serialInData = serial->readAll();
                      //
                      if(serialInData.length()!= 4 || serialInData[0] != 'a' || serialInData[3] != 'b')
                      {
                          
                          ErrorMessage("missing"); //this is my custom error debugger which shows message
                          serial->clear();
                          return;
                      }
                  
                      serData.bytes[0] =(unsigned char)serialInData[1];
                      serData.bytes[1] =(unsigned char)serialInData[2];
                  
                  
                      if(plotDataButtonStatus == true)
                      {
                          plotMainGraph(serData.integerPart);
                      }
                      serData.integerPart = 0;
                  }
                  
                  M Offline
                  M Offline
                  mostefa
                  wrote on last edited by
                  #8

                  @biomed12 said in QSerialPort data missing while reading:

                  @jsulm

                  ok, program side is:

                      serial->setBaudRate(QSerialPort::Baud57600);
                      serial->setStopBits(QSerialPort::TwoStop);
                      serial->setPortName("COM8");
                      serial->setDataBits(QSerialPort::TwoStop);
                      serial->setFlowControl(QSerialPort::NoFlowControl);
                      serial->setParity(QSerialPort::NoParity);
                  
                  

                  device side is:

                  ROM_UARTConfigSetExpClk(UART6_BASE,systemClock , baud,
                                              (UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_TWO|
                                               UART_CONFIG_PAR_NONE));
                  

                  Is your serialReadData() connected to readyRead signal ?

                  B 1 Reply Last reply
                  0
                  • B biomed12

                    0_1489099842910_upload-d6790b76-b33b-446f-905f-ac73d0a10bf4

                    This is my settings. I can read all data with labview. This is also my configuring code which get the definitions from gui.

                        serial->setPortName(p.name);
                        serial->setBaudRate(p.baudRate);
                        serial->setDataBits(p.dataBits);
                        serial->setFlowControl(p.flowControl);
                        serial->setParity(p.parity);
                        serial->setStopBits(p.stopBits);
                    

                    and how can i know if i get full frame of data or not?

                    M Offline
                    M Offline
                    mostefa
                    wrote on last edited by
                    #9

                    @biomed12 said in QSerialPort data missing while reading:

                    0_1489099842910_upload-d6790b76-b33b-446f-905f-ac73d0a10bf4

                    This is my settings. I can read all data with labview. This is also my configuring code which get the definitions from gui.

                        serial->setPortName(p.name);
                        serial->setBaudRate(p.baudRate);
                        serial->setDataBits(p.dataBits);
                        serial->setFlowControl(p.flowControl);
                        serial->setParity(p.parity);
                        serial->setStopBits(p.stopBits);
                    

                    and how can i know if i get full frame of data or not?

                    You can add a frame check sequence for example

                    https://en.wikipedia.org/wiki/Frame_check_sequence

                    1 Reply Last reply
                    1
                    • M mostefa

                      @biomed12 said in QSerialPort data missing while reading:

                      @jsulm

                      ok, program side is:

                          serial->setBaudRate(QSerialPort::Baud57600);
                          serial->setStopBits(QSerialPort::TwoStop);
                          serial->setPortName("COM8");
                          serial->setDataBits(QSerialPort::TwoStop);
                          serial->setFlowControl(QSerialPort::NoFlowControl);
                          serial->setParity(QSerialPort::NoParity);
                      
                      

                      device side is:

                      ROM_UARTConfigSetExpClk(UART6_BASE,systemClock , baud,
                                                  (UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_TWO|
                                                   UART_CONFIG_PAR_NONE));
                      

                      Is your serialReadData() connected to readyRead signal ?

                      B Offline
                      B Offline
                      biomed12
                      wrote on last edited by
                      #10

                      @mostefa

                      I am saying that data frame is broken, not data is not coming. İf the situation you say was true, there would not be any data. But I mention, there is frame drifting.

                      mrjjM 1 Reply Last reply
                      0
                      • B biomed12

                        @mostefa

                        I am saying that data frame is broken, not data is not coming. İf the situation you say was true, there would not be any data. But I mention, there is frame drifting.

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

                        @biomed12
                        Hi
                        Why not check with other serial app and see what coming ?
                        http://doc.qt.io/qt-5/qtserialport-terminal-example.html
                        If that works we can conclude its in app code and if it dont
                        something up with driver or serial port.
                        Last i would check if anything to do with Qt. :)
                        Its not very likely unless you compiled it yourself or have a very interesting distro.

                        1 Reply Last reply
                        0
                        • B biomed12

                          @jsulm

                          ok, program side is:

                              serial->setBaudRate(QSerialPort::Baud57600);
                              serial->setStopBits(QSerialPort::TwoStop);
                              serial->setPortName("COM8");
                              serial->setDataBits(QSerialPort::Data8);
                              serial->setFlowControl(QSerialPort::NoFlowControl);
                              serial->setParity(QSerialPort::NoParity);
                          
                             serial->setReadBufferSize(4);
                          
                          

                          device side is:

                          ROM_UARTConfigSetExpClk(UART6_BASE,systemClock , 57600,
                                                      (UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_TWO|
                                                       UART_CONFIG_PAR_NONE));
                          
                          ...
                          
                          //uart send function
                          void UARTSend(uint32_t ui32UARTBase, const uint8_t *pui8Buffer, uint32_t ui32Count)
                          {
                              while(ui32Count--)
                              {
                                  UARTCharPut(ui32UARTBase, *pui8Buffer++);
                          				
                          				while(!UARTBusy(ui32UARTBase))
                          				{
                          					
                          				}
                          	}	
                          }
                          ...
                          
                          //the data will be sended
                          	sendData[0] = 'a';
                          	sendData[1] = adcValue.bytes[0];
                          	sendData[2] = (adcValue.bytes[1] & 15);
                          	sendData[3] = 'b';
                          
                          //and send the data
                          UARTSend(UART6_BASE,sendData , 4);
                          
                          
                          

                          And I created a protocol. Data frame start with 'a' char and stop with 'b' char. So I added a control loop like below, but i get a lot of break frame. So, I discard the value in this situation but, the data is valueable for me. There are much broken frame...

                          union{
                              unsigned char bytes[2];
                              unsigned int integerPart;
                              unsigned char *ptr;
                          }serData;
                          
                          void MedicalSoftware::serialReadData()
                          {
                              QByteArray serialInData;
                              //
                              serialInData = serial->readAll();
                              //
                              if(serialInData.length()!= 4 || serialInData[0] != 'a' || serialInData[3] != 'b')
                              {
                                  
                                  ErrorMessage("missing"); //this is my custom error debugger which shows message
                                  serial->clear();
                                  return;
                              }
                          
                              serData.bytes[0] =(unsigned char)serialInData[1];
                              serData.bytes[1] =(unsigned char)serialInData[2];
                          
                          
                              if(plotDataButtonStatus == true)
                              {
                                  plotMainGraph(serData.integerPart);
                              }
                              serData.integerPart = 0;
                          }
                          
                          M Offline
                          M Offline
                          mostefa
                          wrote on last edited by mostefa
                          #12
                              serial->setBaudRate(QSerialPort::Baud57600);
                              serial->setStopBits(QSerialPort::TwoStop);
                              serial->setPortName("COM8");
                              serial->setDataBits(QSerialPort::TwoStop);
                              serial->setFlowControl(QSerialPort::NoFlowControl);
                              serial->setParity(QSerialPort::NoParity);
                          
                             serial->setReadBufferSize(4);
                          
                          

                          device side is:

                          ROM_UARTConfigSetExpClk(UART6_BASE,systemClock , 57600,
                                                      (UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_TWO|
                                                       UART_CONFIG_PAR_NONE));
                          

                          In your config ,are you sure about , serial->setDataBits(QSerialPort::TwoStop);?

                          setDataBits contains an enum and can be

                          QSerialPort::Data5
                          5
                          The number of data bits in each character is 5. It is used for Baudot code. It generally only makes sense with older equipment such as teleprinters.
                          QSerialPort::Data6
                          6
                          The number of data bits in each character is 6. It is rarely used.
                          QSerialPort::Data7
                          7
                          The number of data bits in each character is 7. It is used for true ASCII. It generally only makes sense with older equipment such as teleprinters.
                          QSerialPort::Data8
                          8
                          The number of data bits in each character is 8. It is used for most kinds of data, as this size matches the size of a byte. It is almost universally used in newer applications.

                          have a look at this enum from qt doc

                          http://doc.qt.io/qt-5/qserialport.html#DataBits-enum

                          So for me this should be :

                          serial->setDataBits(QSerialPort::Data8);

                          B 1 Reply Last reply
                          1
                          • M mostefa
                                serial->setBaudRate(QSerialPort::Baud57600);
                                serial->setStopBits(QSerialPort::TwoStop);
                                serial->setPortName("COM8");
                                serial->setDataBits(QSerialPort::TwoStop);
                                serial->setFlowControl(QSerialPort::NoFlowControl);
                                serial->setParity(QSerialPort::NoParity);
                            
                               serial->setReadBufferSize(4);
                            
                            

                            device side is:

                            ROM_UARTConfigSetExpClk(UART6_BASE,systemClock , 57600,
                                                        (UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_TWO|
                                                         UART_CONFIG_PAR_NONE));
                            

                            In your config ,are you sure about , serial->setDataBits(QSerialPort::TwoStop);?

                            setDataBits contains an enum and can be

                            QSerialPort::Data5
                            5
                            The number of data bits in each character is 5. It is used for Baudot code. It generally only makes sense with older equipment such as teleprinters.
                            QSerialPort::Data6
                            6
                            The number of data bits in each character is 6. It is rarely used.
                            QSerialPort::Data7
                            7
                            The number of data bits in each character is 7. It is used for true ASCII. It generally only makes sense with older equipment such as teleprinters.
                            QSerialPort::Data8
                            8
                            The number of data bits in each character is 8. It is used for most kinds of data, as this size matches the size of a byte. It is almost universally used in newer applications.

                            have a look at this enum from qt doc

                            http://doc.qt.io/qt-5/qserialport.html#DataBits-enum

                            So for me this should be :

                            serial->setDataBits(QSerialPort::Data8);

                            B Offline
                            B Offline
                            biomed12
                            wrote on last edited by
                            #13

                            @mostefa

                            sorry it was an error while editing the source code. it was like you mention

                            M 1 Reply Last reply
                            0
                            • B biomed12

                              @mostefa

                              sorry it was an error while editing the source code. it was like you mention

                              M Offline
                              M Offline
                              mostefa
                              wrote on last edited by mostefa
                              #14

                              @biomed12 said in QSerialPort data missing while reading:

                              @mostefa

                              sorry it was an error while editing the source code. it was like you mention

                              Just for information are you receiving a part of your data ?

                              Or you do not receive your data at all and receive another insignificant data?

                              1 Reply Last reply
                              0
                              • mrjjM Offline
                                mrjjM Offline
                                mrjj
                                Lifetime Qt Champion
                                wrote on last edited by mrjj
                                #15

                                Hi
                                Adding to @mostefa , your logic is not optimal ( in serialReadData)
                                serialInData = serial->readAll(); // this might not read all and next signal will override data already received.
                                //
                                if(serialInData.length()!= 4 || serialInData[0] != 'a' || serialInData[3] != 'b')

                                a more common design is

                                void MedicalSoftware::serialReadData()
                                {
                                //// -> this goes as memeber of class (.h file) QByteArray serialInData;
                                //
                                serialInData += serial->readAll(); // we ADD

                                if ( serialInData.size() >= COUNT_EXPECTED ) { // process
                                // check format etc
                                if(serialInData.length()!= 4 || serialInData[0] != 'a' || serialInData[3] != '
                                serialInData.clear();// clear buffer for next full read. Note if you have excess data u need to handle it here.

                                1 Reply Last reply
                                2
                                • M Offline
                                  M Offline
                                  mostefa
                                  wrote on last edited by mostefa
                                  #16

                                  Adding to what @mrjj said

                                  When readall is called you may received just part of your frame,

                                  For example , we are going to send "HELLO WORLD" on the serial port

                                  this can be sent in two times :

                                  at time t0 "HEL" is received
                                  at time t1 "O WORLD" is received

                                  If you are doing your readall, at time t0 you can receive just part of data

                                  To avoid this you can use readyRead signal, and QByteArray buffer

                                  connect(nameOfyourSerialPort,SIGNAL(readyRead(),this,SLOT(onPartOfFrameAvailable());
                                  
                                  QByteArray mWholeData;//var member this is our buffer
                                  
                                  void onPartOfFrameAvailable()
                                  {
                                       mWholeData.append(nameOfyourSerialPort->readAll());
                                       qDebug() << "for the moment wholeData contains" << mWholeData;
                                  }
                                  

                                  If you send "HELLO WORLD" the result will be for example:

                                  First output : for the moment wholedata contains "HEL";
                                  Second output : for the moment wholedata contains "HELLO WORL"
                                  Thirs output : for the moment wholedata contains "HELLO WORLD";

                                  1 Reply Last reply
                                  1
                                  • B Offline
                                    B Offline
                                    biomed12
                                    wrote on last edited by biomed12
                                    #17

                                    @mostefa
                                    Yes, I have this trouble definitely. I will try and share the results.

                                    M 1 Reply Last reply
                                    0
                                    • B biomed12

                                      @mostefa
                                      Yes, I have this trouble definitely. I will try and share the results.

                                      M Offline
                                      M Offline
                                      mostefa
                                      wrote on last edited by
                                      #18

                                      @biomed12 said in QSerialPort data missing while reading:

                                      Yes, I have this trouble definitely. I will try and share the results.

                                      Ok keep us informed ;)

                                      B 1 Reply Last reply
                                      0
                                      • M mostefa

                                        @biomed12 said in QSerialPort data missing while reading:

                                        Yes, I have this trouble definitely. I will try and share the results.

                                        Ok keep us informed ;)

                                        B Offline
                                        B Offline
                                        biomed12
                                        wrote on last edited by
                                        #19

                                        @mostefa said in QSerialPort data missing while reading:

                                        @biomed12 said in QSerialPort data missing while reading:

                                        Yes, I have this trouble definitely. I will try and share the results.

                                        Ok keep us informed ;)

                                        ooppss.. Qbyte array is getting larger always.

                                        M 1 Reply Last reply
                                        0
                                        • B biomed12

                                          @mostefa said in QSerialPort data missing while reading:

                                          @biomed12 said in QSerialPort data missing while reading:

                                          Yes, I have this trouble definitely. I will try and share the results.

                                          Ok keep us informed ;)

                                          ooppss.. Qbyte array is getting larger always.

                                          M Offline
                                          M Offline
                                          mostefa
                                          wrote on last edited by
                                          #20

                                          @biomed12 said in QSerialPort data missing while reading:

                                          @mostefa said in QSerialPort data missing while reading:

                                          @biomed12 said in QSerialPort data missing while reading:

                                          Yes, I have this trouble definitely. I will try and share the results.

                                          Ok keep us informed ;)

                                          ooppss.. Qbyte array is getting larger always.

                                          Getting larger than what?

                                          I don't understand could you provide more details please?

                                          B 1 Reply Last reply
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