uart1 works via serial debugger, but not via UART1_TXD P9_24 pin

[Andrey Shmelev]

I Need help, 

uart1 works via serial debugger, but not via UART1_TXD 24 and 26 pins, 

also other UARTs not work. 

Working via BEAGLEBONE BLACK SERIAL DEBUG CONNECTION is not good for me because always appeared different messages,

and i want to work only with UART1 or Uart4 on P9 Connector.

there is my code (works via serial debugger connector)

foreach (const QSerialPortInfo &info, QSerialPortInfo::availablePorts()) {

        QSerialPort serial;

        serial.setPort(info);

        if (serial.open(QIODevice::ReadWrite))

        {

            serial.setBaudRate(QSerialPort::Baud9600);

            serial.setDataBits(QSerialPort::Data8);

            serial.setParity(QSerialPort::NoParity);

            serial.setStopBits(QSerialPort::OneStop);

            serial.setFlowControl(QSerialPort::NoFlowControl);

            ui->label_7->setText(ui->label_7->text()+" " + serial.portName());

            serial.write("321");

            QTime dieTime= QTime::currentTime().addSecs(0.2);

            while (QTime::currentTime() < dieTime)

                QCoreApplication::processEvents(QEventLoop::AllEvents, 100);

            QByteArray data = serial.readAll();

            QString DataAsString = (QString(data.toHex()));

            dieTime= QTime::currentTime().addSecs(2);

            while (QTime::currentTime() < dieTime)

               QCoreApplication::processEvents(QEventLoop::AllEvents, 100);

           ui->label_4->setText(QString::number(serial.bytesAvailable()));

            dieTime= QTime::currentTime().addSecs(0.2);

            while (QTime::currentTime() < dieTime)

                QCoreApplication::processEvents(QEventLoop::AllEvents, 100);

            serial.close();

        }

    }

Any thoughts?

thanks!!!

[TJF]

Hi Andrey,

did you try a 3V3 connection (J1 is 5V, the other UARTs are 3V3).

Regards

[evilwulfie]

All connections to the Signals on the BBB are 3v3 volts.

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[TJF]

Am Freitag, 9. Dezember 2016 17:07:02 UTC+1 schrieb Wulf Man:

All connections to the Signals on the BBB are 3v3 volts.

Yes, all. Except USB, J1, ...