1. Setting Serial Port Baud Rate

Index: qt/qtserialport.git. Qt Serial Port support: summary refs log tree commit diff stats. BAUD_RATE_GEN_FREQ / DEFAULT_BAUD_RATE). That's why I tried two different libraries for the Qt serial interface as well as. Could someone please try those two sketches at a high Baud rate?

Provides information about existing serial ports. More..

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Public Functions

Static Public Members

Detailed Description

Provides information about existing serial ports.

Use the static functions to generate a list of QSerialPortInfo objects. Each QSerialPortInfo object in the list represents a single serial port and can be queried for the port name, system location, description, and manufacturer. The QSerialPortInfo class can also be used as an input parameter for the setPort() method of the QSerialPort class.

See also QSerialPort.

Member Function Documentation

QSerialPortInfo::QSerialPortInfo()

Constructs an empty QSerialPortInfo object.

See also isNull().

QSerialPortInfo::QSerialPortInfo(const QSerialPort &port)

Constructs a QSerialPortInfo object from serial port.

QSerialPortInfo::QSerialPortInfo(const QString &name)

Constructs a QSerialPortInfo object from serial port name.

This constructor finds the relevant serial port among the available ones according to the port name name, and constructs the serial port info instance for that port.

QSerialPortInfo::QSerialPortInfo(const QSerialPortInfo &other)

Setting Serial Port Baud Rate

Constructs a copy of other.

QSerialPortInfo::~QSerialPortInfo()

Destroys the QSerialPortInfo object. References to the values in the object become invalid.

[static] QList<QSerialPortInfo> QSerialPortInfo::availablePorts()

Returns a list of available serial ports on the system.

QString QSerialPortInfo::description() const

Returns the description string of the serial port, if available; otherwise returns an empty string.

See also manufacturer() and serialNumber().

bool QSerialPortInfo::hasProductIdentifier() const

Returns true if there is a valid 16-bit product number present; otherwise returns false.

See also productIdentifier(), vendorIdentifier(), and hasVendorIdentifier().

bool QSerialPortInfo::hasVendorIdentifier() const

Returns true if there is a valid 16-bit vendor number present; otherwise returns false.

See also vendorIdentifier(), productIdentifier(), and hasProductIdentifier().

bool QSerialPortInfo::isBusy() const

Returns true if serial port is busy; otherwise returns false.

See also isNull().

bool QSerialPortInfo::isNull() const

Returns whether this QSerialPortInfo object holds a serial port definition.

See also isBusy().

QString QSerialPortInfo::manufacturer() const

Returns the manufacturer string of the serial port, if available; otherwise returns an empty string.

See also description() and serialNumber().

QString QSerialPortInfo::portName() const

Returns the name of the serial port.

See also systemLocation().

quint16 QSerialPortInfo::productIdentifier() const

Returns the 16-bit product number for the serial port, if available; otherwise returns zero.

See also hasProductIdentifier(), vendorIdentifier(), and hasVendorIdentifier().

QString QSerialPortInfo::serialNumber() const

Returns the serial number string of the serial port, if available; otherwise returns an empty string.

Note: The serial number may include letters.

This function was introduced in Qt 5.3.

See also description() and manufacturer().

[static] QList<qint32> QSerialPortInfo::standardBaudRates()

Returns a list of available standard baud rates supported by the target platform.

void QSerialPortInfo::swap(QSerialPortInfo &other)

Swaps QSerialPortInfoother with this QSerialPortInfo. This operation is very fast and never fails.

QString QSerialPortInfo::systemLocation() const

Returns the system location of the serial port.

See also portName().

quint16 QSerialPortInfo::vendorIdentifier() const

Returns the 16-bit vendor number for the serial port, if available; otherwise returns zero.

See also hasVendorIdentifier(), productIdentifier(), and hasProductIdentifier().

QSerialPortInfo &QSerialPortInfo::operator=(const QSerialPortInfo &other)

Sets the QSerialPortInfo object to be equal to other.

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I'm attempting to set a custom baud rate of 10400 to my device on Linux using Qt. However, when I run the application, the console output keeps reporting that

Baud rate of serial port /dev/ttyUSB0 is set to 10403 instead of 10400: divisor 2307.692383 unsupported

I've also set the data bits to 8, parity to no parity, and stop bits to 1, which are pretty standard.

Here's my code by the way:

When I run the application on Windows however, it works totally fine.

My device isn't able to connect with any other baud rate other than 10400. The application is able to compile and run, however the result is all garbage. I want to know if there's a way where I can specify this baud rate without any problems?

2 Answers

Relevant bug report here. Basically it means, that the exact baud rate is not available, because the actual thing configured to hardware is an integer divisor of some clock frequency, and there is no exact integer divisor for the requested baud rate. The warning message is pretty descriptive about this.

It shouldn't matter, baud rates have some tolerance, but if it does cause problems (discussion under bug suggests it may..), upgrading to Qt 5.6 is suggested in the bug report.

That's a warning; it means you should fix the code, but the code still happens to work. What you're trying to do is not supported by the hardware you run on. Windows is only quieter about this, it doesn't support it either.

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