Qt Serial Port Example Serial Port At

Qt Serial Port Example Serial Port At

Qt Serial Port Example Serial Port At My program should be able to read from serial port at Mini2440 FriendlyARM processor.

As you know, new computers and laptops dont have serial port so I try to simulate serial port programming using hand-made USB-to-serial adapter cable.

When the USB serial cable is plugged in, it is recognized as devttyUSB0 on Ubuntu.

Please note, the other end of cable (the serial port) isnt connected to anything.

I try to wrote to devttyUSB0 each 10 seconds and read the data.

The strange thing is notifAreaPort.error() returns 0, and it means no error.

Set up a QTimer with a timeout of around 50 ms or so (depends on hardware).

Typical serial reads are small and of short time duration so UI freezing rarely happens using these methods.

I think its a good idea to connect PIN 2(Rx) and 3(Tx), so you getting data.

I use for serial ports always the readyRead() signal and I check before reading with port-bytesAvailable().

Just to test serial port reading and writing, is it OK, one end of serial cable connected to Laptop and another end unconnected to device (whatever serial device).

That is how the API was sadly designed, but we are in the process of revamping it.

In short: you are basically trying to read before the write potentially even finished.

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