Hi, I'm running into an issue using a serial port on Linux, and trying to set a custom baud rate. When I started having the issue I was using Qt 5.9.3; I've since updated to 5.9.4 but am having the same issue. The second argument is the baud rate. Valid values for this argument are 1200, 2400, 4800, 9600, 19200, 38400 and 76800. This function returns TRUE if successful. + * You should have received a copy of the GNU Lesser General Public.
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I am creating a script in QT for reading the format packages (AA), (BB), etc from serial port. I open the serial port, but when I go to check inside the QByteArray values, comes back that I could not read any value.
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Serial Baud Rates Table
This is my code
1 Answer
You called readAll() immediately after open(). It probably took the computer a few nanoseconds to get from one to the other.
At 9600 baud, each byte of data takes slightly more than one millisecond to transfer. It would be absolutely impossible for any data to have arrived in that short an interval, so that's why you got no data.
Serial ports don't begin buffering incoming data until you open them (how could they, what baud rate and other settings would be used for receiving and buffering when no program has the port open?)
Use either a blocking read function of some sort (such as readLine()) or an event loop that reacts to data when it arrives.
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