> Hi list, > I am trying to communicate via serial port with a device that use > 125000 bps. > When I set the custom baud rate the setBaudRate return true without > error (I also check with debugger and the QSerialPortPrivateData > inputBaudRate and outputBaudRate are properly set to 125000). > But when I check with an oscilloscope the frequency of bits that came > out from serial port the result is that the port is set to 115200... > After sending data through serial port I print the port baudRate() and > the value is even set to 125000. > > I am using Qt 4.8.4 (for project reason) under linux. > > Any ideas about this problem?
Is your serial port capable of emitting at a baud rate of 125kbaud? UARTs often produce the requested baud rate by dividing an internal oscillator by an integer number. As such, they can only attain a fixed set of baud rates. For instance, an internal oscillator at 460KHz can be divided by 4 to emit at 115kbaud but it cannot generate a clock at 125kbaud. I have seen drivers that reports an error if the requested baud rate is unavailable while other silently selects the closest attainable baud rate. Frederic _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
