I'm trying to write read from a serial device using a usb / rs 232 cable.I'm pretty sure that my code writes ' #002s ' (this is a control code) to the serial device, because

a) the serial port is open

b) the serial port is writable

c) the code successfully navigates 'wait For Bytes Written (-1)'

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d) when using a serial port sniffer the data is successfully written.

The issue I have is that I don't receive any data, and no data is being emitted from the other device. When using qt terminal writing the same ' #002s ' produces the correct response.

Any ideas?

many thanks.

2 Answers

1. If you want to write ' #002s ', Why not write at once? May be the serial device cant identify the control code when you write each character.

2. And no need for this reading part .

   The Test_Serial::serialReceived will be called any way when you have the response from the serial device.

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3. And you can catch the error on opening the port by using the errorsignal from QSerialPort

The issue ended up being that the readyread flag is only emitted if theirs data to read. However I was sending the data too quickly for the external device to receive it. This meant that some data was lost thus the device never recognised it as a valid command.

This meant that it was still waiting for the message to finish, hence the 'IRP_MJ_DEVICE_CONTROL (IOCTL_SERIAL_WAIT_ON_MASK) UP STATUS_CANCELLED COM1' error message upon closing the program. This also explains why their were no error messages with regards to writing data.

This also explains why the same program occasionally managed to read data, and at other times failed, (even without rebuilding the program, just re-running it.) When the data was read, the processor was more loaded, i.e. programs running in the background. This meant that the data was transmitted more slowly and thus the external device could recognise the commands and thus reply.

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I am trying to connect a signal and a slot in C++ using the boost libraries. My code currently opens a file and reads data from it. However, I am trying to improve the code so that it can read and analyze data in real time using a serial port. What I would like to do is have the analyze functions called only once there is data available in the serial port.

How would I go about doing this? I have done it in Qt before, however I cannot use signals and slots in Qt because this code does not use their moc tool.

1 Answer

Your OS (Linux) provides you with the following mechanism when dealing with the serial port.

You can set your serial port to noncanonical mode (by unsetting ICANON flag in termios structure). Then, if MIN and TIME parameters in c_cc[] are zero, the read() function will return if and only if there is new data in the serial port input buffer (see termios man page for details). So, you may run a separate thread responsible for getting the incoming serial data:

The main idea here is that the thread calling read() is going to be active only when new data arrives. The rest of the time OS will keep this thread in wait state. Thus it will not consume CPU time. It is up to you how to implement the actual signal part.

The example above uses regular read system call to get data from port, but you can use the boost class in the same manner. Just use syncronous read function and the result will be the same.

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