Marc Santhoff wrote:
Am Freitag, den 21.04.2006, 22:28 +0100 schrieb Ian bell:
I am just starting to port some programs to fpc using Lazarus form
Tcl/Tk. I have some questions about things I can do fairly easily in
Tcl/Tk which I am not sure how to achieve in fpc/lazarus. At present I
only need Linux specific answers.
1. I am connecting to an external microcontoller development board by
a serial interface. I need to be able to set this interface non
blocking. I can see how to open the serial interface using the serial
unit but it is not clear how to set it non blocking.
For Linux/*nix there is the "serial" unit, does something similar here.
See
<fpc-source-dir>/rtl/unix/serial.pp
Yes, as I mentioned above I looked at the 'serial' unit. It seems to
basicaly call fpopen as expected. To set the serial port paramaters,
which includes blocking, a call to ioctl is normaly needed which
appears to be implemented by a call to tcsetattr which I assume is in
the termio unit. I have now tracked this down and the tcsetattr seems
to be inplemented by a cal to fpioctl -surprise surprise! The only
other unit used by termio is BaseUnix. However I can only find
baseunix.ppu in the source tree - is there some utility that can make
these human readable?
2. I need to respond to the occurence of input on the serial port.
This is trivial in Tcl - fileevent FileDescriptor FunctionName - how
do I achieve this in fpc?
Hum, not sure about this, but maybe a "select" on the port will help?
Another possibility would be to watch the status lines (in a separate
thread if necessary) or simply the input data ... depend on what event
you're waiting for.
I think this is an additional filed in the termios structure which I
gues is the same as the one used in C.
3. In Tcl/Tk I use a textarea widget with keyboard entry disabled to
show progress and data. The nearest equivalent in LCL seems to be
TMemo. How do I disable keyboard input to this and where can I find
documentation on this and other) components - the wiki seems fairly
silent on this or do I just assume it work like a Delphi TMemo?
I think setting the property "ReadOnly" to TRUE should do.
Most people seem to use Delphis docs because they have used it before
trying fpc/lazarus. For the basics mostly any doc about Delphi/Object
Pascal would do (from the web, cheap books, ...).
That's handy; I stopped using Deplhi at V3 but I still have the books.
Thanks for the help.
Ian
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