[Lazarus] Using 5dpo for serial comm...

[Mark Morgan Lloyd]

Bo Berglund wrote:
> I'm sorry to bother you again but I can't grip the serial posrt
> handling at all....
> I have installed 5dpo serial component in Lazarus on Ubuntu 10 (a
> virtual machine in VMWare, which uses the host COM1 serial port) and
> tried the following test:
> 
> - Created a form with an Open/Close button, an edit box and a listbox.
> - Added a 5dpo serial component to the form and set it to 9600 baud.
> - Also set it to use ttyS0 (which I assume translates to the first
> serial port in Linux)
> - Implemented a button click event to open/close the port
> - Implemented a button click event to send the editbox text out
> - Implemented an RxData event to put incoming text into the listbox
> - Connected the serial port used by the Ubuntu VM to the other port on
> the PC using a null terminal cable.
> - In Windows I started Hyperterminal on the second port
> 
> My test program was started in Ubuntu and I clicked the Open button,
> then entered text in the editbox and clicked the send button.
> Nothing appeared in Hyperterminal...
> 
> Tried typing into hyperterminal, but nothing appeared in the program
> listbox either.
> 
> If I now close the port with my button and then try to open it again
> there is an exception that forces the program to end.

Check port ownership, the groups the current user is in, and look at 
dmesg output.

-- 
Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk

[Opinions above are the author's, not those of his employers or colleagues]