Re: GNAT.Serial_Communications

[tonyg <tonythegair@gmail.com>]

On Apr 16, 9:29 am, Simon Clubley <clubley@remove_me.eisner.decus.org-
Earth.UFP> wrote:
> On 2011-04-15, tonyg <tonytheg...@gmail.com> wrote:
>
>
>
> > This is making a lot of sense to me. Minicom is working perfectly with
> > setting the commands on the electronics. However for some reason, the
> > same commands relayed by the ada program are simply not received.
>
> > There does not seem a way in GNAT.Serial_Communications to disable
> > hardware and software flow control, I'll have a look at how linux does
> > it.
>
> Have you compared the _full_ output from stty yet when Minicom and your
> program are running ?
>
> As I mention above, there are other possible failure modes and the full
> output from stty will tell you if flow control is enabled on the port or
> not. Checking the flow control is just the first thing I would check;
> it is not the only thing.
>
> Read the man page for stty. :-) You may save yourself quite a bit of time
> if the flow control settings are not the problem.
>
> Simon.
>
> --
> Simon Clubley, clubley@remove_me.eisner.decus.org-Earth.UFP
> Microsoft: Bringing you 1980s technology to a 21st century world

This is the full output when minicom is running

tony@tony-workstation:~$ stty --file=/dev/ttyUSB0
speed 115200 baud; line = 0;
eof = ^A; min = 1; time = 5;
ignbrk -brkint -icrnl -imaxbel
-opost -onlcr
-isig -icanon -iexten -echo -echoe -echok -echoctl -echoke
tony@tony-workstation:~$

This is the full output when the ada program is running

tony@tony-workstation:~$
tony@tony-workstation:~$ stty --file=/dev/ttyUSB0
speed 115200 baud; line = 0;
eof = ^A; min = 0; time = 100;
-brkint -icrnl -imaxbel
-opost -onlcr
-isig -icanon -iexten -echo -echoe -echok -echoctl -echoke
tony@tony-workstation:~$

The differences are ignbrk flag is up on the minicom readout and min
=1. I assume the time=100 bit is from the timeout parameter set
procedure in gnat.serial_communication.

Another thing occurred to me is that do I need to open the same port
twice for my read calls and my write calls. i.e. have two variables

read_port, write_port : gnat.serial_communications.serial_port;

which both open ttyUSB0 ? or I am barking up the wrong tree