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From: tonyg <tonythegair@gmail.com>
Newsgroups: comp.lang.ada
Subject: GNAT.Serial_Communications
Date: Mon, 11 Apr 2011 03:26:38 -0700 (PDT)
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Date: 2011-04-11T03:26:38-07:00
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I have been using this package in code which receives and sends
messages across a serial interface to some electronics.

Unfortunately my task being locked on the
GNAT_Serial_Communications.write call with no error or exception.
I opened the port with these options

At first I opened this port with
      GNAT.Serial_Communications.Open (Port => the_port, Name => "/dev/
ttyUSB0");
      GNAT.Serial_Communications.Set (Port => the_port,
                                      Rate =>
GNAT.Serial_Communications.B115200,
                                      Bits =>
GNAT.Serial_Communications.CS8,
                                      Parity =>
GNAT.Serial_Communications.None);

I have also tried a half second timeout by opening the port with this

      GNAT.Serial_Communications.Open (Port => the_port, Name => "/dev/
ttyUSB0");
      GNAT.Serial_Communications.Set (Port => the_port,
                                      Rate =>
GNAT.Serial_Communications.B115200,
                                      Bits =>
GNAT.Serial_Communications.CS8,
                                      Parity =>
GNAT.Serial_Communications.None,
                                      Timeout => 0.5);

Unfortunately the write call is still indefinetely locking and the
timeout does not seem to apply to writes. Some over things of note are
that I am beginning the write string with a '$' and the end of the
string with a ASCII.cr, is anyone able to shed any light on  this ?