From: Simon Clubley <clubley@remove_me.eisner.decus.org-Earth.UFP>
Subject: Re: GNAT.Serial_Communications
Date: Tue, 19 Apr 2011 13:32:34 +0000 (UTC)
Date: 2011-04-19T13:32:34+00:00 [thread overview]
Message-ID: <iok2th$cpe$1@dont-email.me> (raw)
In-Reply-To: be0e8769-2eb5-46ae-9f8c-416764e69e88@j35g2000prb.googlegroups.com
On 2011-04-19, tonyg <tonythegair@gmail.com> wrote:
>
> Just to let you all know ( I'm sure the world was waiting with baited
> breath!) that thanks to the help received, its now all working. I'll
> document what the problem was with some additional stuff to let future
> people know.
>
> It was the flow control setting and it can be fixed by opening another
> terminal window and using the command
>
> stty --file=/dev/ttyUSB0 -crtscts
>
> However - any ada program compiled with the gnat serial communications
> package if run again will reset the port to add flow control so this
> needs it will need to be done again. Which is unfortunate for me and
Interesting. I would not expect that; there may be something resetting
the port (maybe in the GNAT library or the version of the Linux kernel you
are using) without you realising it as I don't recall seeing that while
working with Linux serial ports (which, for the set of applications in
question, I do in C and not Ada).
> anyone with non flow control electronics. I expect this will occur
> everytime the port is opened. Out of interest do all you serial port
> tinkerers out there use flow control?
Yes. It's a hardware based RTS/CTS flow control setup and it's a integral
part of my microcontroller UART library (at least for the hardware UART;
I also created a Tx only software UART for my library and I don't support
flow control on that as it's just used for debugging).
This is for microcontroller to microcontroller communications however.
When I connect the devices to the Linux PC, I use the standard MAX232
setup and since it's been a number of months since I last did this, I
cannot remember if my library supports inverting the RTS/CTS lines
to allow the signals to pass through the MAX232 or if I just disable
the flow control on both sides as I am generally just debugging.
Given that I need to transmit 8 bit data on these ports, I have not
bothered creating a software flow control Xon/Xoff implementation.
Simon.
--
Simon Clubley, clubley@remove_me.eisner.decus.org-Earth.UFP
Microsoft: Bringing you 1980s technology to a 21st century world
next prev parent reply other threads:[~2011-04-19 13:32 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-11 10:26 GNAT.Serial_Communications tonyg
2011-04-11 11:11 ` GNAT.Serial_Communications Brian Drummond
2011-04-13 7:49 ` GNAT.Serial_Communications tonyg
2011-04-13 14:12 ` GNAT.Serial_Communications Alex Mentis
2011-04-13 21:12 ` GNAT.Serial_Communications tonyg
2011-04-14 13:15 ` GNAT.Serial_Communications Alex Mentis
2011-04-14 17:52 ` GNAT.Serial_Communications Chris Moore
2011-04-15 13:58 ` GNAT.Serial_Communications tonyg
2011-04-15 16:32 ` GNAT.Serial_Communications tonyg
2011-04-15 17:12 ` GNAT.Serial_Communications Simon Clubley
2011-04-15 17:32 ` GNAT.Serial_Communications tonyg
2011-04-15 18:49 ` GNAT.Serial_Communications Simon Clubley
2011-04-16 0:07 ` GNAT.Serial_Communications tonyg
2011-04-16 8:29 ` GNAT.Serial_Communications Simon Clubley
2011-04-16 10:19 ` GNAT.Serial_Communications tonyg
2011-04-16 10:33 ` GNAT.Serial_Communications tonyg
2011-04-16 11:15 ` GNAT.Serial_Communications Brian Drummond
2011-04-16 12:03 ` GNAT.Serial_Communications tonyg
2011-04-16 15:12 ` GNAT.Serial_Communications Simon Clubley
2011-04-18 20:31 ` GNAT.Serial_Communications tonyg
2011-04-18 20:43 ` GNAT.Serial_Communications tonyg
2011-04-19 11:46 ` GNAT.Serial_Communications tonyg
2011-04-19 12:09 ` GNAT.Serial_Communications Ludovic Brenta
2011-04-19 13:53 ` GNAT.Serial_Communications tonyg
2011-04-19 19:06 ` GNAT.Serial_Communications Ludovic Brenta
2011-04-19 19:57 ` GNAT.Serial_Communications Alex Mentis
2011-04-20 11:37 ` GNAT.Serial_Communications tonyg
2011-04-20 14:22 ` GNAT.Serial_Communications Alex Mentis
2011-04-21 9:00 ` GNAT.Serial_Communications tonyg
2011-04-21 13:28 ` GNAT.Serial_Communications Alex Mentis
2011-04-22 13:55 ` GNAT.Serial_Communications Alex Mentis
2011-04-22 15:52 ` GNAT.Serial_Communications Brian Drummond
2011-04-19 13:32 ` Simon Clubley [this message]
2011-04-19 16:59 ` GNAT.Serial_Communications Simon Clubley
2011-04-20 10:17 ` GNAT.Serial_Communications Brian Drummond
2011-04-20 20:46 ` GNAT.Serial_Communications Brian Drummond
2011-04-21 4:28 ` GNAT.Serial_Communications Simon Wright
2011-04-21 9:12 ` GNAT.Serial_Communications tonyg
2011-04-21 10:14 ` GNAT.Serial_Communications tonyg
2011-04-22 15:54 ` GNAT.Serial_Communications Brian Drummond
2011-04-22 16:14 ` GNAT.Serial_Communications Simon Wright
2011-04-21 11:56 ` GNAT.Serial_Communications Simon Clubley
2011-04-15 18:01 ` GNAT.Serial_Communications Jeffrey Carter
2011-04-16 10:21 ` GNAT.Serial_Communications tonyg
2016-12-01 19:58 ` GNAT.Serial_Communications mario.blunk.gplus
2017-03-20 15:20 ` GNAT.Serial_Communications Jacob Sparre Andersen
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