[9fans] serial port programming

[9fans] serial port programming

[Sam Ducksworth]

i would like to write a simple plan9
program that i can use to pull serial
data from a microcontroller based data
logger that i have constructed. does
anyone know where i could find some
sample code that shows how plan9
handles serial port I/O.

-sam

Re: [9fans] serial port programming

[anothy]

in addition to the excelent suggestions already
offered, it sounds like consolefs(4) might be of
interest. it (and clog, on the same page) handles
multiple readers and writers to a set of serial
consoles and (optionally) logging them to files.
it is, of cource, focused on text consoles, but
may be a good starting point.
-α.

Re: [9fans] serial port programming

[rog]

>	look at /sys/src/cmd/ip/ppp/ppp.c:2437,2451

a pity that file only has 2433 lines...

Re: [9fans] serial port programming

[presotto]

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Guess he'll have to wait till next release then...

I'll put the current version on the update page.

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From: rog@vitanuova.com
To: 9fans@cse.psu.edu
Subject: Re: [9fans] serial port programming
Date: Thu, 15 Feb 2001 22:37:39 0000
Message-ID: <20010215213250.DC734199D5@mail.cse.psu.edu>

>	look at /sys/src/cmd/ip/ppp/ppp.c:2437,2451

a pity that file only has 2433 lines...

Re: [9fans] serial port programming

[presotto]

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Short answer:

	cat /dev/eia0

Longer answer:

	look at /sys/src/cmd/ip/ppp/ppp.c:2437-2451

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I know the world of computing has forsworn manuals
for a variety of reasons, but it's a valid approach in
Plan 9.

So, read uart(3) first. It explains how to configure
a uart by opening the ctl file and writing simple
strings. You read and write it by reading and writing the
data file. As they used to say on a game show here,
"that's all there is to it".

If you need more, then try

src con

the source of the terminal emulator.


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From: Sam Ducksworth <sam@ducksworth.com>
To: 9fans mailing list <9fans@cse.psu.edu>
Subject: [9fans] serial port programming
Date: Thu, 15 Feb 2001 09:10:07 -0800
Message-ID: <3A8C0D6F.17395EC2@ducksworth.com>

i would like to write a simple plan9
program that i can use to pull serial
data from a microcontroller based data
logger that i have constructed. does
anyone know where i could find some
sample code that shows how plan9
handles serial port I/O.

-sam

Re: [9fans] serial port programming

[Sam Ducksworth]

thanks nigel,

nigel@9fs.org wrote:
>
> I know the world of computing has forsworn manuals
> for a variety of reasons, but it's a valid approach in
> Plan 9.

i have no problem with RTFMing. i was just
RTFMing in the wrong place. being a unix guy
i found myself searching for tty and term
related man pages.

>
> So, read uart(3) first. It explains how to configure
> a uart by opening the ctl file and writing simple
> strings. You read and write it by reading and writing the
> data file. As they used to say on a game show here,
> "that's all there is to it".

wow. it really is easy.

>
> If you need more, then try
>
> src con
>
> the source of the terminal emulator.

Re: [9fans] serial port programming

[nigel]

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I know the world of computing has forsworn manuals
for a variety of reasons, but it's a valid approach in
Plan 9.

So, read uart(3) first. It explains how to configure
a uart by opening the ctl file and writing simple
strings. You read and write it by reading and writing the
data file. As they used to say on a game show here,
"that's all there is to it".

If you need more, then try

src con

the source of the terminal emulator.


[-- Attachment #2: Type: message/rfc822, Size: 1693 bytes --]

From: Sam Ducksworth <sam@ducksworth.com>
To: 9fans mailing list <9fans@cse.psu.edu>
Subject: [9fans] serial port programming
Date: Thu, 15 Feb 2001 09:10:07 -0800
Message-ID: <3A8C0D6F.17395EC2@ducksworth.com>

i would like to write a simple plan9
program that i can use to pull serial
data from a microcontroller based data
logger that i have constructed. does
anyone know where i could find some
sample code that shows how plan9
handles serial port I/O.

-sam