Reading serial port with Perl
PčéJäy
I need a simple way to get the input from a serial port one line at a time
and put it into a variable, using Perl.
I've searched Google for the last 30 mins or so but everything is too
complicated for me to understand... I don't have much experience with perl.
Any examples/pointers would be much appreciated!!
Paul.j
PčéJäy
"zentara" <zen...@highstream.net> wrote in message
news:lffg50521nlousijr...@4ax.com...
> I found this googling once before, but I can't find the link again, so
> I will just show it.
> #!/usr/bin/perl
>
> #the ubiquitous RS-232 Serial Port. built an interface
> #for my Aware Electronics Geiger Counter (RM-70) that
> #used a Basic Stamp IISX chip set. Every 20 seconds it
> #would spit out an ASCII string of radiation and
> #temperature data. I had hunted around for examples
> #using the Device::SerialPort module and found many.
> #Most were copies of code used to read PBX data. But
> #it wouldn't work. Ouch. Finally, after much research
> #I realized that - by golly - you had to terminate
> #the IO with a new line and not a carriage return.
> #Oddly doing a cat </dev/ttyS0 worked, which faked me
> #out. So I added the line in the tty setup below that
> #converts CR to NL and zap-ity-do-dah it started terminating
> #and sending each read. Long live RS-232. Please send
> #along any suggestions and improvements. This also probably
> #explains why I had failed to get good reads from a
> #cheap-o RS-232 capable DVM a few years ago.
>
> #This was done in Perl 5.8.0 under RH Linux 9.0.
>
> #file geiger.pl
> #
> # Author: David Drake
> # Date: July 18, 2003
> # Requirements: Device::SerialPort 0.22 (from cpan July 2003)
> #
> # Version: 1.0
> #This script is used to read a serial port to obtain data from a
> #combined Geiger counter and temperature sensor.
> #The Geiger Counter is an Aware Electronics RM-70 unit. Each count
> #maps to one microR per hour. The RM-70 pulse output is sent to a
> #Basic Stamp-IISX microcontroller. The BS2SX accumulates counts for 20
> #seconds and then sends a serial data stream out of its serial port.
> #The data stream goes into the input serial port on the Linux system.
> #This program then tabulates the data to a log file.
>
> use Device::SerialPort;
> use Time::gmtime;
>
> $LOGDIR = "/home/zentara/perlplay/serial-comm"; # path to data file
> $LOGFILE = "geiger.log"; # file name to output to
> $PORT = "/dev/ttyS1"; # port to watch
>
> #
> #
> # Serial Settings
> #
>
> #make the serial port object
> #note the need to convert carriage returns to new lines to terminate
> each
> #read.
>
> $ob = Device::SerialPort->new($PORT) || die "Can't Open $PORT: $!";
>
> $ob->baudrate(9600) || die "failed setting baudrate";
> $ob->parity("none") || die "failed setting parity";
> $ob->databits(8) || die "failed setting databits";
> $ob->stty_icrnl(1) || die "failed setting convert cr to new line";
> $ob->handshake("none") || die "failed setting handshake";
>
> $ob->write_settings || die "no settings";
>
> #
> # open the logfile, and Port
> #
>
> open( LOG, ">>${LOGDIR}/${LOGFILE}" )
> || die "can't open smdr file $LOGDIR/$LOGFILE for append: $SUB $!\n";
>
> select(LOG), $| = 1; # set nonbuffered mode, gets the chars out NOW
>
> open( DEV, "<$PORT" ) || die "Cannot open $PORT: $_";
>
> #
> # Loop forver, logging data to the log file
> #
>
> while ( $_ = <DEV> ) { # print input device to file
> $gmc = gmctime();
> print LOG $gmc, " ", $_;
> }
>
> undef $ob;
>
> #we are done dude
> __END__
>
>
>
> --
> I'm not really a human, but I play one on earth.
> http://zentara.net/japh.html
Grant Edwards
> Brilliant!!! Thanks.
[100+ lines clipped]
You had to quote all 100+ lines just to add that? I guess what
they say about Perl is right...
--
Grant Edwards grante Yow! HELLO KITTY gang
at terrorizes town, family
visi.com STICKERED to death!
PčéJäy
news:40591d98$0$41287$a186...@newsreader.visi.com...
> On 2004-03-18, PèéJäy <spam_m...@waterlogic.com.au> wrote:
>
> > Brilliant!!! Thanks.
>
> [100+ lines clipped]
>
> You had to quote all 100+ lines just to add that? I guess what
> they say about Perl is right...
Sorry, I didn't realise you were using a 1200 Baud modem...
Grant Edwards
> "Grant Edwards" <gra...@visi.com> wrote in message
> news:40591d98$0$41287$a186...@newsreader.visi.com...
>> On 2004-03-18, PèéJäy <spam_m...@waterlogic.com.au> wrote:
>>
>> > Brilliant!!! Thanks.
>>
>> [100+ lines clipped]
>>
>> You had to quote all 100+ lines just to add that? I guess what
>> they say about Perl is right...
>
> Sorry, I didn't realise you were using a 1200 Baud modem...
The rules of good etiquette and manners often outlive the
practical reasons for the original custom. I doubt you or
anybody you meet ever carries a dagger either, but refusing to
shake hands would still be rude.
--
Grant Edwards grante Yow! Please come home with
at me... I have Tylenol!!
visi.com