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use Device::SerialPort;
my $port = Device::SerialPort->new( "/dev/ttyS0" );
$port->baudrate(9600);
$port->databits(8);
$port->stopbits(1);
$port->parity("none");
my $string = '';
my $more = 1;
while($more) {
my $pass = $port->write('S$');
my $end_seen = 0;
while ( not $end_seen ) {
local $_ = $port->input;
if ( $_ ne '' ) {
if ( m/S:/ ) { # string start
$string = $_;
}
elsif ( m/:$/ ) { # string end
$string .= $_;
print $string; # deal with the final string
$end_seen=1;
$more=0;
}
else {
$string .= $_;
}
}
}
}
Be warned - If you are trying to get something out cleanly in one try, it will probably not work.
I found that I have to interrogate the PIC over and over to keep the UART alive and talking to me.
| [reply] [Watch: Dir/Any] [d/l] |
There is Win32API::CommPort.
Once upon a time I used to write testbed code for hardware I designed.
Generally the system control and monitoring was all done on RS-232 ports.
We were using Windows, and for at least the last 5 or 6 years that I can
recall we always did our testing in the lab with Perl.
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Hi, I don't remember where I got this, I think it was off of freshmeat. It is a guy who used the serial port to capture a geiger counter output.
#!/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 fil
+e
$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 e
+ach
#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
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