#!/usr/bin/perl
#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/drake/SerialPort_files";             # path to data file
$LOGFILE   = "geiger.log";              # file name to output to
$PORT      = "/dev/ttyS0";              # 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