#!/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