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# nmea.tcl --
#
# NMEA protocol implementation
#
# Copyright (c) 2006-2009 Aaron Faupell
#
# RCS: @(#) $Id: nmea.tcl,v 1.5 2009/01/09 06:49:25 afaupell Exp $
package require Tcl 8.4
package provide nmea 1.0.0
namespace eval ::nmea {
array set ::nmea::nmea [list checksum 1 log {} rate 0]
array set ::nmea::dispatch ""
}
proc ::nmea::open_port {port {speed 4800}} {
variable nmea
if {[info exists nmea(fh)]} { ::nmea::close }
set nmea(fh) [open $port]
fconfigure $nmea(fh) -mode $speed,n,8,1 -handshake xonxoff -buffering line -translation crlf
fileevent $nmea(fh) readable [list ::nmea::read_port $nmea(fh)]
return $port
}
proc ::nmea::open_file {file {rate {}}} {
variable nmea
if {[info exists nmea(fh)]} { ::nmea::close }
set nmea(fh) [open $file]
if {[string is integer -strict $rate]} {
if {$rate < 0} { set rate 0 }
set nmea(rate) $rate
}
fconfigure $nmea(fh) -buffering line -blocking 0 -translation auto
if {$nmea(rate) > 0} {
after $nmea(rate) [list ::nmea::read_file $nmea(fh)]
}
return $file
}
proc ::nmea::configure_port {settings} {
variable nmea
fconfigure $nmea(fh) -mode $settings
}
proc ::nmea::close {} {
variable nmea
catch {::close $nmea(fh)}
unset -nocomplain nmea(fh)
foreach x [after info] {
if {[lindex [after info $x] 0 0] == "::nmea::read_file"} {
after cancel $x
}
}
}
proc ::nmea::read_port {f} {
if {[catch {gets $f} line] || [eof $f]} {
if {[info exists ::nmea::dispatch(EOF)]} {
$::nmea::dispatch(EOF)
}
nmea::close
}
if {$::nmea::nmea(log) != ""} {
puts $::nmea::nmea(log) $line
}
::nmea::parse_nmea $line
}
proc ::nmea::read_file {f {auto 1}} {
variable nmea
set line [gets $f]
if {[eof $f]} {
if {[info exists ::nmea::dispatch(EOF)]} {
$::nmea::dispatch(EOF)
}
nmea::close
return 0
}
if {[string match {$*} $line]} {
::nmea::parse_nmea $line
} else {
::nmea::parse_nmea \$$line
}
if {$auto} {
after $nmea(rate) [list ::nmea::read_file $f]
}
return 1
}
proc ::nmea::do_line {} {
variable nmea
if {![info exists nmea(fh)]} { return -code error "there is no currently open file" }
return [::nmea::read_file $nmea(fh) 0]
}
proc ::nmea::configure {opt {val {}}} {
variable nmea
switch -exact -- $opt {
rate {
if {$val == ""} { return $nmea(rate) }
if {![string is integer $val]} { return -code error "rate must be an integer value" }
if {$val <= 0} {
foreach x [after info] {
if {[lindex [after info $x] 0 0] == "::nmea::read_file"} {
after cancel $x
}
}
set val 0
}
if {$nmea(rate) == 0 && $val > 0} {
after $val [list ::nmea::read_file $nmea(fh)]
}
set nmea(rate) $val
return $val
}
checksum {
if {$val == ""} { return $nmea(checksum) }
if {![string is bool $val]} { return -code error "checksum must be a boolean value" }
set nmea(checksum) $val
return $val
}
default {
return -code error "unknown option $opt"
}
}
}
proc ::nmea::input {sentence} {
if {![string match "*,*" $sentence]} { set sentence [join $sentence ,] }
if {[string match {$*} $sentence]} {
::nmea::parse_nmea $sentence
} else {
::nmea::parse_nmea \$$sentence
}
}
proc ::nmea::log {{file _X}} {
variable nmea
if {$file == "_X"} { return [expr {$nmea(log) != ""}] }
if {$file != ""} {
if {$nmea(log) != ""} { ::nmea::log {} }
set nmea(log) [open $file a]
} else {
catch {::close $nmea(log)}
set nmea(log) ""
}
return $file
}
proc ::nmea::parse_nmea {line} {
set line [split $line \$*]
set cksum [lindex $line 2]
set line [lindex $line 1]
if {$cksum == "" || !$::nmea::nmea(checksum) || [checksum $line] == $cksum} {
set line [split $line ,]
set sentence [lindex $line 0]
set line [lrange $line 1 end]
if {[info exists ::nmea::dispatch($sentence)]} {
$::nmea::dispatch($sentence) $line
} elseif {[info exists ::nmea::dispatch(DEFAULT)]} {
$::nmea::dispatch(DEFAULT) $sentence $line
}
}
}
proc ::nmea::checksum {line} {
set sum 0
binary scan $line c* line
foreach char $line {
set sum [expr {$sum ^ ($char % 128)}]
}
return [format %02X [expr {$sum % 256}]]
}
proc ::nmea::write {type args} {
variable nmea
set data $type,[join $args ,]
puts $nmea(fh) \$$data*[checksum $data]
}
proc ::nmea::event {sentence {command _X}} {
variable dispatch
set sentence [string toupper $sentence]
if {$command == "_X"} {
if {[info exists dispatch($sentence)]} {
return $dispatch($sentence)
}
return {}
}
if {$command == ""} {
unset -nocomplain dispatch($sentence)
return {}
}
set dispatch($sentence) $command
return $command
}
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