#!/usr/bin/wish
##############################################################
# Global flags and variables
##############################################################
# Flags
set waiting_for_key 0
set question_asked 0
set timer_started 0
# Channel to talk to the MRC device
set MRC 0
# Mapping of MCR codes to keys: button(code)
set buttoncode 256
for {set i 1} {$i <=8} {incr i} {
set button($buttoncode) $i
set buttoncode [expr $buttoncode*2]
}
##############################################################
# Procedures for talking with MRC
##############################################################
# Open the given device for MRC. Return 0 if successful, 1 otherwise
proc open_mrc {device} {
global MRC
set result [catch {set MRC [open $device r+]}]
if {$result !=0} {
return $result
}
fconfigure $MRC -blocking 0 -translation binary \
-encoding binary -buffering none -mode 57600,n,8,1
puts $MRC s
after 200
read $MRC
puts $MRC r
after 200
read $MRC
return 0
}
# Return the key pressed or 0
proc readbuffer {} {
global MRC button
set key 0
set message [read $MRC]
binary scan $message s key
set key [expr $key & 0xFFFF]
if {[catch {set key $button($key)}] == 0} {
return $key
}
return 0
}
##############################################################
# Setup
##############################################################
button .start -text "Start" -command start
pack .start
label .pressed
pack .pressed
proc start {} {
global SRLFILE state idle waiting
readbuffer
.start configure -state disabled -command {}
set state $waiting
}
proc body {} {
global state idle waiting
update idletasks
if { $state == $waiting } {
set pressed [readbuffer]
if { $pressed != 0 } {
# set state $idle
# .start configure -state active -command start
.pressed configure -text "Pressed $pressed"
puts $pressed
readbuffer }
} else {
readbuffer
}
after 10 body
}
body
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