kx3-read-swr.rb

#!ruby

require 'serialport'

@port = SerialPort.new(
	"/dev/tty.usbserial-A402PY11",
	38400,
	8,
	1,
	0
)
@port.set_encoding(Encoding::BINARY)

TEXT_MAP = {
	'<' => 'L',
	'>' => '-',
	'@' => ' ',
	'K' => 'H',
	'M' => 'N',
	'Q' => 'O',
	'V' => 'U',
	'W' => 'I',
	'X' => 'c-bar',
	'Z' => 'c',
	'[' => 'r-bar',
	'\\' => 'λ',
	']' => '',
	'^' => '',
}

def get_swr(step=3)
	ret = 0
	step.times do 
		@port << "DS;"
		data = @port.gets(";")
		t, a, f = *data.match(/DS(........)(.)(.)/).captures
		t = t.split(//).reduce("") {|r, i|
			chr = (i.ord & 0b01111111).chr
			r << ( ( (i.ord & 1<<7) != 0) ? ("." + chr) : (chr) )
		}.gsub(Regexp.new(TEXT_MAP.keys.map {|i| Regexp.escape(i) }.join("|")), TEXT_MAP)
		# KX3 displays SWR to main display as following : "1.2-1"
		if m = t.match(/([\d]+.[\d]+)-I/)
			swr = m[1]
		else
			return nil
		end
		ret += swr.to_f
		# p [t, a, f, swr]
	end
	ret / step
end

def get_freq
	@port << "FA;"
	res = @port.gets(";")
	freq = res.match(/FA(\d{11})/)[1].to_i
end

def set_freq(freq)
	@port << ("FA%011d;" % freq)
	get_freq == freq or raise "Failed to set freq"
end

def bypass_atu(&block)
	@port << "MN023;"
	@port << "MP;"
	current = @port.gets(";")
	current =~ /^MP\d{3}/ or raise "Unknown Responde #{current}"
	@port << "MP001;MP;"
	res = @port.gets(";")
	res == "MP001;" or raise "Failed to set KAT3 bypass: #{res}"
	@port << "MN255;"
	block.call
ensure
	@port << "MN023;"
	@port << current
	@port << "MN255;"
end

def tune(&block)
	# Switch Hold Emulation 16 = TUNE
	@port << 'SWH16;'
	sleep 0.5
	@port << 'TQ;'
	@port.gets(";") == 'TQ1;' or raise "Band END"
	sleep 0.3
	block.call
ensure
	@port << "RX;"
	sleep 0.5
	@port << "TQ;"
	@port.gets(";") == 'TQ0;' or raise "Failed to back to RX"
end

def scan_swr
	result = []
	@port << "PC;"
	current_power = @port.gets(";")
	@port << "PC001;PC;"
	@port.gets(";") == "PC001;" or raise "Failed to set power"
	bypass_atu do
		freq = get_freq
		step = 20e3
		range = Range.new(freq - 100e3, freq + 100e3)
		
		catch(:done) do
			begin
				set_freq(range.first)
				tune do
					range.step(step) {|n|
						set_freq(n)
						swr = get_swr(3)
						if swr.nil?
							throw :done
						end
						r = [n, swr]
						p r
						result << r
					}
				end
			rescue => e
				if e.message = "Band END"
					range = Range.new(range.first + step, range.last)
					retry
				end
			ensure
				set_freq(freq)
			end
		end
	end
	result
ensure
	@port << current_power
	@port << "PC;"
	@port.gets(";") == current_power or raise "Failed to back to power"
end

p scan_swr