From 91b317ca798f7b625f0133659b2116c452401027 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?King=20K=C3=A9vin?= <kingkevin@cuvoodoo.info>
Date: Sat, 1 Aug 2015 12:41:41 +0200
Subject: [PATCH] add autoswitching baudrate (used by EasyPS2000)

---
 ps_simulator.rb | 43 +++++++++++++++++++++----------------------
 1 file changed, 21 insertions(+), 22 deletions(-)

diff --git a/ps_simulator.rb b/ps_simulator.rb
index a2cc4d8..c30d89f 100755
--- a/ps_simulator.rb
+++ b/ps_simulator.rb
@@ -9,10 +9,6 @@ DEBUG = true
 # connect to PC
 pc_serial = SerialPort.open("/dev/ttyUSB0",{ baud: 57600, databits: 8, parity: SerialPort::ODD, stop_bit: 1, flow_control: SerialPort::NONE})
 
-# ensure serial settings (weird bug)
-pc_serial.baud = 57600
-pc_serial.parity = SerialPort::ODD
-
 while true
   activities = IO.select([pc_serial])
   activities[0].each do |activity|
@@ -24,26 +20,29 @@ while true
         telegram_in = Telegram.parse(data)
         if telegram_in then
           puts "> "+telegram_in.to_s[2..-1]
+          telegram_out = case telegram_in.object
+            when 0 # device type
+              Telegram.new(telegram_in.object,"simulator".bytes.to_a+[0x00],false)
+            when 8 # manufacturer
+              Telegram.new(telegram_in.object,"EA".bytes.to_a+[0x00],false)
+            when 1, 6, 9 # article no., serial no., software version
+              Telegram.new(telegram_in.object,"42".bytes.to_a+[0x00],false)
+            when 2,3,4 # nominal voltage, current, power
+              Telegram.new(telegram_in.object,[42.0].pack("g").bytes.to_a,false)
+            when 19 # device class
+              Telegram.new(telegram_in.object,[0x00,0x10],false)
+            else # error: object not defined
+              Telegram.new(0xff,[0x07],false)
+          end
+          if telegram_out then
+            puts "< "+telegram_out.to_s[2..-1] # display message
+            pc_serial.write(telegram_out.pack) # send message
+          end
         else
-		  raise "could not parse message"
+          pc_serial.baud = (pc_serial.baud==57600 ? 115200 : 57600)
+          pc_serial.parity = SerialPort::ODD
+          puts "could not parse message: switching baudrate to #{pc_serial.baud} bps"
 		end
-        telegram_out = case telegram_in.object
-          when 0 # device type
-			# Telegram.new(telegram_in.object,[0x50,0x53,0x20,0x32,0x30,0x38,0x34,0x2D,0x30,0x33,0x42,0x00])
-            Telegram.new(telegram_in.object,"simulator".bytes.to_a+[0x00],false)
-          when 1, 6, 9 # article no., serial no., software version
-            Telegram.new(telegram_in.object,"42".bytes.to_a+[0x00],false)
-          when 2,3,4 # nominal voltage, current, power
-            Telegram.new(telegram_in.object,[42.0].pack("g").bytes.to_a,false)
-          when 19 # device class
-            Telegram.new(telegram_in.object,[0x00,0x10],false)
-          else # error: object not defined
-            Telegram.new(0xff,[0x07],false)
-        end
-        if telegram_out then
-          puts "< "+telegram_out.to_s[2..-1] # display message
-          pc_serial.write(telegram_out.pack) # send message
-        end
       rescue Exception => e
         puts e.to_s
       end