From 4cdf144c41c7b2d3100251e5a47e35f98cb09c30 Mon Sep 17 00:00:00 2001
From: Kevin Chabowski <kevin@kch42.de>
Date: Tue, 22 Mar 2011 22:15:22 +0100
Subject: Added synchronisation with Arduino.

---
 .gitignore                    |  1 +
 Arduino sketch/serial_rgb.pde |  1 +
 Python code/rgbled.py         | 17 +++++++++++++----
 Python code/serialrgb.py      | 18 +++++++++++++++++-
 4 files changed, 32 insertions(+), 5 deletions(-)
 create mode 100644 .gitignore

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..0d20b64
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+*.pyc
diff --git a/Arduino sketch/serial_rgb.pde b/Arduino sketch/serial_rgb.pde
index 84d331b..f6121a2 100644
--- a/Arduino sketch/serial_rgb.pde	
+++ b/Arduino sketch/serial_rgb.pde	
@@ -21,6 +21,7 @@ void loop()
     r = Serial.read();
     g = Serial.read();
     b = Serial.read();
+    Serial.write('1'); // Sync
   }
   analogWrite(LEDR, r);
   analogWrite(LEDG, g);
diff --git a/Python code/rgbled.py b/Python code/rgbled.py
index 8d699b4..8378577 100755
--- a/Python code/rgbled.py	
+++ b/Python code/rgbled.py	
@@ -4,7 +4,7 @@
 from __future__ import division
 import wx, math
 from wx.lib.colourchooser.pycolourchooser import PyColourChooser
-from serialrgb import SerialRGB
+from serialrgb import SerialRGB, SyncError
 
 def hsv2rgb(h, s, v):
 	h *= 360.0
@@ -63,14 +63,23 @@ class rgbled_frame(wx.Frame):
 		g = colour.Green()
 		b = colour.Blue()
 		if isinstance(self.rgbled, SerialRGB):
-			self.rgbled.change_color((r, g, b))
+			try:
+				self.rgbled.change_color((r, g, b))
+			except SyncError:
+				wx.MessageDialog(None, "Could not synchronize with Arduino!", "Sync Error", wx.ICON_ERROR | wx.OK).ShowModal()
+				self.Close()
 
 class rgbled_app(wx.App):
 	def OnInit(self):
 		self.rgbled = None
 		portdlg = wx.TextEntryDialog(None, "Serial port:")
 		if portdlg.ShowModal() == wx.ID_OK:
-			self.rgbled = SerialRGB(portdlg.GetValue())
+			try:
+				self.rgbled = SerialRGB(portdlg.GetValue())
+			except SyncError:
+				pass
+			#	wx.MessageDialog(None, "Could not synchronize with Arduino!", "Sync Error", wx.ICON_ERROR | wx.OK).ShowModal()
+			#	return False
 			frame = rgbled_frame(self.rgbled)
 			portdlg.Destroy()
 			frame.Show()
@@ -78,7 +87,7 @@ class rgbled_app(wx.App):
 		return True
 	def OnExit(self):
 		if isinstance(self.rgbled,SerialRGB):
-			self.rgb2hsv.close_connection()
+			self.rgbled.close_connection()
 
 if __name__ == '__main__':
 	myapp = rgbled_app()
diff --git a/Python code/serialrgb.py b/Python code/serialrgb.py
index 7296e22..8d7c6d8 100644
--- a/Python code/serialrgb.py	
+++ b/Python code/serialrgb.py	
@@ -1,7 +1,15 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 
-import serial
+import serial, time
+
+class SyncError(Exception):
+	"""Synchronisation error"""
+	def __init__(self, msg=""):
+		self._msg = str(msg)
+	
+	def __str__(self):
+		return msg
 
 class SerialRGB(object):
 	"""Easy controlling of the RGB-LED / Arduino"""
@@ -16,6 +24,12 @@ class SerialRGB(object):
 			self.ser = serial.Serial(addr, baud)
 		except:
 			raise IOError("Could not connect to Arduino via serial port.")
+		# Sync...
+		while self.ser.inWaiting() < 1:
+			self.ser.write("\x00")
+			time.sleep(.01)
+		if self.ser.read(1) != "1":
+			raise SyncError
 	
 	def __del__(self):
 		self.close_connection()
@@ -28,6 +42,8 @@ class SerialRGB(object):
 		"""
 		r, g, b = color
 		self.ser.write(chr(r) + chr(g) + chr(b))
+		if self.ser.read(1) != "1":
+			raise SyncError
 	
 	def close_connection(self):
 		"""Closes the connection to the Arduino."""
-- 
cgit v1.2.3-54-g00ecf