added grbl version comparison and check to see if required version is detected.

If the right grbl version is not detected, the arduino is flashed with the right
hex file.

.gitignore

@@ -24,3 +24,4 @@ OctoPrint.egg-info
 *.codekit
 /nbproject/
 .directory
+.project

src/octoprint/util/comm_acc.py

@@ -820,6 +820,54 @@ class MachineCom(object):
 
 	##~~ Serial monitor processing received messages
 
+	@staticmethod
+	def _writeGrblVersionToFile(versionDict):
+		if versionDict['dirty'] == '-dirty':
+			versionDict['dirty'] = True
+		versionDict['lastConnect'] = time.time()
+		import yaml
+		versionFile = os.path.join(settings().getBaseFolder("logs"), 'grbl_Version.yml')
+		with open(versionFile, 'w') as outfile:
+			outfile.write(yaml.dump(versionDict, default_flow_style=True))
+
+	def _compareGrblVersion(self, versionDict):
+		with open("src/octoprint/util/grblVersionRequirement.yml", 'r') as infile:
+			import yaml
+			grblReqDict = yaml.load(infile)
+		requiredGrblVer = str(grblReqDict['grbl']) + '_' + str(grblReqDict['git'])
+		if grblReqDict['dirty'] is not(None):
+			requiredGrblVer += '-dirty'
+		if grblReqDict['minor'] != '':
+			requiredGrblVer += ':' + grblReqDict['minor']
+		actualGrblVer = str(versionDict['grbl']) + '_' + str(versionDict['git'])
+		if versionDict['dirty'] is not(None):
+			actualGrblVer += '-dirty'
+		if versionDict['minor'] != '':
+			actualGrblVer += ':' + versionDict['minor']
+		# compare actual and required grbl version
+		self._requiredGrblVer = requiredGrblVer
+		self._actualGrblVer = actualGrblVer
+		if requiredGrblVer != actualGrblVer:
+			self._log("unsupported grbl version detected...")
+			self._log("required: " + requiredGrblVer)
+			self._log("detected: " + actualGrblVer)
+			return False
+		else:
+			return True
+
+	def _flashGrbl(self):
+		self._log("flashing grbl version: " + self._requiredGrblVer)
+		self._serial.close()
+		self._changeState(self.STATE_CLOSED)
+		import subprocess
+		params = ["avrdude", "-patmega328p", "-carduino", "-b" + str(self._baudrate), "-P" + str(self._port), "-D", "-Uflash:w:grbl.junior.hex"]
+		#params = ['pwd']
+		if subprocess.call(params) is False:
+			self._log("successfully flashed new grbl version")
+		else:
+			self._log("error during flashing of new grbl version")
+		self._openSerial()
+
 	def _monitor(self):
 		feedback_controls, feedback_matcher = convert_feedback_controls(settings().get(["controls"]))
 		feedback_errors = []
@@ -951,6 +999,14 @@ class MachineCom(object):
 						self._changeState(self.STATE_LOCKED)
 						eventManager().fire(Events.ERROR, {"error": self.getErrorString()})
 
+					if("Grbl" in line):
+						versionMatch = re.search("Grbl (?P<grbl>.+)_(?P<git>[0-9a-f]{7})(?P<dirty>-dirty)?(?P<minor>.*) \[.+\]", line)
+						if(versionMatch):
+							versionDict = versionMatch.groupdict()
+							self._writeGrblVersionToFile(versionDict)
+							if self._compareGrblVersion(versionDict) is False:
+								self._flashGrbl()
+
 					if("error:" in line):
 						self.handle_grbl_error(line)
 

src/octoprint/util/grblVersionRequirement.yml

@@ -0,0 +1 @@
+{dirty: true, git: b35ae73, grbl: 0.9g, lastConnect: null, minor: ''}