I use the following piece of code to read the serial port until i get a terminating character. ''Read until you see a terminating character with a timeout'' response=[] byte_read=' break_yes=0 time_now = time.clock() while ((not (byte_read==' r') ) and (break_yes==0)): byte_read = self.ser.read(1) if (not(len(byte_read)== 0) and (not (byte_read ==' r'))): response.append(byte_read) if ( time.clock() - time_now >1 ): if self.DEBUG_FLAG: print '[animatics Motor class] time out occured. Check code' break_yes=1 if break_yes==0: return '.join(response) else: return 'FAIL' This works well but because of the while loop, the cpu resources are taken up. I think that having a blocking read(1) with a timeout will save some of the cpu. The flag i am looking for C is 'MIN == 0, TIME >0 (read with timeout)' in termios i am looking for a similar flag in Python. I could also use the io.readline to read till i get ' r', but i want to stick to pyserial as much as possible without any other dependency.

Would greatly appreciate advice. Do let me know if i should do it in a completely different way either too. According to the documentation, read() should be a blocking operation. You don't show how you open the serial port, please supply that part, too. Beyond that, your code is quite unpythonic. Python has bools, don't use integers as flags. It also has a!=-operator, no need to use a confusing 'not a == b'.

Python has a break-statement to leave loops, no need to emulate that with a flag. Using that would remove more or less 80% of your code, while keeping the same semantics. Returning strings with 'FAIL' as error-message when the expected result is also a string calls for trouble. – Jun 18 '15 at 22:47 •. Aight, so I found out a way.

Instead of polling with the no timeout, I use the select module in python, which is similar to the one in C. It returns if any data is available immediately, or waits for the timeout period and exits, which is precisely what i wanted. Free Download Subtitle Indonesia Hana Yori Dango Final Sub. I took deets comments for cleaning up the code and it looks like so now. Def readOnly(self): ''Read until you see a terminating character with a timeout'' response=[] byte_read=' while (not (byte_read==' r')): reading,_,_ = select. Shirdi Sai Baba Vratham In Telugu Pdf there. Mc Shan Down By Law Download. select([self.ser], [], [], 1) #returns immediately if there is data on serial port. Waits 1 second to timeout if not.

PySerial is a Python API module to access the serial port. Examples to Change serial. # It will return only the no of bytes read within the specified timeout. __init__ (port=None, baudrate=9600, bytesize=EIGHTBITS, parity=PARITY_NONE, stopbits=STOPBITS_ONE, timeout=None, xonxoff=False, rtscts=False. Example: >>>with serial.serial_for_url(port) as s. The port is opened automatically: >>>port = serial.Serial() >>>port.port = '.' >>>with port as s:.