python - blocking read(1) with timeout in pyserial -

-

i use following piece of code read serial port until terminating character.

"""read until see terminating character timeout"""     response=[]     byte_read=''     break_yes=0     time_now = time.clock()     while ((not (byte_read=='\r') ) , (break_yes==0)):         byte_read = self.ser.read(1)         if (not(len(byte_read)== 0) , (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 because of while loop, cpu resources taken up.

i think having blocking read(1) timeout save of cpu. flag looking c "min == 0, time > 0 (read timeout)" in termios

i looking similar flag in python.

i use io.readline read till '\r', want stick pyserial as possible without other dependency.

would appreciate advice. let me know if should in different way either too.

thanks,

you should read documentation of pyserial: states timeout of 0 pass constructor turn on non-blocking behaviour:

http://pyserial.sourceforge.net/pyserial_api.html#classes

just rid of timeout parameter, , should set.


Comments

Post a Comment

Popular posts from this blog

PHP DOM loadHTML() method unusual warning -

-
i had following code works fine on localhost: $document = new domdocument(); $document->loadhtml($p_result); $form = $document->getelementsbytagname('form')->item(0); // code continues using $form variable after same code updated on outside server, loadhtml() failed , issued warning. warning: domdocument::loadhtml() expects parameter 1 valid path, string given in path/name/to/script.php returned null instead of object code pretty gets fatal error. note contents of $p_result absolutely same on outside server , on localhost. but why displays kind of warning , why not work? doesn't loadhtml() expects argument 1 string in first place? why method expects parameter 1 valid path ? just make clear i'm not calling loadhtmlfile() , i'm calling loadhtml() . thanks. you're affected one of php bugs . issue present in php 5.6.8 , 5.6.9. have affected php version on server, , bug-free version on localhost. the bug forbids null
Read more

python - How to create jsonb index using GIN on SQLAlchemy? -

-
here's current code creating index jsonb. index("mytable_data_idx_id_key", mytable.data['id'].astext, postgresql_using='gin') but got error. sqlalchemy.exc.programmingerror: (psycopg2.programmingerror) data type text has no default operator class access method "gin" hint: must specify operator class index or define default operator class data type. [sql: "create index event_data_idx_id_key on event using gin ((data ->> 'id'))"] is there way create index on sqlalchemy? the postgresql specific sqlalchemy docs @ http://docs.sqlalchemy.org/en/latest/dialects/postgresql.html#operator-classes mention postgresql_ops dictionary provide "operator class" used postgresql, , provide example illustrating use: index('my_index', my_table.c.id, my_table.c.data, postgresql_ops={ 'data': 'text_pattern_ops',
Read more

c# - TransactionScope not rolling back although no complete() is called -

-
i'm using transactionscope rollback transaction fail bool errorreported = false; action<importerrorlog> newerrorcallback = e => { errorreported = true; errorcallback(e); }; using (var transaction = new transactionscope()) { foreach (importtaskdefinition task in taskdefinition) { loader.load(streamfile, newerrorcallback, task.destinationtable, processingtaskid); } if (!errorreported) transaction.complete(); } i'm sure there no transactionscope started ahead or after code. i'm using entity framework insert in db. regardless state of errorreported transaction never rolled in case of error. what missing ? transactionscope sets transaction.current . that's does. wants transacted must @ property. i believe ef each time connection opened reason. probably, connection open when scope installed. open connection inside of scope or enlist manually. ef has nasty "design decision": default opens
Read more