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1. Arduino Print Time
2. Arduino Serial Print
3. Arduino Uno Software

I am using an Arduino Uno rev2 device as a permanently connected device that sometimes sends signals to a PC (Windows 7 x64). Code compiled with Arduino 1.0 software from arduino.cc

Topic on arduino.cc, Arduino stops sending data to Serial after a long time period

It works perfectly but sometimes, after a long period of time, the PC stops receiving data from the Arduino device. It is not a PC software issue, as all software(putty, telnet, etc.) acts the same - I can send data TO the Arduino (the device responds to commands); I just can't receive it back.

A similar problem was described here in Serial communication stops after long periods., but no solution was suggested.

Disconnecting/connecting the device solved the issue temporarily, but this can't be a solution, as the device is supposed to be used permanently and fully automatically.

Using board reset button that resets program & all values to it's start wont help. Data does not start to be being received by PC.

Notes:

1. millis() rollover bug is not reproducable on Arduino Uno board with Arduino 1.0 software - I guess this was fixed and millis() now do really rollover only in 50 days, like it is said in documentation. Besides code has millis() independent code that is not responding too.

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2. LED that is blinking during sending data to PC still blinks.

3. Strings usage could increase memory usage, but this program is way too small for that to be a problem. No additional memory was used after 10+ hours of program running, so I'm not really going to bother with replacing Strings with something else, as Serial port problem is far more major.

If you think that the problem is in arduino program bug, please think of how to explain TX blinking & reset not helping.

MPelletierMax The CatMax The Cat

4 Answers

Perhaps making a software reset your problem would be solved.I ran the following code to find out if a software reset would reset the clock and therefore the millis() function:

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As explained in the code, to make a software reboot simply create a function pointer to address 0 and call it.I, indeed, had satisfactory results:

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I hope this solves your problem :)

If you constantly poll Arduino, then as a workaround you can implement a watchdog in Arduino which will reset Arduino if it hasn't output data to PC for a long time. You can monitor Arduino TX pin, bring it to another input pin, use interrupt.. The point is to reset watchdog after each TX activity.

It is possible that the clock folds around.

previousclock = millis() might get stuck at a high value, just before folding around. You could extend the test to include the case that (currentmilis < previousmillis) plus/minus some fudge factor.

BTW It used ignas's source code (the OP sourcecode was not readble without registration, and I don't want to registrate)

EDIT: I copied the fragment below from wakkerbot, and edited it a bit. It is just todemonstrate how wraparound can get your last_action timestamps stuck at the top of an int interval (if the bump value is not a divisor for int_max)You could probably simplify the above/below logic a bit, since you are only interested in inside/outside interval tests. The typedef for Stamp should of course be adapted to the type of millis() (unsigned long ?) and fakemillis() removed and references to it replaced by millis().

If you compile and run the above program on a 'normal' computer, you can see the badlast and badtest getting stuck. That is what happens on your arduino, too, IMHO.

Update: definitely overflow/rollover. (GIYF)http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1200662708

Update2: unrelated, but bad coding practice:

You are comparing two strings here. (this might be handled as intended by c++, but in C it is just plain wrong. I'd also suggest replacing the repeating if(..) {..} by a giant switch statement, that would at least avoid calling the substr() function repeatedly. (or is it inlined?)

UPDATE 20111211: here is a wrap-oblivious compare&set function it needs a pointer to the value to compare and set, and the width of the intended interval:

This function is used in the loop() section as follows:

Finally: IMHO the reason why RESET does not work, is that not all global variables are initialised in the setup() function. Also: I think you should get rid of the String thingies (is there GC in the runtime ?) and use ordinary character buffers instead.

Arduino Print Time

wildplasserwildplasser

Arduino Serial Print

Arduino after a few hours is not able to execute commands from Arayks and TX 900 with wire, but after the restart the Arduino is enabled.

Arduino Uno Software

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