Search found 22 matches

by Miq1
Sun Apr 23, 2017 6:15 am
Forum: CELLv1.0
Topic: UART stutters on startup
Replies: 47
Views: 13965

Re: UART stutters on startup

One more observation... The Cell does work at lower baud rates, but not correctly. If I switch the baud rate to 19200, the output for "AT+COPN" is much shorter (177 lines) and several entries are missing that can be found when using 115200 (250 lines). I would have expected to get all data...
by Miq1
Sun Apr 23, 2017 4:12 am
Forum: CELLv1.0
Topic: UART stutters on startup
Replies: 47
Views: 13965

Re: UART stutters on startup

Another idea: the Cell provides RFR and CTS pins, although at different voltages (1.65-1.95V). May I use these to implement a kind of flow control?
by Miq1
Sun Apr 23, 2017 3:25 am
Forum: CELLv1.0
Topic: UART stutters on startup
Replies: 47
Views: 13965

Re: UART stutters on startup

Thanks again for your thoughts. I did some more experiments in the meantime and am afraid it may be out of my capabilities to compensate for the issues. I modified my code to put an additional '|' into the buffer whenever I will enter the read loop upon "CellOne.available()" being true. Th...
by Miq1
Sat Apr 22, 2017 9:32 am
Forum: CELLv1.0
Topic: UART stutters on startup
Replies: 47
Views: 13965

Re: UART stutters on startup

Looks like there may be another issue - based on the things you said, I wrote a simple copy sketch that takes everything coming from the Cell into a 8KB buffer. For test reasons I used the "AT+COPN" command that generates quite some data. But I noticed data gaps in the output, that cannot ...
by Miq1
Sat Apr 22, 2017 8:11 am
Forum: CELLv1.0
Topic: UART stutters on startup
Replies: 47
Views: 13965

Re: UART stutters on startup

You should really check out the code on the Arduino page: http://www.sparqee.com/portfolio/sparqee-shielda/ Here's the talk to the Arduino code... there are a lot of reasons it's structured the way it is... hardware clock, ISR routines, minimizing time spent in each process, etc. #include <Software...
by Miq1
Sat Apr 22, 2017 8:01 am
Forum: CELLv1.0
Topic: UART stutters on startup
Replies: 47
Views: 13965

Re: UART stutters on startup

A quick result ahead: 115200 baud works indeed. Default baud is 115200, that's faster than your 38400 and is default for the module Yes, of course. The reason I tried using lower baud rates is the number of things the Arduino will have to do while receiving data. If I got a couple of milliseconds be...
by Miq1
Sat Apr 22, 2017 7:46 am
Forum: CELLv1.0
Topic: UART stutters on startup
Replies: 47
Views: 13965

Re: UART stutters on startup

I'm not sure this one is a big deal. That particular status light could potentially just not work... I recall sending a bug report to ZTE about it one of the status lights. The other post is much more relevant to your situation. Thanks for looking after it. You were right, changing the wiring did n...
by Miq1
Thu Apr 20, 2017 11:00 pm
Forum: CELLv1.0
Topic: UART stutters on startup
Replies: 47
Views: 13965

Re: UART stutters on startup

5 Status lines: AR ( input ) - Module (CELLv1.0) checks if AP is asleep MR (output) - Module sleep status... If it's asleep, this will be lit AWM ( input ) - MWA (output)- Module (CELLv1.0) wakes up AP (Client) MP (output) - Module Poweron indication Now we seem to be getting further: all three MWA...
by Miq1
Thu Apr 20, 2017 2:36 am
Forum: CELLv1.0
Topic: UART stutters on startup
Replies: 47
Views: 13965

Re: UART stutters on startup

Great debug steps... so it's not sleeping. It's getting caught somewhere in the switchover. Have you setup a simple echo device - write from the Arduino IDE through Serial0, print to CELLv1.0, echo results to Serial1? I'm not sure about your code, but getting consistency on an earlier, simple codeb...
by Miq1
Wed Apr 19, 2017 11:34 pm
Forum: CELLv1.0
Topic: UART stutters on startup
Replies: 47
Views: 13965

Re: UART stutters on startup

Thanks for the advice. I already tested with AR and/or AWM set to GND unfortunately with no different results. Remains the check of the info lines; I will need a multimeter or osc to check tomorrow, as the Cell is on a PCB already and not easily rewired. I can confirm the odd "send ATE1 9-12 ti...

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