CC2538: Transmit stops while send data

Ilya Sokolov1

Intellectual 840 points

Part Number: CC2538

Hello.

I have an application, which sends 72 bytes of data from endpoint to coordinator 11 times per second.

Sometimes there is strange stop in transmitting, it looks like one of the devices leaves network.

The log file is attached.

Stopping_example.psd

Can somebody tell me what is reason of such behaviour?

over 7 years ago

0 YiKai Chen over 7 years ago

Guru 735695 points

You send message too fast as I mentioned in your another similar post.

0 Ilya Sokolov1 over 7 years ago in reply to YiKai Chen

Intellectual 840 points

Even 11 times per secons is too fast? Last thread you said about 1 packet per 50 miliseconds: e2e.ti.com/.../2556008
Elleven times per second is about one packet per 90 miliseconds.

0 YiKai Chen over 7 years ago in reply to Ilya Sokolov1

Guru 735695 points

Do you disable APS ack?

0 Ilya Sokolov1 over 7 years ago in reply to YiKai Chen

Intellectual 840 points

No,I don't.
But 11 is two times less than 20, so I think this would be OK.
Also, maybe it will be better to discuss in the previous thread?
I wrote you some calculations: e2e.ti.com/.../2557069

0 YiKai Chen over 7 years ago in reply to Ilya Sokolov1

Guru 735695 points

Already replied you in your another post. I still suggest you to disable APS ack if you want to transmit fast.

0 Ilya Sokolov1 over 7 years ago in reply to YiKai Chen

Intellectual 840 points

Thank you very much.

Have you any experience with Bluetooth Low Energy? What is it's real data rate?

0 YiKai Chen over 7 years ago in reply to Ilya Sokolov1

Guru 735695 points

Yes, I have experience with BLE. I don't remember real data rate of BLE but I am pretty sure it is much faster than Zigbee.

0 Ilya Sokolov1 over 7 years ago in reply to YiKai Chen

Intellectual 840 points

Thank you. And that about BLE's reliability? I mean packet retranslission if it's lost etc.

0 YiKai Chen over 7 years ago in reply to Ilya Sokolov1

Guru 735695 points

I would say BLE is reliable but the range is not good. A normal BLE communication is usually for short distance like less than 10 meters line-of-sight.

0 Ilya Sokolov1 over 7 years ago in reply to YiKai Chen

Intellectual 840 points

So if I need transmit stream of data on the distance about 50-100 meters I have to use ULP WIFI?

0 YiKai Chen over 7 years ago in reply to Ilya Sokolov1

Guru 735695 points

I suspect ULP WiFi can have 50-100 meters if you don't add any PA/LNA. I would suggest you to try BLE 5.0 or add PA/LNA when using BLE 4.2.

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CC2538: Transmit stops while send data