CC1352P7: How can I decrease the timing on sub1GHz communication

Hamza Alpiyal

Part Number: CC1352P7

Hello,

I am using the launchpad kit to develop a system to transfer files on Sub1. I am using the collector and sensor examples to establish communication. I am getting everything running successfully but the problem is that it's slow.

The TI 15.4 stack parameters are:

RADIO:
Mode: Frequency Hopping
Sub-1 Frequency: 902-927MHz
Phy Type: 200kbps,2-GFSK
Rf Coexistence: Disabled

Power:
Transmit Power: 10

As it is 200Kbps it should take a second a transmit a 200Kb file right but in my case for a 4KB file it takes around 3 minutes. In my project currently, I have three tasks excluding idle. one console task priority 6, FTP task priority 2, and I didn't play with communication tasks priority.

Questions:
1. how can I make this faster?
2. any alternate ways to accomplish this?

over 2 years ago

0 Siri over 2 years ago

TI__Guru* 86731 points

You need to remember that you using our SW stack you are not able to to transmit all bytes as one long packet.

There is a max size to the payload, and in addition, every packet has overhead, like preamble, sync word, headers, crc bytes etc.

The radio will also not be able to transmit back to back, so there will typically be a delay between packets.

If you want to/need to use the TI15.4 stack, you will save some time by not using FH mode and also by using non-beacon mode.

It is fully possible to not use any stack and implement a point-to-point link yourself using the prop. RF API, and infinite packet length mode.

However, if you are transmitting 4KB as one long packet, the chance of getting bit errors in there corrupting the complete packet, is rather big, I would say.

Siri

0 Hamza Alpiyal over 2 years ago in reply to Siri

Prodigy 150 points

Hello Siri,
Thanks for the answer. Yeah, I am using a packet format sending 64 Bytes of data in each packet.
So with your response, I get that with delays it's normal to have delays like this right?

0 Siri over 2 years ago in reply to Hamza Alpiyal

TI__Guru* 86731 points

I do not have any exact numbers, but you will not get even close to 200 kbps throughput.

You can try without frequency hopping and also increase the packet size, to get some improvements.

SIri

0 Hamza Alpiyal over 2 years ago in reply to Siri

Prodigy 150 points

hi Siri,

Thanks for your response I will look into your suggestion.

I have an out-of-context question it would be great if you could guide me on that.
I have 6 tasks running in my project but the tasks take a lot of time to execute. Can you share some documentation or any forum thread that I can check out?

0 Siri over 2 years ago in reply to Hamza Alpiyal

TI__Guru* 86731 points

I recommend you to look at the following:

Real-Time OS (SLA's on RTOS)

Also, see the ROV section in the following, on how to use ROV for debugging:

Debugging — SimpleLink CC13XX/CC26XX SDK Proprietary RF User's Guide 6.10.01 documentation

Siri

0 Hamza Alpiyal over 2 years ago in reply to Siri

Prodigy 150 points

thanks

Sub-1 GHz

Sub-1 GHz forum

CC1352P7: How can I decrease the timing on sub1GHz communication