RE: How about capobility of 52832 in rate,delay,distance,amount of slave in piconet ?

Susheel Nuguru — Thu, 26 Mar 2020 07:22:10 GMT

Like I said on my previous comment, If I were you, I will put some efforts to reduce the post processing software overhead for the data received from UART. I guess that is where we can do any optimizations if any. I am assuming that the BLE data is being transmitted using 2Mbps PHY and not a 1Mbps default PHY.

RE: How about capobility of 52832 in rate,delay,distance,amount of slave in piconet ?

Susheel Nuguru — Thu, 26 Mar 2020 07:15:49 GMT

[quote user=""]Each slave upload data 2KB/S,and the max distance support is 10 m[/quote]

This seems doable but could be challenging in a BLE noisy environment (many other 2.4GHz devices around)

[quote user=""]Can i make it work in Ble5.0?[/quote]

We have made some throughput test available in SDK16 examples that achieved around 1Mbps max though put for one connection. We used there BLE5.0 feature of 2Mbps PHY which transmits data faster from the radio. So yes, this is definitely doable but 4 connections at a max distance of 10 meters are something I have not tested.

[quote user=""] I found when distance increase,jitter of packege aslo increase,buffer is not large enough for cache.but increase buffer mean greater time delay.[/quote]

The time delay is not because of the increased buffer, but most likely due to the retransmission of the lost packets.

[quote user=""]SLAVE_LATENCY:0 [/quote]

Probably a good idea to increase this 1 or 2.

[quote user=""]I also trying SDK 16.0.0 using uarte in dma and baud up to 1Mbps to make master send data to mcu more quickly,is it help?[/quote]

The main challenge here is to have very less software overhead per transaction data received from UART to data sent over BLE. If the software overhead increases then the latencies of transmission of data from UART to BLE increases causing clogging. So this totally depends on how you are designing the application and also could have data transmission limitation if you want to receive data from uart to be transmitted over BLE due to uart driver software overhead. You need to do some benchmarks on this, since we have not done those benchmarks with uart data being transmitted over BLE with least software overhead.

RE: How about capobility of 52832 in rate,delay,distance,amount of slave in piconet ?

Taoo — Wed, 25 Mar 2020 01:49:23 GMT

Is there any help?

I already made it (1 mater - 4 slave,distance less than 2m) work in SDK16.0.0 using uarte 1Mbps .Sometime it work well,but sometime appear packet lost unexplainably.it still can not work well in distance 10m.

I really hope for help, please give me some guide to try.

Thank you so much!!!