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CC2650MODA: How connection interval interfere data length extension

user5100735
Intellectual 410 points
Part Number: CC2650MODA
Other Parts Discussed in Thread: CC2650

Hi all,

I have some problem with data length extension on cc2650 (both master and slave are cc2650).

 

I can only reach a 60 kbps data rate with max MTU size=247 (set by Btool), connection interval = 7.5ms.

And I have done all the procedure in data sheet "5.6 LE Data Length Extension"

(uncomment "-DBLE_V42_FEATURES=EXT_DATA_LEN_CFG"

and add the function HCI_LE_WriteSuggestedDefaultDataLenCmd in initial funciton)

 

I suppose the problem is connection interval.

Simple_link example docs(which is the screen shot below) show that data rate can achieve 200 kbps.

With connection interval increase, the data rate increase.

 

 

However, the data sheet has a opposite description about connection interval.

Is there any difference between these "connection interval"?

Thanks.

 


  • 0
    TI__Guru* 81751 points
    Hi,

    Did you successfully implement the "notification queueing" which is described in the example doc?

    Since you can send an unlimited number of packets per connection interval, a longer connection interval will give you a higher throughput (according to the graph in the example doc). Can you try using 100 or 200 ms as the connection interval?

    If you can only send a limited amount of packets per connection interval (e.g. some smartphones limit this to one packet per connection interval), a lower connection interval will give a higher thorughput.