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CCS / CC2640R2F：How to decrease the discovery time of slave characteristic value

Kevin Qiu
Intellectual 1530 points
Part Number: CC2640R2F


Tool/software: Code Composer Studio

Hi,

I use the multi_role project and  find five characteristic values.

I see that each characteristic value takes about 1 second.

How to speed up the discovery of slave  characteristic value time?

Regards,

Kevin

  • 0
    TI__Mastermind 43240 points

    Hello Kevin,

    I have a few questions. What version of the SDK are you using? How are you attempting to read the characteristics? Are you using BTool or some other software to interact with the characteristics? The time it takes for a read to occur depends on the current connection interval. You can try changing this parameter to try to speed up the characteristic read times. You may find the following E2E post useful (https://e2e.ti.com/support/wireless-connectivity/bluetooth/f/538/t/445452)

    Regards,

    Jan

  • 0 in reply to Jan
    TI__Intellectual 1530 points

    Hi Jan,

    SDK:simplelink_cc2640r2_sdk_4_10_00_10

    example: multi_role project

    I do not use the Btool  to interact with the characteristics,I use UART to Print the information as each feature value was found.

    [[2020-07-21 15:47:09.634]# RECV ASCII>
Start Char Finding
[2020-07-21 15:47:10.137]# RECV ASCII>
connIndex:00
discState:03
Simple Char Found
[2020-07-21 15:47:11.121]# RECV ASCII>
connIndex:00
discState:04
Simple Char Found
[2020-07-21 15:47:12.371]# RECV ASCII>
connIndex:00
discState:05
Simple Char Found
[2020-07-21 15:47:13.386]# RECV ASCII>
connIndex:00
discState:06
Simple Char Found
[2020-07-21 15:47:14.386]# RECV ASCII>
connIndex:00
discState:07
Simple Char Found

    I attempt to decrese connection interval,but the discovery time is still 1 second. Would you help to check it?

    Regards,

    Kevin

  • 0 in reply to Kevin Qiu
    TI__Mastermind 43240 points

    Hi Kevin,

    I have a few follow up questions. Can you describe what your test setup is? Are you using two boards each with multi_role to connect to each other? What modifications were made to multi_role? Can you verify if this delay is present using BTool? I used BTool + multi_role to verify and I am not seeing a 1 second delay per characteristic discovery. I would like to narrow down what the issue might be.

    Regards,

    Jan