LP-EM-CC2340R53: scanInterval/scanWindow Impacts on Bluetooth Connection

Peisheng Yang

Part Number: LP-EM-CC2340R53

Tool/software:

HI TI,

I noticed there is a struct in the settings as shown below, and I would like to understand the functions of scanInterval and scanWindow within this struct. Furthermore, do these two parameters have any direct or indirect impacts after a Bluetooth connection is successfully established?

I’ve observed that modifying the scan interval seems to affect the stability of the Bluetooth connection, and I’m wondering if this is a normal phenomenon.

const BLEAppUtil_ConnParams_t centralConnInitParams =
{
/*! Opt INIT_PHY_ALL | INIT_PHY_1M | INIT_PHY_2M | INIT_PHY_CODED */
.initPhys = DEFAULT_INIT_PHY,

.scanInterval = INIT_PHYPARAM_SCAN_INT, /* Units of 0.625ms */
.scanWindow = INIT_PHYPARAM_SCAN_WIN, /* Units of 0.625ms */
.minConnInterval = INIT_PHYPARAM_MIN_CONN_INT, /* Units of 1.25ms */
.maxConnInterval = INIT_PHYPARAM_MAX_CONN_INT, /* Units of 1.25ms */
.connLatency = INIT_PHYPARAM_CONN_LAT,
.supTimeout = INIT_PHYPARAM_SUP_TO /* Units of 10ms */
};

2 days ago

0 David 2 days ago

TI__Genius 15535 points

Hello Peisheng,

Thanks for reaching out.

I would suggest to look at this training material: https://dev.ti.com/tirex/content/simplelink_academy_for_cc23xx_8_40_01_00/_build_simplelink_academy_for_cc23xx_8_40_01_00/source/ble/cc2340rx_02_ble_scan_adv_basic.html.

There you will find more information about the different scanning and advertisement parameters.

BR,

David.

0 Peisheng Yang 1 day ago in reply to David

Intellectual 660 points

Hello David,

Thank you for your reply.

In the document you shared - "Bluetooth® Low Energy Connections with basic_ble example" - I noticed that the connection parameters it describes do not include scan interval and scan window, even though these parameters exist in actual connection parameter settings.

I understand the role that scanning parameters play before a connection is established. My key focus is to understand, Do scanning parameters have any impact during and after the establishment of a connection?

Bluetooth®︎

Bluetooth forum

LP-EM-CC2340R53: scanInterval/scanWindow Impacts on Bluetooth Connection