Changing Central Role Connection Interval

Eng351

I have both a central and peripheral device using the C2540. I am trying to improve the data throughput for GATT_WriteCharValue for sending data to the peripheral.

I have not been able to work out how to change the connect interval and it is at the 100ms default - as such I am only getting 90B/s

As far as I can see the peripheral advertises its max and min connection interval in the Scan Response and the Central device picks a suitable connection interval based on this.

How can I set the lowest possible connection interval?

over 13 years ago

0 GregS over 13 years ago

TI__Expert 6840 points

Hello,

Look at simpleBlePeripheral example. and set the automatic update negotiation.

// Whether to enable automatic parameter update request when a connection is formed
#define DEFAULT_ENABLE_UPDATE_REQUEST         FALSE


 GAPRole_SetParameter( GAPROLE_PARAM_UPDATE_ENABLE, sizeof( uint8 ), &enable_update_request );

Note - that either side should have a range of these values, and the negotiation should find a value both side agree on.

Set the peripheral range min & max  to your desired interval, and set the central to cover this range.

  #define DEFAULT_DESIRED_MAX_CONN_INTERVAL     80

 uint16 desired_max_interval = DEFAULT_DESIRED_MAX_CONN_INTERVAL;

 GAPRole_SetParameter( GAPROLE_MAX_CONN_INTERVAL, sizeof( uint16 ), &desired_max_interval );

BR,

-Greg

0 Eng351 over 13 years ago in reply to GregS

Genius 4125 points

Thanks Greg,

Ill try that. I managed to get the required result using GAPCentralRole_UpdateLink() as well.

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Changing Central Role Connection Interval