how to set the connection interval for nrf52832

[ps_anu]

Hi, 

I am working on the nRF52832 ,If i want my data to be transmit every 7.5ms then what should I set the  minimum connection interval and  maximum connection interval ? please suggest me

Thanks & Regards 

pspavi

[Simonr]

Hi

A low connection interval will enable your device to send packets more frequently. To modify the connection interval in any BLE example adjust the following constants that are located at the top of the project's main.c file (see snippet below). If you need the connection interval to be a specific value (7.5ms for instance) you can set both the minimum and maximum value to this.

#define MIN_CONN_INTERVAL               MSEC_TO_UNITS(100, UNIT_1_25_MS)        /**< Minimum acceptable connection interval (0.1 seconds). */
#define MAX_CONN_INTERVAL               MSEC_TO_UNITS(200, UNIT_1_25_MS)        /**< Maximum acceptable connection interval (0.2 second). */

Best regards,

Simon

[ps_anu]

Thank you simonr. 

The above snippet for 7.5ms Configuration right. How these are calculated? Can you explain , because I want to send the data on three different configuration 7.5ms , 10ms, 20ms 

Thanks &Regards

Pspavi

[ps_anu]

If i set above minimum and maximum connection interval i am getting fatal error . while debugging i am getting the ble_advertising_start function error 

[Simonr]

The snippet I provided does not set the connection interval to 7.5ms. In that specific snippet the connection interval it sets MIN_CONN_INTERVAL to 100ms, and MAX_CONN_INTERVAL to 200ms. You have to change the parameter in MSEC_TO_UNITS(100, UNIT_1_25_MS) to the amount of ms you would like to have in your application.

What kind of error code is returning from the ble_advertising_start() function?

Best regards,

Simon

[ps_anu]

Thanks alot simonr .It worked but i am not getting the same interval between the two events plus or minus 3 varying . 

even i have set min and max connection interval same .

MIN_CONN_INTERVAL to 9 ms, and MAX_CONN_INTERVAL to 9 ms.