BLE data transmission interval is strange

[Kaito]

Hi!!

I am sending data by BLE data received by SPI.

The interval for sending data at BLE is 64 ms.

I have written and run NRF_SPI 1 -> ENABLE = 0; and NRF_SPI 1 -> ENABLE = 1;

However, when commenting out afterwards and letting run again with the same program, data transmission is initially performed in 64 ms, but after several seconds the data transmission interval will be 1 second.

What can cause this cause?

best regards!!

[Edvin]

Hello,

I feel that there is some information missing here. How do you maintain the 64ms interval? Do you use a timer? What is your connection interval? I guess the source code would explain a lot.

Best regards,

Edvin

[Kaito]

thank you for your reply!

I understood the cause!

The cause was in the connection interval.

Based on Apple documentation set the minimum connection interval to 800 ms and the maximum connection interval to 1 second.

When it changed the minimum connection interval to 40 ms and the maximum connection interval to 80 ms, it was able to transmit data without breakin the connection of BT!!