what is the Controller in BT?

[bernerd]

HI,ALL,

i find such sentence in core (BLUETOOTH SPECIFICATION Version 4.2 [Vol 1, Part A] page 13)

'A Controller is a logical entity defined as all of the layers below HCI'.

So i wanna know that what the controller is.

and which layer contains the BT chip such as NRF51822 ? ( HCI?? )

Thank you very much!!!!

[Susheel Nuguru]

The controller is the actual hardware on which bluetooth stack (software) is implemented. In this is nRF51 chip (hardware) is the controller.