Bluetooth HCI Transport Layer
The HCI Transport is designed to abstract and simplify physical communication between the Bluetooth stack and the controller. Windows Embedded CE supports transport drivers for several interfaces including, UART, USB, SDIO, and BCSP.
A transport only implements a few functions; schematically, Open, Read, Write, Close and two for bookkeeping; Read and Write are blocking. The Bluetooth stack uses these functions to send Bluetooth commands and data packets, and receive data packets and events.
This interface is defined by Bt_hcip.h. The following topics discuss the HCI transport layer in more detail: