cyw43012-ble-RTT/btstack-integration/COMPONENT_HCI-UART

# AIROC™ Bluetooth® Host Stack solution (for FreeRTOS)

Overview

AIROC™ Bluetooth® host stack solution includes Bluetooth® stack library, Bluetooth® controller firmware and platform/os porting layer. Bluetooth® stack library is designed for embedded device, it consumes less RAM/ROM usage but still keeps high performance. With AIROC™ Bluetooth® API set, application developers can use them easily to create their own application. The porting layer is implemented by CYHAL and CY_RTOS_AL (Hardware/Operation System Adaptation Layer), hence it can adapt to Cypress platforms, and easy to port to other vendor's platform.

Working flow

~ release-v1.3.0

• Porting layer create 2 tasks
  • HCI task which handles HCI packet transmission and reception
  • BTU/BT task which handles Bluetooth® core stack and profiles
• TX path:
  • Bluetooth® stack calls pf_write_xxx_to_lower( ) with packet data
  • Inside those functions,
    • Allocate memory from porting layer heap for the TX packet
    • Put TX packet into HCI task queue
  • HCI task gets TX packet from the queue then write the same to HCI UART
• RX path:
  • UART driver fires the interrupt when data was coming from Bluetooth® controller
  • In IRQ handler, put the related message to HCI task queue
  • Once HCI task gets the message,
    • Allocate memory from porting layer heap, read the packet from UART and write the same to the allocated memory
    • Put RX packet into Bluetooth® task queue.
  • Bluetooth® task gets RX packet then calls wiced_bt_process_xxx() to notify Bluetooth® stack

since release-v2.0.0

• Porting layer create 2 tasks
  • HCI_TX task which handles HCI packet from Bluetooth® stack to Bluetooth® controller
  • HCI_RX task which handles HCI packet from Bluetooth® controller to Bluetooth® stack
• TX path:
  • Bluetooth® stack calls pf_write_xxx_to_lower() with packet data
  • Inside those functions,
    • Allocate memory from porting layer heap for the TX packet
    • Put TX packet into HCI_TX task queue
  • HCI_TX task gets TX packet from the queue then write the same to HCI UART
• RX path:
  • UART driver fires the interrupt when data was coming from Bluetooth® controller
  • In IRQ handler, put the related message to HCI_RX task queue
  • Once HCI_RX task gets the message,
    • Read the packet from UART and write the same to the static buffer
    • Call wiced_bt_process_xxx() to notify Bluetooth® stack

API Reference Manual

• Bluetooth® platform API manual
• Bluetooth® stack BLE API manual
  

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