Help¶

Set the number of Tx PDUs to be queued for transmission in the controller. In a 7.5ms connection interval and 2M PHY, maximum 19 packets can be enqueued, with 18 packets with L2CAP payload size of 1 byte can be acknowledged.

Direct dependencies¶

BT_LL_SW && BT_CTLR && BT_HCI && BT

(Includes any dependencies from if’s and menus.)

Defaults¶

7 if BT_HCI_RAW && BT_LL_SW && BT_CTLR && BT_HCI && BT
2 if BT_LL_SW && BT_CTLR && BT_HCI && BT

Kconfig definition¶

At subsys/bluetooth/controller/Kconfig:91

Included via Kconfig:10 → Kconfig.zephyr:35 → subsys/Kconfig:8 → subsys/bluetooth/Kconfig:156

Menu path: (top menu) → Bluetooth

config BT_CTLR_TX_BUFFERS
    int
    prompt "Number of Tx buffers" if BT_LL_SW && BT_CTLR && BT_HCI && BT
    range 1 19 if BT_LL_SW && BT_CTLR && BT_HCI && BT
    default 7 if BT_HCI_RAW && BT_LL_SW && BT_CTLR && BT_HCI && BT
    default 2 if BT_LL_SW && BT_CTLR && BT_HCI && BT
    depends on BT_LL_SW && BT_CTLR && BT_HCI && BT
    help
      Set the number of Tx PDUs to be queued for transmission in the
      controller. In a 7.5ms connection interval and 2M PHY, maximum 19
      packets can be enqueued, with 18 packets with L2CAP payload size of 1
      byte can be acknowledged.

(Definitions include propagated dependencies, including from if’s and menus.)