:orphan:

.. title:: BT_CTLR_TX_BUFFERS

.. option:: CONFIG_BT_CTLR_TX_BUFFERS

*Number of Tx buffers*

Type: ``int``

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
===================

\ :option:`BT_CTLR <CONFIG_BT_CTLR>` && \ :option:`BT_HCI <CONFIG_BT_HCI>` && \ :option:`BT <CONFIG_BT>`

*(Includes any dependencies from ifs and menus.)*

Defaults
========

- 7 if \ :option:`BT_HCI_RAW <CONFIG_BT_HCI_RAW>`
- 3

Kconfig definition
==================

.. highlight:: kconfig

At ``subsys/bluetooth/controller/Kconfig:175``

Included via ``Kconfig:8`` → ``Kconfig.zephyr:34`` → ``subsys/Kconfig:9`` → ``subsys/bluetooth/Kconfig:240``

Menu path: (Top) → Sub Systems and OS Services → Bluetooth → Bluetooth Controller

.. parsed-literal::

    config BT_CTLR_TX_BUFFERS
    	int "Number of Tx buffers"
    	range 1 19
    	default 7 if \ :option:`BT_HCI_RAW <CONFIG_BT_HCI_RAW>`
    	default 3
    	depends on \ :option:`BT_CTLR <CONFIG_BT_CTLR>` && \ :option:`BT_HCI <CONFIG_BT_HCI>` && \ :option:`BT <CONFIG_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.

*(The 'depends on' condition includes propagated dependencies from ifs and menus.)*