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diff --git a/c-user/config/device-driver.rst b/c-user/config/device-driver.rst new file mode 100644 index 0000000..1e31575 --- /dev/null +++ b/c-user/config/device-driver.rst @@ -0,0 +1,888 @@ +.. SPDX-License-Identifier: CC-BY-SA-4.0 + +.. Copyright (C) 2020, 2021 embedded brains GmbH & Co. KG +.. Copyright (C) 1988, 2021 On-Line Applications Research Corporation (OAR) + +.. This file is part of the RTEMS quality process and was automatically +.. generated. If you find something that needs to be fixed or +.. worded better please post a report or patch to an RTEMS mailing list +.. or raise a bug report: +.. +.. https://www.rtems.org/bugs.html +.. +.. For information on updating and regenerating please refer to the How-To +.. section in the Software Requirements Engineering chapter of the +.. RTEMS Software Engineering manual. The manual is provided as a part of +.. a release. For development sources please refer to the online +.. documentation at: +.. +.. https://docs.rtems.org + +.. Generated from spec:/acfg/if/group-devdrv + +Device Driver Configuration +=========================== + +This section describes configuration options related to the device drivers. +Note that network device drivers are not covered by the following options. + +.. Generated from spec:/acfg/if/appl-does-not-need-clock-driver + +.. raw:: latex + + \clearpage + +.. index:: CONFIGURE_APPLICATION_DOES_NOT_NEED_CLOCK_DRIVER + +.. _CONFIGURE_APPLICATION_DOES_NOT_NEED_CLOCK_DRIVER: + +CONFIGURE_APPLICATION_DOES_NOT_NEED_CLOCK_DRIVER +------------------------------------------------ + +.. rubric:: CONSTANT: + +``CONFIGURE_APPLICATION_DOES_NOT_NEED_CLOCK_DRIVER`` + +.. rubric:: OPTION TYPE: + +This configuration option is a boolean feature define. + +.. rubric:: DEFAULT CONFIGURATION: + +If this configuration option is undefined, then a Clock Driver may be +initialized during system initialization. + +.. rubric:: DESCRIPTION: + +In case this configuration option is defined, then **no** Clock Driver is +initialized during system initialization. + +.. rubric:: NOTES: + +This configuration parameter is intended to prevent the common user error +of using the Hello World example as the baseline for an application and +leaving out a clock tick source. + +The application shall define exactly one of the following configuration options + +* :ref:`CONFIGURE_APPLICATION_NEEDS_CLOCK_DRIVER`, + +* ``CONFIGURE_APPLICATION_DOES_NOT_NEED_CLOCK_DRIVER``, or + +* :ref:`CONFIGURE_APPLICATION_NEEDS_TIMER_DRIVER`, + +otherwise a compile time error in the configuration file will occur. + +.. Generated from spec:/acfg/if/appl-extra-drivers + +.. raw:: latex + + \clearpage + +.. index:: CONFIGURE_APPLICATION_EXTRA_DRIVERS + +.. _CONFIGURE_APPLICATION_EXTRA_DRIVERS: + +CONFIGURE_APPLICATION_EXTRA_DRIVERS +----------------------------------- + +.. rubric:: CONSTANT: + +``CONFIGURE_APPLICATION_EXTRA_DRIVERS`` + +.. rubric:: OPTION TYPE: + +This configuration option is an initializer define. + +.. rubric:: DEFAULT VALUE: + +The default value is the empty list. + +.. rubric:: DESCRIPTION: + +The value of this configuration option is used to initialize the Device +Driver Table. + +.. rubric:: NOTES: + +The value of this configuration option is placed after the entries of other +device driver configuration options. + +See :ref:`CONFIGURE_APPLICATION_PREREQUISITE_DRIVERS` for an alternative +placement of application device driver initializers. + +.. rubric:: CONSTRAINTS: + +The value of the configuration option shall be a list of initializers for +structures of type :ref:`InterfaceRtemsDriverAddressTable`. + +.. Generated from spec:/acfg/if/appl-needs-ata-driver + +.. raw:: latex + + \clearpage + +.. index:: CONFIGURE_APPLICATION_NEEDS_ATA_DRIVER + +.. _CONFIGURE_APPLICATION_NEEDS_ATA_DRIVER: + +CONFIGURE_APPLICATION_NEEDS_ATA_DRIVER +-------------------------------------- + +.. rubric:: CONSTANT: + +``CONFIGURE_APPLICATION_NEEDS_ATA_DRIVER`` + +.. rubric:: OPTION TYPE: + +This configuration option is a boolean feature define. + +.. rubric:: DEFAULT CONFIGURATION: + +If this configuration option is undefined, then the described feature is not +enabled. + +.. rubric:: DESCRIPTION: + +In case this configuration option is defined, then the ATA Driver is +initialized during system initialization. + +.. rubric:: NOTES: + +Most BSPs do not include support for an ATA Driver. + +If this option is defined and the BSP does not have this device driver, then +the user will get a link time error for an undefined symbol. + +.. Generated from spec:/acfg/if/appl-needs-clock-driver + +.. raw:: latex + + \clearpage + +.. index:: CONFIGURE_APPLICATION_NEEDS_CLOCK_DRIVER + +.. _CONFIGURE_APPLICATION_NEEDS_CLOCK_DRIVER: + +CONFIGURE_APPLICATION_NEEDS_CLOCK_DRIVER +---------------------------------------- + +.. rubric:: CONSTANT: + +``CONFIGURE_APPLICATION_NEEDS_CLOCK_DRIVER`` + +.. rubric:: OPTION TYPE: + +This configuration option is a boolean feature define. + +.. rubric:: DEFAULT CONFIGURATION: + +If this configuration option is undefined, then the described feature is not +enabled. + +.. rubric:: DESCRIPTION: + +In case this configuration option is defined, then the Clock Driver is +initialized during system initialization. + +.. rubric:: NOTES: + +The Clock Driver is responsible for providing a regular interrupt +which invokes a clock tick directive. + +The application shall define exactly one of the following configuration options + +* ``CONFIGURE_APPLICATION_NEEDS_CLOCK_DRIVER``, + +* :ref:`CONFIGURE_APPLICATION_DOES_NOT_NEED_CLOCK_DRIVER`, or + +* :ref:`CONFIGURE_APPLICATION_NEEDS_TIMER_DRIVER`, + +otherwise a compile time error in the configuration file will occur. + +.. Generated from spec:/acfg/if/appl-needs-console-driver + +.. raw:: latex + + \clearpage + +.. index:: CONFIGURE_APPLICATION_NEEDS_CONSOLE_DRIVER + +.. _CONFIGURE_APPLICATION_NEEDS_CONSOLE_DRIVER: + +CONFIGURE_APPLICATION_NEEDS_CONSOLE_DRIVER +------------------------------------------ + +.. rubric:: CONSTANT: + +``CONFIGURE_APPLICATION_NEEDS_CONSOLE_DRIVER`` + +.. rubric:: OPTION TYPE: + +This configuration option is a boolean feature define. + +.. rubric:: DEFAULT CONFIGURATION: + +If this configuration option is undefined, then the described feature is not +enabled. + +.. rubric:: DESCRIPTION: + +In case this configuration option is defined, then the Console Driver is +initialized during system initialization. + +.. rubric:: NOTES: + +The Console Driver is responsible for providing the :file:`/dev/console` +device file. This device is used to initialize the standard input, output, +and error file descriptors. + +BSPs should be constructed in a manner that allows :ref:`InterfacePrintk` to work +properly without the need for the Console Driver to be configured. + +The + +* ``CONFIGURE_APPLICATION_NEEDS_CONSOLE_DRIVER``, + +* :ref:`CONFIGURE_APPLICATION_NEEDS_SIMPLE_CONSOLE_DRIVER`, and + +* :ref:`CONFIGURE_APPLICATION_NEEDS_SIMPLE_TASK_CONSOLE_DRIVER` + +configuration options are mutually exclusive. + +.. Generated from spec:/acfg/if/appl-needs-framebuffer-driver + +.. raw:: latex + + \clearpage + +.. index:: CONFIGURE_APPLICATION_NEEDS_FRAME_BUFFER_DRIVER + +.. _CONFIGURE_APPLICATION_NEEDS_FRAME_BUFFER_DRIVER: + +CONFIGURE_APPLICATION_NEEDS_FRAME_BUFFER_DRIVER +----------------------------------------------- + +.. rubric:: CONSTANT: + +``CONFIGURE_APPLICATION_NEEDS_FRAME_BUFFER_DRIVER`` + +.. rubric:: OPTION TYPE: + +This configuration option is a boolean feature define. + +.. rubric:: DEFAULT CONFIGURATION: + +If this configuration option is undefined, then the described feature is not +enabled. + +.. rubric:: DESCRIPTION: + +In case this configuration option is defined, then the Frame Buffer Driver is +initialized during system initialization. + +.. rubric:: NOTES: + +Most BSPs do not include support for a Frame Buffer Driver. This is +because many boards do not include the required hardware. + +If this option is defined and the BSP does not have this device driver, then +the user will get a link time error for an undefined symbol. + +.. Generated from spec:/acfg/if/appl-needs-ide-driver + +.. raw:: latex + + \clearpage + +.. index:: CONFIGURE_APPLICATION_NEEDS_IDE_DRIVER + +.. _CONFIGURE_APPLICATION_NEEDS_IDE_DRIVER: + +CONFIGURE_APPLICATION_NEEDS_IDE_DRIVER +-------------------------------------- + +.. rubric:: CONSTANT: + +``CONFIGURE_APPLICATION_NEEDS_IDE_DRIVER`` + +.. rubric:: OPTION TYPE: + +This configuration option is a boolean feature define. + +.. rubric:: DEFAULT CONFIGURATION: + +If this configuration option is undefined, then the described feature is not +enabled. + +.. rubric:: DESCRIPTION: + +In case this configuration option is defined, then the IDE Driver is +initialized during system initialization. + +.. rubric:: NOTES: + +Most BSPs do not include support for an IDE Driver. + +If this option is defined and the BSP does not have this device driver, then +the user will get a link time error for an undefined symbol. + +.. Generated from spec:/acfg/if/appl-needs-null-driver + +.. raw:: latex + + \clearpage + +.. index:: CONFIGURE_APPLICATION_NEEDS_NULL_DRIVER +.. index:: /dev/null + +.. _CONFIGURE_APPLICATION_NEEDS_NULL_DRIVER: + +CONFIGURE_APPLICATION_NEEDS_NULL_DRIVER +--------------------------------------- + +.. rubric:: CONSTANT: + +``CONFIGURE_APPLICATION_NEEDS_NULL_DRIVER`` + +.. rubric:: OPTION TYPE: + +This configuration option is a boolean feature define. + +.. rubric:: DEFAULT CONFIGURATION: + +If this configuration option is undefined, then the described feature is not +enabled. + +.. rubric:: DESCRIPTION: + +In case this configuration option is defined, then the :file:`/dev/null` +Driver is initialized during system initialization. + +.. rubric:: NOTES: + +This device driver is supported by all BSPs. + +.. Generated from spec:/acfg/if/appl-needs-rtc-driver + +.. raw:: latex + + \clearpage + +.. index:: CONFIGURE_APPLICATION_NEEDS_RTC_DRIVER + +.. _CONFIGURE_APPLICATION_NEEDS_RTC_DRIVER: + +CONFIGURE_APPLICATION_NEEDS_RTC_DRIVER +-------------------------------------- + +.. rubric:: CONSTANT: + +``CONFIGURE_APPLICATION_NEEDS_RTC_DRIVER`` + +.. rubric:: OPTION TYPE: + +This configuration option is a boolean feature define. + +.. rubric:: DEFAULT CONFIGURATION: + +If this configuration option is undefined, then the described feature is not +enabled. + +.. rubric:: DESCRIPTION: + +In case this configuration option is defined, then the Real-Time Clock Driver +is initialized during system initialization. + +.. rubric:: NOTES: + +Most BSPs do not include support for a real-time clock (RTC). This is because +many boards do not include the required hardware. + +If this is defined and the BSP does not have this device driver, then the +user will get a link time error for an undefined symbol. + +.. Generated from spec:/acfg/if/appl-needs-simple-console-driver + +.. raw:: latex + + \clearpage + +.. index:: CONFIGURE_APPLICATION_NEEDS_SIMPLE_CONSOLE_DRIVER + +.. _CONFIGURE_APPLICATION_NEEDS_SIMPLE_CONSOLE_DRIVER: + +CONFIGURE_APPLICATION_NEEDS_SIMPLE_CONSOLE_DRIVER +------------------------------------------------- + +.. rubric:: CONSTANT: + +``CONFIGURE_APPLICATION_NEEDS_SIMPLE_CONSOLE_DRIVER`` + +.. rubric:: OPTION TYPE: + +This configuration option is a boolean feature define. + +.. rubric:: DEFAULT CONFIGURATION: + +If this configuration option is undefined, then the described feature is not +enabled. + +.. rubric:: DESCRIPTION: + +In case this configuration option is defined, then the Simple Console Driver +is initialized during system initialization. + +.. rubric:: NOTES: + +This device driver is responsible for providing the :file:`/dev/console` +device file. This device is used to initialize the standard input, output, +and error file descriptors. + +This device driver reads via :ref:`InterfaceGetchark`. + +This device driver writes via :ref:`InterfaceRtemsPutc`. + +The Termios framework is not used. There is no support to change device +settings, e.g. baud, stop bits, parity, etc. + +The + +* :ref:`CONFIGURE_APPLICATION_NEEDS_CONSOLE_DRIVER`, + +* ``CONFIGURE_APPLICATION_NEEDS_SIMPLE_CONSOLE_DRIVER``, and + +* :ref:`CONFIGURE_APPLICATION_NEEDS_SIMPLE_TASK_CONSOLE_DRIVER` + +configuration options are mutually exclusive. + +.. Generated from spec:/acfg/if/appl-needs-simple-task-console-driver + +.. raw:: latex + + \clearpage + +.. index:: CONFIGURE_APPLICATION_NEEDS_SIMPLE_TASK_CONSOLE_DRIVER + +.. _CONFIGURE_APPLICATION_NEEDS_SIMPLE_TASK_CONSOLE_DRIVER: + +CONFIGURE_APPLICATION_NEEDS_SIMPLE_TASK_CONSOLE_DRIVER +------------------------------------------------------ + +.. rubric:: CONSTANT: + +``CONFIGURE_APPLICATION_NEEDS_SIMPLE_TASK_CONSOLE_DRIVER`` + +.. rubric:: OPTION TYPE: + +This configuration option is a boolean feature define. + +.. rubric:: DEFAULT CONFIGURATION: + +If this configuration option is undefined, then the described feature is not +enabled. + +.. rubric:: DESCRIPTION: + +In case this configuration option is defined, then the Simple Task Console +Driver is initialized during system initialization. + +.. rubric:: NOTES: + +This device driver is responsible for providing the :file:`/dev/console` +device file. This device is used to initialize the standard input, output, +and error file descriptors. + +This device driver reads via :ref:`InterfaceGetchark`. + +This device driver writes into a write buffer. The count of characters +written into the write buffer is returned. It might be less than the +requested count, in case the write buffer is full. The write is +non-blocking and may be called from interrupt context. A dedicated task +reads from the write buffer and outputs the characters via +:ref:`InterfaceRtemsPutc`. This task runs with the least important priority. +The write buffer size is 2047 characters and it is not configurable. + +Use ``fsync( STDOUT_FILENO )`` or ``fdatasync( STDOUT_FILENO )`` to drain the +write buffer. + +The Termios framework is not used. There is no support to change device +settings, e.g. baud, stop bits, parity, etc. + +The + +* :ref:`CONFIGURE_APPLICATION_NEEDS_CONSOLE_DRIVER`, + +* :ref:`CONFIGURE_APPLICATION_NEEDS_SIMPLE_CONSOLE_DRIVER`, and + +* ``CONFIGURE_APPLICATION_NEEDS_SIMPLE_TASK_CONSOLE_DRIVER`` + +configuration options are mutually exclusive. + +.. Generated from spec:/acfg/if/appl-needs-stub-driver + +.. raw:: latex + + \clearpage + +.. index:: CONFIGURE_APPLICATION_NEEDS_STUB_DRIVER + +.. _CONFIGURE_APPLICATION_NEEDS_STUB_DRIVER: + +CONFIGURE_APPLICATION_NEEDS_STUB_DRIVER +--------------------------------------- + +.. rubric:: CONSTANT: + +``CONFIGURE_APPLICATION_NEEDS_STUB_DRIVER`` + +.. rubric:: OPTION TYPE: + +This configuration option is a boolean feature define. + +.. rubric:: DEFAULT CONFIGURATION: + +If this configuration option is undefined, then the described feature is not +enabled. + +.. rubric:: DESCRIPTION: + +In case this configuration option is defined, then the Stub Driver is +initialized during system initialization. + +.. rubric:: NOTES: + +This device driver simply provides entry points that return successful and +is primarily a test fixture. It is supported by all BSPs. + +.. Generated from spec:/acfg/if/appl-needs-timer-driver + +.. raw:: latex + + \clearpage + +.. index:: CONFIGURE_APPLICATION_NEEDS_TIMER_DRIVER + +.. _CONFIGURE_APPLICATION_NEEDS_TIMER_DRIVER: + +CONFIGURE_APPLICATION_NEEDS_TIMER_DRIVER +---------------------------------------- + +.. rubric:: CONSTANT: + +``CONFIGURE_APPLICATION_NEEDS_TIMER_DRIVER`` + +.. rubric:: OPTION TYPE: + +This configuration option is a boolean feature define. + +.. rubric:: DEFAULT CONFIGURATION: + +If this configuration option is undefined, then the described feature is not +enabled. + +.. rubric:: DESCRIPTION: + +In case this configuration option is defined, then the Benchmark Timer Driver is +initialized during system initialization. + +.. rubric:: NOTES: + +The Benchmark Timer Driver is intended for the benchmark tests of the RTEMS +Testsuite. Applications should not use this driver. + +The application shall define exactly one of the following configuration options + +* :ref:`CONFIGURE_APPLICATION_NEEDS_CLOCK_DRIVER`, + +* :ref:`CONFIGURE_APPLICATION_DOES_NOT_NEED_CLOCK_DRIVER`, or + +* ``CONFIGURE_APPLICATION_NEEDS_TIMER_DRIVER``, + +otherwise a compile time error will occur. + +.. Generated from spec:/acfg/if/appl-needs-watchdog-driver + +.. raw:: latex + + \clearpage + +.. index:: CONFIGURE_APPLICATION_NEEDS_WATCHDOG_DRIVER + +.. _CONFIGURE_APPLICATION_NEEDS_WATCHDOG_DRIVER: + +CONFIGURE_APPLICATION_NEEDS_WATCHDOG_DRIVER +------------------------------------------- + +.. rubric:: CONSTANT: + +``CONFIGURE_APPLICATION_NEEDS_WATCHDOG_DRIVER`` + +.. rubric:: OPTION TYPE: + +This configuration option is a boolean feature define. + +.. rubric:: DEFAULT CONFIGURATION: + +If this configuration option is undefined, then the described feature is not +enabled. + +.. rubric:: DESCRIPTION: + +In case this configuration option is defined, then the Watchdog Driver is +initialized during system initialization. + +.. rubric:: NOTES: + +Most BSPs do not include support for a watchdog device driver. This is +because many boards do not include the required hardware. + +If this is defined and the BSP does not have this device driver, then the +user will get a link time error for an undefined symbol. + +.. Generated from spec:/acfg/if/appl-needs-zero-driver + +.. raw:: latex + + \clearpage + +.. index:: CONFIGURE_APPLICATION_NEEDS_ZERO_DRIVER +.. index:: /dev/zero + +.. _CONFIGURE_APPLICATION_NEEDS_ZERO_DRIVER: + +CONFIGURE_APPLICATION_NEEDS_ZERO_DRIVER +--------------------------------------- + +.. rubric:: CONSTANT: + +``CONFIGURE_APPLICATION_NEEDS_ZERO_DRIVER`` + +.. rubric:: OPTION TYPE: + +This configuration option is a boolean feature define. + +.. rubric:: DEFAULT CONFIGURATION: + +If this configuration option is undefined, then the described feature is not +enabled. + +.. rubric:: DESCRIPTION: + +In case this configuration option is defined, then the :file:`/dev/zero` +Driver is initialized during system initialization. + +.. rubric:: NOTES: + +This device driver is supported by all BSPs. + +.. Generated from spec:/acfg/if/appl-prerequisite-drivers + +.. raw:: latex + + \clearpage + +.. index:: CONFIGURE_APPLICATION_PREREQUISITE_DRIVERS + +.. _CONFIGURE_APPLICATION_PREREQUISITE_DRIVERS: + +CONFIGURE_APPLICATION_PREREQUISITE_DRIVERS +------------------------------------------ + +.. rubric:: CONSTANT: + +``CONFIGURE_APPLICATION_PREREQUISITE_DRIVERS`` + +.. rubric:: OPTION TYPE: + +This configuration option is an initializer define. + +.. rubric:: DEFAULT VALUE: + +The default value is the empty list. + +.. rubric:: DESCRIPTION: + +The value of this configuration option is used to initialize the Device +Driver Table. + +.. rubric:: NOTES: + +The value of this configuration option is placed after the entries defined by +:c:macro:`CONFIGURE_BSP_PREREQUISITE_DRIVERS` and before all other device driver +configuration options. + +See :ref:`CONFIGURE_APPLICATION_EXTRA_DRIVERS` for an alternative placement +of application device driver initializers. + +.. rubric:: CONSTRAINTS: + +The value of the configuration option shall be a list of initializers for +structures of type :ref:`InterfaceRtemsDriverAddressTable`. + +.. Generated from spec:/acfg/if/ata-driver-task-priority + +.. raw:: latex + + \clearpage + +.. index:: CONFIGURE_ATA_DRIVER_TASK_PRIORITY + +.. _CONFIGURE_ATA_DRIVER_TASK_PRIORITY: + +CONFIGURE_ATA_DRIVER_TASK_PRIORITY +---------------------------------- + +.. rubric:: CONSTANT: + +``CONFIGURE_ATA_DRIVER_TASK_PRIORITY`` + +.. rubric:: OPTION TYPE: + +This configuration option is an integer define. + +.. rubric:: DEFAULT VALUE: + +The default value is 140. + +.. rubric:: DESCRIPTION: + +The value of this configuration option defines the ATA task priority. + +.. rubric:: NOTES: + +This configuration option is only evaluated if the configuration option +:ref:`CONFIGURE_APPLICATION_NEEDS_ATA_DRIVER` is defined. + +.. rubric:: CONSTRAINTS: + +The value of the configuration option shall be a valid Classic API task +priority. The set of valid task priorities depends on the scheduler +configuration. + +.. Generated from spec:/acfg/if/exception-to-signal-mapping + +.. raw:: latex + + \clearpage + +.. index:: CONFIGURE_EXCEPTION_TO_SIGNAL_MAPPING + +.. _CONFIGURE_EXCEPTION_TO_SIGNAL_MAPPING: + +CONFIGURE_EXCEPTION_TO_SIGNAL_MAPPING +------------------------------------- + +.. rubric:: CONSTANT: + +``CONFIGURE_EXCEPTION_TO_SIGNAL_MAPPING`` + +.. rubric:: OPTION TYPE: + +This configuration option is a boolean feature define. + +.. rubric:: DEFAULT CONFIGURATION: + +If this configuration option is undefined, then the described feature is not +enabled. + +.. rubric:: DESCRIPTION: + +In case this configuration option is defined, then the machine exception to +POSIX signal mapping is configured during system initialization. + +.. rubric:: NOTES: + +This device driver is responsible for setting up a mapping from machine +exceptions to POSIX signals so that applications may consume them and alter +task execution as necessary. + +This is especially useful for applications written in Ada or C++. + +.. Generated from spec:/acfg/if/max-drivers + +.. raw:: latex + + \clearpage + +.. index:: CONFIGURE_MAXIMUM_DRIVERS + +.. _CONFIGURE_MAXIMUM_DRIVERS: + +CONFIGURE_MAXIMUM_DRIVERS +------------------------- + +.. rubric:: CONSTANT: + +``CONFIGURE_MAXIMUM_DRIVERS`` + +.. rubric:: OPTION TYPE: + +This configuration option is an integer define. + +.. rubric:: DEFAULT VALUE: + +This is computed by default, and is set to the number of statically +configured device drivers configured using the following configuration +options: + +* :ref:`CONFIGURE_APPLICATION_EXTRA_DRIVERS` + +* :ref:`CONFIGURE_APPLICATION_NEEDS_ATA_DRIVER` + +* :ref:`CONFIGURE_APPLICATION_NEEDS_CLOCK_DRIVER` + +* :ref:`CONFIGURE_APPLICATION_NEEDS_CONSOLE_DRIVER` + +* :ref:`CONFIGURE_APPLICATION_NEEDS_FRAME_BUFFER_DRIVER` + +* :ref:`CONFIGURE_APPLICATION_NEEDS_IDE_DRIVER` + +* :ref:`CONFIGURE_APPLICATION_NEEDS_LIBBLOCK` + +* :ref:`CONFIGURE_APPLICATION_NEEDS_NULL_DRIVER` + +* :ref:`CONFIGURE_APPLICATION_NEEDS_RTC_DRIVER` + +* :ref:`CONFIGURE_APPLICATION_NEEDS_SIMPLE_CONSOLE_DRIVER` + +* :ref:`CONFIGURE_APPLICATION_NEEDS_SIMPLE_TASK_CONSOLE_DRIVER` + +* :ref:`CONFIGURE_APPLICATION_NEEDS_STUB_DRIVER` + +* :ref:`CONFIGURE_APPLICATION_NEEDS_TIMER_DRIVER` + +* :ref:`CONFIGURE_APPLICATION_NEEDS_WATCHDOG_DRIVER` + +* :ref:`CONFIGURE_APPLICATION_NEEDS_ZERO_DRIVER` + +* :ref:`CONFIGURE_APPLICATION_PREREQUISITE_DRIVERS` + +If the :ref:`CONFIGURE_DISABLE_BSP_SETTINGS` configuration option is not defined and +the :term:`BSP` provides +:c:macro:`CONFIGURE_BSP_PREREQUISITE_DRIVERS`, then the BSP-provided +prerequisite device drivers are also taken into account. + +.. rubric:: DESCRIPTION: + +The value of this configuration option defines the number of device drivers. + +.. rubric:: NOTES: + +If the application will dynamically install device drivers, then the +configuration option value shall be larger than the number of statically +configured device drivers. + +.. rubric:: CONSTRAINTS: + +The following constraints apply to this configuration option: + +* The value of the configuration option shall be less than or equal to + `SIZE_MAX <https://en.cppreference.com/w/c/types/limits>`_. + +* The value of the configuration option shall be greater than or equal than the + number of statically configured device drivers. + +* The value of the configuration option shall be less than or equal to a + BSP-specific and application-specific value which depends on the size of the + memory available to the application. |