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feat(docs): added USB Host Stack Configuration description

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Roman Leonov 2023-10-19 09:58:52 +02:00 committed by Peter Marcisovsky
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docs/en/api-reference/peripherals/usb_host.rst
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@ -376,6 +376,47 @@ MSC
* A host class driver for the Mass Storage Class (Bulk-Only Transport) is current implemented as an example found via :example:`peripherals/usb/host/msc`.
.. ---------------------------------------------- USB Host Menuconfig --------------------------------------------------
Host Stack Configuration
------------------------
Non-Compliant Device Support
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
To support USB devices that are non-compliant in various scenarios or exhibit specific behaviors it is possible to configure the USB Host stack.
As a USB device may be hot-plugged, it is essential to have the configurable delays between power switching and device attachment, and when the device's internal power has stabilized.
Enumeration Configuration
"""""""""""""""""""""""""
During the process of enumerating connected USB devices, several timeout values ensure the proper functioning of the device.
.. figure:: ../../../_static/usb_host/poweron-timings.png
:align: center
:alt: USB Root Hub Power-on and Connection Events Timing
:figclass: align-center
USB Root Hub Power-on and Connection Events Timing
The figure above shows all the timeouts associated with both turning on port power with a device connected and hot-plugging a device.
* After a port is reset or resumed, the USB System Software is expected to provide a “recovery” interval of 10 ms before the device attached to the port is expected to respond to data transfers.
* After the reset/resume recovery interval, if a device receives a SetAddress() request, the device must be able to complete processing of the request and be able to successfully complete the Status stage of the request within 50 ms.
* After successful completion of the Status stage, the device is allowed a SetAddress() recovery interval of 2 ms.
.. note::
For more details regarding connection event timings, please refer to the Universal Serial Bus 2.0 specification, chapter 7.1.7.3 "Connect and Disconnect Signaling".
Configurable parameters of the USB host stack can be configured with multiple options via Menuconfig.
* For Debounce delay refer to :ref:`CONFIG_USB_HOST_DEBOUNCE_DELAY_MS`
* For Reset hold interval refer to :ref:`CONFIG_USB_HOST_RESET_HOLD_MS`
* For Reset recovery interval refer to :ref:`CONFIG_USB_HOST_RESET_RECOVERY_MS`
* Fer SetAddress() recovery interval refer to: :ref:`CONFIG_USB_HOST_SET_ADDR_RECOVERY_MS`
.. -------------------------------------------------- API Reference ----------------------------------------------------
API Reference