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usb_host: Update docs and comments regarding first configuration enumeration

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This commit updates some comments and documentation regarding changes made in
PR https://github.com/espressif/esp-idf/pull/11113.
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Darian Leung
2023-04-17 17:06:54 +08:00
parent 8bebfaa6ee
commit fd2d4a83e2
2 changed files with 2 additions and 2 deletions
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docs/en/api-reference/peripherals/usb_host.rst
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@@ -90,7 +90,7 @@ Therefore, in addition to the client tasks, the Host Library also requires a tas
Devices
^^^^^^^
The Host Library hides the details of device handling (such as connection, memory allocation, and enumeration) from the clients. The clients are provided only with a list of already connected and enumerated devices to choose from. During enumeration, each device is configured to use configuration 1.
The Host Library hides the details of device handling (such as connection, memory allocation, and enumeration) from the clients. The clients are provided only with a list of already connected and enumerated devices to choose from. During enumeration, each device is automatically configured to use the first configuration found (i.e., the first configuration descriptor returned on a Get Configuration Descriptor request). For most standard devices, the first configuration will have a ``bConfigurationValue`` of ``1``.
It is possible for a two or more clients to simultaneously communicate with the same device as long as they are not communicating to the same interface. However, multiple clients can simultaneously communicate with the same device's default endpoint (EP0), which will result in their control transfers being serialized.