# Where can I find the docs of USB API?

**URL:** <https://forum.amebaiot.com/t/where-can-i-find-the-docs-of-usb-api/2663>\
**Category:** USB\
**Tags:** rtl872xd\
**Created:** [February 2, 2024, 11:53am UTC](https://forum.amebaiot.com/t/where-can-i-find-the-docs-of-usb-api/2663 "2024-02-02T11:53:37Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![zjulic](https://avatars.discourse-cdn.com/v4/letter/z/e9bcb4/32.png) [@zjulic](https://forum.amebaiot.com/u/zjulic)\
**Post date:** [February 2, 2024, 11:53am UTC](https://forum.amebaiot.com/t/where-can-i-find-the-docs-of-usb-api/2663/1 "2024-02-02T11:53:37Z")

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I can’t find any documentation on USB API or USB stack. Where can I find them if I want to know the detailed information of the API functions like usbd\_init/usbd\_ep\_transmit?

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**Author:** ![M-ichae-l](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.amebaiot.com/m-ichae-l/32/33_2.png) [@M-ichae-l](https://forum.amebaiot.com/u/M-ichae-l)\
**Post date:** [February 5, 2024, 3:07am UTC](https://forum.amebaiot.com/t/where-can-i-find-the-docs-of-usb-api/2663/2 "2024-02-05T03:07:27Z")

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Under opensource SDK, please refer to [GitHub - ambiot/ambd\_sdk: Release SDK for AmebaD](https://github.com/ambiot/ambd_sdk/tree/dev) for all available documents.