--- title: USB for Software Developers | daily.dev description: A practical introduction to USB for software developers who want to write userspace drivers without touching kernel code. Using an Android phone in bootloader... canonical: https://daily.dev/posts/usb-for-software-developers-4nurp8au8 twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: USB for Software Developers | daily.dev og:description: A practical introduction to USB for software developers who want to write userspace drivers without touching kernel code. Using an Android phone in bootloader... og:url: https://daily.dev/posts/usb-for-software-developers-4nurp8au8 og:image: https://api.daily.dev/og/posts/4NuRp8AU8.png og:image:alt: USB for Software Developers og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # USB for Software Developers **[Hacker News](https://daily.dev/sources/hn)** · 14 min read · 3 upvotes · 0 comments ## Summary A practical introduction to USB for software developers who want to write userspace drivers without touching kernel code. Using an Android phone in bootloader mode as the example device, it walks through USB enumeration, VID/PID identification with lsusb, and using libusb to detect and communicate with the device from userspace. Covers USB concepts including descriptors, endpoint types (Control, Bulk, Interrupt, Isochronous), IN/OUT directions, and finally implements a simple Fastboot protocol client that sends commands and reads responses over Bulk endpoints. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [USB, Abstracted](https://daily.dev/posts/usb-abstracted-rftkbghtp) · Hackaday · 1 upvotes · 0 comments - [USB for Software Developers: an introduction to writing userspace USB drivers](https://daily.dev/posts/usb-for-software-developers-an-introduction-to-writing-userspace-usb-drivers-y5bylphzx) · Adafruit Blog · 0 upvotes · 0 comments --- Tags: [#linux](https://daily.dev/tags/linux), [#hardware](https://daily.dev/tags/hardware) [View this post on daily.dev](https://daily.dev/posts/usb-for-software-developers-4nurp8au8) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"USB for Software Developers","url":"https://daily.dev/posts/usb-for-software-developers-4nurp8au8","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/usb-for-software-developers-4nurp8au8"},"datePublished":"2026-04-08T21:39:25.546Z","dateModified":"2026-04-08T21:39:48.511Z","description":"A practical introduction to USB for software developers who want to write userspace drivers without touching kernel code. 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