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No USB? No problem.

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Logo of Chaos Computer Club e.V.Chaos Computer Club e.V.
 Cross, Sean "xobs"

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Title
No USB? No problem.
Subtitle
Grainuum: a Software- only USB Stack for 48 MHZ ARm Cortex MO+ CPUS.
Alternative Title
How to write an open source bit-bang low-speed USB stack running on a sub-$1 Cortex M0+
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Number of Parts
146
Author
License
CC Attribution 4.0 International:
You are free to use, adapt and copy, distribute and transmit the work or content in adapted or unchanged form for any legal purpose as long as the work is attributed to the author in the manner specified by the author or licensor.
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Abstract
How to get USB running on an ARM microcontroller that has no built in USB hardware. We'll cover electrical requirements, pin assignments, and microcontroller considerations, then move all the way up the stack to creating a bidirectional USB HID communications layer entirely in software.
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