![]() ![]() Control endpoint is endpoint 0 and all USB devices shall have at least endpoint 0. There are 4 types of USB endpoints: control, bulk, iso and interrupt. At the device side the endpoints are (hardware) FIFO queues associated with the UDC. In USB all communication is performed through so called endpoints. What you need to know before using FunctionFS This way, USB out traffic (from host) is available at a file descriptor ready for reading, and USB in traffic (to host) is accepted at a file descriptor ready for writing. The idea is to delegate actual USB function implementation to userspace, using a filesystem interface (read()/write() etc). In this post, we look at how to implement your very own USB function with FunctionFS and how to integrate that with systemd. We also talked about modern style of USB gadget creation and integrating that with systemd. In the previous post I introduced you to the subject of USB gadgets implemented as machines running Linux. ![]()
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