AVR-USB implements a USB device entirely in software, making it possible to build USB hardware with almost any AVR microcontroller, not requiring any additional chip.
Features :
- Fully USB 1.1 compliant low-speed device, except handling of communication errors and electrical specifications.
- Example projects demonstrate device and host driver implementations on Linux, Mac OS X and Windows.
- Supports multiple endpoints: one control endpoint, two interrupt/bulk-in endpoints and up to 7 interrupt/bulk-out endpoints. (Bulk endpoints are forbidden for low speed devices by the USB standard.)
- Transfer sizes up to 254 bytes by default, more as configuration option.
- Comes with freely usable USB identifiers (Vendor-ID and Product-ID pairs).
- Runs on any AVR microcontroller with at least 2 kB of Flash memory, 128 bytes RAM and a clock rate of at least 12 MHz.
- No UART, timer, input capture unit or other special hardware is required (except one edge triggered interrupt).
- Can be clocked with 12 Mhz, 15 MHz, 16 MHz or 20 MHz crystal or from a 16.5 MHz internal RC oscillator.
- High level functionality is written in C and is well commented.
- Only about 1200 to 1400 bytes code size.
tags : Microcontroller Project, AVR, USB (src)
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