iCE40 E1 USB interface¶

This page is the main entry point for the E1 Software defined interface using the iCE40 FPGA as the core.

Architecture¶

TODO

Current stack¶

• The hardware is currently not documented, only 2 prototypes exists and have been half hand-wired. They are currently based off iCEBreaker and iCEBreaker-bitsy iCE40 dev boards. ( https://github.com/icebreaker-fpga/icebreaker )
• The gateware is temporarily hosted in the 'e1' branch of this repo : https://github.com/smunaut/ice40-playground/tree/e1/projects/riscv_usb
• The embedded software is in the same repository as above, in the 'fw' sub-directory : https://github.com/smunaut/ice40-playground/tree/e1/projects/riscv_usb/fw
• The userspace daemon that handles the USB communication is hosted at: http://git.osmocom.org/osmo-e1d
• The support for this daemon interface to the rest of the cellular stack is in a 'tnt/e1d' branch of the libosmo-abis repo : http://git.osmocom.org/libosmo-abis/log/?h=tnt/e1d

Presentations¶

• Talk from OsmoCon 2018 about the Software Defined E1 project as a whole : osmocon_2018_e1.pdf
• Talk from OsmoDevCon 2019 about the iCE40 based solution specifically: osmodevcon_2019_e1.pdf