From: Robin C. <co...@cl...> - 2011-07-29 17:49:41
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Hi Everyone. The Altera Quartus II project that generated the Cyclone FPGA bitstream called std_inband.rbf that is distributed with OpenBTS in the Transceiver and Transceiver52M directories is MIA. I've finally gotten around to recreating a full Quartus II project that generates a bitstream called usrp_openbts.rbf that works with a USRP1 Rev. 4 outfitted with a 52 MHz clock. You can download the project from github: https://github.com/closehaulcom/usrp1_openbts The design is almost identical to the usrp_inband_usb files distributed in UHD by Ettus Research. The timestamp counter in the verilog files tx_buffer_inband.v and rx_buffer_inband.v needs to be incremented at the GSM symbol rate, not the FPGA clock rate (52 MHz) in order to play nicely with OpenBTS. Please refer to the README file for instructions on where to copy the FPGA bitstream and for the minor modifications necessary to OpenBTS for use with usrp_openbts.rbf. This design is provided as a public service only-- I don't have much time or inclination to support it. Use it at your own risk etc... -Robin |
From: Alexander C. <ale...@gm...> - 2011-08-01 15:50:22
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Robin, That's great work, thank you very much. I've added this to the wiki: http://gnuradio.org/redmine/projects/gnuradio/wiki/USRP_inband_FPGA On Fri, Jul 29, 2011 at 21:49, Robin Coxe <co...@cl...> wrote: > Hi Everyone. The Altera Quartus II project that generated the Cyclone > FPGA bitstream called std_inband.rbf that is distributed with OpenBTS > in the Transceiver and Transceiver52M directories is MIA. I've > finally gotten around to recreating a full Quartus II project that > generates a bitstream called usrp_openbts.rbf that works with a USRP1 > Rev. 4 outfitted with a 52 MHz clock. You can download the project > from github: https://github.com/closehaulcom/usrp1_openbts > > The design is almost identical to the usrp_inband_usb files > distributed in UHD by Ettus Research. The timestamp counter in the > verilog files tx_buffer_inband.v and rx_buffer_inband.v needs to be > incremented at the GSM symbol rate, not the FPGA clock rate (52 MHz) > in order to play nicely with OpenBTS. > > Please refer to the README file for instructions on where to copy the > FPGA bitstream and for the minor modifications necessary to OpenBTS > for use with usrp_openbts.rbf. > > This design is provided as a public service only-- I don't have much > time or inclination to support it. Use it at your own risk etc... > > -Robin > > ------------------------------------------------------------------------------ > Got Input? Slashdot Needs You. > Take our quick survey online. Come on, we don't ask for help often. > Plus, you'll get a chance to win $100 to spend on ThinkGeek. > http://p.sf.net/sfu/slashdot-survey > _______________________________________________ > Openbts-discuss mailing list > Ope...@li... > https://lists.sourceforge.net/lists/listinfo/openbts-discuss > -- Regards, Alexander Chemeris. |