Hello all, We're working on an open-source WiMAX receiver/scanner and we're looking into using a high-performance DSP to process data from USRP. Right now we implement this processing in FPGA, but we want to experiment with DSPs too. I know there are skilled people here and I'm looking forward to hear their opinion.
Note, that this project is not meant for starving students or occasional hobbyists. It is for high-profile hobbyists, targeted researchers and for small companies. So please refrain from comments like "no way, this is too expensive for 90% of community". Though we would appreciate comments on how to make it cheaper. So, I'm looking for the community advise about pros and cons of different DSPs. Particularly I'm interested in comparing Freescale MSC815x/MSC825x [1][2][3] and TI TMS320C667x [4][5] DSPs/SoCs from the perspective of open-source development. But if you know any other good high-profile DSPs - please propose them too. So far, as I read it we have following comparison: 1) Price. It used to be that Freescale is cheaper, but right now I see that "pricing for the MSC8156 starts at $192 in 10,000 unit quantities" [6], while TMX320C6670CYP is priced 160.00 USD | 1ku [7]. So they're barely the same with TI slightly winning. I'm not sure how much will new MSC8157 cost. 2) Development tools price Both Freescale CodeWarrior and TI Code Composer seem to be at the same line with about $2K per single license (correct me if I'm wrong - I may have missed something easily). Big minus here is that neither Freescale nor TI offer open/free compilers for their DSPs, which is a big roadblock for open-source development. 3) Support for open-source technologies. Well, both Freescale and TI declare themselves as more or less open-source supporters (which is weird while they have expensive development tools). Both offers BSPs for Linux for GPP part of SoCs and free/open OSes for DSP cores (SmartDSP for Freescale, SYS/BIOS for TI). I would appreciate if someone could comment on maturity of those and their usability (bug-ness level). Other then that I don't see any evidence of their support for open-source for their DSPs. 4) Quality/simplicity I have no experience with those DSPs yet, so I would very much appreciate comments about development tools quality / easy to use, code generation quality, DSP architecture simplicity for a programmer and (important!) documentation quality. 5) Chips availability I'm a software guy, so again I seek for an insight about availability of Freescale and TI DSPs. How hard is it to source them? Especially outside of US? 6) Any other concerns? Please share your opinion - I should have missed something important. It's hard to keep everything in mind. PS As I told, we're working on an open-source WiMAX receiver right now. If you're a skilled engineer and you're willing to participate - drop me a few lines with your experience description. We need more skilled hands to get up and running faster. And I should say this project is a *lot* of fun. PPS Please don't mail me if you just want to look into the code out of curiosity or don't have enough skills or enough time to help. We'll announce the project publicly when we have a (somehow) working prototype. Right now we just have a bunch of Matlab proof-of-concept code and we've started to port it to FPGA. Thank you if you get that far! Sorry for the long e-mail :) 1. http://www.freescale.com/webapp/sps/site/homepage.jsp?code=STARCORE_HOME 2. http://www.bdti.com/InsideDSP/2010/12/16/Freescale 3. http://www.bdti.com/InsideDSP/2010/05/20/Freescale 4. http://focus.ti.com/dsp/docs/dspcontent.tsp?contentId=77428&DCMP=nysh_101109&HQS=Other+PR+c66multicore-tcipr-lp 5. http://www.bdti.com/InsideDSP/2010/11/18/Ti 6. http://www.eetimes.com/electronics-products/processors/4108765/Freescale-reboots-base-station-DSPs-leapfrogs-TI 7. http://focus.ti.com/docs/prod/folders/print/tms320c6670.html -- Regards, Alexander Chemeris. http://www.fairwaves.ru _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
