Hi Mike, As Greg said, PRU development is severely hampered by incomplete, out-dated, and mutually-exclusive sets of instructions. Derek Molloy's book may be based on an older Beaglebone Black, but at least it's self-contained and consistent. I struggled for a long time to get the PRU working on a "modern" (4.4?) kernel. Eventually I gave up and installed the 3.8.13-bone80 kernel, which runs all Derek's examples fine. That is the direction I suggest for you.
I never would've gotten my PRU setup working without Derek's book -- I'd still be recompiling kernels and randomly applying patches according to contradictory Internet documentation. BTW, your seg faults may be caused by not loading the PRU device-tree overlay. Derek provides a device-tree overlay and instructions for compiling it on page 510. The actual .dts file is on GitHub here: https://github.com/derekmolloy/exploringBB/tree/master/chp13/overlay Good luck, Justin On Tuesday, February 28, 2017 at 8:01:44 AM UTC-8, Greg wrote: > > Hi Mike- >> >> > There are several possible paths. Since you mentioned Derek Molloy's > book, here is my project which was inspired by his chapter on the PRU: > > https://www.hackster.io/Greg-R/beaglebone-pru-adc-a42a71 > > If you look at this, you will see that I used the RemoteProc framework. > This framework is relatively new and experimental. I have found that TI > is supporting this quite well and for the most part it worked well in the > limited project space I have worked in at this time. > > There is also the UIO based framework which is more mature and has many > successful projects developed with it. > > With regards to getting up and running, you need to be aware of some > set-up you will have to do whatever route you chose. > Here is another project I have published which includes documentation to > guide you through the set-up of RemoteProc framework. > There are some details which I think would also be useful if you go the > UIO route: > > > https://www.hackster.io/Greg-R/pru-pid-motor-speed-controller-with-beaglebone-green-ccb805 > > I am still working on the above project to re-implement the web interface > using a Node based server. Or maybe Python. Not sure yet. > > In general if you Google search on the PRU, you are going to find many > paths which lead you down a dead end. > There is a huge amount of obsolete data information out there. Even a lot > of the TI stuff which is outdated was still out there the last time I > looked. > For example, there are a lot of projects based on the PASM compiler. This > is the original compiler for the PRU. That old compiler is good and used > by many successful project, but it is no longer supported by TI. The new > C compiler (which also compiles assembly) is supported, and though similar > to the instruction set of PASM, there are some differences. So that is > another decision node. > > So that's what I know, good luck with your project! > > Regards, > Greg > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/261e8b4f-928e-4b33-bf37-47fd5385b423%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
