R30 is a bit field of GPIO outputs. Try "__R30 ^= 0xffff" to toglle all 16 PRU outputs.
Regards, Dimitar On Friday, April 28, 2017 at 6:56:15 PM UTC+3, M Pitman wrote: > > This is a followup to a past post on the PRU's. I'm looking to provide a > clock pulse in the 100kHz range plus send additional pulses out of the PRU > and receive a couple other pulses back from a sensor. > > > > I've been able to load the device tree overlays for pins P8.11, P8.12, > P8.15, P8.16 and P9.24 with no problems. For output, the overlay sets the > mode for pins P8.11 and P8.12 to 0x06. Plus, I've been able to generate > the clock pulse on P8.11 and the other needed outgoing pulse on P8.12 using > assembly language but I get the general impression that going forward the > preferred method for programming the PRU's is with C. So for testing I've > tried to get PRU_gpioToggle.c to work but for some reason I can't get pins > P8.11 or P8.12 to toggle. Instead, they just read a constant 0 volts. In > the code, gpio is set to 0x000F thinking this should be pin 15, as in > pr1_pru0_pru_r30_15. Not being certain for the format of this number I've > also tried 0x1111 but with the same results. > > > > PRU_gpioToggle compiles OK and the .out file is copied to > /lib/firmware/am335x-pru0-fw The PRU's are stopped and restarted with > rmmod -f pru_rproc and modprobe pru_rproc. dmesg shows they stop and start > as expected. However, still no luck with the toggling. > > > > uname -a reads 4.4.54-ti-r93 #1 SMP. > > > > Does anybody have any idea what I’m doing wrong? > > > > Thanks > > > > Mike Pitman > -- 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 [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/c763b55b-2798-4f41-9ffe-eb2b585ac77f%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
