Hi John, i try to drive the BBB McSPI with using the Pru. Maybe you can help me to find your tip:"If you look on Github, the Starterware examples have been ported to the PRU". Lot of thanks
Regards Peter Am Dienstag, 5. Januar 2016 21:32:51 UTC+1 schrieb john3909: > > OK, you have several options on how to implement this. First, look in > drivers/iio or drivers/staging/iio for example drivers that use SPI. If you > use the RT kernel, you will see latency of less than 1mS, but if this isn’t > good enough, then I recommend using the PRU to program the McSPI. For > examples of how to program the McSPI natively, look at Starterware for > example code. If you look on Github, the Starterware examples have been > ported to the PRU. > > Regards, > John > > > > > On Jan 5, 2016, at 4:57 AM, Chengcong BAO <bchen...@gmail.com > <javascript:>> wrote: > > Hello, > Thanks for replying firstly. > Actully, i am using beaglebone black with debian to developpe a system, > which needs at least 72 I/Os (36 outputs, and 36 inputs for interruptions). > So i use SPI and I/O expanders to controls the 36 outputs so that i have > enough GPIOs for Inputs. I am writing an kernel module for the 36 interrupt > inputs. > Now, my SPI is working in User-Space by using /dev/spidev1.0, but i want > to integrate the SPI inside my kernel module as well. I wonder if it is > possible? > Because i want to measure the time between output and input (input signal > is from a sensor). Since SPI is in user-space, so the output is not always > sent in time, sometimes it has 4 or 5 ms delay, which it's a big deal to > me. > > Thanks, > > Regards, > Cheng > > 2016-01-04 19:20 GMT+01:00 John Syne <john...@gmail.com <javascript:>>: > >> It would be helpful if you explained what it is you are trying to do and >> then we will provide suggestions on how to proceed. >> >> Regards, >> John >> >> >> >> >> On Jan 4, 2016, at 1:34 AM, bchen...@gmail.com <javascript:> wrote: >> >> Hello, >> I saw your publish question about using SPI in a kernel module. I kind of >> stucking in this problem as well. >> So i wonder if you find a solution? >> >> I know it's too late to ask, but i hope i'm lucky to get some feedback >> from you. >> >> Regards, >> Cheng >> >> Le lundi 28 juillet 2014 16:00:59 UTC+2, Nils a écrit : >>> >>> Hello, >>> >>> I'm currently working on a kernel module which needs to communicate via >>> SPI to an external microchip. >>> >>> I used the cape manager to enable SPI. The device is accessible through >>> /dev/spidev1.0. >>> But since it's a kernel module, I guess it's not recommended to access >>> files via sys_open()? >>> >>> Another approach I found would be adding a struct to >>> *arch/arm/mach-omap2/board-am335xevm.c >>> *and then use *spi_register_driver()* in my kernel module. But in my >>> kernel sources (3.8.13) this file doesn't exist. >>> >>> What would be the right way to use SPI in my kernel module? >>> >>> Regards, >>> Nils >>> >> >> -- >> 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...@googlegroups.com <javascript:>. >> For more options, visit https://groups.google.com/d/optout. >> >> >> >> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to a topic in the >> Google Groups "BeagleBoard" group. >> To unsubscribe from this topic, visit >> https://groups.google.com/d/topic/beagleboard/k4LIScayF9M/unsubscribe. >> To unsubscribe from this group and all its topics, send an email to >> beagleboard...@googlegroups.com <javascript:>. >> For more options, visit https://groups.google.com/d/optout. >> > > > -- > 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...@googlegroups.com <javascript:>. > For more options, visit https://groups.google.com/d/optout. > > > -- 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/dd56b1a5-b007-4e81-b812-389d268f6d85%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
