...so if you enable both spidevs you have four devices show up. On Tue, Nov 11, 2014 at 9:51 AM, Jason Lange <j.b.la...@gmail.com> wrote:
> The two devices that show up are associated with the same clock and data > lines, they just have different chip select lines to allow you to multiplex > two devices -- they cannot be used simultaneously. > > On Mon, Nov 10, 2014 at 3:54 PM, <janszymanski12...@gmail.com> wrote: > >> Hi, >> >> Following the links: http://elinux.org/BeagleBone_Black_Enable_SPIDEV >> and >> http://www.nagavenkat.adurthi.com/2014/02/spi-communication-beaglebone-black-as-master-to-arduino-as-slave/ >> I was able to make it work, but I have a SS too long (1.4ms) for my need. >> For easy test connect MOSI and MISO with a wire (loopback) to eliminate >> connection problem with you SPI slave. >> Hope this will help. When you done, can you measure the timing a let me >> know? >> I can post you my code if you need it. >> >> Jan >> >> >> On Tuesday, November 11, 2014 5:03:38 AM UTC+11, lambert...@gmail.com >> wrote: >>> >>> Hi, >>> >>> I am trying to communicate with a device (ADS1299à by using the >>> Beaglebone black but without success. First I have to enable spi dev >>> entries in /dev. There are plenty of blog/tuto which are giving dtc file to >>> generate our own dtbo. But dtc files seems to not be always the same. >>> >>> In fact I can see that there are already some dtbo files in >>> /lib/firmware : >>> root@beaglebone:~# ls /lib/firmware/ | grep SPI >>> ADAFRUIT-SPI0-00A0.dtbo >>> ADAFRUIT-SPI1-00A0.dtbo >>> BB-SPIDEV0-00A0.dtbo >>> BB-SPIDEV1-00A0.dtbo >>> BB-SPIDEV1A1-00A0.dtbo >>> >>> So I want to use only SPI0 because I know that SPI1 is already used by >>> HDMI. Can I used theses dtbo files ? Is it better to write my own ? It is >>> quite strange, when I enable one of theses dtbo files, I get not only one >>> but two entries in /dev ?? >>> >>> Currently I want to validate my wiring between the two boards. I found a >>> piece of code to read the device id in register of the device though SPI. >>> But when I try to read this register, I can only get 1 or only get 0 >>> (depends of the dtbo files) >>> >>> Any advice of the good way to process here ? >>> >>> Thanks & Regards, >>> Arthur. >>> >>> >>> >>> >>> -- >> 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. >> 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. For more options, visit https://groups.google.com/d/optout.
