Hi, Please ignore my support request. I could resolve it by keeping the env variable after sudo su.
Regards, Ram On Sat, Aug 10, 2019 at 1:30 AM Ram Kanhirotentavida <[email protected]> wrote: > Hi, > > I am setting up SPI0 for read and write from an ADC. To start I tried the > loopback spidev_test found in chp08. This test is not working. When > debugged found that the device overlay step is not running as expected. > > Details: > .profile is set to run in bash shell with exporting SLOTS variable. > > export SLOTS=/sys/devices/platform/bone_capemgr/slots > > root@beaglebone:/lib/firmware# source ~/.profile > root@beaglebone:/lib/firmware# sudo cat $SLOTS > 0: PF---- -1 > 1: PF---- -1 > 2: PF---- -1 > 3: PF---- -1 > 4: P-O-L- 0 Override Board Name,00A0,Override Manuf,cape-universaln > root@beaglebone:/lib/firmware# > > Above shows the BB-SPIDEV0 is missing hence run the below step. It > generates sh: echo: I/O error > >sudo sh -c "echo BB-SPIDEV0 > $SLOTS" > > How can I set the SPIDEV0 overlay to use SPI0? > > SPI loopback result shows 0's. Suppose to match the TX buffer. > > root@beaglebone:~/exploringBB/chp08/spi/spidev_test# ./spidev_test > spi mode: 0 > bits per word: 8 > max speed: 500000 Hz (500 KHz) > Debug message: Return value = 38 > > 00 00 00 00 00 00 > 00 00 00 00 00 00 > 00 00 00 00 00 00 > 00 00 00 00 00 00 > 00 00 00 00 00 00 > 00 00 00 00 00 00 > 00 00 > > OS Details: > >uname -a > Linux beaglebone 4.1.15-ti-rt-r43 #1 SMP PREEMPT RT Thu Jan 21 20:13:58 > UTC 2016 armv7l GNU/Linux > > >cat /etc/dogtag > BeagleBoard.org Debian Image 2016-01-24 > > >cat /etc/debian_version > 8.3 > > > Appreciate if you can help to resolve the issue. > > Thanks, > Ram > > -- > 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/c1b19a5f-8ec5-44a9-8dbe-bc0e71f07d96%40googlegroups.com > <https://groups.google.com/d/msgid/beagleboard/c1b19a5f-8ec5-44a9-8dbe-bc0e71f07d96%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- 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/CAA20zZq9xhFWiToJ8ZAbwgRphBXhssutOa5JYi4YBfVLNzc3vQ%40mail.gmail.com.
