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.
