How to execute >sudo sh -c "echo BB-SPIDEV0 > $SLOTS" from bash?

[Ram Kanhirotentavida]

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

[Ram Kanhirotentavida]

Hi,

Please ignore my support request. I could resolve it by keeping the env variable after sudo su. 

Regards,

Ram

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