USB OTG
The ADALM-PLUTO and ADLAM2000 support USB_On-The-Go. This allows a few different use cases for these instruments.
Running applications from USB drives
The Pluto will automount any USB mass storage device such as thumb drive or Hard Drives. The automounter will then look for some special file names:
runme[0-9].shwhich it will run as a shell scriptrunme[0-9]which it will run as a binary file.
For those interested, it will do that via the automounter script in
/lib/mdev/automounter.sh which is maintained
here.
Note 1 : if you’re editing the runme.sh file from windows, make sure you use ‘LF’ as file line ending.
Note 2 : The power supply (and USB cable quality) of the ADALM-PLUTO have an influence on the otg storage device plug detection.
Basic Example
For those who just want to do something, create a runme0.sh file on a thumb
drive (FAT32 is fine) which looks like a normal unix
shell script.
To debug your shell script, try your commands via ssh before putting them in the script.
This example requires at least firmware v0.22.
#!/bin/sh
# the default directory the script runs in is /dev, so change to the drive
cd /media/sda1/
# create a file
touch foobar
# change the RX_LO to 2.4GHz
iio_attr -a -c ad9361-phy RX_LO frequency 2400000000
and insert the USB thumb drive in to Pluto.
The LED should stop blinking, and you have run your application. To safely unmount the drive, you should press the button, which will cause the drive to by sync’ed, file systems caches flushed, and properly unmount the drive.
Advanced examples
Send a tone
The code below sets up a tone, and plays it out via the DDS (the AD9361’s test mode). It then unmounts the drive it is running on, so you can unplug the USB drive. All that is necessary is to boot while the uSB drive is plugged in, and that is it. This example requires at least firmware v0.22.
#!/bin/sh
# the default directory the script runs in is /dev, so change to the drive
cd /media/sda1/
# create a file
touch foobar.txt
echo default-on > /sys/class/leds/led0:green/trigger >> foobar.txt
# Set the LO up
/usr/bin/iio_attr -a -c ad9361-phy TX_LO frequency 908460000 >> foobar.txt
# Set the Sample frequency up, tone will appear at sampling_frequency/32
/usr/bin/iio_attr -a -c -o ad9361-phy voltage0 sampling_frequency 32000000 >> foobar.txt
# Turn the attenuation down
/usr/bin/iio_attr -a -c -o ad9361-phy voltage0 hardwaregain 0
# https://wiki.analog.com/resources/tools-software/linux-drivers/iio-transceiver/ad9361#bist_tone
# Inject 0dBFS tone at Fsample/32 into TX (all channels enabled)
/usr/bin/iio_attr -a -D ad9361-phy bist_tone "1 0 0 0" >> foobar.txt
cd /root
ACTION=remove_all /lib/mdev/automounter.sh