Run Python scripts from Remote host and on Red Pitaya.

[KKE]

I just spend about 4 hours to write a "smart" post about the topic above. Only to find the forum software neglects to save a draft after it asked me to relogon.
I'm not inclined to write it again.
My questions:

• How do write a python script and run it on a remote host?
  How do I write and run a python script on the RedPitaya hardware?

If your reply contains a link to any of these webpages, don't bother, I've tried them. They are either incomplete or wrong!
http://redpitaya.com/examples-new/blink/
http://clade.pierre.free.fr/python-on-r ... vbuild.zip
https://pypi.python.org/pypi/PyRedPitaya/1.0
http://redpitaya.com/control/?with=matlab

Thanks,

KKE

[KKE]

Nevermind, I solved my problem.

I know this is bad netiquette. But i figure that when one pays €244,00 for a piece of hardware at least the documentation should be up to date.

To get the example running you need to place the module https://raw.githubusercontent.com/RedPi ... ya_scpi.py in the same folder the blink.py example is in. Also don't forget to start the scpi server:

Code: Select all

redpitaya> systemctl start redpitaya_scpi &

Where it says edit the source and enter your RedPitaya's IP address ...

Code: Select all

#!/usr/bin/python

import sys
import time
import redpitaya_scpi as scpi

rp_s = scpi.scpi(sys.argv[1])

if (len(sys.argv) > 2):
  led = int(sys.argv[2])
else:
  led = 0

print ("Blinking LED["+str(led)+"]")

period = 1 # seconds

while 1:
    time.sleep(period/2.0)
    rp_s.tx_txt('DIG:PIN LED' + str(led) + ',' + str(1))
    time.sleep(period/2.0)
    rp_s.tx_txt('DIG:PIN LED' + str(led) + ',' + str(0))

This script should be called from the commandline using:

Code: Select all

./blink.py <IP-address>

Or one could edit the file and replace sys.argv[1] in the scpi.scpi() call with '<IP-address>'

Running scripts directly from RedPitaya is the next step.

[jeanminet]

Hi, you can the script on the RedPitaya the same way using localhost ( ip-address = '127.0.0.1').

[VincKem]

Thanks a lot guys !!! This is exactly what I was looking for
Is there a way to update the http://redpitaya.com/control/ explanation ?
Vincent

[luigiraffaele124]

Dear kke
I'm novice in RP.
I'm not understand a step in your explanation.

I start scpi server on redpitaya by means of putty connection and the command redpitaya> systemctl start redpitaya_scpi &
I'm windows 10, so, I copy the blink.py code and save it as blink.py on my w10 desktop.
I copy the redpitaya_scpi.py and save it as redpitaya_scpi.py on my w10 desktop.

And now?
You say "This script should be called from the commandline using: ./blink.py <IP-address>
I intend the IP-address is that of redpitaya card.
But, what are you intending as commnadline: cmd in window 10, cmd in redpitaya accessible by putty (in which directory?), others?

[Nils Roos]

the IP-address is that of redpitaya card.

Correct.

But, what are you intending as commnadline: cmd in window 10, cmd in redpitaya accessible by putty (in which directory?), others?

The missing step is that you need to have a python interpreter installed on your computer for this. When you execute a .py file from a linux console, the shell will try to run it by calling python. On Windows, if you have the .py extension associated with the python interpreter, double-clicking the .py file should achieve the same effect.

[luigiraffaele124]

I have installed a phyton interpreter and I have launched the blink file, but I have an error. View attachment

[luigiraffaele124]

This is my scpi file, as modified with my RP IP adress and Port.
Also if I write the port number without the single quote, the situation and the error don't change

[Nils Roos]

My knowledge of python is very slim, so I can't really tell you why there's a syntax error. It may have to do with the version.

What I can tell you is that the scpi-server listens on port 5000 by default (unless you tell it otherwise on the command line), so you should keep the 5000.

[luigiraffaele124]

It's just a matter of Python version.
With Python 2.7, the script works fine.
With Python 3.5, there is a incompatibility.
As example, the row:

print 'SCPI >> connect({:s}:{:d}) failed: {:s}' .format (host, port, e)

works fine in 2.7, but in 3.5 it should be transformed in

print ('SCPI >> connect({%s}:{%d}) failed: {%s}'% (host, port, e))

But there is others incompatibility.
As example, in 3.5 there is a problem when digital_led_blink.py is calling a "tx_txt" Method of the "scpi" Class.
Anyway, now I'm using 2.7, so there aren't problems.