Python interpreter

[Bulova]

Hello,

I am trying to install Python and MS Visual Code.

Everything worked okay until:

3. Install appropriate extensions for your coding environment (Python Extension Pack and Better Comments are a good combination for VS Code).
4. Setup or create a new XXX. Here are some for Visual Studio Code.
5. Choose a Python interpreter.

Item (4) is not clear for me, the place where the XXX is shown, is empty. And so I don't know how I can get to the window where I can select a python interpreter in item (5). All the menu items don't show how to get there.

Thanks for any help.

Regards

Dieter

[pavel]

I use micromamba to install Python. Here is a link to the instructions that work for me:

http://pavel-demin.github.io/red-pitaya ... ng-started

[Bulova]

I got some more things. The compiler runs so far, without selecting a special interpreter. Maybe it recognizes automatically what is needed. I don't know, I am a beginner -- I programmed a lot in C++ for Arduino and for Microchip PICs as well and even in assembler for older 68HC11 and derivates. Python is rather new for me. But they tell that it is an easy to learn language. So far, so good.

When I ran one of the simple PY programs like 'Blink', I first got errors like

unknown false did you mean False
unknown true did you mean True
unknown null

Okay I changed this, the one with null I changed to None.

The code is:

Code: Select all

#!/usr/bin/env python3
import sys
import time
import redpitaya_scpi as scpi
IP = 'rp-f066c8.local'
rp_s = scpi.scpi(IP)
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))
rp_s.close()

But there is still an error, which I cannot solve.

rp_s = scpi.scpi(IP)
^^^^^^^^^
AttributeError: module 'redpitaya_scpi' has no attribute 'scpi'

It seems that there is something missing in the library.

Maybe somebody can help with a hint.
Thank you

Dieter

[Bulova]

Next step:
I found (my) first mistake: The redpitaya_scpi.py was a wrong file. Then I copied a seemingly file. Now I think I have the right one. At least there is a different error after starting to run the BLINK program:

ModuleNotFoundError: No module named 'numpy'

In the Red Pitaya library there is an import of the module, which seems to be missing.

Code: Select all

"""SCPI access to Red Pitaya."""

import socket
import struct
import numpy as np

Okay, I will have a look how to install this module numpy (which should have been done during the Python-installation -- seemingly).

Maybe somebody knows something about that.

Best regards

Dieter

[redpitaya]

Hello Dieter,

Weirdly, the links for workspace and tutorials do not display for you in the Python instructions... They display just fine on my setup

The line says: "Setup or create a new workspace. Here are some tutorials for Visual Studio Code."
The links are: - https://code.visualstudio.com/docs/editor/workspaces
- https://code.visualstudio.com/docs/gets ... ntrovideos

[redpitaya]

I got some more things. The compiler runs so far, without selecting a special interpreter. Maybe it recognizes automatically what is needed. I don't know, I am a beginner -- I programmed a lot in C++ for Arduino and for Microchip PICs as well and even in assembler for older 68HC11 and derivates. Python is rather new for me. But they tell that it is an easy to learn language. So far, so good.

When I ran one of the simple PY programs like 'Blink', I first got errors like

unknown false did you mean False
unknown true did you mean True
unknown null

Okay I changed this, the one with null I changed to None.

The code is:

Code: Select all

#!/usr/bin/env python3
import sys
import time
import redpitaya_scpi as scpi
IP = 'rp-f066c8.local'
rp_s = scpi.scpi(IP)
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))
rp_s.close()

But there is still an error, which I cannot solve.

rp_s = scpi.scpi(IP)
^^^^^^^^^
AttributeError: module 'redpitaya_scpi' has no attribute 'scpi'

It seems that there is something missing in the library.

Maybe somebody can help with a hint.
Thank you

Dieter

Yes, I will fix and test the examples.

For the second error, you have to download the Red Pitaya SCPI library, which you can get from here: https://github.com/RedPitaya/RedPitaya/ ... ya_scpi.py and include it as

Code: Select all

import redpitaya_scpi as scpi

That should fix the issue. The library should be in the same folder as your Python code (same documentation level)

Please also change the IP local address to the one that matches your own board

[Bulova]

Hello RP,

the reason why some PDFs are not displaying the whole content is probably coming from different readers. I am mostly using Acrobat reader, not Chrome or somehting else.

I can report some success. The simple Python program BLINK.PY now runs perfectly. To solve my last problems, I have done the following steps (just in case, that somebody stumbles over the similar problems like me):

1) The missing module 'numpy' has to be installed first: Simply start Terminal (Windows Powershell) and type

Code: Select all

pip install numpy

Then the installation should work okay.

2) After starting the Python program there is still a message, that the device cannot be connected. To solve this, run the RP's selection space for apps and select

'Development'
SCPI server
RUN

It will be confirmed by a green text.

Then normally you can start the Python file by pressing RUN under Windows Visual Studio Code.

I hope this helps other people too.

Best regards

Dieter

[redpitaya]

Hello Dieter,

Thank you for the feedback.

One question, are you viewing the documentation online, or have you downloaded it as a PDF and view it like that? I will check the rendering of the PDF documentation and make sure to fix the bugs.

I assumed the instructions on starting the SCPI and installing Python libraries were clear enough, I will update then with the next patch of documentation.

[Bulova]

Hello RP,

for me it looks like the downloaded PDF suppresses some URL links. Internal links are okay, but on page 161 of 2.00-30 from Mar 22 2024 under 4) it says:

4) Setup or create a new ____

Online it comes through that it is meant "Workspace", and behind that it is a URL link to Visual Studio site. It can be that my windows setup suppresses links somewhere else, I am not sure.

Best regards

[Bulova]

Hello RP,

as I said, most likely the PDF setup causes this problem. I used now the EPUB download instead and opened it with Adobe Digital Edition, and this does not suppress the links. Thank you for taking care.

Best regards

Dieter