Real-Time Measurement and Control
Running python in parallell with LabVIEW RT
I do not really understand your question. If you are asking if you can send data from a LabVIEW application to a python code, then yes. If you are asking if you can program a cRIO using python, the answer is no. I am currently doing a very similar application where I have programmed a cRIO to acquire data (the data is being sent through DMA FIFO from the FPGA). I am sending the data from the RT side to raspberry pi, programmed with python. I haven't had any problems. Here is my RT application and python code for reference. Be advised I removed a lot of the labview block diagram code to show the essence of sending data to a port via TCP/IP connections. In the middle of the flat sequence structure I have two loops.
In loop 1:
I am getting the data from the FIFO and enqueueing the data
In loop 2:
I am dequeuing the data and writing it to TCP write
Here is python code:
import socket
from matplotlib import pyplot as plt
from struct import unpack
HOST= '192.168.X.XX'
PORT = 6340
# Create socket and pull data
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
# set rx buffer size
recv_buf_size = 4096
s.setsockopt(socket.SOL_SOCKET, socket.SO_RCVBUF, recv_buf_size)
s.connect((HOST, PORT))
print(f"Connected to {HOST}:{PORT}")
# Receive the length of the payload
len_bytes = s.recv(4)
length = int.from_bytes(len_bytes, byteorder='big')
print(f"Length: {length}")
if length > 1000000:
print("clipping")
length = 1000000
# Pull the actual data
got = 0
buf = bytearray(length)
view = memoryview(buf)
while got < length:
nread = s.recv_into(view[got:], length - got)
if nread == 0:
raise ConnectionError("closed")
got += nread
print(got)
print(f"RX length: {len(buf)}")
format_str = ">" + "h"*(length//2)
decoded = unpack(format_str, buf)
#print(f"Data: {decoded}")
# Send Close request
plt.figure()
plt.plot(decoded[0::2], label="CH1")
plt.plot(decoded[1::2], label="CH2")
plt.legend()
plt.show()
Furthermore:
- Hardware connection are to be considered. In my case my laptop is connected to a my cRIO via USC-C and regular USB. I use this connection to program the cRIO.
- I then have a Ethernet cable connected from the cRIO to the raspberry pi, this connection is where the HOST= '192.168.X.XX' IP address comes from where the IP address is the IP address of the cRIO through the ethernet port. USE NI MAX to check those IP address
If you have more questions, please ask. If this was all you needed please leave a kudo and 'Accept as Solution'!
