Live Plotting BNC input using Python

[Elf]

Hi, I'm trying to make an updating graph of an analogue input to the Pitaya in python (I'm using matplotlib).
I've taken the sample code to plot from an analogue input, and combined it with some code from a live-plotting tutorial, but the graph still doesn't update with new values, and I'm not sure which part of the code is preventing it from doing so (but I think it's to do with the triggering?)
My code is below, any help is appreciated.

Code: Select all

#------PLOT FAST ANALOGUE SIGNAL FT. MATLAB------
#---importing---
import sys
import time
import redpitaya_scpi as scpi
import matplotlib.pyplot as plt
import matplotlib.animation as animation
from matplotlib import style

#---connecting to Pitaya---
rp_s = scpi.scpi('ip_address_here')
rp_s.tx_txt('ACQ:START')
rp_s.tx_txt('ACQ:TRIG NOW')
#---making a figure---
style.use('fivethirtyeight')
fig = plt.figure()
ax1 = fig.add_subplot(1,1,1)

#---getting the data and updating---
def animate(i):
	plt.ion()
	while 1:
	    rp_s.tx_txt('ACQ:TRIG:STAT?') #get trigger status
	    if rp_s.rx_txt() == 'TD': #TD is disabled
	        break
	rp_s.tx_txt('ACQ:SOUR1:DATA?')
	buff_string = rp_s.rx_txt()
	buff_string = buff_string.strip('{}\n\r').replace("  ", "").split(',')
	buff = map(float, buff_string)
	ax1.clear()
	ax1.plot(buff)

#---Plotting---
ani = animation.FuncAnimation(fig, animate, interval = 1000)
plt.show()

[Nils Roos]

but I think it's to do with the triggering?

You are quite right, the "ACQ:START" and "ACQ:TRIG NOW" belong inside the animate() function before the while loop. The way it is now, you are always reading the same buffered samples over and over.