"""
test.py - Simple demonstration of sampling rate using the PRU library for the ADC
Takes 10k samples at 10kHz, returned in a numpy array, and displays the time taken. Repeats 10 times
"""
import time as time
import numpy as np
import ADC_PRU as ADC
N = 10
num_vals = 10000
ADC.set_clk(160) # Optional, 160 is default (10kHz), 16=100 kHz
np_vals = np.empty(num_vals, dtype=np.intc)
for i in range(0, N):
t1 = time.time()
ADC.read(np_vals)
t2 = time.time()
print(t2 - t1)
import ADC_PRU as ADC
import numpy as np
import matplotlib.pyplot as plt
clk='10k'
#Set clock properly and set up array for 1s of data
nsamples=0
if clk=='10k':
ADC.set_clk(160) #Optional, default
nsamples=10000
elif clk=='100k':
ADC.set_clk(16)
nsamples=100000
else:
print 'Unknown frequency'
exit()
vals = np.empty(nsamples,np.intc)
raw_input("Press Enter:")
ADC.read(vals)
#Plot and save
fig=plt.figure()
t=np.arange(0,1,1.0/nsamples)
plt.plot(t,vals*1.8/4095)
plt.ylabel('Voltage (V)')
plt.xlabel('Time (s)')
plt.title(clk)
fig.savefig("out.png")