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69 lines (58 loc) · 2.54 KB
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"""
Basic usage of PPK2 Python API.
The basic ampere mode sequence is:
1. read modifiers
2. set ampere mode
3. read stream of data
"""
import time
from ppk2_api.ppk2_api import PPK2_API
ppk2s_connected = PPK2_API.list_devices()
if(len(ppk2s_connected) == 1):
ppk2_port = ppk2s_connected[0]
print(f'Found PPK2 at {ppk2_port}')
else:
print(f'Too many connected PPK2\'s: {ppk2s_connected}')
exit()
ppk2_test = PPK2_API(ppk2_port, timeout=1, write_timeout=1, exclusive=True)
ppk2_test.get_modifiers()
ppk2_test.set_source_voltage(3300)
ppk2_test.use_source_meter() # set source meter mode
ppk2_test.toggle_DUT_power("ON") # enable DUT power
ppk2_test.start_measuring() # start measuring
# measurements are a constant stream of bytes
# the number of measurements in one sampling period depends on the wait between serial reads
# it appears the maximum number of bytes received is 1024
# the sampling rate of the PPK2 is 100 samples per millisecond
for i in range(0, 1000):
read_data = ppk2_test.get_data()
if read_data != b'':
samples, raw_digital = ppk2_test.get_samples(read_data)
print(f"Average of {len(samples)} samples is: {sum(samples)/len(samples)}uA")
# Raw digital contains the raw digital data from the PPK2
# The number of raw samples is equal to the number of samples in the samples list
# We have to process the raw digital data to get the actual digital data
digital_channels = ppk2_test.digital_channels(raw_digital)
for ch in digital_channels:
# Print last 10 values of each channel
print(ch[-10:])
print()
time.sleep(0.01)
ppk2_test.toggle_DUT_power("OFF") # disable DUT power
ppk2_test.use_ampere_meter() # set ampere meter mode
ppk2_test.start_measuring()
for i in range(0, 1000):
read_data = ppk2_test.get_data()
if read_data != b'':
samples, raw_digital = ppk2_test.get_samples(read_data)
print(f"Average of {len(samples)} samples is: {sum(samples)/len(samples)}uA")
# Raw digital contains the raw digital data from the PPK2
# The number of raw samples is equal to the number of samples in the samples list
# We have to process the raw digital data to get the actual digital data
digital_channels = ppk2_test.digital_channels(raw_digital)
for ch in digital_channels:
# Print last 10 values of each channel
print(ch[-10:])
print()
time.sleep(0.01) # lower time between sampling -> less samples read in one sampling period
ppk2_test.stop_measuring()