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pt4_parser.py
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pt4_parser.py
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import sys
import struct
def parse(filename):
with open(filename, 'rb') as input:
header = input.read(212)
capture_data_mask = ord(header[158])
#print hex(capture_data_mask)
_ = input.read(272 - 212)
status = input.read(60)
_ = input.read(1024 - 272 - 60)
data = input.read()
offset = 0
unpacker = struct.Struct('hH')
error_counter = 0
for i in xrange(len(data)/unpacker.size):
current_byte, voltage_byte = unpacker.unpack_from(data, i * unpacker.size)
if current_byte == 0x8001 or voltage_byte == 0xffff:
continue
coarse_measurement = current_byte & 0x01
current_ticks = current_byte & 0xfffe
if coarse_measurement:
current_ma = current_ticks * .250
else:
current_ma = current_ticks * .001
voltage_ticks = voltage_byte & 0xfffc
voltage_v = voltage_ticks * .000125
print '%.4f,%.3f' % (i * .0002, round(current_ma * voltage_v, 3))
if __name__ == "__main__":
parse(sys.argv[1])