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import serial
import struct
import sys
import json
from serial.tools.list_ports import comports
header = bytes([0x0A, 0xFA])
footer = bytes([0x00, 0x0b])
if __name__ == '__main__':
if len(sys.argv) > 1:
port = sys.argv[1]
else:
ports = [p.device for p in comports()]
if len(ports) > 1:
print((
"Multiple serial devices %s. Pass the "
"desired one as a command line argument") % (', '.join(ports),
), file=sys.stderr
)
sys.exit(1)
if len(ports) == 0:
print("No serial device connected", file=sys.stderr)
sys.exit(1)
port = ports[0]
data = serial.Serial(port)
def read_literal(string):
i = 0
while i < len(string):
c = data.read(1)[0]
if string[i] == c:
i += 1
elif string[0] == c:
i = 1
else:
i = 0
while True:
read_literal(header)
data_len, = struct.unpack("<H", data.read(2))
marker = data.read(1)[0]
assert marker == 2, marker
packet = data.read(data_len)
if data_len != 20:
print(
"Unexpected packet! %d bytes %r" % (data_len, packet),
file=sys.stderr)
else:
parsed = struct.unpack(
"<HHIIHBBBBBB",
packet
)
fields = [
"ecg", "resp", "sp02_ir", "sp02_red", "temp",
"global_respiration", "global_spo2", "global_heartrate",
"bp_value_sys", "bp_value_dia",
"leadstatus"
]
assert len(fields) == len(parsed)
print(json.dumps(dict(zip(fields, parsed))))
next2 = data.read(2)
if next2 != footer:
print("Uh oh. Was expecting footer but got", next2, file=sys.stderr)
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