82 lines
2.4 KiB
Python
82 lines
2.4 KiB
Python
import serial
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import matplotlib.pyplot as plt
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import numpy as np
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from scipy import signal
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#should be running at 244Hz
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fs = 244
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b, a = signal.butter(
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N = 2,
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Wn = [30],
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btype = 'lowpass',
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fs = fs)
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ser = serial.Serial(port='/dev/ttyACM1', baudrate=115200, timeout = 0.5)
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ser.flush()
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data = bytes()
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ready = False
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ser.write(b'?')
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types = []
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def arr_sizes(s):
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if s[-1:] != b']' or b'[' not in s:
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return 1
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v = int(s[s.rindex(b'[') + 1:-1])
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return v
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for i in range(13):
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line = ser.readline().strip(b'\n').strip(b'\r')
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if line != b'':
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L = line.split(b" ")
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types.append({'type_name' : L[0],
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'type_code' : int(L[1]),
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'size' : int(L[2]),
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'elements' : []
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})
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i = 3
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while i < len(L):
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types[-1]['elements'].append({'type_name' : L[i], 'name' : L[i + 1], 'offset' : int(L[i + 2]), 'n_elements' : arr_sizes(L[i + 1]), 'size' : int(L[i + 3]) * arr_sizes(L[i + 1]), 'readings' : []})
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i += 4
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ser.flush()
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ser.timeout = 5
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ys = []
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for i in range(1000):
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ser.write(b'R')
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data = ser.read(1024)
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index = 0
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while (index < 1024):
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packet_type = (data[index + 1]<<8) + data[index]
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ind = [i for i,t in enumerate(types) if t['type_code'] == packet_type]
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if len(ind) != 1:
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break
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t = types[ind[0]]
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d = data[index + 2 : index + 2 + t['size']]
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for e in t['elements']:
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block = d[e['offset']:e['offset'] + e['size']]
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element_size = int(len(block) / e['n_elements'])
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if t['type_name'] == b'packet_ekg' and e['name'] == b'readings_cnts[50]':
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chunked = [int.from_bytes(block[i:i + element_size - 1], byteorder='little', signed = True) for i in range(0, len(block), element_size)]
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#BB = [block[i:i + element_size] for i in range(0, len(block), element_size)]
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#if t['type_name'] == b'packet_ekg' and e['name'] == b'readings_cnts[50]':
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ys += chunked
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plt.clf()
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dat = np.array(ys[-1000:])
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plt.plot(dat, 'k.', linestyle = '--')#signal.filtfilt(b, a, dat))
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plt.pause(0.01)
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##print(BB)
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e['readings'].append(chunked)
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index += 2 + t['size']
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#for t in types:
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# if t['type_name'] == b'packet_ekg':
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# print(t)
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