53 lines
No EOL
1.7 KiB
Python
53 lines
No EOL
1.7 KiB
Python
# contact ST32 microcontroller via serial,
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# gather the single bytes we recieve and put them together (two by two),
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# plot the 16bits numbers.
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import serial
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import sys
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import time
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from serial_helpers import vrefint_conv_plot, temp_conv_plot, generic_plot
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SERIAL_PORT = '/dev/ttyACM0'
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BAUDRATE = 115200
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TIMEOUT = 1
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ACQ_CHAR = 'a' # trigger char for acquiring data configured on the board
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RCV_CHAR = 's' # trigger char for sending data configured on the board
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# init serial port
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try:
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ser = serial.Serial(SERIAL_PORT, BAUDRATE, timeout=TIMEOUT)
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except serial.SerialException as e:
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print(f"Serial port init error: {e}")
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sys.exit(1)
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# send the acquisition char in ascii encoding (single byte)
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ser.write(ACQ_CHAR.encode('ascii'))
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time.sleep(1.5)
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# send the receiving char in ascii encoding (single byte)
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ser.write(RCV_CHAR.encode('ascii'))
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# read the full content being sent
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recieved = bytearray(ser.readall())
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decoded = str(recieved.decode('latin1')).strip()
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# check if i recieve a 'special code' telling me i still have to wait (string 'NA' in my case)
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if decoded == 'NA':
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print('Dati non ancora disponibili!')
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sys.exit(0)
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# join the bytes two by two to get numbers back
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# (note: they were stored with little endianess i think, so set appropriate 'byteorder' value)
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numbers = [int.from_bytes(recieved[i:i+2], byteorder='little', signed=False) for i in range(0,len(recieved),2)]
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trigger_point = numbers[100]
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numbers = numbers[0:100]
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begin = (trigger_point + 70) % 100
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numbers = numbers[begin:100] + numbers[0:begin]
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# put here the relevant convert/plot function from serial_helpers
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#vrefint_conv_plot(numbers) # evaluate Vrefint
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generic_plot(numbers, trigger_point, 10e-6)
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ser.close() |