start penna zip

generic_serial.py

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+# contact ST32 microcontroller via serial,
+# gather the single bytes we recieve and put them together (two by two),
+# plot the 16bits numbers.
+
+import serial
+import sys
+import time
+
+from serial_helpers import vrefint_conv_plot, temp_conv_plot, generic_plot
+
+SERIAL_PORT = '/dev/ttyACM0'
+BAUDRATE = 115200
+TIMEOUT = 1
+
+ACQ_CHAR = 'a'  # trigger char for acquiring data configured on the board
+RCV_CHAR = 's'  # trigger char for sending data configured on the board
+
+# init serial port
+try:
+    ser = serial.Serial(SERIAL_PORT, BAUDRATE, timeout=TIMEOUT)
+except serial.SerialException as e:
+    print(f"Serial port init error: {e}")
+    sys.exit(1)
+
+# send the acquisition char in ascii encoding (single byte)
+ser.write(ACQ_CHAR.encode('ascii'))
+time.sleep(1.5)
+# send the receiving char in ascii encoding (single byte)
+ser.write(RCV_CHAR.encode('ascii'))
+
+# read the full content being sent
+recieved = bytearray(ser.readall())
+
+decoded = str(recieved.decode('latin1')).strip()
+
+# check if i recieve a 'special code' telling me i still have to wait (string 'NA' in my case)
+if decoded == 'NA':
+    print('Dati non ancora disponibili!')
+    sys.exit(0)
+
+# join the bytes two by two to get numbers back
+# (note: they were stored with little endianess i think, so set appropriate 'byteorder' value)
+numbers = [int.from_bytes(recieved[i:i+2], byteorder='little', signed=False) for i in range(0,len(recieved),2)]
+
+trigger_point = numbers[100]
+numbers = numbers[0:100]
+begin = (trigger_point + 70) % 100
+numbers = numbers[begin:100] + numbers[0:begin]
+
+# put here the relevant convert/plot function from serial_helpers
+#vrefint_conv_plot(numbers)  # evaluate Vrefint
+generic_plot(numbers, trigger_point, 10e-6)
+ser.close()