Python 读取串口数据,动态绘图的示例

#-*- coding: utf-8 -*- # 串口测试程序import serialimport matplotlib.pyplot as pltimport numpy as npimport timeimport re  # User input comport and bundratecomport = input('Please input comport (like COM3) for your connected device: ')baudrate = input('Please input baudrate (like 9600) for your connected device: ')bytes = input('Please input bytes type of uart data (1->1 byte, 2->2 bytes): ')bytes = int(bytes)print('You selected %s, baudrate %d, %d byte.' % (comport, int(baudrate), bytes)) serialport = serial.Serial(comport, int(baudrate), timeout=1, parity=serial.PARITY_EVEN, rtscts=1)if serialport.isOpen():	print("open success")else:	print("open failed") plt.grid(True) # 添加网格plt.ion()	# interactive modeplt.figure(1)plt.xlabel('times')plt.ylabel('data')plt.title('Diagram of UART data by Python')t = [0]m = [0]i = 0intdata = 0data = ''count = 0 while True:	if i > 300:  # 300次数据后，清除画布，重新开始，避免数据量过大导致卡顿。		t = [0]		m = [0]		i = 0		plt.cla()	count = serialport.inWaiting()	if count > 0 :		if (bytes == 1):			data = serialport.read(1)		elif (bytes == 2):			data = serialport.read(2)		if data !='':			intdata = int.from_bytes(data, byteorder='big', signed = False)			print('%d byte data %d' % (bytes, intdata))			i = i+1			t.append(i)			m.append(intdata)			plt.plot(t, m, '-r')   			# plt.scatter(i, intdata)			plt.draw() 	plt.pause(0.002)