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python - Python写两次但随机？

问题描述

所以我目前正在开发一个从以前的同事那里传给我的程序，我正在解决一个奇怪的错误。当从 2 个单独的串行源逐字节读取数据输出时，python 将写入 .csv 文件以及控制台中的同一单元格。

import serial
from datetime import datetime
import os

pressure_passed = False
arduino_passed = False
file_passed = False

BAUD_RATE = 115200

GARBAGE_CYCLES = 3 # how many cycles to ignore before logging data
garbage_cycle = 0

# Save data to log file
def LogData(startTime, pressureData, arduinoData, file):
    global garbage_cycle
    
    if garbage_cycle < GARBAGE_CYCLES:
        garbage_cycle += 1
    else:
        delta = datetime.now() - startTime
        ms = delta.total_seconds() * 1000
        dataString = "{:0.2f}, {}, {}\n".format(ms, pressureData, arduinoData)
        file.write(dataString)
        file.flush()
        print(dataString, end = "")



# Get the COM port for the Mark-10 Series 5
while not pressure_passed:
    try:
        pressure_com = input("Enter Mark-10 Series 5 COM Port #: ")
        pressure_ser = serial.Serial("COM" + str(pressure_com), BAUD_RATE)
        pressure_passed = True
    except:
        print("Invalid COM Port, please enter a valid port.\n-----")



# Get the COM port for the Arduino 
while not arduino_passed:
    try:
        arduino_com = input("Enter Ardunio COM Port #: ")
        arduino_ser = serial.Serial("COM" + str(arduino_com), BAUD_RATE)
        arduino_passed = True
    except:
        print("Invalid COM Port, please enter a valid port.\n-----")
    
    
    
# Get the name for the log file
while not file_passed:
    try:
        file_name = input("Enter log file name: ")
        
        # Add extension if not already given
        if "." not in file_name:
            file_name += ".csv"
            
        log_file = open(file_name, "a")
        
        # Add header row to log file
        if os.stat(log_file.name).st_size == 0:
            log_file.write("time (ms), pressure, rate (deg/ms)")
            
        file_passed = True
    except:
        print("Invalid file, or could not open the file specified.\n-----")
        
        
start = datetime.now()
        
# Variables to read serial input
pressure_data = ""
last_pressure = ""
arduino_data = ""
last_arduino = ""

# Main program loop
# Serial is read from byte by byte to better sync the two devices
while True:
    try:
        x_changed = False
        y_changed = False
        
        # Read from Mark-10 serial if available
        # x is a byte read from the serial line, converted to ascii
        if pressure_ser.in_waiting > 0:
            x = pressure_ser.read().decode('ascii')
            x_changed = True
                   
        # Read from Arduino serial if available
        # y is a byte read from the serial line, converted to ascii
        if arduino_ser.in_waiting > 0:
            y = arduino_ser.read().decode('ascii')
            y_changed = True
                    
        # If new data received, check if we should log it
        if x_changed:
            if x == '\n': # New line detected, log the accumulated data
                if last_pressure != pressure_data:
                    LogData(start, last_pressure, last_arduino, log_file)    
                    last_pressure = pressure_data
                    pressure_data = ""
            elif x != '\r': # Otherwise, add the read character to the string
                pressure_data += x
                
        if y_changed:
            if y == '\n': # New line detected, log the accumulated data
                if last_arduino != arduino_data:
                    LogData(start, last_pressure, last_arduino, log_file)
                    last_arduino = arduino_data
                    arduino_data = ""
                    
            elif y != '\r': # Otherwise, add the read character to the string
                arduino_data += y
            
    except Exception as e:
        print(e)
        if arduino_ser.isOpen():
            arduino_ser.close()
        if pressure_ser.isOpen():
            pressure_ser.close()
        log_file.close()
        break

这是文件吐出的内容，即双重打印到单个单元格。数据样本

任何建议都非常感谢，谢谢大家！

标签： pythoncsv

解决方案

我喜欢你的用户名！我的猜测是，在 arduino 有时间更改in_waiting.

在代码顶部添加：

import time

并在LogData函数中添加：

time.sleep(0.1)

试一试，如果有帮助，请告诉我。0.1s 对您的应用程序来说可能太长了，但这是一个很好的测试，看看这是否是问题所在。如果是这样，您可以玩弄它的睡眠时间。

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