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我有一个相当令人沮丧的问题,我很新的到Python /树莓派pySerial缓冲GPSD坐标上树莓派
我有一个脚本,是相匹配的GPS与过滤iwlist扫描SSID坐标和然后发送电子邮件生成的文件,只要有wifi连接。
我的问题是,结果被连续缓冲,所以GPS坐标可能会远离扫描的SSID。
我在while循环的开始处刷新了串行线,但它似乎不起作用。我也有python运行un-buffered(-u,但这可能只是为了文本文件..)我添加了Output.flush(),但我还没有能够测试它。我想先问一下。
所以,我的问题是,有没有办法关闭串行线缓冲区,所以每次迭代都会在while循环执行时获得GPS坐标?我写的所有文本文件都有file.flush()。这是否需要在写入文件之前进行,否则不会影响串行缓冲区?我错过了什么?
任何帮助,将不胜感激
#!/usr/bin/python -u
import os
import gps
import time
import serial
import smtplib
from email.MIMEMultipart import MIMEMultipart
from email.MIMEBase import MIMEBase
from email.MIMEText import MIMEText
from email import Encoders
username = 'gmail account'
password = 'account password'
port = serial.Serial("/dev/ttyAMA0", baudrate=9600)
#Setting GPS session, listen on port 2947 (gpsd) of localhost
session = gps.gps("localhost", "2947")
session.stream(gps.WATCH_ENABLE | gps.WATCH_NEWSTYLE)
#Begin GPS and WiFi Scan loop..
while True:
try:
port.flushInput()
#port.flushOutput() commented out because I haven't tested with this yet.
time.sleep(.5)
report = session.next()
#Uncomment below for report data
#print report
if report['class'] == 'TPV':
if hasattr(report, 'lat' and 'lon'):
#setting GPS variables and strings
latitude = report.lat
latString = "%f" %(latitude)
longitude = report.lon
lonString = "%f" %(longitude)
#WiFi scan and parse script. I don't think it is necessary to post,
#but if it is, I will. All text files are flushed before being closed
#Email when connected
ping = os.system('sudo ping -c4 8.8.8.8')
try:
if ping == 0:
msg = MIMEMultipart()
msg['Subject'] = "GPS/WiFi data from GPS PILOT"
msg['From'] = username
msg['To'] = username
body = "GPS/WiFi data attached.."
msg.attach(MIMEText(body, 'plain'))
part = MIMEBase('application', "octet-stream")
part.set_payload(open("/home/pi/gpsMaster/dataLog.csv", "rb").read())
Encoders.encode_base64(part)
part.add_header('Content-Disposition', 'attachment; filename="GPSWiFi_Scan.csv"')
msg.attach(part)
server = smtplib.SMTP('smtp.gmail.com:587')
server.ehlo()
server.starttls()
server.login(username, password)
server.sendmail(username, username, msg.as_string())
server.quit()
os.system("sudo rm /home/pi/gpsMaster/dataLog.csv")
else:
pass
except smtplib.SMTPException:
os.system('sudo reboot now')
#Adding loop delay
time.sleep(10)
#Loop ending exceptions
except KeyError:
pass
except IOError:
print ("ERROR")
#os.system('sudo reboot now')
except KeyboardInterrupt:
quit()
except StopIteration:
session = None
os.system("sudo reboot now")
你为什么要刷这个端口,而'/ dev/ttyAMA0'和你的gps一样? – Nodak
@Nodak我正在刷新端口以尝试获取最新的GPS坐标,而不是从缓冲区中取出一个。假设,如果我每英里驾驶5英里的目标SSID,在行程结束时,脚本会在行程开始附近绘制坐标(取决于缓冲区的大小)。/dev/ttyAMA0是GPS所在的端口,通过输入命令'cgps -s',我可以看到当前读数。 – sjo91190
GPSD处理设备。它不共享设备。它共享数据。你只是想从gpsd流中提取数据。 – Nodak