Python - 可用时从串口数据逐行读取到列表中
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Python - read from the serial port data line by line into a list when available
提问by Ahmed Al-haddad
I am aiming to write a code that will be indefinitely listening and reading from to a serial port that will have this output produced every few seconds
我的目标是编写一个代码，该代码将无限期地侦听和读取串行端口，该串行端口将每隔几秒钟产生一次输出
serial port output:
串口输出：
aaaa::abcd:0:0:0
//printf("%d\n",data[0]);
2387
//printf("%d\n",data[1]);
14
-9
244
-44
108
I want the data to be appended in a list like this, python supposed output
我希望将数据附加到这样的列表中，python 假设输出
[abcd::abcd:0:0:0, 2387, 14, -9, 244, -44, 108]
I tried this code amongst many others but nothing worked, I keep on getting no output EDIT- the code below gives me this output
我在许多其他代码中尝试过这段代码，但没有任何效果，我一直没有输出 编辑 - 下面的代码给了我这个输出
'''[['abcd::', 'abcd::', 'abcd::', 'abcd::', 'abcd::']] #or
[['abcd::abcd:0:0:c9\n', '2406\n', '14\n', '-7\n']] # and so on, different output for each iteration'''
#[['aaaa::c30c:0:0:c9\n', '2462\n', '11\n', '-9\n', '242\n', '-45\n', '106\n']] apparently it worked only once.
ser = serial.Serial('/dev/ttyUSB1',115200, timeout=10)
print ser.name
while True:
data = []
data.append(ser.readlines())
print data
# further processing
# send the data somewhere else etc
print data
ser.close()
回答by Mitchell Chu
readlinewill keep reading data until read a terminator(new line). please try: read.
readline将继续读取数据，直到读取终止符（新行）。请尝试：read。
UPDATED:
更新：
use picocom -b 115200 /dev/ttyUSB0or putty(serial model) to detect the port and baud-rate is right. I got two different ports in your two questions.if open error port, read()will keep waiting until read a byte. like this:
使用picocom -b 115200 /dev/ttyUSB0或腻子（串行模型）来检测端口和波特率是否正确。我在你的两个问题中有两个不同的端口。如果打开错误端口，read()将一直等到读取一个字节。像这样：
import serial
# windows 7
ser = serial.Serial()
ser.port = 'COM1'
ser.open()
ser.read() # COM1 has no data, read keep waiting until read one byte.
if you type this code in console, console will no output like this:
如果您在控制台中键入此代码，控制台将不会输出如下：
>>> import serial >>> ser = serial.Serial() >>> ser.port = 'COM1' >>> ser.open() >>> ser.read() _
>>> import serial >>> ser = serial.Serial() >>> ser.port = 'COM1' >>> ser.open() >>> ser.read() _
we need add timeout for read to fix it.
you can try this:
我们需要为读取添加超时来修复它。
你可以试试这个：
import serial
import time
z1baudrate = 115200
z1port = '/dev/ttyUSB0' # set the correct port before run it
z1serial = serial.Serial(port=z1port, baudrate=z1baudrate)
z1serial.timeout = 2 # set read timeout
# print z1serial # debug serial.
print z1serial.is_open # True for opened
if z1serial.is_open:
while True:
size = z1serial.inWaiting()
if size:
data = z1serial.read(size)
print data
else:
print 'no data'
time.sleep(1)
else:
print 'z1serial not open'
# z1serial.close() # close z1serial if z1serial is open.
