raspberry-pi中的RFID读卡器(EM18)程序

2024-03-29 12:54:53 发布

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我在用python用raspberry-pi编写RFID读卡器(EM18)程序。这是代码,我得到一个错误消息。我试过很多次想弄清楚,但都得到了同样的错误。你知道吗

import time
import serial       

data = serial.Serial(port='/dev/ttyS0,baudrate = 9600,timeout=2)
print ("Place the card")


try:
    while True:
    x=data.readline(12)
    print(x)

except KeyboardInterrupt:
    data.close()

Traceback (most recent call last): File "read.py", line 13, in x=data.readline(12) File "/usr/lib/python2.7/dist-packages/serial/serialposix.py", line 490, in read 'device reports readiness to read but returned no data ' serial.serialutil.SerialException: device reports readiness to read but returned no data (device disconnected or multiple access on port?)


Tags: inpyimportreaddatareadlineportdevice