创建NFC读卡python脚本

Posted 2020-12-21 inspirationplace

读卡器：ACR122U，主机环境：ubuntu 20.00

1.apt install libnfc-bin
2.apt install libpcsclite1
3.apt install vim
4.vi /etc/modprobe.d/blacklist-libnfc.conf
在文件尾增加：
blacklist pn533
blacklist pn533_usb
blacklist nfc
5.获取nfc-tools 1.8.0（因为ACR122U在1.7.1上有bug）
github：https://github.com/nfc-tools/libnfc/releases/tag/libnfc-1.8.0
download：https://github.com/nfc-tools/libnfc/releases/download/libnfc-1.8.0/libnfc-1.8.0.tar.bz2
unzip and compile：
tar xjf libnfc-1.8.0.tar.bz2
cd libnfc-1.8.0
./configure --with-drivers=acr122s,acr122_pcsc,acr122_usb --sysconfdir=/etc --prefix=/usr
make
makeinstall
6.try it：nfc-list
7.编写一段python代码，获取UID：
`import time
import os

def execCmd(cmd):
ret = os.popen(cmd)
msg = ret.read()
ret.close()
return msg

def saveCardUIDtoFile(str:str):
file = open(file = "/UID/cardUID",mode = "w")
file.write(str)
file.close()

cmd = "nfc-list"
alreadyDetected = False
findCount = 0
while(True):
ret = execCmd(cmd)
ret = ret.split(" ")
findCount = 0
for element in ret:
if element.find("UID") != -1:
findCount += 1
if alreadyDetected == False:
alreadyDetected = True
print("NFC tag is detected.")
UIDList = element.split(" ")
UID = UIDList[9] + UIDList[11] + UIDList[13] + UIDList[15]
saveCardUIDtoFile(UID)
print("UID is: %r" % UID)
if findCount == 0:
if alreadyDetected == True:
alreadyDetected = False
print("NFC tag is removed.")
saveCardUIDtoFile("")
`
8.enjoy