用RC522读取标签UID，用RPi2读取USB串口

Question

我有一个RPi2 (Python2.7)和两个射频识别阅读器。一个阅读器是一个USB串行十六进制MF7 (连接到一个串行端口)和另一个是RFID- an 522(连接到GPIO引脚)。RC522按照在pimylifeup.com up.com/raspberry-pi-rfid-pi 522上找到的指令正确连接。两个读取器都工作和读取标记，但是它们的输出字符串对于相同的标记是不同的。

我知道数据结构(串行ASCII)和波特率: 9600，N,8,1，从Gigatek - 链接读取.我的脚本从串口读取12个字符字符串，并从其中提取UID reply_rfid_1[1:9]：

#!/usr/bin/env python2
# -*- coding: utf-8 -*-

"""
Convenient python function to read RFID tags with GIGATEK MF7
    """

############################

#from collections import defaultdict
#import csv
import sys
import serial
import time
from datetime import datetime



# define variables
global value_rfid, reply_rfid, refTime



# assign values
refTime = datetime.now()



# open the serial port /dev/ttyUSB1 and check if the port is really open
rfid_port_1 = serial.Serial("/dev/ttyUSB1", 9600)    # omit if not in use
print 'rfid_read.py -> rfid reader on port', rfid_port_1.name
rfid_port_1.isOpen()



def Read_Tag():
    # define variables
    global value_rfid_1, reply_rfid_1, tag
    
    # read port
    while int((datetime.now()-refTime).seconds) < 5:
        if (rfid_port_1.inWaiting() > 0):
            reply_rfid_1 = rfid_port_1.read(12)
            value_rfid_1 = str(reply_rfid_1[1:9])
            tag = str(value_rfid_1)
            print 'rfid_read.py -> tag hex', tag
            tag = int(tag, 16)
            print 'rfid_read.py -> tag dec ', tag
            break
        else:
            tag = None
    return tag



def Output_Tag():
    if tag == None:
        print 'rfid_read.py -> no tag'



def Flush_Port():
    rfid_port_1.flushInput()        # Clear input buffer
    time.sleep(0.1)



Read_Tag()
Output_Tag()
Flush_Port()
exit()

要从RC522中读取，我使用以下代码：

reader = SimpleMFRC522()

print("Hold a tag near the reader")

try:
    id, text = reader.read()
    print(id)
    print(text)

finally:
    GPIO.cleanup()

我可以确定来自串行读取器的字符串的长度和数字格式，但是我不能在RC522上这样做。我在这些页面( Github.com/mxgxw/MFRC522 522-python，Github.com/pimylifeup/MFRC522 522-python )上找到了一些关于库的信息，但是无法解释输出块的数据结构，我非常希望能在这方面提供一些帮助。

更新1.7.2019

如下所示，是这两项产出和SPI状态。

USB读取器的输出采用HEX和DEC数字格式：

rfid_read.py -> rfid reader on port /dev/ttyUSB1
rfid_read.py -> tag hex AC8C5E0A
rfid_read.py -> tag dec  2894880266

相同标记的RC522读取器的输出如下：

Hold a tag near the reader
44535950452

SPI状态：

pi@raspberrypi:~ $ lsmod | grep spi
spidev                 20480  0
spi_bcm2835            20480  0

Answer 1

我尝试了一种不同的方法，按照raspberrypi-spy.co.uk/2018/02/rc522-rfid-tag-read-raspberry-pi上的说明使用库Github.com/mxgxw/MFRC522 522-python。对我所拥有的标记使用这个库的输出UID是：

Card read UID: 86,209,188,187

而相同标记的GIGATEK MF7读取器的输出UID是：

hex: BBBCD156
dec: 3149713750

结论11.7.2019使用MFRC522-python库的输出是正确的，但不以正确的数字格式翻转：

BB BC D1 56 = 187 188 209 86

因此，我修改了库文件附带的Read.py标记UID读取脚本，以便像我想要的那样以十进制转换输出：

86 209 188 187 -> 56 D1 BC BB -> 3149713750

工作脚本：

def Read_Tag(self):
    # read with MFRC522 on GPIO
    # define variables
    global value_rfid_2, reply_rfid_2, tag, refTime
        
    # assign values
    refTime = datetime.now()
        
    # Create an object of the class MFRC522
    MIFAREReader = MFRC522.MFRC522()
        
    # read port
    while int((datetime.now()-refTime).seconds) < 5:
        # Scan for cards    
        (status,TagType) = MIFAREReader.MFRC522_Request(MIFAREReader.PICC_REQIDL)
        
        # If a card is found
        if status == MIFAREReader.MI_OK:
            print "Card detected"
            
        # Get the UID of the card
        (status,uid) = MIFAREReader.MFRC522_Anticoll()
        
        # If we have the UID, continue
        if status == MIFAREReader.MI_OK:
        
            # Print UID
            print "tag UID: %s,%s,%s,%s" % (uid[0], uid[1], uid[2], uid[3])
            tag_endian = (uid[3], uid[2], uid[1], uid[0])
            print 'tag endian:', tag_endian
            tag_hex = hex(uid[3]), hex(uid[2]), hex(uid[1]), hex(uid[0])
            print 'tag hex:', tag_hex
            tag_str = str(hex(uid[3])[2:]), str(hex(uid[2])[2:]), str(hex(uid[1])[2:]), str(hex(uid[0])[2:])
            print 'tag string:', tag_str
            tag_str = str(hex(uid[3])[2:])+str(hex(uid[2])[2:])+str(hex(uid[1])[2:])+str(hex(uid[0])[2:])
            print 'tag hex string concatenated:', tag_str
            tag = int(tag_str, 16)
            print 'tag dec:', tag
                
            # This is the default key for authentication
            key = [0xFF,0xFF,0xFF,0xFF,0xFF,0xFF]
               
            # Select the scanned tag
            MIFAREReader.MFRC522_SelectTag(uid)
        
            # Authenticate
            status = MIFAREReader.MFRC522_Auth(MIFAREReader.PICC_AUTHENT1A, 8, key, uid)
        
            # Check if authenticated
            if status == MIFAREReader.MI_OK:
                MIFAREReader.MFRC522_Read(8)
                MIFAREReader.MFRC522_StopCrypto1()
            else:
                print "Authentication error"
                
    GPIO.cleanup()      # Clear input buffer
    time.sleep(0.1)
    return tag