如何解决树莓派 pico rfid rc522 (Micropython)
我想使用我的 RPi Pico 从 mfrc522 (Iduino RFID-rc522) 读卡器读取数据，但我不知道该怎么做。我试图使用为此目的制作的 mfrc522.py MicroPython 库。 Reader 正在通过 SPI 与 Pi 通信，我将其连接到 SPI0。 pi上的代码：
import time
from machine import I2C,Pin,SPI
from mfrc522 import MFRC522
sck = Pin(6,Pin.OUT)
mosi = Pin(7,Pin.OUT)
miso = Pin(4,Pin.OUT)
spi = SPI(0,baudrate=100000,polarity=0,phase=0,sck=sck,mosi=mosi,miso=miso)
sda = Pin(5,Pin.OUT)
rst = Pin(22,Pin.OUT)
while True:
rdr = MFRC522(spi,sda,rst)
uid = ""
(stat,tag_type) = rdr.request(rdr.REQIDL)
if stat == rdr.OK:
(stat,raw_uid) = rdr.anticoll()
if stat == rdr.OK:
uid = ("0x%02x%02x%02x%02x" % (raw_uid[0],raw_uid[1],raw_uid[2],raw_uid[3]))
print(uid)
和图书馆：
from machine import Pin,SPI
from os import uname
class MFRC522:
OK = 0
NOTAGERR = 1
ERR = 2
REQIDL = 0x26
REQALL = 0x52
AUTHENT1A = 0x60
AUTHENT1B = 0x61
def __init__(self,spi,cs,rst):
self.spi = spi
self.cs = cs
self.rst = rst
self.rst.value(0)
self.cs.value(1)
self.spi.init()
self.rst.value(1)
self.init()
def _wreg(self,reg,val):
self.cs.value(0)
self.spi.write(b'%c' % int(0xff & ((reg << 1) & 0x7e)))
self.spi.write(b'%c' % int(0xff & val))
self.cs.value(1)
def _rreg(self,reg):
self.cs.value(0)
self.spi.write(b'%c' % int(0xff & (((reg << 1) & 0x7e) | 0x80)))
val = self.spi.read(1)
self.cs.value(1)
return val[0]
def _sflags(self,mask):
self._wreg(reg,self._rreg(reg) | mask)
def _cflags(self,self._rreg(reg) & (~mask))
def _tocard(self,cmd,send):
recv = []
bits = irq_en = wait_irq = n = 0
stat = self.ERR
if cmd == 0x0E:
irq_en = 0x12
wait_irq = 0x10
elif cmd == 0x0C:
irq_en = 0x77
wait_irq = 0x30
self._wreg(0x02,irq_en | 0x80)
self._cflags(0x04,0x80)
self._sflags(0x0A,0x80)
self._wreg(0x01,0x00)
for c in send:
self._wreg(0x09,c)
self._wreg(0x01,cmd)
if cmd == 0x0C:
self._sflags(0x0D,0x80)
i = 2000
while True:
n = self._rreg(0x04)
i -= 1
if ~((i != 0) and ~(n & 0x01) and ~(n & wait_irq)):
break
self._cflags(0x0D,0x80)
if i:
if (self._rreg(0x06) & 0x1B) == 0x00:
stat = self.OK
if n & irq_en & 0x01:
stat = self.NOTAGERR
elif cmd == 0x0C:
n = self._rreg(0x0A)
lbits = self._rreg(0x0C) & 0x07
if lbits != 0:
bits = (n - 1) * 8 + lbits
else:
bits = n * 8
if n == 0:
n = 1
elif n > 16:
n = 16
for _ in range(n):
recv.append(self._rreg(0x09))
else:
stat = self.ERR
return stat,recv,bits
def _crc(self,data):
self._cflags(0x05,0x04)
self._sflags(0x0A,0x80)
for c in data:
self._wreg(0x09,c)
self._wreg(0x01,0x03)
i = 0xFF
while True:
n = self._rreg(0x05)
i -= 1
if not ((i != 0) and not (n & 0x04)):
break
return [self._rreg(0x22),self._rreg(0x21)]
def init(self):
self.reset()
self._wreg(0x2A,0x8D)
self._wreg(0x2B,0x3E)
self._wreg(0x2D,30)
self._wreg(0x2C,0)
self._wreg(0x15,0x40)
self._wreg(0x11,0x3D)
self.antenna_on()
def reset(self):
self._wreg(0x01,0x0F)
def antenna_on(self,on=True):
if on and ~(self._rreg(0x14) & 0x03):
self._sflags(0x14,0x03)
else:
self._cflags(0x14,0x03)
def request(self,mode):
self._wreg(0x0D,0x07)
(stat,bits) = self._tocard(0x0C,[mode])
if (stat != self.OK) | (bits != 0x10):
stat = self.ERR
return stat,bits
def anticoll(self):
ser_chk = 0
ser = [0x93,0x20]
self._wreg(0x0D,0x00)
(stat,ser)
if stat == self.OK:
if len(recv) == 5:
for i in range(4):
ser_chk = ser_chk ^ recv[i]
if ser_chk != recv[4]:
stat = self.ERR
else:
stat = self.ERR
return stat,recv
def select_tag(self,ser):
buf = [0x93,0x70] + ser[:5]
buf += self._crc(buf)
(stat,buf)
return self.OK if (stat == self.OK) and (bits == 0x18) else self.ERR
def auth(self,mode,addr,sect,ser):
return self._tocard(0x0E,[mode,addr] + sect + ser[:4])[0]
def stop_crypto1(self):
self._cflags(0x08,0x08)
def read(self,addr):
data = [0x30,addr]
data += self._crc(data)
(stat,_) = self._tocard(0x0C,data)
return recv if stat == self.OK else None
def write(self,data):
buf = [0xA0,addr]
buf += self._crc(buf)
(stat,buf)
if not (stat == self.OK) or not (bits == 4) or not ((recv[0] & 0x0F) == 0x0A):
stat = self.ERR
else:
buf = []
for i in range(16):
buf.append(data[i])
buf += self._crc(buf)
(stat,buf)
if not (stat == self.OK) or not (bits == 4) or not ((recv[0] & 0x0F) == 0x0A):
stat = self.ERR
return stat
我的输出是绝对清晰的，我没有得到任何打印。我的问题在哪里？
解决方法
在解决这个问题并发布一个被删除的无用答案之后，我终于设法让它工作了。看看 raspberry.org 上的这个帖子，尤其是那里提到的来自 danjperron 的 GitHub repo。
我将代码复制到我的 Pico 并将 examples/Pico_read.py 第 11 行中的引脚编号更改为 reader = MFRC522(spi_id=0,sck=6,miso=4,mosi=7,cs=5,rst=22) 以匹配您使用的引脚。如果有效，它会打印出类似 Card detected 0C9B5023 的内容。
味噌是pico的输入。尝试将味噌引脚分配更改为味噌 = Pin(4,Pin.IN,Pin.PULL_DOWN)
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