micropython+ESP32S3+MFRC522射频卡模块读卡号
参考连接：https://doc.itprojects.cn/A0004.iot/01.doc.c0e19433a76e2e42f143ba0ded917201/index.html#/q02.rfid.01
１）ESP32S3+MFRC522射频卡模块图
# 接线说明
# MFRC522_sck = ESP32S3_Pin(14)
# MFRC522_mosi = ESP32S3_Pin(13)
# MFRC522_miso = ESP32S3_Pin(12)
# MFRC522_sda = ESP32S3_Pin(9) 片选信号
２）ESP32-S3资料
参考原文链接：https://blog.csdn.net/MJiarong_personal/article/details/121726585
乐鑫官网资料：https://www.espressif.com/sites/default/files/documentation/esp32-s3_datasheet_cn.pdf
注意：STRAP管脚不可以用。
3）编程
函数参考：https://docs.micropython.org/en/latest/esp32/quickref.html#software-spi-bus
mfrc522.py存放在ESP32-S3芯片内
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): self.spi = spi self.cs = cs self.cs.value(1) self.spi.init() 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, reg, mask): self._wreg(reg, self._rreg(reg) | mask) def _cflags(self, reg, mask): self._wreg(reg, 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, recv, 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, recv, bits) = self._tocard(0x0C, 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, recv, bits) = self._tocard(0x0C, 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, recv, _) = self._tocard(0x0C, data) return recv if stat == self.OK else None def write(self, addr, data): buf = [0xA0, addr] buf += self._crc(buf) (stat, recv, bits) = self._tocard(0x0C, 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, recv, bits) = self._tocard(0x0C, buf) if not (stat == self.OK) or not (bits == 4) or not ((recv[0] & 0x0F) == 0x0A): stat = self.ERR return stat
test.py代码可放在ESP32-S3芯片内，也可放在PC内仅供调试
from time import sleep_ms from machine import Pin, SPI, SoftSPI # 导入自定义模块 from mfrc522 import MFRC522 # 接线说明 # MFRC522_sck = ESP32S3_Pin(14) # MFRC522_mosi = ESP32S3_Pin(13) # MFRC522_miso = ESP32S3_Pin(12) # MFRC522_sda = ESP32S3_Pin(9) 片选信号 # 创建SPI对象 spi = SPI(1, 10000000, polarity=0, phase=0, sck=Pin(14), mosi=Pin(13), miso=Pin(12)) # 片选信号的引脚是25 sda = Pin(9, Pin.OUT) def read_id(): # 1. 创建RFID操作对象 rfid = MFRC522(spi, sda) # 2. 循环读取数据 while True: # 3. 复位应答 stat, tag_type = rfid.request(rfid.REQIDL) print(stat) print(tag_type) if stat == rfid.OK: # 4. 防冲突检测，提取id号 stat, raw_uid = rfid.anticoll() if stat == rfid.OK: _id = "0x%02x%02x%02x%02x" % (raw_uid[0], raw_uid[1], raw_uid[2], raw_uid[3]) print("rfid卡片的id:", _id) sleep_ms(500) if __name__ == "__main__": read_id()
测试结果图
