完成后可以在路径/proc/device-tree/soc/spi中看到 rfid_rc522@00 设备节点。 注意:当设备驱动加载成功后,会在路径/sys/class中看到相应的设备信息。 /** * @brief 向 spi 设备中写入多个寄存器数据 * * @param spi spi 设备 * @param reg 要写入的寄存器首地址 * @param buf 要写入的数据缓冲区 * @...
SPI read data Reading data using SPI requires the byte order shown in Table 6 to be used. It is possible to read out up to n-data bytes. The first byte sent defines both the mode and the address. Table 6. MOSI and MISO byte order Line Byte 0 Byte 1 Byte 2 To Byte n Byte n ...
* you present a PICC (that is: a RFID Tag or Card) at reading distance of the MFRC522 Reader/PCD, the serial output * will show the type, and the NUID if a new card has been detected. Note: you may see "Timeout in communication" messages * when removing the PICC from reading d...
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 ...
The RC522 module usually comes with an RFID card and a key fob. And each of these comes with a 1KB of memory. We can not only read these tags but can also program these with the RC522 module. Here is the picture showing the tags along with the RC522 module. ...
while continue_reading: # 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 ...
println(F("Failed to authenticate to card for reading, could not set UID: ")); Serial.println(GetStatusCodeName(status)); } return false; } } else { if (logErrors) { Serial.print(F("PCD_Authenticate() failed: ")); Serial.println(GetStatusCodeName(status)); }...
Reading with the RFID RC522 Now that we have written our script to write to RFID tags using our RC522 we can now write a script that will read this data back off the tag. 1. Let’s start off by changing the directory to make sure we are in the right place, we will also use “...
Library takes care of polling the cards and managing the card lifecycle. It also fires events when a card is detected, removed, or when the card changes to any state described in ISO-14443. Additionally, it provides an API for reading and writing to card memory blocks. ...
射频识别，即RFID是Radio Frequency Ident ificat ion的缩写，又称无线射频识别，是一.种通信技术，...