'class MFRC522'has no member named'PCD_DumpVersionToSerial'

Question

當我試圖從RFID卡中轉儲信息時，屏幕截圖中的代碼如下class MFRC522沒有任何成員，名稱爲PCD_DumpVersionToSerial錯誤顯示。親切的建議我最好。你的答案會令人高興。

Answer 1

這裏的代碼是給錯誤而編譯

/* 
* -------------------------------------------------------------------------------------------------------------------- 
* Example sketch/program showing how to read data from a PICC to serial. 
* -------------------------------------------------------------------------------------------------------------------- 
* This is a MFRC522 library example; for further details and other examples see: https://github.com/miguelbalboa/rfid 
* 
* Example sketch/program showing how to read data from a PICC (that is: a RFID Tag or Card) using a MFRC522 based RFID 
* Reader on the Arduino SPI interface. 
* 
* When the Arduino and the MFRC522 module are connected (see the pin layout below), load this sketch into Arduino IDE 
* then verify/compile and upload it. To see the output: use Tools, Serial Monitor of the IDE (hit Ctrl+Shft+M). When 
* 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 ID/UID, type and any data blocks it can read. Note: you may see "Timeout in communication" messages 
* when removing the PICC from reading distance too early. 
* 
* If your reader supports it, this sketch/program will read all the PICCs presented (that is: multiple tag reading). 
* So if you stack two or more PICCs on top of each other and present them to the reader, it will first output all 
* details of the first and then the next PICC. Note that this may take some time as all data blocks are dumped, so 
* keep the PICCs at reading distance until complete. 
* 
* @license Released into the public domain. 
* 
* Typical pin layout used: 
* ----------------------------------------------------------------------------------------- 
*    MFRC522  Arduino  Arduino Arduino Arduino   Arduino 
*    Reader/PCD Uno/101  Mega  Nano v3 Leonardo/Micro Pro Micro 
* Signal  Pin   Pin   Pin  Pin  Pin    Pin 
* ----------------------------------------------------------------------------------------- 
* RST/Reset RST   9    5   D9   RESET/ICSP-5  RST 
* SPI SS  SDA(SS)  10   53  D10  10    10 
* SPI MOSI MOSI   11/ICSP-4 51  D11  ICSP-4   16 
* SPI MISO MISO   12/ICSP-1 50  D12  ICSP-1   14 
* SPI SCK  SCK   13/ICSP-3 52  D13  ICSP-3   15 
*/ 

#include <SPI.h> 
#include <MFRC522.h> 

constexpr uint8_t RST_PIN = 9;   // Configurable, see typical pin layout above 
constexpr uint8_t SS_PIN = 10;   // Configurable, see typical pin layout above 

MFRC522 mfrc522(SS_PIN, RST_PIN); // Create MFRC522 instance 

void setup() { 
    Serial.begin(9600);  // Initialize serial communications with the PC 
    while (!Serial);  // Do nothing if no serial port is opened (added for Arduinos based on ATMEGA32U4) 
    SPI.begin();   // Init SPI bus 
    mfrc522.PCD_Init();  // Init MFRC522 
    mfrc522.PCD_DumpVersionToSerial(); // Show details of PCD - MFRC522 Card Reader details 
    Serial.println(F("Scan PICC to see UID, SAK, type, and data blocks...")); 
} 

void loop() { 
    // Look for new cards 
    if (! mfrc522.PICC_IsNewCardPresent()) { 
     return; 
    } 

    // Select one of the cards 
    if (! mfrc522.PICC_ReadCardSerial()) { 
     return; 
    } 

    // Dump debug info about the card; PICC_HaltA() is automatically called 
    mfrc522.PICC_DumpToSerial(&(mfrc522.uid)); 
}