Dear Sir,
Please kindly help me with RFID KIT mastering.
I used standard demonstration software supplied with KIT Elegoo + Mega 2560
checked all attached mifare card and key.
As result system only read card but when to change UID, send error.
Then I purchase another two keys and check but result is the same.
Can you pleased help me
Below is the program text and message on serial port. I also attached wiring diagram and picture connections:
Serial port message:
Warning: this example overwrites the UID of your UID changeable card, use with care!
Card UID: AD F9 8C 02
Card did not respond to 0x40 after HALT command. Are you sure it is a UID changeable one?
Error name: A buffer is not big enough.
Activating the UID backdoor failed.
New UID and contents:
Card UID: AD F9 8C 02
Card SAK: 08
PICC type: MIFARE 1KB
Sector Block 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 AccessBits
15 63 00 00 00 00 00 00 FF 07 80 69 FF FF FF FF FF FF [ 0 0 1 ]
62 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 0 0 0 ]
……
progamm:
#include <SPI.h>
#include <MFRC522.h>
#define RST_PIN 8 // Configurable, see typical pin layout above
#define SS_PIN 53 // Configurable, see typical pin layout above
MFRC522 mfrc522(SS_PIN, RST_PIN); // Create MFRC522 instance
/* Set your new UID here! */
#define NEW_UID {0xDE, 0xAD, 0xBE, 0xEF}
MFRC522::MIFARE_Key key;
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 card
Serial.println(F("Warning: this example overwrites the UID of your UID changeable card, use with care!"));
// Prepare key - all keys are set to FFFFFFFFFFFFh at chip delivery from the factory.
for (byte i = 0; i < 6; i++) {
key.keyByte = 0xFF;
- }*
}
// Setting the UID can be as simple as this:
//void loop() {
// byte newUid[] = NEW_UID;
// if ( mfrc522.MIFARE_SetUid(newUid, (byte)4, true) ) {
// Serial.println("Wrote new UID to card.");
// }
// delay(1000);
//}
// But of course this is a more proper approach
void loop() {
-
// Look for new cards, and select one if present*
-
if ( ! mfrc522.PICC_IsNewCardPresent() || ! mfrc522.PICC_ReadCardSerial() ) {*
-
delay(50);*
-
return;*
-
}*
-
// Now a card is selected. The UID and SAK is in mfrc522.uid.*
-
// Dump UID*
-
Serial.print(F("Card UID:"));*
-
for (byte i = 0; i < mfrc522.uid.size; i++) {*
_ Serial.print(mfrc522.uid.uidByte < 0x10 ? " 0" : " ");_
_ Serial.print(mfrc522.uid.uidByte*, HEX);
}
Serial.println();*_
* // Dump PICC type*
// MFRC522::PICC_Type piccType = mfrc522.PICC_GetType(mfrc522.uid.sak);
// Serial.print(F("PICC type: "));
// Serial.print(mfrc522.PICC_GetTypeName(piccType));
// Serial.print(F(" (SAK "));
// Serial.print(mfrc522.uid.sak);
// Serial.print(")\r\n");
// if ( piccType != MFRC522::PICC_TYPE_MIFARE_MINI
// && piccType != MFRC522::PICC_TYPE_MIFARE_1K
// && piccType != MFRC522::PICC_TYPE_MIFARE_4K) {
// Serial.println(F("This sample only works with MIFARE Classic cards."));
// return;
// }
* // Set new UID*
* byte newUid[] = NEW_UID;
if ( mfrc522.MIFARE_SetUid(newUid, (byte)4, true) ) {
_ Serial.println(F("Wrote new UID to card."));
}*_
* // Halt PICC and re-select it so DumpToSerial doesn't get confused*
* mfrc522.PICC_HaltA();
if ( ! mfrc522.PICC_IsNewCardPresent() || ! mfrc522.PICC_ReadCardSerial() ) {
_ return;
}*_
* // Dump the new memory contents*
* Serial.println(F("New UID and contents:"));*
* mfrc522.PICC_DumpToSerial(&(mfrc522.uid));*
* delay(2000);*
}
