Last active
December 3, 2020 11:28
-
-
Save vongomben/182ba5b7d1fe7df943a1e117db27b361 to your computer and use it in GitHub Desktop.
Mifare Casting Code into String [FN]
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/**************************************************************************/ | |
/*! | |
This example will wait for any ISO14443A card or tag, and | |
depending on the size of the UID will attempt to read from it. | |
If the card has a 4-byte UID it is probably a Mifare | |
Classic card, and the following steps are taken: | |
- Authenticate block 4 (the first block of Sector 1) using | |
the default KEYA of 0XFF 0XFF 0XFF 0XFF 0XFF 0XFF | |
- If authentication succeeds, we can then read any of the | |
4 blocks in that sector (though only block 4 is read here) | |
If the card has a 7-byte UID it is probably a Mifare | |
Ultralight card, and the 4 byte pages can be read directly. | |
Page 4 is read by default since this is the first 'general- | |
purpose' page on the tags. | |
To enable debug message, define DEBUG in PN532/PN532_debug.h | |
*/ | |
/**************************************************************************/ | |
#if 0 | |
#include <SPI.h> | |
#include <PN532_SPI.h> | |
#include "PN532.h" | |
PN532_SPI pn532spi(SPI, 10); | |
PN532 nfc(pn532spi); | |
#elif 1 | |
#include <PN532_HSU.h> | |
#include <PN532.h> | |
PN532_HSU pn532hsu(Serial1); | |
PN532 nfc(pn532hsu); | |
#else | |
#include <Wire.h> | |
#include <PN532_I2C.h> | |
#include <PN532.h> | |
PN532_I2C pn532i2c(Wire); | |
PN532 nfc(pn532i2c); | |
#endif | |
void setup(void) { | |
Serial.begin(115200); | |
Serial.println("Hello!"); | |
nfc.begin(); | |
uint32_t versiondata = nfc.getFirmwareVersion(); | |
if (! versiondata) { | |
Serial.print("Didn't find PN53x board"); | |
while (1); // halt | |
} | |
// Got ok data, print it out! | |
Serial.print("Found chip PN5"); Serial.println((versiondata >> 24) & 0xFF, HEX); | |
Serial.print("Firmware ver. "); Serial.print((versiondata >> 16) & 0xFF, DEC); | |
Serial.print('.'); Serial.println((versiondata >> 8) & 0xFF, DEC); | |
// configure board to read RFID tags | |
nfc.SAMConfig(); | |
Serial.println("Waiting for an ISO14443A Card ..."); | |
} | |
void loop(void) { | |
uint8_t success; | |
uint8_t uid[] = { 0, 0, 0, 0, 0, 0, 0 }; // Buffer to store the returned UID | |
uint8_t uidLength; // Length of the UID (4 or 7 bytes depending on ISO14443A card type) | |
// Wait for an ISO14443A type cards (Mifare, etc.). When one is found | |
// 'uid' will be populated with the UID, and uidLength will indicate | |
// if the uid is 4 bytes (Mifare Classic) or 7 bytes (Mifare Ultralight) | |
success = nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A, uid, &uidLength); | |
if (success) { | |
// Display some basic information about the card | |
Serial.println("Found an ISO14443A card"); | |
Serial.print(" UID Length: "); Serial.print(uidLength, DEC); Serial.println(" bytes"); | |
Serial.print(" UID Value: "); | |
nfc.PrintHex(uid, uidLength); | |
Serial.println(uid[0], DEC); | |
Serial.println(uid[0], HEX); | |
Serial.println(""); | |
if (uidLength == 4) | |
{ | |
// Code to String | |
String code = String(uid[0]); | |
code += String(uid[1]); | |
code += String(uid[2]); | |
code += String(uid[3]); | |
Serial.print("code = "); | |
Serial.print(code); | |
Serial.println(" - - - - - "); | |
// We probably have a Mifare Classic card ... | |
Serial.println("Seems to be a Mifare Classic card (4 byte UID)"); | |
// Now we need to try to authenticate it for read/write access | |
// Try with the factory default KeyA: 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF | |
Serial.println("Trying to authenticate block 4 with default KEYA value"); | |
uint8_t keya[6] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF }; | |
// Start with block 4 (the first block of sector 1) since sector 0 | |
// contains the manufacturer data and it's probably better just | |
// to leave it alone unless you know what you're doing | |
success = nfc.mifareclassic_AuthenticateBlock(uid, uidLength, 4, 0, keya); | |
if (success) | |
{ | |
Serial.println("Sector 1 (Blocks 4..7) has been authenticated"); | |
uint8_t data[16]; | |
// If you want to write something to block 4 to test with, uncomment | |
// the following line and this text should be read back in a minute | |
// data = { 'a', 'd', 'a', 'f', 'r', 'u', 'i', 't', '.', 'c', 'o', 'm', 0, 0, 0, 0}; | |
// success = nfc.mifareclassic_WriteDataBlock (4, data); | |
// Try to read the contents of block 4 | |
success = nfc.mifareclassic_ReadDataBlock(4, data); | |
if (success) | |
{ | |
// Data seems to have been read ... spit it out | |
Serial.println("Reading Block 4:"); | |
nfc.PrintHexChar(data, 16); | |
Serial.println(""); | |
// Wait a bit before reading the card again | |
delay(1000); | |
} | |
else | |
{ | |
Serial.println("Ooops ... unable to read the requested block. Try another key?"); | |
} | |
} | |
else | |
{ | |
Serial.println("Ooops ... authentication failed: Try another key?"); | |
} | |
} | |
if (uidLength == 7) | |
{ | |
// Code to String | |
String code = String(uid[0]); | |
code += String(uid[1]); | |
code += String(uid[2]); | |
code += String(uid[3]); | |
code += String(uid[4]); | |
code += String(uid[5]); | |
code += String(uid[6]); | |
Serial.print("code = "); | |
Serial.print(code); | |
Serial.println(" - - - - - "); | |
// We probably have a Mifare Ultralight card ... | |
Serial.println("Seems to be a Mifare Ultralight tag (7 byte UID)"); | |
// Try to read the first general-purpose user page (#4) | |
Serial.println("Reading page 4"); | |
uint8_t data[32]; | |
success = nfc.mifareultralight_ReadPage (4, data); | |
if (success) | |
{ | |
// Data seems to have been read ... spit it out | |
nfc.PrintHexChar(data, 4); | |
Serial.println(""); | |
// Wait a bit before reading the card again | |
delay(1000); | |
} | |
else | |
{ | |
Serial.println("Ooops ... unable to read the requested page!?"); | |
} | |
} | |
} | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment