Created
January 15, 2013 03:10
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Write hello world NDEF message. Cheat by hardcoding bytes.
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// | |
// Write "Hello, world!" in a plain text NDEF message | |
// Tag must be a Mifare Classic with a 4 byte ID | |
// Tested with Samsung TecTile | |
// | |
#include <Wire.h> | |
#include <Adafruit_NFCShield_I2C.h> | |
#define IRQ (2) | |
#define RESET (3) // Not connected by default on the NFC Shield | |
Adafruit_NFCShield_I2C nfc(IRQ, RESET); | |
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(""); | |
if (uidLength == 4) | |
{ | |
// 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 | |
Serial.println("Trying to authenticate block 4 with default KEYA value"); | |
//uint8_t keya[6] = { 0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5 }; // this is the NDEF header key | |
// TODO check the spec and rename I think this is the A key | |
uint8_t key[6] = { 0xD3, 0xF7, 0xD3, 0xF7, 0xD3, 0xF7 }; // this is Sector 1 - 15 key | |
// 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, key); | |
if (success) | |
{ | |
Serial.println("Sector 1 (Blocks 4..7) has been authenticated"); | |
// output from javascript message builder | |
// 00 00 03 14 d1 01 10 54 02 65 6e 48 65 6c 6c 6f | |
// 2c 20 77 6f 72 6c 64 21 fe | |
// TLV 0x03 with a length of 0x14 | |
// TNF 0xD1 - TNF_WELL_KNOWN, mb=true, me=true, c=false, sr=true, il=false | |
// Type Length 0x1 | |
// Payload Length 0x10 | |
// RTD_TEXT 0x54 | |
// begin payload | |
// Text Encoding Length 0x2 | |
// Text Encoding [0x65, 0x6E] "en" | |
// Message [0x48, 0x65, 0x6C, 0x6C, 0x6F, 0x2C, 0x20, 0x77, 0x6F, 0x72, 0x6C, 0x64, 0x21] "Hello, world!" | |
// End 0xFE | |
uint8_t sectorbuffer1[16] = {0x00, 0x00, 0x03, 0x14, 0xD1, 0x01, 0x10, 0x54, 0x02, 0x65, 0x6E, 0x48, 0x65, 0x6C, 0x6C, 0x6F}; | |
uint8_t sectorbuffer2[16] = {0x2C, 0x20, 0x77, 0x6F, 0x72, 0x6C, 0x64, 0x21, 0xFE, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}; | |
int write_success = nfc.mifareclassic_WriteDataBlock (4, sectorbuffer1); | |
if (write_success) { | |
Serial.println("wrote block 4"); | |
} else { | |
Serial.println("write failed"); | |
} | |
write_success = nfc.mifareclassic_WriteDataBlock (5, sectorbuffer2); | |
if (write_success) { | |
Serial.println("wrote block 5"); | |
} else { | |
Serial.println("write failed"); | |
} | |
Serial.println("Try and read the tag with your phone"); | |
// Wait a bit before writing the card again | |
delay(2000); | |
} | |
else | |
{ | |
Serial.println("Ooops ... authentication failed: Try another key?"); | |
} | |
} | |
if (uidLength == 7) | |
{ | |
// 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!?"); | |
} | |
} | |
} | |
} |
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