Yihui Xiong
/
PN532_P2P
Use Seeeduino Arch(or Arch Pro) + NFC Shield to exchange NDEF messages with Android 4.0+
Diff: main.cpp
- Revision:
- 0:21ac4fe1ccf8
- Child:
- 1:f228fdc41598
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/main.cpp Thu Oct 17 07:14:21 2013 +0000 @@ -0,0 +1,139 @@ +/** + * Seeeduino Arch + NFC Shield write a NDEF record to a NFC tag + */ + + +#include "mbed.h" +#include "PN532.h" + +#if 0 + +#define LOG(args...) + +#else +#include "USBSerial.h" + +#define LOG(args...) pc.printf(args) + +USBSerial pc; +//Serial pc(USBTX, USBRX); +#endif + +// PN532(mosi, miso, clk, cs) +PN532 nfc(P1_22, P1_21, P1_20, P0_2); + +DigitalOut led1(LED1); + +/* + We can encode many different kinds of pointers to the card, + from a URL, to an Email address, to a phone number, and many more + check the library header .h file to see the large # of supported + prefixes! +*/ +// For a http://www. url: +const char *url = "seeedstudio.com"; +uint8_t ndefprefix = NDEF_URIPREFIX_HTTP_WWWDOT; + +// for an email address +//const char * url = "mail@example.com"; +//uint8_t ndefprefix = NDEF_URIPREFIX_MAILTO; + +// for a phone number +//const char * url = "+1 212 555 1212"; +//uint8_t ndefprefix = NDEF_URIPREFIX_TEL; + +int main() +{ + + nfc.begin(); + uint32_t versiondata = nfc.getFirmwareVersion(); + if (! versiondata) { + LOG("Didn't find PN532\r\n"); + while (1) { + led1 = !led1; + wait(0.1); + } + } + + LOG("Found chip PN5%2X\r\n", versiondata >> 24); + LOG("Firmware V%d.%d\r\n", (versiondata >> 16) & 0xFF, (versiondata >> 8) & 0xFF); + + nfc.SAMConfig(); + + + while (1) { + uint8_t success; // Flag to check if there was an error with the PN532 + uint8_t uid[] = { 0, 0, 0, 0, 0, 0, 0 }; // Buffer to store the continueed UID + uint8_t uidLength; // Length of the UID (4 or 7 bytes depending on ISO14443A card type) + bool authenticated = false; // Flag to indicate if the sector is authenticated + + // Use the default NDEF keys (these would have have set by mifareclassic_formatndef.pde!) + uint8_t keya[6] = { 0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5 }; + uint8_t keyb[6] = { 0xD3, 0xF7, 0xD3, 0xF7, 0xD3, 0xF7 }; + + LOG("Place your NDEF formatted Mifare Classic card on the reader to update the NDEF record\r\n"); + + // Wait for an ISO14443A type card (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, 0); + + if (success) { + // Display some basic information about the card + LOG("Found an ISO14443A card\r\n"); + LOG("UID length: %d\r\nUID Value: ", uidLength); + for (uint8_t i = 0; i < uidLength; i++) { + LOG("0x%X ", uid[i]); + } + + // Make sure this is a Mifare Classic card + if (uidLength != 4) { + LOG("Ooops ... this doesn't seem to be a Mifare Classic card!\r\n"); + continue; + } + + // We probably have a Mifare Classic card ... + LOG("Seems to be a Mifare Classic card (4 byte UID)\r\n"); + + // Check if this is an NDEF card (using first block of sector 1 from mifareclassic_formatndef.pde) + // Must authenticate on the first key using 0xD3 0xF7 0xD3 0xF7 0xD3 0xF7 + success = nfc.mifareclassic_AuthenticateBlock (uid, uidLength, 4, 0, keyb); + if (!success) { + LOG("Unable to authenticate block 4 ... is this card NDEF formatted?\r\n"); + continue; + } + + LOG("Authentication succeeded (seems to be an NDEF/NFC Forum tag) ...\r\n"); + + // Authenticated seems to have worked + // Try to write an NDEF record to sector 1 + // Use 0x01 for the URI Identifier Code to prepend "http://www." + // to the url (and save some space). For information on URI ID Codes + // see http://www.ladyada.net/wiki/private/articlestaging/nfc/ndef + if (strlen(url) > 38) { + // The length is also checked in the WriteNDEFURI function, but lets + // warn users here just in case they change the value and it's bigger + // than it should be + LOG("URI is too long ... must be less than 38 characters!\r\n"); + continue; + } + + LOG("Updating sector 1 with URI as NDEF Message\r\n"); + + // URI is within size limits ... write it to the card and report success/failure + success = nfc.mifareclassic_WriteNDEFURI(1, ndefprefix, url); + if (success) { + LOG("NDEF URI Record written to sector 1\r\n"); + LOG("\r\n"); + } else { + LOG("NDEF Record creation failed! :(\r\n"); + } + } else { + LOG("Didn't find a NFC tag\r\n"); + } + + // Wait a bit before trying again + LOG("\n\nDone!\r\n"); + wait(1); + } +}