main.cpp

00001 
00002 #include "mbed.h"
00003 #include "ChainableLED.h"
00004 #include "PN532_SPI.h"
00005 #include "emulatetag.h "
00006 #include "NdefMessage.h"
00007 
00008 #include <string.h>
00009 
00010 #define LOG(args...)    
00011 
00012 BusOut leds(LED1, LED2, LED3, LED4);
00013 
00014 ChainableLED rgbled(P1_14, P1_13, 1);
00015 
00016 SPI spi(P1_22, P1_21, P1_20);
00017 PN532_SPI interface(spi, P0_2);
00018 EmulateTag nfc(interface);
00019 
00020 uint8_t ndefBuf[120];
00021 NdefMessage message;
00022 int messageSize;
00023 
00024 uint8_t uid[3] = { 0x12, 0x34, 0x56 };
00025 
00026 uint32_t getColor(uint8_t *buf)
00027 {
00028     uint32_t x = 0;
00029     for (uint8_t i = 0; i < 8; i++) {
00030         uint8_t c = *buf;
00031         if (c >= '0' && c <= '9') {
00032             x *= 16;
00033             x += c - '0';
00034         } else if (c >= 'A' && c <= 'F') {
00035             x *= 16;
00036             x += (c - 'A') + 10;
00037         } else if (c >= 'a' && c <= 'f') {
00038             x *= 16;
00039             x += (c - 'a') + 10;
00040         } else 
00041             break;
00042 
00043         buf++;
00044     }
00045 
00046     return x;
00047 }
00048 
00049 void processNewNdef(uint8_t *buf, uint16_t length)
00050 {
00051     NdefMessage msg = NdefMessage(buf, length);
00052 
00053     NdefRecord record = msg.getRecord(0);
00054     uint8_t recordbuf[32];
00055     record.getType(recordbuf);
00056     if (!memcmp(recordbuf, "text/c", 6)) {
00057         uint8_t r, g, b;
00058         uint32_t color;
00059         record.getPayload(recordbuf);
00060         color = getColor(recordbuf);
00061         r = (color >> 16) & 0xFF;
00062         g = (color >> 8) & 0xFF;
00063         b = color & 0xFF;
00064         
00065         rgbled.setColorRGB(0, r, g, b);
00066         leds = r;
00067     }
00068 } 
00069 
00070 int main()
00071 {
00072     LOG("------- Emulate Tag --------\n");
00073     rgbled.setColorRGB(0, 0, 0, 0);
00074 
00075     NdefRecord aarRecord = NdefRecord();
00076     const uint8_t aarType[] = "android.com:pkg";
00077     const uint8_t aarPayload[] = "com.seeedstudio.android.nfc.touchpixel";
00078 
00079     aarRecord.setTnf(TNF_EXTERNAL_TYPE);
00080     aarRecord.setType(aarType, sizeof(aarType) - 1);
00081     aarRecord.setPayload(aarPayload, sizeof(aarPayload) - 1);
00082 
00083     message = NdefMessage();
00084     message.addMimeMediaRecord("text/c", "FF000000");
00085     message.addRecord(aarRecord);
00086     messageSize = message.getEncodedSize();
00087     if (messageSize > sizeof(ndefBuf)) {
00088         while (1) { }
00089     }
00090 
00091     LOG("Ndef encoded message size: %d\n", messageSize);
00092 
00093     message.encode(ndefBuf);
00094 
00095     // comment out this command for no ndef message
00096     nfc.setNdefFile(ndefBuf, messageSize);
00097 
00098     // uid must be 3 bytes!
00099     nfc.setUid(uid);
00100 
00101     nfc.init();
00102 
00103     nfc.attach(processNewNdef);
00104 
00105     while (1) {
00106         //nfc.setNdefFile(ndefBuf, messageSize);
00107         nfc.emulate();
00108     }
00109 }