Diff: main.cpp

Revision:

0:9d2afe43dcf1

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sat Oct 20 13:39:41 2018 +0000
@@ -0,0 +1,162 @@
+#include "PN532_I2C.h"
+#include "PN532.h"
+#include <inttypes.h>
+#include "mbed.h"
+
+
+DigitalOut ledBrd (LED1);   // arducleo onboard led
+ 
+DigitalOut ledNFC (LED2);     // status led
+ 
+DigitalOut rstNFC (D4);     // pn532 chip reset control
+  
+Serial pc(USBTX, USBRX);
+ 
+ 
+// ----------------------------------------- I2C
+I2C pn532_i2c (I2C_SDA, I2C_SCL);
+PN532_I2C pn532_if (pn532_i2c);
+ 
+int acceptedCard = 1232695128;
+ 
+PN532 nfc(pn532_if);
+ 
+/*==============================================================================
+ * \brief reset the pn532 chip
+ */
+void reset_chip (void)
+{
+    rstNFC = 0;
+    wait_ms (100);
+    rstNFC = 1;
+}
+ 
+ 
+/*==============================================================================
+ * \brief init the peripheral
+ */
+void setup(void)
+{
+    ledBrd = 0;
+    ledNFC = 0;
+    reset_chip ();
+ 
+    uint32_t versiondata = 0;
+    pc.baud(115200);
+    pc.printf ("Hello!\n");
+ 
+    while (1) {
+        nfc.begin();
+        nfc.SAMConfig();
+        versiondata = nfc.getFirmwareVersion();
+        if (! versiondata) {
+            pc.printf("Didn't find PN53x board\n\n");
+            wait_ms(500);
+        } else {
+            break;
+        }
+    }
+ 
+    // Got ok data, print it out!
+    pc.printf ("Found chip PN5%02X , Firmware ver. %d.%d\n",
+               (versiondata>>24) & 0xFF,
+               (versiondata>>16) & 0xFF,
+               (versiondata>>8) & 0xFF);
+ 
+    // Set the max number of retry attempts to read from a card
+    // This prevents us from waiting forever for a card, which is
+    // the default behaviour of the PN532.
+    nfc.setPassiveActivationRetries(0xFF);
+ 
+    // configure board to read RFID tags
+    nfc.SAMConfig();
+ 
+    pc.printf ("\nWaiting for an ISO14443A card\n");
+}
+ 
+ 
+/*==============================================================================
+ * \brief find a tag
+ */
+void loop(void)
+{
+    bool 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)
+ 
+    // configure board to read RFID tags
+    nfc.SAMConfig();
+ 
+    // 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[0], &uidLength);
+ 
+    printf ("\n");
+ 
+    if (success) {     
+        ledNFC = 1;             // led on
+        
+        pc.printf("Found a card!\n");
+ 
+        pc.printf("UID Length: %d bytes\n", uidLength);
+        pc.printf("UID Value: ");
+        //int id = 0; //create a variable to build the user id into
+        for (uint8_t i=0; i < uidLength; i++)
+        {
+            pc.printf("%d",uid[i]); 
+        }
+        pc.printf("\r\n");
+        
+        
+        /* COMPUTER SCIENCE GROUP CHAT OPTION 
+        int result = 0;
+        for (int i = 0; i < uidLength; i++) {
+        result = result + (uid[i] * pow(10.0, (uidLength-i)-1));
+        }
+        pc.printf("Result: %d \r\n",result);
+        */
+        
+        // DAVID BARNES OPTION
+        unsigned long sum = 0;
+        for(int i = 0; i < sizeof(uid) / sizeof(*uid); i++) {
+             sum = (sum * 10) + uid[i];
+        }
+        printf("Sum: %lu", sum);
+        
+        /* ONLINE FORUM OPTION
+        uint32_t cardidentifier = 0;
+        cardidentifier = uid[0];
+        cardidentifier >>= 8; cardidentifier |= uid[1];
+        cardidentifier >>= 8; cardidentifier |= uid[2];
+        cardidentifier >>= 8; cardidentifier |= uid[3];
+        pc.printf("My number: %u \r\n",cardidentifier);
+        */
+        pc.printf("Correct number %u \r\n", acceptedCard);
+        
+        wait_ms (100);
+        ledNFC = 0; //turn off red and turn on green
+        //green led to show it is the right card
+        // wait until the card is taken away
+        while (nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A, &uid[0], &uidLength, 500)) {}
+ 
+        ledNFC = 0;         // led off
+    } else {
+        // PN532 probably timed out waiting for a card
+        pc.printf("\nTimed out waiting for a card\n");
+        ledNFC = 0;
+        wait_ms (200);
+    }
+}
+ 
+ 
+/*==============================================================================
+ * \brief main entry
+ */
+int main()
+{
+    setup();
+ 
+    while (1)
+        loop ();
+}
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