Code to utilize either shield individually works flawlessly. Yet when I combine the code for the two the arduino locks up or resets constantly when trying to read a card with the NFC Shield and print the data.
As far as I can tell both use the I2C pins analog 4 and 5, the data logger uses pin 10 for chipselect, and the NFC Shield uses pins 2 and 3 for interrupt and reset. Is this an issue with a hardware conflict I'm not seeing or is my code broken somehow?
Thanks for any help anyone can offer,
James
Code: Select all
/* SD Card Setup */
#include <SPI.h>
#include <SD.h>
const int chipSelect = 10;
File myFile;
/* RealTime Clock Setup */
#include <Wire.h>
#include "RTClib.h"
RTC_DS1307 rtc;
/* NFCShield Setup */
//#include <Wire.h> // already included above
#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()
{
// Start Serial communications, high baud rate to keep up with the NFC reader.
Serial.begin(115200);
// Startup SD Card
/* If this part is uncommented things hang in loop() after the card is detected and the first block is read and trying to be printed.
if (!SD.begin(chipSelect)) {
Serial.println("SD initialization failed!");
return;
}
Serial.println("SD initialization done.");
*/
Serial.println("##############################");
// Start RTC stuff
Wire.begin();
rtc.begin();
DateTime ts;
ts = rtc.now();
Serial.print(ts.year(), DEC);
Serial.print('/');
Serial.print(ts.month(), DEC);
Serial.print('/');
Serial.print(ts.day(), DEC);
Serial.print(' ');
Serial.print(ts.hour(), DEC);
Serial.print(':');
Serial.print(ts.minute(), DEC);
Serial.print(':');
Serial.print(ts.second(), DEC);
Serial.print(" = ");
Serial.print(ts.unixtime());
Serial.print("s / ");
Serial.print(ts.unixtime() / 86400L);
Serial.print("d since 1970");
Serial.println();
Serial.println("##############################");
// Start RFID stuff
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() {
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
// 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
//memcpy(data, (const uint8_t[]){ 't', 'e', 'a', 'm', '3', '3', '8', '9', '.', 'i', 'n', 'f', 'o', 0, '1', '4' }, sizeof data);
//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:");
/* If the SD device is running the next line locks up the arduino after the first hex character is dumped
The data being read contains ...
74 65 61 6D 33 33 38 39 2E 69 6E 66 6F 00 31 34 team3389.info.14
*/
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)
{
// 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!?");
}
}
}
}
void readFile() {
// Open the file for reading:
myFile = SD.open("test.txt");
if (myFile) {
Serial.println("test.txt:");
// read from the file until there's nothing else in it:
while (myFile.available()) {
Serial.write(myFile.read());
}
// close the file:
myFile.close();
} else {
// if the file didn't open, print an error:
Serial.println("error opening test.txt");
}
}
void writeFile() {
// open the file. note that only one file can be open at a time,
// so you have to close this one before opening another.
myFile = SD.open("test.txt", FILE_WRITE);
// if the file opened okay, write to it:
if (myFile) {
Serial.print("Writing to test.txt...");
myFile.println("testing 1, 2, 3.");
// close the file:
myFile.close();
Serial.println("done.");
} else {
// if the file didn't open, print an error:
Serial.println("error opening test.txt");
}
return;
}
