(RFID project) SD problem with Ethernet library

hi everyone!

i'm doing rfid project using nfc pn532 (rfid reader) , arduino uno ethernet shield. is, when touch rfid card (i use mifare classic.) reader, data written mifare , micro sd card on ethernet shield.

my code here ... (my problem below code.)

code: [select]


#if defined(arduino) && arduino >= 100
#include <arduino.h>
#else
#include <wprogram.h>
#endif
#include <spi.h>
#include <ethernet.h>
#include <sd.h>
#include <nfc.h>
nfc_module nfc;

file myfile;

u8 buf[5], sta;

void setup()
{
 serial.begin(9600);
 pinmode(4, output);
 sd.begin(4);
 nfc.begin();

 uint32_t versiondata = nfc.get_version();
 if (!versiondata) {
   serial.println("didn't find pn53x board");
   delay(2000);
   asm volatile ("  jmp 0"); // reboot if didn't find pn53x board.
 }
 
 nfc.samconfiguration();
 serial.println("waiting card ...");
}

void loop()
{
 sta = nfc.inlistpassivetarget(buf);
 delay(200);
 if (sta && buf[0] == 4)
 {
   serial.println("connected.");
   readwritecard();
   writesd();
   serial.println("-----");
   delay(1000);
   serial.println("waiting card ...");
 }
}

boolean newcard(u8 block60[16]){
 int j = 0;
 for(int = 0; < 16; i++){
    if(block60[i] == 0){
       j++;
    }
 }
 if(j == 16){
   return true;
 } else{
   return false;
 }
}

void readwritecard(){
 serial.println("a card found!");
 serial.print("card id: ");
 nfc.puthex(buf, buf[0]);
 serial.println("");

 u8 keya[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 u8 rdata[16], wdata[16];
 u8 auth;
 nfc.mifareauthentication(0, 60, &buf[1], buf[0], keya);
 nfc.mifarereadblock(60, rdata);
 if(newcard(rdata)){
   serial.println("this new card.");
   memcpy(wdata, (u8[]){4,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}, sizeof wdata);
   nfc.mifarewriteblock(60, wdata);
 }
 nfc.mifarereadblock(60, rdata);
 int block = rdata[0];
 if((block + 1) % 4 == 0){
   block++;
 }
 auth = nfc.mifareauthentication(0, block, &buf[1], buf[0], keya);
 serial.print("authentication: ");
 serial.print("block "); serial.print(block); serial.print(" ");
 serial.println(auth);
 if(auth){
   memcpy(wdata, (u8[]){1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1}, sizeof wdata);
   nfc.mifarewriteblock(block, wdata);
   serial.print("card: "); nfc.puthex(wdata, 16); serial.println("");
   nfc.mifareauthentication(0, 60, &buf[1], buf[0], keya);
   memcpy(wdata, (u8[]){block+1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}, sizeof wdata);
   nfc.mifarewriteblock(60, wdata);
 } else{
   serial.println("authentication failed. block can't written.");
 }
}

void writesd(){
 myfile = sd.open("test.txt", file_write);
 if (myfile) {
   serial.print("writing test.txt...");
   myfile.println("testing 1, 2, 3.");
   myfile.close();
   serial.println("done.");
 } else {
   serial.println("error opening test.txt");
 }
 myfile = sd.open("test.txt");
 if (myfile) {
   serial.println("test.txt:");
   while (myfile.available()) {
    serial.write(myfile.read());
   }
   myfile.close();
 } else {
   serial.println("error opening test.txt");
 }
}


the line "myfile = sd.open("test.txt");" doesn't work well, serial monitor send "error opening test.txt". but if doesn't include ethernet library (ethernet.h), project works!!!!!!!

i don't know how ethernet.h make happened.   want much.  =( thank kind attention , help.  xd

*note : don't wonder why include ethernet.h without using it. project haven't done yet.

you have run out of sram. there easy solution. use mega 2560.

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