card/eeprom/source/main.cpp

/*---------------------------------------------------------------------------------

    Simple eeprom example
    -- davr

---------------------------------------------------------------------------------*/
#include <nds.h>
#include <string.h>
#include <stdio.h>
#include <ctype.h>

//---------------------------------------------------------------------------------
void pause() {
//---------------------------------------------------------------------------------
    iprintf("Press start...\n");
    while(1) {
        scanKeys();
        if(keysDown() & KEY_START)
            break;
        swiWaitForVBlank();
    }
    scanKeys();
}

//---------------------------------------------------------------------------------
int main(void) {
//---------------------------------------------------------------------------------

    consoleDemoInit();

    iprintf("Reading cart info...\n");

    static u8 header1[512];
    static u8 header2[512];

    sysSetBusOwners(true, true); // give ARM9 access to the cart

    while(1) {
        // Read the header twice to verify.
        // If the card is being encrypted, we will get random junk
        cardReadHeader(header1);
        cardReadHeader(header2);

        // Make sure we got the same data twice
        while(memcmp(header1, header2, 32) != 0) {
            // If not, the card needs ejected and reinserted into the DS
            iprintf("Please eject & reinsert DS card.\n");
            pause();
            cardReadHeader(header1);
            cardReadHeader(header2);
        }

        // Add a null char right after the game title, so we can print it
        header1[32] = '\0';

        // Read some various info about the EEPROM
        int type = cardEepromGetType();
        int size = cardEepromGetSize();

        iprintf("Game ID: %s\n", header1);
        iprintf("EEPROM:\n");
        iprintf(" Type: %d\n", type);
        iprintf(" Size: %d\n", size);
        pause();

        // Read the first 512 bytes of EEPROM
        static u8 data[512];
        cardReadEeprom(0, data, 512, type);

        iprintf("First 160 bytes of EEPROM: \n");

        // Print 20 rows of 8 bytes each
        for(int y=0; y<20; y++) {

            // print 8 bytes as hex
            for(int x=0; x<8; x++) {
                iprintf("%02x ", data[y*8 + x]);
            }

            // print 8 bytes as characters
            for(int x=0; x<8; x++) {
                u8 c = data[y*8 + x];
                if(isprint(c)) // only display if it's a printable character
                    iprintf("%c", c);
                else
                    iprintf(".");
            }
        }

        iprintf("Insert a new card to read again\n");
        pause();
    }

    return 0;
}