├── src └── disc_io │ ├── io_ezfo.h │ └── io_ezfo.c ├── .gitignore ├── README.md ├── examples └── fileio │ └── fileio.c └── LICENSE /src/disc_io/io_ezfo.h: -------------------------------------------------------------------------------- 1 | /* 2 | 3 | io_ezfo.h 4 | 5 | Hardware Routines for reading the EZ Flash Omega filesystem 6 | 7 | */ 8 | 9 | #ifndef __IO_EZFO_H__ 10 | #define __IO_EZFO_H__ 11 | 12 | // 'EZFO' 13 | #define DEVICE_TYPE_EZFO 0x4F465A45 14 | 15 | #include 16 | 17 | // Export interface 18 | extern const DISC_INTERFACE _io_ezfo; 19 | 20 | #endif // define __IO_EZFO_H__ 21 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | # Prerequisites 2 | *.d 3 | 4 | # Object files 5 | *.o 6 | *.ko 7 | *.obj 8 | *.elf 9 | 10 | # Linker output 11 | *.ilk 12 | *.map 13 | *.exp 14 | 15 | # Precompiled Headers 16 | *.gch 17 | *.pch 18 | 19 | # Libraries 20 | *.lib 21 | *.a 22 | *.la 23 | *.lo 24 | 25 | # Shared objects (inc. Windows DLLs) 26 | *.dll 27 | *.so 28 | *.so.* 29 | *.dylib 30 | 31 | # Executables 32 | *.exe 33 | *.out 34 | *.app 35 | *.i*86 36 | *.x86_64 37 | *.hex 38 | 39 | # Debug files 40 | *.dSYM/ 41 | *.su 42 | *.idb 43 | *.pdb 44 | 45 | # Kernel Module Compile Results 46 | *.mod* 47 | *.cmd 48 | .tmp_versions/ 49 | modules.order 50 | Module.symvers 51 | Mkfile.old 52 | dkms.conf 53 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # ezfo-disc_io 2 | libfat Gameboy Advance Disc Interface for EZ Flash Omega flash cartridge 3 | 4 | # Usage # 5 | 6 | Compile io_ezfo.c and include io_ezfo.h in your FAT initialisation. 7 | 8 | The EZ Flash Omega SD can be mounted with libfat using: 9 | ```c 10 | const bool ismount = fatMountSimple( "fat", &_io_ezfo ); // _io_ezfo from io_ezfo.h 11 | if ( ismount ) { 12 | const int cderr = chdir( "fat:/" ); // Change working directory to fat:/ device 13 | if ( cderr == 0 ) { 14 | // Mount success 15 | } else { 16 | // Change directory fail 17 | } 18 | } else { 19 | // Mount fail 20 | } 21 | ``` 22 | 23 | fatInitDefault can still be used to keep compatibility with other flash-carts: 24 | ```c 25 | if ( fatInitDefault() || ( fatMountSimple( "fat", &_io_ezfo ) && chdir( "fat:/" ) == 0 ) ) { 26 | // Mount success 27 | } else { 28 | // Mount fail 29 | } 30 | ``` 31 | 32 | # Known issues # 33 | 34 | ## PSRAM only ## 35 | 36 | For now, only ROMs copies to EZ Flash Omega's PSRAM are supported. NOR ROMs definitely can work, however there is a lot of complexity involved with switching back to NOR game mode from OS kernel mode related to detecting ROM binaries. 37 | 38 | When a better method for retrieving a game's NOR page is discovered this issue can be easily solved. 39 | 40 | ## Code is copied to EWRAM ## 41 | 42 | Switching to OS kernel mode changes the contents of the ROM, so it cannot be used with the memory map. This means execution of EZ Flash Omega FAT read/write must happen in memory, not in ROM. 43 | 44 | This is not ideal as it means some of your EWRAM will be taken up by EZFO disc_io, even for other flash carts. 45 | 46 | The solution to this is to pre-compile the read/write routines as a binary and copy that binary from ROM into memory when it is needed (and then free it after). 47 | 48 | ## Working directory is not binary's location on disk ## 49 | 50 | This is a general problem with flash carts and homebrew. Not much can be done about this, unless flash carts start exposing the executable path. 51 | 52 | Means everything generally must be done at the root of the filesystem. -------------------------------------------------------------------------------- /examples/fileio/fileio.c: -------------------------------------------------------------------------------- 1 | /* 2 | 3 | fileio.c 4 | 5 | Example libfat & ezfo-disc_io Gameboy Advance file handling 6 | 7 | */ 8 | 9 | #include 10 | #include 11 | 12 | #include // iprintf, fopen, fwrite, fclose 13 | #include // chdir 14 | 15 | // EZ Flash Omega disc interface 16 | #include "io_ezfo.h" 17 | 18 | // EZ Flash Omega mounts an SD card 19 | #define EZFO_DEVNAME "sd" 20 | 21 | #define DEMO_FILENAME "fileio_demo.txt" 22 | 23 | #define EVER 24 | 25 | /** 26 | * Locks device into loop 27 | */ 28 | static void waitForever() { 29 | for ( EVER ) { 30 | VBlankIntrWait(); 31 | } 32 | } 33 | 34 | /** 35 | * Mounts EZ Flash Omega SD 36 | * or uses whatever fatsystem libgba might be available 37 | */ 38 | static bool initFatSystem() { 39 | const char * devname; 40 | 41 | // Attempt to mount EZFO and change working directory into device 42 | if ( fatMountSimple( EZFO_DEVNAME, &_io_ezfo ) && chdir( EZFO_DEVNAME ":/" ) == 0 ) { 43 | devname = EZFO_DEVNAME; 44 | } else if ( fatInitDefault() ) { 45 | devname = "fat"; 46 | } else { 47 | devname = NULL; 48 | } 49 | 50 | if ( !devname ) { 51 | iprintf( "[FAIL] Failed to mount or init a FAT device.\n" ); 52 | return false; 53 | } 54 | 55 | iprintf( "[ OK ] Mounted dev %s.\n", devname ); 56 | return true; 57 | } 58 | 59 | /** 60 | * Program entry 61 | */ 62 | int main() { 63 | FILE * file; 64 | u32 value; // Number in the example file 65 | 66 | irqInit(); 67 | irqEnable( IRQ_VBLANK ); // Enable IRQ_VBLANK for VBlankIntrWait 68 | 69 | // libgba console 70 | consoleDemoInit(); 71 | 72 | iprintf( "Welcome to GBA file IO demo!\n\n" ); 73 | 74 | if ( !initFatSystem() ) { 75 | waitForever(); 76 | } 77 | 78 | file = fopen( DEMO_FILENAME, "r" ); 79 | if ( file ) { 80 | fscanf( file, "%ld", &value ); 81 | fclose( file ); 82 | 83 | iprintf( "[ OK ] Opened " DEMO_FILENAME " (%ld).\n", value ); 84 | 85 | value++; // Increment reads 86 | } else { 87 | iprintf( "[FAIL] " DEMO_FILENAME " does not exist.\n" ); 88 | 89 | value = 1; // First read 90 | } 91 | 92 | file = fopen( DEMO_FILENAME, "w" ); 93 | if ( !file ) { 94 | iprintf( "[FAIL] " DEMO_FILENAME " could not be created.\n" ); 95 | waitForever(); 96 | } 97 | 98 | if ( fprintf( file, "%ld", value ) ) { 99 | iprintf( "[ OK ] Wrote %ld.\n", value ); 100 | } else { 101 | iprintf( "[FAIL] Write failure.\n" ); 102 | } 103 | fclose( file ); 104 | 105 | iprintf( "[ OK ] File saved.\n" ); 106 | waitForever(); 107 | } 108 | -------------------------------------------------------------------------------- /src/disc_io/io_ezfo.c: -------------------------------------------------------------------------------- 1 | /* 2 | 3 | io_ezfo.c 4 | 5 | Hardware Routines for reading the EZ Flash Omega filesystem 6 | 7 | */ 8 | 9 | #include "io_ezfo.h" 10 | 11 | #include 12 | 13 | #define OMEGA_ROM_UNKNOWN ( 0x0000 ) 14 | #define OMEGA_ROM_PSRAM ( 0x9780 ) 15 | #define OMEGA_ROM_NOR ( 0xFFFF ) 16 | 17 | #define OMEGA_ROM_PAGE_UNKNOWN ( 0xFFFF ) 18 | #define OMEGA_ROM_PAGE_PSRAM ( 0x0200 ) 19 | #define OMEGA_ROM_PAGE_KERNEL ( 0x8000 ) 20 | 21 | #define OMEGA_SD_BIT_ENABLE ( 0x1 << 0 ) 22 | #define OMEGA_SD_BIT_READ_STATE ( 0x1 << 1 ) 23 | 24 | #define OMEGA_SD_CTL_ENABLE ( OMEGA_SD_BIT_ENABLE ) 25 | #define OMEGA_SD_CTL_READ_STATE ( OMEGA_SD_BIT_ENABLE | OMEGA_SD_BIT_READ_STATE ) 26 | #define OMEGA_SD_CTL_DISABLE ( 0x0 ) 27 | 28 | /** 29 | * 30 | * Miscellaneous utility functions 31 | * 32 | */ 33 | 34 | static inline void _Spin( u32 _cycles ) { 35 | while ( _cycles-- ) { 36 | asm ( 37 | "nop" 38 | ); 39 | } 40 | } 41 | 42 | /** 43 | * 44 | * Omega device functions 45 | * 46 | */ 47 | 48 | static inline void _Omega_SetROMPage( const u16 _page ) { 49 | *( vu16 * )0x9fe0000 = 0xd200; 50 | *( vu16 * )0x8000000 = 0x1500; 51 | *( vu16 * )0x8020000 = 0xd200; 52 | *( vu16 * )0x8040000 = 0x1500; 53 | *( vu16 * )0x9880000 = _page; 54 | *( vu16 * )0x9fc0000 = 0x1500; 55 | } 56 | 57 | static inline void _Omega_SetSDControl( const u16 _control ) { 58 | *( vu16 * )0x9fe0000 = 0xd200; 59 | *( vu16 * )0x8000000 = 0x1500; 60 | *( vu16 * )0x8020000 = 0xd200; 61 | *( vu16 * )0x8040000 = 0x1500; 62 | *( vu16 * )0x9400000 = _control; 63 | *( vu16 * )0x9fc0000 = 0x1500; 64 | } 65 | 66 | static inline u32 _Omega_WaitSDResponse() { 67 | vu16 respose; 68 | u32 waitSpin = 0; 69 | while ( waitSpin < 0x100000 ) { 70 | respose = *( vu16 * )0x9E00000; 71 | if ( respose != 0xEEE1 ) { 72 | return 0; 73 | } 74 | waitSpin += 1; 75 | } 76 | return 1; 77 | } 78 | 79 | /** 80 | * 81 | * Disc interface functions 82 | * 83 | */ 84 | 85 | bool _EZFO_startUp() { 86 | return *( vu16 * )0x9fe0000 == OMEGA_ROM_PSRAM; 87 | } 88 | 89 | bool _EZFO_isInserted() { 90 | return true; 91 | } 92 | 93 | bool EWRAM_CODE _EZFO_readSectors( u32 _address, u32 _count, void * _buffer ) { 94 | _Omega_SetROMPage( 0x8000 ); // Change to OS mode 95 | 96 | _Omega_SetSDControl( OMEGA_SD_CTL_ENABLE ); 97 | 98 | u32 readsRemain = 2; 99 | for ( u16 ii = 0; ii < _count; ii += 4 ) { 100 | const u16 blocks = ( _count - ii > 4 ) ? 4 : ( _count - ii ); 101 | 102 | while ( readsRemain ) { 103 | *( vu16 * )0x9fe0000 = 0xd200; 104 | *( vu16 * )0x8000000 = 0x1500; 105 | *( vu16 * )0x8020000 = 0xd200; 106 | *( vu16 * )0x8040000 = 0x1500; 107 | *( vu16 * )0x9600000 = ( ( _address + ii ) & 0x0000FFFF); 108 | *( vu16 * )0x9620000 = ( ( _address + ii ) & 0xFFFF0000) >> 16; 109 | *( vu16 * )0x9640000 = blocks; 110 | *( vu16 * )0x9fc0000 = 0x1500; 111 | 112 | _Omega_SetSDControl( OMEGA_SD_CTL_READ_STATE ); 113 | const u32 response = _Omega_WaitSDResponse(); 114 | _Omega_SetSDControl( OMEGA_SD_CTL_ENABLE ); 115 | if ( response && --readsRemain ) { 116 | _Spin( 5000 ); 117 | } else { 118 | dmaCopy( ( void * )0x9E00000, ( void * )( _buffer + ii * 512 ), blocks * 512 ); 119 | break; 120 | } 121 | } 122 | } 123 | 124 | _Omega_SetSDControl( OMEGA_SD_CTL_DISABLE ); 125 | 126 | _Omega_SetROMPage( 0x200 ); // Return to original mode 127 | return true; 128 | } 129 | 130 | bool EWRAM_CODE _EZFO_writeSectors( u32 _address, u32 _count, const void * _buffer ) { 131 | _Omega_SetROMPage( 0x8000 ); // Change to OS mode 132 | 133 | _Omega_SetSDControl( OMEGA_SD_CTL_READ_STATE ); 134 | for ( u16 ii = 0; ii < _count; ii++ ) { 135 | const u16 blocks = ( _count - ii > 4 ) ? 4 : ( _count - ii ); 136 | 137 | dmaCopy( _buffer + ii * 512, ( void * )0x9E00000, blocks * 512 ); 138 | *( vu16 * )0x9fe0000 = 0xd200; 139 | *( vu16 * )0x8000000 = 0x1500; 140 | *( vu16 * )0x8020000 = 0xd200; 141 | *( vu16 * )0x8040000 = 0x1500; 142 | *( vu16 * )0x9600000 = ( ( _address + ii ) & 0x0000FFFF ); 143 | *( vu16 * )0x9620000 = ( ( _address +ii ) & 0xFFFF0000 ) >> 16; 144 | *( vu16 * )0x9640000 = 0x8000 + blocks; 145 | *( vu16 * )0x9fc0000 = 0x1500; 146 | 147 | _Omega_WaitSDResponse(); 148 | } 149 | 150 | _Spin( 3000 ); 151 | 152 | _Omega_SetSDControl( OMEGA_SD_CTL_DISABLE ); 153 | 154 | _Omega_SetROMPage( 0x200 ); // Return to original mode 155 | return true; 156 | } 157 | 158 | bool _EZFO_clearStatus() { 159 | return true; 160 | } 161 | 162 | bool _EZFO_shutdown() { 163 | return true; 164 | } 165 | 166 | const DISC_INTERFACE _io_ezfo = { 167 | DEVICE_TYPE_EZFO, 168 | FEATURE_MEDIUM_CANREAD | FEATURE_MEDIUM_CANWRITE | FEATURE_SLOT_GBA, 169 | ( FN_MEDIUM_STARTUP )&_EZFO_startUp, 170 | ( FN_MEDIUM_ISINSERTED )&_EZFO_isInserted, 171 | ( FN_MEDIUM_READSECTORS )&_EZFO_readSectors, 172 | ( FN_MEDIUM_WRITESECTORS )&_EZFO_writeSectors, 173 | ( FN_MEDIUM_CLEARSTATUS )&_EZFO_clearStatus, 174 | ( FN_MEDIUM_SHUTDOWN )&_EZFO_shutdown 175 | }; 176 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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