mirror of
https://github.com/sanni/cartreader.git
synced 2024-09-21 23:58:36 +02:00
80e0e12c82
Just dumping of roms right now, no save games. Not sure if all games will dump or if there are some special ones.
283 lines
6.9 KiB
C++
283 lines
6.9 KiB
C++
//******************************************
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// SEGA MEGA DRIVE
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//******************************************
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/******************************************
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Menu
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*****************************************/
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// MD menu items
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static const char MDMenuItem1[] PROGMEM = "Read Rom";
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static const char MDMenuItem2[] PROGMEM = "Read Save";
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static const char MDMenuItem3[] PROGMEM = "Write Save";
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static const char MDMenuItem4[] PROGMEM = "Write Flashcart";
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static const char MDMenuItem5[] PROGMEM = "Reset";
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static const char* const menuOptionsMD[] PROGMEM = {MDMenuItem1, MDMenuItem2, MDMenuItem3, MDMenuItem4, MDMenuItem5};
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void mdMenu() {
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// create menu with title and 5 options to choose from
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unsigned char mainMenu;
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// Copy menuOptions out of progmem
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convertPgm(menuOptionsMD, 5);
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mainMenu = question_box("MEGA DRIVE Reader", menuOptions, 1, 0);
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// wait for user choice to come back from the question box menu
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switch (mainMenu)
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{
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case 0:
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display_Clear();
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// Change working dir to root
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sd.chdir("/");
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readROM_MD();
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//compare_checksum_MD();
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break;
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/*case 1:
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display_Clear();
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// Does cartridge have SRAM
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if () {
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// Change working dir to root
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sd.chdir("/");
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readSRAM_MD();
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}
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else {
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print_Error(F("Cart has no Sram"), false);
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}
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break;
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case 2:
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display_Clear();
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// Does cartridge have SRAM
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if () {
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// Change working dir to root
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sd.chdir("/");
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writeSRAM_MD();
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unsigned long wrErrors;
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wrErrors = verifySRAM_MD();
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if (wrErrors == 0) {
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println_Msg(F("Verified OK"));
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display_Update();
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}
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else {
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print_Msg(F("Error: "));
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print_Msg(wrErrors);
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println_Msg(F(" bytes "));
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print_Error(F("did not verify."), false);
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}
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}
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else {
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print_Error(F("Cart has no Sram"), false);
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}
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break;
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case 3:
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// Change working dir to root
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sd.chdir("/");
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writeFlash_MD();
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// Reset
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wait();
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asm volatile (" jmp 0");
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break;
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case 4:
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asm volatile (" jmp 0");
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break;*/
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}
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println_Msg(F(""));
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println_Msg(F("Press Button..."));
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display_Update();
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wait();
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}
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/******************************************
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Setup
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*****************************************/
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void setup_MD() {
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// Set Address Pins to Output
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//A0-A7
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DDRF = 0xFF;
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//A8-A15
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DDRK = 0xFF;
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//A16-A23
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DDRL = 0xFF;
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// Set Control Pins to Output CS(PH3) WR(PH5) OE(PH6)
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DDRH |= (1 << 3) | (1 << 5) | (1 << 6);
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// Set Data Pins (D0-D15) to Input
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DDRC = 0x00;
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DDRA = 0x00;
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// Setting WR(PH5) OE(PH6) HIGH
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PORTH |= (1 << 5) | (1 << 6);
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// Setting CS(PH3) LOW
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PORTH &= ~(1 << 3);
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delay(200);
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// Print all the info
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getCartInfo_MD();
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}
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/******************************************
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I/O Functions
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*****************************************/
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/******************************************
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Low level functions
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*****************************************/
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void writeWord_MD(unsigned long myAddress, word myData) {
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PORTF = myAddress & 0xFF;
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PORTK = (myAddress >> 8) & 0xFF;
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PORTL = (myAddress >> 16) & 0xFF;
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PORTC = myData;
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PORTA = (myData >> 8) & 0xFF;
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// Arduino running at 16Mhz -> one nop = 62.5ns
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// Wait till output is stable
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__asm__("nop\n\t");
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// Switch WR(PH5) to LOW
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PORTH &= ~(1 << 5);
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// Leave WR low for at least 60ns
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__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t");
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// Switch WR(PH5) to HIGH
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PORTH |= (1 << 5);
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// Leave WR high for at least 50ns
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__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t");
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}
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word readWord_MD(unsigned long myAddress) {
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PORTF = myAddress & 0xFF;
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PORTK = (myAddress >> 8) & 0xFF;
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PORTL = (myAddress >> 16) & 0xFF;
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// Arduino running at 16Mhz -> one nop = 62.5ns
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__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t");
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// Setting OE(PH6) LOW
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PORTH &= ~(1 << 6);
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__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t");
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// Read
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word tempWord = ( ( PINA & 0xFF ) << 8 ) | ( PINC & 0xFF );
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// Setting OE(PH6) HIGH
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PORTH |= (1 << 6);
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__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t");
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return tempWord;
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}
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// Switch data pins to write
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void dataOut_MD() {
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DDRC = 0xFF;
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DDRA = 0xFF;
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}
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// Switch data pins to read
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void dataIn_MD() {
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DDRC = 0x00;
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DDRA = 0x00;
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}
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/******************************************
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MEGA DRIVE functions
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*****************************************/
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void getCartInfo_MD() {
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cartSize = ((long(readWord_MD(0xD2)) << 16) | readWord_MD(0xD3)) + 1;
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sramSize = ((long(readWord_MD(0xDC)) << 16) | readWord_MD(0xDD)) - ((long(readWord_MD(0xDA)) << 16) | readWord_MD(0xDB)) + 2;
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// Get name
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for (byte c = 0; c < 48; c += 2) {
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// split word
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word myWord = readWord_MD((0x150 + c) / 2);
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byte loByte = myWord & 0xFF;
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byte hiByte = myWord >> 8;
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// write to buffer
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sdBuffer[c] = hiByte;
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sdBuffer[c + 1] = loByte;
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}
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byte myLength = 0;
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for (unsigned int i = 0; i < 48; i++) {
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if (((char(sdBuffer[i]) >= 48 && char(sdBuffer[i]) <= 57) || (char(sdBuffer[i]) >= 65 && char(sdBuffer[i]) <= 122)) && myLength < 15) {
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romName[myLength] = char(sdBuffer[i]);
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myLength++;
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}
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}
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display_Clear();
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println_Msg(F("Cart Info"));
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println_Msg(F(" "));
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print_Msg(F("Name: "));
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println_Msg(romName);
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print_Msg(F("Size: "));
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print_Msg(cartSize / 1024 / 1024);
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println_Msg(F("MB"));
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print_Msg(F("Sram: "));
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print_Msg(sramSize / 1024);
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println_Msg(F("KB"));
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// Wait for user input
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if (enable_OLED) {
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println_Msg(F(" "));
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println_Msg(F("Press Button..."));
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display_Update();
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wait();
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}
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}
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// Read rom and save to the SD card
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void readROM_MD() {
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// Get name, add extension and convert to char array for sd lib
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strcpy(fileName, romName);
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strcat(fileName, ".MD");
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// create a new folder
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EEPROM_readAnything(10, foldern);
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sprintf(folder, "MD/ROM/%s/%d", romName, foldern);
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sd.mkdir(folder, true);
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sd.chdir(folder);
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display_Clear();
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print_Msg(F("Saving to "));
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print_Msg(folder);
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println_Msg(F("/..."));
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display_Update();
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// write new folder number back to eeprom
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foldern = foldern + 1;
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EEPROM_writeAnything(10, foldern);
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// Open file on sd card
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if (!myFile.open(fileName, O_RDWR | O_CREAT)) {
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print_Error(F("SD Error"), true);
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}
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word d = 0;
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for (unsigned long currBuffer = 0; currBuffer < cartSize / 2; currBuffer += 256) {
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// Blink led
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if (currBuffer % 16384 == 0)
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PORTB ^= (1 << 4);
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for (int currWord = 0; currWord < 256; currWord++) {
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word myWord = readWord_MD(currBuffer + currWord);
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// Split word into two bytes
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// Left
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sdBuffer[d] = (( myWord >> 8 ) & 0xFF);
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// Right
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sdBuffer[d + 1] = (myWord & 0xFF);
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d += 2;
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}
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myFile.write(sdBuffer, 512);
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d = 0;
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}
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// Close the file:
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myFile.close();
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}
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