mirror of
https://github.com/sanni/cartreader.git
synced 2024-11-11 07:25:07 +01:00
488 lines
12 KiB
C++
488 lines
12 KiB
C++
//******************************************
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// SEGA MEGA DRIVE
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//******************************************
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/******************************************
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Variables
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*****************************************/
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unsigned long sramEnd;
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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, 3, 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 ((saveType == 1) || (saveType == 2)) {
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// Change working dir to root
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sd.chdir("/");
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println_Msg(F("Reading Sram..."));
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display_Update();
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enableSram_MD(1);
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readSram_MD();
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enableSram_MD(0);
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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 ((saveType == 1) || (saveType == 2)) {
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// Change working dir to root
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sd.chdir("/");
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// Launch file browser
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fileBrowser("Select srm file");
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display_Clear();
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enableSram_MD(1);
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writeSram_MD();
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writeErrors = verifySram_MD();
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enableSram_MD(0);
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if (writeErrors == 0) {
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println_Msg(F("Sram 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(writeErrors);
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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 RST(PH0) CS(PH3) WRH(PH4) WRL(PH5) OE(PH6)
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DDRH |= (1 << 3) | (1 << 4) | (1 << 5) | (1 << 6);
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// Set TIME(PJ0) to Output
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DDRJ |= (1 << 0);
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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 RST(PH0) CS(PH3) WRH(PH4) WRL(PH5) OE(PH6) HIGH
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PORTH |= (1 << 0) | (1 << 3) | (1 << 4) | (1 << 5) | (1 << 6);
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// Setting TIME(PJ0) HIGH
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PORTJ |= (1 << 0);
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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""nop\n\t");
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// Switch WR(PH5) to LOW
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PORTH &= ~(1 << 5);
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// Setting CS(PH3) LOW
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PORTH &= ~(1 << 3);
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// Leave WR low for at least 200ns
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__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t");
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// Setting CS(PH3) HIGH
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PORTH |= (1 << 3);
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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");
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// Setting CS(PH3) LOW
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PORTH &= ~(1 << 3);
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// Setting OE(PH6) LOW
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PORTH &= ~(1 << 6);
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// Long delay here or there will be read errors
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__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""nop\n\t""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 CS(PH3) HIGH
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PORTH |= (1 << 3);
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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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// Set control
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dataIn_MD();
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cartSize = ((long(readWord_MD(0xD2)) << 16) | readWord_MD(0xD3)) + 1;
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// Check if cart has sram
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if ((readWord_MD(0xD8) == 0x5241) && (readWord_MD(0xD9) == 0xF820)) {
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// Get sram start and end
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sramBase = ((long(readWord_MD(0xDA)) << 16) | readWord_MD(0xDB));
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sramEnd = ((long(readWord_MD(0xDC)) << 16) | readWord_MD(0xDD));
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// Check alignment of sram
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if (sramBase == 0x200001) {
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// low byte
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saveType = 1;
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sramSize = (sramEnd - sramBase + 2) / 2;
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// Right shift sram base address so [A21] is set to high 0x200000 = 0b001[0]00000000000000000000
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sramBase = sramBase >> 1;
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}
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else if (sramBase == 0x200000) {
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// high byte
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saveType = 2;
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sramSize = (sramEnd - sramBase + 1) / 2;
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// Right shift sram base address so [A21] is set to high 0x200000 = 0b001[0]00000000000000000000
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sramBase = sramBase / 2;
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}
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else
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print_Error(F("Unknown Sram Base"), true);
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}
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else {
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// Either no save or eeprom save
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saveType = 0;
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sramSize = 0;
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}
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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 * 8 / 1024 / 1024 );
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println_Msg(F(" MBit"));
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print_Msg(F("Sram: "));
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if (sramSize > 0) {
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print_Msg(sramSize * 8 / 1024);
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println_Msg(F(" KBit"));
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}
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else
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println_Msg(F("None"));
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println_Msg(F(" "));
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// Wait for user input
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if (enable_OLED) {
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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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// Set control
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dataIn_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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/******************************************
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SRAM functions
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*****************************************/
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// Sonic 3 sram enable
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void enableSram_MD(boolean enableSram) {
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dataOut_MD();
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// Set D0 to either 1(enable SRAM) or 0(enable ROM)
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PORTC = enableSram;
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// Strobe TIME(PJ0) LOW to latch the data
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PORTJ &= ~(1 << 0);
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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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// Set TIME(PJ0) HIGH
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PORTJ |= (1 << 0);
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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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dataIn_MD();
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}
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// Write sram to cartridge
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void writeSram_MD() {
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dataOut_MD();
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// Create filepath
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sprintf(filePath, "%s/%s", filePath, fileName);
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println_Msg(F("Writing..."));
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println_Msg(filePath);
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display_Update();
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// Open file on sd card
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if (myFile.open(filePath, O_READ)) {
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// Write to the lower byte
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if (saveType == 1) {
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for (unsigned long currByte = sramBase; currByte < sramBase + sramSize; currByte++) {
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writeWord_MD(currByte, (myFile.read() & 0xFF));
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}
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}
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// Write to the upper byte
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else if (saveType == 2) {
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for (unsigned long currByte = sramBase; currByte < sramBase + sramSize; currByte++) {
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writeWord_MD(currByte, ((myFile.read() << 8 ) & 0xFF));
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}
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}
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else
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print_Error(F("Unknown save type"), false);
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// Close the file:
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myFile.close();
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println_Msg(F("Done"));
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display_Update();
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}
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else {
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print_Error(F("SD Error"), true);
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}
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dataIn_MD();
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}
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// Read sram and save to the SD card
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void readSram_MD() {
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dataIn_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, ".srm");
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// create a new folder for the save file
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EEPROM_readAnything(10, foldern);
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sprintf(folder, "MD/SAVE/%s/%d", romName, foldern);
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sd.mkdir(folder, true);
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sd.chdir(folder);
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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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for (unsigned long currBuffer = sramBase; currBuffer < sramBase + sramSize; currBuffer += 512) {
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for (int currWord = 0; currWord < 512; currWord++) {
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word myWord = readWord_MD(currBuffer + currWord);
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if (saveType == 2) {
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// Only use the upper byte
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sdBuffer[currWord] = (( myWord >> 8 ) & 0xFF);
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}
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else if (saveType == 1) {
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// Only use the lower byte
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sdBuffer[currWord] = (myWord & 0xFF);
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}
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}
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myFile.write(sdBuffer, 512);
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}
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// Close the file:
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myFile.close();
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print_Msg(F("Saved 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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}
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unsigned long verifySram_MD() {
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dataIn_MD();
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writeErrors = 0;
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// Open file on sd card
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if (myFile.open(filePath, O_READ)) {
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for (unsigned long currBuffer = sramBase; currBuffer < sramBase + sramSize; currBuffer += 512) {
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for (int currWord = 0; currWord < 512; currWord++) {
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word myWord = readWord_MD(currBuffer + currWord);
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if (saveType == 2) {
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// Only use the upper byte
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sdBuffer[currWord] = (( myWord >> 8 ) & 0xFF);
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}
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else if (saveType == 1) {
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// Only use the lower byte
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sdBuffer[currWord] = (myWord & 0xFF);
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}
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}
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// Check sdBuffer content against file on sd card
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for (int i = 0; i < 512; i++) {
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if (myFile.read() != sdBuffer[i]) {
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writeErrors++;
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}
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}
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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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else {
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print_Error(F("SD Error"), true);
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}
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// Return 0 if verified ok, or number of errors
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return writeErrors;
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}
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