mirror of
https://github.com/sanni/cartreader.git
synced 2024-11-13 08:25:05 +01:00
283 lines
6.7 KiB
C++
283 lines
6.7 KiB
C++
//******************************************
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// SEGA MASTER SYSTEM MODULE
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//******************************************
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/******************************************
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Variables
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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 SMSMenuItem1[] PROGMEM = "Read Rom";
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static const char SMSMenuItem2[] PROGMEM = "Reset";
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static const char* const menuOptionsSMS[] PROGMEM = {SMSMenuItem1, SMSMenuItem2};
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void smsMenu() {
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// create menu with title and 2 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(menuOptionsSMS, 2);
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mainMenu = question_box(F("Sega Master System"), menuOptions, 2, 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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setup_SMS();
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// Change working dir to root
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sd.chdir("/");
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readROM_SMS();
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break;
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case 1:
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// Reset
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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_SMS() {
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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-A14
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DDRK = 0xFF;
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//A15
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DDRH |= (1 << 3);
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// Set Control Pins to Output RST(PH0) WR(PH5) OE(PH6)
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DDRH |= (1 << 0) | (1 << 5) | (1 << 6);
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// CE(PL1)
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DDRL |= (1 << 1);
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// Setting RST(PH0) WR(PH5) OE(PH6) HIGH
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PORTH |= (1 << 0) | (1 << 5) | (1 << 6);
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// CE(PL1)
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PORTL |= (1 << 1);
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// ROM has 16KB banks which can be mapped to one of three slots via register writes
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// Register Slot Address space
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// $fffd 0 $0000-$3fff
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// $fffe 1 $4000-$7fff
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// $ffff 2 $8000-$bfff
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// Disable sram
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writeByte_SMS(0xFFFC, 0);
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// Map first 3 banks so we can read-out the header info
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writeByte_SMS(0xFFFD, 0);
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writeByte_SMS(0xFFFE, 1);
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writeByte_SMS(0xFFFF, 2);
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delay(400);
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// Print all the info
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getCartInfo_SMS();
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}
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/******************************************
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Low level functions
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*****************************************/
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void writeByte_SMS(word myAddress, byte myData) {
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// Set Data Pins (D0-D7) to Output
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DDRC = 0xFF;
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// Set address
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PORTF = myAddress & 0xFF;
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PORTK = (myAddress >> 8) & 0xFF;
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PORTH = (PORTH & 0b11110111) | ((myAddress >> 12) & 0b00001000);
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// Output data
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PORTC = myData;
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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""nop\n\t""nop\n\t");
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// Switch CE(PL1) and WR(PH5) to LOW
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PORTL &= ~(1 << 1);
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PORTH &= ~(1 << 5);
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// Leave WE low for at least 60ns
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__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t");
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// Switch CE(PL1) and WR(PH5) to HIGH
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PORTH |= (1 << 5);
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PORTL |= (1 << 1);
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// Leave WE high for at least 50ns
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__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t");
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// Set Data Pins (D0-D7) to Input
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DDRC = 0x00;
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}
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byte readByte_SMS(word myAddress) {
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// Set Data Pins (D0-D7) to Input
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DDRC = 0x00;
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// Set Address
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PORTF = myAddress & 0xFF;
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PORTK = (myAddress >> 8) & 0xFF;
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PORTH = (PORTH & 0b11110111) | ((myAddress >> 12) & 0b00001000);
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__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t");
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// Switch CE(PL1) and OE(PH6) to LOW
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PORTL &= ~(1 << 1);
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PORTH &= ~(1 << 6);
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__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t");
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// Read
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byte tempByte = PINC;
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// Switch CE(PL1) and OE(PH6) to HIGH
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PORTH |= (1 << 6);
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PORTL |= (1 << 1);
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__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t");
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return tempByte;
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}
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//unsigned char hex2bcd (unsigned char x) {
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// unsigned char y;
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// y = (x / 10) << 4;
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// y = y | (x % 10);
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//return (y);
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//}
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byte readNibble(byte data, byte number) {
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return ((data >> (number * 4)) & 0xf);
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}
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/******************************************
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MASTER SYSTEM functions
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*****************************************/
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void getCartInfo_SMS() {
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// Rom size
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switch (readNibble(readByte_SMS(0x7fff), 0)) {
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case 0xa:
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// Adding UL gets rid of integer overflow compiler warning
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cartSize = 8 * 1024UL;
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break;
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case 0xb:
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cartSize = 16 * 1024UL;
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break;
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case 0xc:
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cartSize = 32 * 1024UL;
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break;
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case 0xd:
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cartSize = 48 * 1024UL;
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break;
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case 0xe:
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cartSize = 64 * 1024UL;
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break;
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case 0xf:
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cartSize = 128 * 1024UL;
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break;
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case 0x0:
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cartSize = 256 * 1024UL;
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break;
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case 0x1:
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cartSize = 512 * 1024UL;
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break;
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case 0x2:
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cartSize = 512 * 1024UL;
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break;
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default:
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cartSize = 48 * 1024UL;
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// LED Error
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rgb.setColor(0, 0, 255);
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break;
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}
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// Read TMR Sega string
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for (byte i = 0; i < 8; i++) {
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romName[i] = char(readByte_SMS(0x7ff0 + i));
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}
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romName[8] = '\0';
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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);
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println_Msg(F("KB"));
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println_Msg(F(" "));
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if (strcmp(romName, "TMR SEGA") != 0) {
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print_Error(F("Not working yet"), false);
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sprintf(romName, "ERROR");
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cartSize = 48 * 1024UL;
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}
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// Wait for user input
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#ifdef 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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#endif
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}
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// Read rom and save to the SD card
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void readROM_SMS() {
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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, ".SMS");
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// create a new folder
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EEPROM_readAnything(10, foldern);
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sprintf(folder, "SMS/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 bankSize = 16 * 1024UL;
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for (byte currBank = 0x0; currBank < (cartSize / bankSize); currBank++) {
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// Write current 16KB bank to slot 2 register 0xFFFF
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writeByte_SMS(0xFFFF, currBank);
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// Blink led
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PORTB ^= (1 << 4);
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// Read 16KB from slot 2 which starts at 0x8000
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for (word currBuffer = 0; currBuffer < bankSize; currBuffer += 512) {
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// Fill SD buffer
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for (int currByte = 0; currByte < 512; currByte++) {
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sdBuffer[currByte] = readByte_SMS(0x8000 + currBuffer + currByte);
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}
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myFile.write(sdBuffer, 512);
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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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//******************************************
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// End of File
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//******************************************
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