mirror of
https://github.com/sanni/cartreader.git
synced 2024-11-10 23:15:08 +01:00
283 lines
6.7 KiB
C++
283 lines
6.7 KiB
C++
//******************************************
|
|
// SEGA MASTER SYSTEM MODULE
|
|
//******************************************
|
|
|
|
/******************************************
|
|
Variables
|
|
*****************************************/
|
|
|
|
/******************************************
|
|
Menu
|
|
*****************************************/
|
|
// MD menu items
|
|
static const char SMSMenuItem1[] PROGMEM = "Read Rom";
|
|
static const char SMSMenuItem2[] PROGMEM = "Reset";
|
|
static const char* const menuOptionsSMS[] PROGMEM = {SMSMenuItem1, SMSMenuItem2};
|
|
|
|
void smsMenu() {
|
|
// create menu with title and 2 options to choose from
|
|
unsigned char mainMenu;
|
|
// Copy menuOptions out of progmem
|
|
convertPgm(menuOptionsSMS, 2);
|
|
mainMenu = question_box(F("Sega Master System"), menuOptions, 2, 0);
|
|
|
|
// wait for user choice to come back from the question box menu
|
|
switch (mainMenu)
|
|
{
|
|
case 0:
|
|
display_Clear();
|
|
setup_SMS();
|
|
// Change working dir to root
|
|
sd.chdir("/");
|
|
readROM_SMS();
|
|
break;
|
|
|
|
case 1:
|
|
// Reset
|
|
asm volatile (" jmp 0");
|
|
break;
|
|
}
|
|
println_Msg(F(""));
|
|
println_Msg(F("Press Button..."));
|
|
display_Update();
|
|
wait();
|
|
}
|
|
|
|
/******************************************
|
|
Setup
|
|
*****************************************/
|
|
void setup_SMS() {
|
|
// Set Address Pins to Output
|
|
//A0-A7
|
|
DDRF = 0xFF;
|
|
//A8-A14
|
|
DDRK = 0xFF;
|
|
//A15
|
|
DDRH |= (1 << 3);
|
|
|
|
// Set Control Pins to Output RST(PH0) WR(PH5) OE(PH6)
|
|
DDRH |= (1 << 0) | (1 << 5) | (1 << 6);
|
|
// CE(PL1)
|
|
DDRL |= (1 << 1);
|
|
|
|
// Setting RST(PH0) WR(PH5) OE(PH6) HIGH
|
|
PORTH |= (1 << 0) | (1 << 5) | (1 << 6);
|
|
// CE(PL1)
|
|
PORTL |= (1 << 1);
|
|
|
|
// ROM has 16KB banks which can be mapped to one of three slots via register writes
|
|
// Register Slot Address space
|
|
// $fffd 0 $0000-$3fff
|
|
// $fffe 1 $4000-$7fff
|
|
// $ffff 2 $8000-$bfff
|
|
// Disable sram
|
|
writeByte_SMS(0xFFFC, 0);
|
|
// Map first 3 banks so we can read-out the header info
|
|
writeByte_SMS(0xFFFD, 0);
|
|
writeByte_SMS(0xFFFE, 1);
|
|
writeByte_SMS(0xFFFF, 2);
|
|
|
|
delay(400);
|
|
|
|
// Print all the info
|
|
getCartInfo_SMS();
|
|
}
|
|
|
|
/******************************************
|
|
Low level functions
|
|
*****************************************/
|
|
void writeByte_SMS(word myAddress, byte myData) {
|
|
// Set Data Pins (D0-D7) to Output
|
|
DDRC = 0xFF;
|
|
|
|
// Set address
|
|
PORTF = myAddress & 0xFF;
|
|
PORTK = (myAddress >> 8) & 0xFF;
|
|
PORTH = (PORTH & 0b11110111) | ((myAddress >> 12) & 0b00001000);
|
|
// Output data
|
|
PORTC = myData;
|
|
|
|
// Arduino running at 16Mhz -> one nop = 62.5ns
|
|
// Wait till output is stable
|
|
__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t");
|
|
|
|
// Switch CE(PL1) and WR(PH5) to LOW
|
|
PORTL &= ~(1 << 1);
|
|
PORTH &= ~(1 << 5);
|
|
|
|
// Leave WE low for at least 60ns
|
|
__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t");
|
|
|
|
// Switch CE(PL1) and WR(PH5) to HIGH
|
|
PORTH |= (1 << 5);
|
|
PORTL |= (1 << 1);
|
|
|
|
// Leave WE high for at least 50ns
|
|
__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t");
|
|
|
|
// Set Data Pins (D0-D7) to Input
|
|
DDRC = 0x00;
|
|
}
|
|
|
|
byte readByte_SMS(word myAddress) {
|
|
// Set Data Pins (D0-D7) to Input
|
|
DDRC = 0x00;
|
|
|
|
// Set Address
|
|
PORTF = myAddress & 0xFF;
|
|
PORTK = (myAddress >> 8) & 0xFF;
|
|
PORTH = (PORTH & 0b11110111) | ((myAddress >> 12) & 0b00001000);
|
|
|
|
__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t");
|
|
|
|
// Switch CE(PL1) and OE(PH6) to LOW
|
|
PORTL &= ~(1 << 1);
|
|
PORTH &= ~(1 << 6);
|
|
|
|
__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t");
|
|
|
|
// Read
|
|
byte tempByte = PINC;
|
|
|
|
// Switch CE(PL1) and OE(PH6) to HIGH
|
|
PORTH |= (1 << 6);
|
|
PORTL |= (1 << 1);
|
|
|
|
__asm__("nop\n\t""nop\n\t""nop\n\t""nop\n\t");
|
|
|
|
return tempByte;
|
|
}
|
|
|
|
//unsigned char hex2bcd (unsigned char x) {
|
|
// unsigned char y;
|
|
// y = (x / 10) << 4;
|
|
// y = y | (x % 10);
|
|
//return (y);
|
|
//}
|
|
|
|
byte readNibble(byte data, byte number) {
|
|
return ((data >> (number * 4)) & 0xf);
|
|
}
|
|
|
|
/******************************************
|
|
MASTER SYSTEM functions
|
|
*****************************************/
|
|
void getCartInfo_SMS() {
|
|
// Rom size
|
|
switch (readNibble(readByte_SMS(0x7fff), 0)) {
|
|
case 0xa:
|
|
// Adding UL gets rid of integer overflow compiler warning
|
|
cartSize = 8 * 1024UL;
|
|
break;
|
|
case 0xb:
|
|
cartSize = 16 * 1024UL;
|
|
break;
|
|
case 0xc:
|
|
cartSize = 32 * 1024UL;
|
|
break;
|
|
case 0xd:
|
|
cartSize = 48 * 1024UL;
|
|
break;
|
|
case 0xe:
|
|
cartSize = 64 * 1024UL;
|
|
break;
|
|
case 0xf:
|
|
cartSize = 128 * 1024UL;
|
|
break;
|
|
case 0x0:
|
|
cartSize = 256 * 1024UL;
|
|
break;
|
|
case 0x1:
|
|
cartSize = 512 * 1024UL;
|
|
break;
|
|
case 0x2:
|
|
cartSize = 512 * 1024UL;
|
|
break;
|
|
default:
|
|
cartSize = 48 * 1024UL;
|
|
// LED Error
|
|
rgb.setColor(0, 0, 255);
|
|
break;
|
|
|
|
}
|
|
|
|
// Read TMR Sega string
|
|
for (byte i = 0; i < 8; i++) {
|
|
romName[i] = char(readByte_SMS(0x7ff0 + i));
|
|
}
|
|
romName[8] = '\0';
|
|
|
|
display_Clear();
|
|
println_Msg(F("Cart Info"));
|
|
println_Msg(F(" "));
|
|
print_Msg(F("Name: "));
|
|
println_Msg(romName);
|
|
print_Msg(F("Size: "));
|
|
print_Msg(cartSize / 1024);
|
|
println_Msg(F("KB"));
|
|
println_Msg(F(" "));
|
|
|
|
if (strcmp(romName, "TMR SEGA") != 0) {
|
|
print_Error(F("Not working yet"), false);
|
|
sprintf(romName, "ERROR");
|
|
cartSize = 48 * 1024UL;
|
|
}
|
|
|
|
// Wait for user input
|
|
#ifdef enable_OLED
|
|
println_Msg(F("Press Button..."));
|
|
display_Update();
|
|
wait();
|
|
#endif
|
|
}
|
|
|
|
// Read rom and save to the SD card
|
|
void readROM_SMS() {
|
|
// Get name, add extension and convert to char array for sd lib
|
|
strcpy(fileName, romName);
|
|
strcat(fileName, ".SMS");
|
|
|
|
// create a new folder
|
|
EEPROM_readAnything(10, foldern);
|
|
sprintf(folder, "SMS/ROM/%s/%d", romName, foldern);
|
|
sd.mkdir(folder, true);
|
|
sd.chdir(folder);
|
|
|
|
display_Clear();
|
|
print_Msg(F("Saving to "));
|
|
print_Msg(folder);
|
|
println_Msg(F("/..."));
|
|
display_Update();
|
|
|
|
// write new folder number back to eeprom
|
|
foldern = foldern + 1;
|
|
EEPROM_writeAnything(10, foldern);
|
|
|
|
// Open file on sd card
|
|
if (!myFile.open(fileName, O_RDWR | O_CREAT)) {
|
|
print_Error(F("SD Error"), true);
|
|
}
|
|
word bankSize = 16 * 1024UL;
|
|
for (byte currBank = 0x0; currBank < (cartSize / bankSize); currBank++) {
|
|
// Write current 16KB bank to slot 2 register 0xFFFF
|
|
writeByte_SMS(0xFFFF, currBank);
|
|
|
|
// Blink led
|
|
PORTB ^= (1 << 4);
|
|
// Read 16KB from slot 2 which starts at 0x8000
|
|
for (word currBuffer = 0; currBuffer < bankSize; currBuffer += 512) {
|
|
// Fill SD buffer
|
|
for (int currByte = 0; currByte < 512; currByte++) {
|
|
sdBuffer[currByte] = readByte_SMS(0x8000 + currBuffer + currByte);
|
|
}
|
|
myFile.write(sdBuffer, 512);
|
|
}
|
|
}
|
|
// Close the file:
|
|
myFile.close();
|
|
}
|
|
|
|
//******************************************
|
|
// End of File
|
|
//******************************************
|