/
SNES.ino
2251 lines (2032 loc) · 63.3 KB
/
SNES.ino
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//******************************************
// SUPER NINTENDO MODULE
//******************************************
#ifdef ENABLE_SNES
/******************************************
Defines
*****************************************/
// SNES Hi and LoRom, SA is HI with different Sram dumping
#define EX 4
#define SA 3
#define HI 1
#define LO 0
/******************************************
Variables
*****************************************/
// Define SNES Cart Reader Variables
int romSpeed = 0; // 0 = SlowROM, 3 = FastROM
int romChips = 0; // 0 = ROM only, 1 = ROM & RAM, 2 = ROM & Save RAM, 3 = ROM & DSP1, 4 = ROM & RAM & DSP1, 5 = ROM & Save RAM & DSP1, 19 = ROM & SFX
// 227 = ROM & RAM & GameBoy data, 243 = CX4, 246 = ROM & DSP2
byte romSizeExp = 0; // ROM-Size Exponent
boolean NP = false;
byte cx4Type = 0;
byte cx4Map = 0;
boolean altconf = 0;
/******************************************
Menu
*****************************************/
// SNES/Nintendo Power SF Memory start menu
static const char snsMenuItem1[] PROGMEM = "SNES/SFC cartridge";
static const char snsMenuItem2[] PROGMEM = "SF Memory Cassette";
static const char snsMenuItem3[] PROGMEM = "Satellaview BS-X";
static const char snsMenuItem4[] PROGMEM = "Sufami Turbo";
static const char snsMenuItem5[] PROGMEM = "Game Processor RAM";
static const char snsMenuItem6[] PROGMEM = "Flash repro";
#ifdef OPTION_CLOCKGEN_CALIBRATION
static const char snsMenuItem7[] PROGMEM = "Calibrate Clock";
static const char* const menuOptionsSNS[] PROGMEM = { snsMenuItem1, snsMenuItem2, snsMenuItem3, snsMenuItem4, snsMenuItem5, snsMenuItem6, snsMenuItem7, FSTRING_RESET };
#else
static const char* const menuOptionsSNS[] PROGMEM = { snsMenuItem1, snsMenuItem2, snsMenuItem3, snsMenuItem4, snsMenuItem5, snsMenuItem6, FSTRING_RESET };
#endif
// SNES menu items
static const char SnesMenuItem4[] PROGMEM = "Test SRAM";
static const char SnesMenuItem6[] PROGMEM = "Force cart type";
static const char* const menuOptionsSNES[] PROGMEM = { FSTRING_READ_ROM, FSTRING_READ_SAVE, FSTRING_WRITE_SAVE, SnesMenuItem4, FSTRING_REFRESH_CART, SnesMenuItem6, FSTRING_RESET };
// Manual config menu items
static const char confMenuItem1[] PROGMEM = "Use header info";
static const char confMenuItem2[] PROGMEM = "4MB LoROM 256K SRAM";
static const char confMenuItem3[] PROGMEM = "4MB HiROM 64K SRAM";
static const char confMenuItem4[] PROGMEM = "6MB ExROM 256K SRAM";
static const char* const menuOptionsConfManual[] PROGMEM = { confMenuItem1, confMenuItem2, confMenuItem3, confMenuItem4, FSTRING_RESET };
// Repro menu items
static const char reproMenuItem1[] PROGMEM = "LoROM (P0)";
static const char reproMenuItem2[] PROGMEM = "HiROM (P0)";
static const char reproMenuItem3[] PROGMEM = "ExLoROM (P1)";
static const char reproMenuItem4[] PROGMEM = "ExHiROM (P1)";
static const char* const menuOptionsRepro[] PROGMEM = { reproMenuItem1, reproMenuItem2, reproMenuItem3, reproMenuItem4, FSTRING_RESET };
// SNES repro menu
void reproMenu() {
// create menu with title and 6 options to choose from
unsigned char snsRepro;
// Copy menuOptions out of progmem
convertPgm(menuOptionsRepro, 5);
snsRepro = question_box(F("Select Repro Type"), menuOptions, 5, 0);
// wait for user choice to come back from the question box menu
switch (snsRepro) {
#ifdef ENABLE_FLASH
case 0:
// LoRom
display_Clear();
display_Update();
mapping = 0;
setup_Flash8();
id_Flash8();
wait();
mode = CORE_FLASH8;
break;
case 1:
// HiRom
display_Clear();
display_Update();
mapping = 1;
setup_Flash8();
id_Flash8();
wait();
mode = CORE_FLASH8;
break;
case 2:
// ExLoRom
display_Clear();
display_Update();
mapping = 2;
setup_Flash8();
id_Flash8();
wait();
mode = CORE_FLASH8;
break;
case 3:
// ExHiRom
display_Clear();
display_Update();
mapping = 3;
setup_Flash8();
id_Flash8();
wait();
mode = CORE_FLASH8;
break;
#endif
case 4:
resetArduino();
break;
}
}
// SNES start menu
void snsMenu() {
// create menu with title and 7 options to choose from
unsigned char snsCart;
// Copy menuOptions out of progmem
#ifdef OPTION_CLOCKGEN_CALIBRATION
convertPgm(menuOptionsSNS, 8);
snsCart = question_box(FS(FSTRING_SELECT_CART_TYPE), menuOptions, 8, 0);
#else
convertPgm(menuOptionsSNS, 7);
snsCart = question_box(FS(FSTRING_SELECT_CART_TYPE), menuOptions, 7, 0);
#endif
// wait for user choice to come back from the question box menu
switch (snsCart) {
case 0:
display_Clear();
display_Update();
setup_Snes();
mode = CORE_SNES;
break;
#ifdef ENABLE_SFM
case 1:
display_Clear();
display_Update();
setup_SFM();
mode = CORE_SFM;
break;
#endif
#ifdef ENABLE_SV
case 2:
display_Clear();
display_Update();
setup_SV();
mode = CORE_SV;
break;
#endif
#ifdef ENABLE_ST
case 3:
display_Clear();
display_Update();
setup_ST();
mode = CORE_ST;
break;
#endif
#ifdef ENABLE_GPC
case 4:
display_Clear();
display_Update();
setup_GPC();
mode = CORE_GPC;
break;
#endif
#ifdef ENABLE_FLASH
case 5:
setup_FlashVoltage();
reproMenu();
break;
#endif
case 6:
#ifdef OPTION_CLOCKGEN_CALIBRATION
clkcal();
break;
case 7:
#endif
resetArduino();
break;
default:
print_MissingModule(); // does not return
}
}
// SNES Menu
void snesMenu() {
// create menu with title and 7 options to choose from
unsigned char mainMenu;
// Copy menuOptions out of progmem
convertPgm(menuOptionsSNES, 7);
mainMenu = question_box(F("SNES Cart Reader"), menuOptions, 7, 0);
// wait for user choice to come back from the question box menu
switch (mainMenu) {
case 0:
{
if (numBanks > 0) {
display_Clear();
// Change working dir to root
sd.chdir("/");
// start reading from cart
readROM_SNES();
// Internal Checksum
compare_checksum();
// CRC32
compareCRC("snes.txt", 0, 1, 0);
#ifdef ENABLE_GLOBAL_LOG
save_log();
#endif
display_Update();
} else {
display_Clear();
print_Error(F("Does not have ROM"));
}
}
break;
case 1:
if (sramSize > 0) {
display_Clear();
// Change working dir to root
sd.chdir("/");
readSRAM();
} else {
display_Clear();
print_Error(F("Does not have SRAM"));
}
break;
case 2:
if (sramSize > 0) {
display_Clear();
// Change working dir to root
sd.chdir("/");
writeSRAM(1);
unsigned long wrErrors;
wrErrors = verifySRAM();
if (wrErrors == 0) {
println_Msg(F("Verified OK"));
display_Update();
} else {
print_STR(error_STR, 0);
print_Msg(wrErrors);
print_STR(_bytes_STR, 1);
print_Error(did_not_verify_STR);
}
} else {
display_Clear();
print_Error(F("Does not have SRAM"));
}
break;
case 3:
if (sramSize > 0) {
display_Clear();
println_Msg(F("Warning:"));
println_Msg(F("This can erase"));
println_Msg(F("your save games"));
println_Msg(FS(FSTRING_EMPTY));
println_Msg(FS(FSTRING_EMPTY));
println_Msg(F("Press any button to"));
println_Msg(F("start sram testing"));
display_Update();
wait();
display_Clear();
// Change working dir to root
sd.chdir("/");
readSRAM();
eraseSRAM(0x00);
eraseSRAM(0xFF);
writeSRAM(0);
unsigned long wrErrors = verifySRAM();
if (wrErrors == 0) {
println_Msg(F("Restored OK"));
display_Update();
} else {
print_STR(error_STR, 0);
print_Msg(wrErrors);
print_STR(_bytes_STR, 1);
print_Error(did_not_verify_STR);
}
} else {
display_Clear();
print_Error(F("Does not have SRAM"));
}
break;
case 4:
// For arcademaster1 (Markfrizb) multi-game carts
// Set reset pin to output (PH0)
DDRH |= (1 << 0);
// Switch RST(PH0) to LOW
PORTH &= ~(1 << 0);
// Note: It is probably not intended to reset CIC or clocks here
// But if that's false, uncomment this:
// stopSnesClocks_resetCic_resetCart();
display_Clear();
print_Msg(F("Resetting..."));
display_Update();
delay(3000); // wait 3 secs to switch to next game
resetArduino();
break;
case 5:
confMenuManual();
display_Clear();
display_Update();
break;
case 6:
stopSnesClocks_resetCic_resetCart();
resetArduino();
break;
}
//println_Msg(FS(FSTRING_EMPTY));
// Prints string out of the common strings array either with or without newline
print_STR(press_button_STR, 1);
display_Update();
wait();
}
// Menu for manual configuration
void confMenuManual() {
// create menu with title and 5 options to choose from
unsigned char subMenu;
// Copy menuOptions out of progmem
convertPgm(menuOptionsConfManual, 5);
subMenu = question_box(F("Choose mapping"), menuOptions, 5, 0);
// wait for user choice to come back from the question box menu
switch (subMenu) {
case 0:
break;
case 1:
romType = LO;
numBanks = 128;
sramSize = 256;
strcpy(romName, "LoROM");
break;
case 2:
romType = HI;
numBanks = 64;
sramSize = 64;
strcpy(romName, "HiROM");
break;
case 3:
romType = EX;
numBanks = 96;
sramSize = 256;
strcpy(romName, "ExROM");
break;
case 4:
// Reset
stopSnesClocks_resetCic_resetCart();
resetArduino();
break;
}
}
void stopSnesClocks_resetCic_resetCart() {
DDRG |= (1 << 1); // Set cicrstPin(PG1) to Output
PORTG |= (1 << 1); // pull high = reset CIC
DDRH |= (1 << 0); // Set RST(PH0) pin to Output
PORTH &= ~(1 << 0); // Switch RST(PH0) to LOW
if (i2c_found) {
clockgen.output_enable(SI5351_CLK1, 0); // CPU clock
clockgen.output_enable(SI5351_CLK2, 0); // CIC clock
clockgen.output_enable(SI5351_CLK0, 0); // master clock
}
}
/******************************************
Setup
*****************************************/
void setup_Snes() {
// Request 5V
setVoltage(VOLTS_SET_5V);
// Set cicrstPin(PG1) to Output
DDRG |= (1 << 1);
// Output a high signal until we're ready to start
PORTG |= (1 << 1);
// Set cichstPin(PG0) to Input
DDRG &= ~(1 << 0);
// Set Address Pins to Output
//A0-A7
DDRF = 0xFF;
//A8-A15
DDRK = 0xFF;
//BA0-BA7
DDRL = 0xFF;
//PA0-PA7
DDRA = 0xFF;
// Set Control Pins to Output RST(PH0) CS(PH3) WR(PH5) RD(PH6)
DDRH |= (1 << 0) | (1 << 3) | (1 << 5) | (1 << 6);
// Switch RST(PH0) and WR(PH5) to HIGH
PORTH |= (1 << 0) | (1 << 5);
// Switch CS(PH3) and RD(PH6) to LOW
PORTH &= ~((1 << 3) | (1 << 6));
// Set Refresh(PE5) to Output
DDRE |= (1 << 5);
// Switch Refresh(PE5) to LOW (needed for SA-1)
PORTE &= ~(1 << 5);
// Set CPU Clock(PH1) to Output
DDRH |= (1 << 1);
//PORTH &= ~(1 << 1);
// Set IRQ(PH4) to Input
DDRH &= ~(1 << 4);
// Activate Internal Pullup Resistors
//PORTH |= (1 << 4);
// Set expand(PG5) to Input
DDRG &= ~(1 << 5);
// Activate Internal Pullup Resistors
//PORTG |= (1 << 5);
// Set Data Pins (D0-D7) to Input
DDRC = 0x00;
// Enable Internal Pullups
//PORTC = 0xFF;
// Unused pins
// Set wram(PE4) to Output
DDRE |= (1 << 4);
//PORTE &= ~(1 << 4);
// Set pawr(PJ1) to Output
DDRJ |= (1 << 1);
//PORTJ &= ~(1 << 1);
// Set pard(PJ0) to Output
DDRJ |= (1 << 0);
//PORTJ &= ~(1 << 0);
// Adafruit Clock Generator
initializeClockOffset();
if (i2c_found) {
// Set clocks to 4Mhz/1Mhz for better SA-1 unlocking
clockgen.set_freq(100000000ULL, SI5351_CLK1); // CPU
clockgen.set_freq(100000000ULL, SI5351_CLK2); // CIC
clockgen.set_freq(400000000ULL, SI5351_CLK0); // EXT
// Start outputting master clock, CIC clock
clockgen.output_enable(SI5351_CLK1, 0); // no CPU clock yet; seems to affect SA-1 success a lot
clockgen.output_enable(SI5351_CLK2, 1); // CIC clock (should go before master clock)
clockgen.output_enable(SI5351_CLK0, 1); // master clock
// Wait for clock generator
clockgen.update_status();
delay(500);
}
#ifdef ENABLE_CLOCKGEN
else {
display_Clear();
print_FatalError(F("Clock Generator not found"));
}
#endif
// Start CIC by outputting a low signal to cicrstPin(PG1)
PORTG &= ~(1 << 1);
// Wait for CIC reset
delay(500);
// Print all the info
getCartInfo_SNES();
if (i2c_found) {
//Set clocks to standard or else SA-1 sram writing will fail
clockgen.set_freq(2147727200ULL, SI5351_CLK0);
clockgen.set_freq(357954500ULL, SI5351_CLK1);
clockgen.set_freq(307200000ULL, SI5351_CLK2);
}
}
/******************************************
I/O Functions
*****************************************/
// Switch control pins to write
void controlOut_SNES() {
// Switch RD(PH6) and WR(PH5) to HIGH
PORTH |= (1 << 6) | (1 << 5);
// Switch CS(PH3) to LOW
PORTH &= ~(1 << 3);
}
// Switch control pins to read
void controlIn_SNES() {
// Switch WR(PH5) to HIGH
PORTH |= (1 << 5);
// Switch CS(PH3) and RD(PH6) to LOW
PORTH &= ~((1 << 3) | (1 << 6));
}
/******************************************
Low level functions
*****************************************/
// Write one byte of data to a location specified by bank and address, 00:0000
void writeBank_SNES(byte myBank, word myAddress, byte myData) {
PORTL = myBank;
PORTF = myAddress & 0xFF;
PORTK = (myAddress >> 8) & 0xFF;
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"
"nop\n\t"
"nop\n\t"
"nop\n\t"
"nop\n\t");
// Switch WR(PH5) to LOW
PORTH &= ~(1 << 5);
// Leave WR low for at least 60ns
__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"
"nop\n\t"
"nop\n\t"
"nop\n\t"
"nop\n\t");
// Switch WR(PH5) to HIGH
PORTH |= (1 << 5);
// Leave WR high for at least 50ns
__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"
"nop\n\t"
"nop\n\t"
"nop\n\t"
"nop\n\t");
}
// Read one byte of data from a location specified by bank and address, 00:0000
byte readBank_SNES(byte myBank, word myAddress) {
PORTL = myBank;
PORTF = myAddress & 0xFF;
PORTK = (myAddress >> 8) & 0xFF;
// Wait for the Byte to appear on the data bus
// Arduino running at 16Mhz -> one nop = 62.5ns
// slowRom is good for 200ns, fastRom is <= 120ns; S-CPU best case read speed: 3.57MHz / 280ns
// let's be conservative and use 6 x 62.5 = 375ns
NOP;
NOP;
NOP;
NOP;
NOP;
NOP;
// Read
byte tempByte = PINC;
return tempByte;
}
void readLoRomBanks(unsigned int start, unsigned int total, FsFile* file) {
byte buffer[1024] = { 0 };
uint16_t c = 0;
uint16_t currByte = 32768;
//Initialize progress bar
uint32_t processedProgressBar = 0;
uint32_t totalProgressBar = (uint32_t)(total - start) * 1024;
draw_progressbar(0, totalProgressBar);
for (word currBank = start; currBank < total; currBank++) {
PORTL = currBank;
// Blink led
blinkLED();
currByte = 32768;
while (1) {
c = 0;
while (c < 1024) {
PORTF = (currByte & 0xFF);
PORTK = ((currByte >> 8) & 0xFF);
// Wait for the Byte to appear on the data bus
// Arduino running at 16Mhz -> one nop = 62.5ns
// slowRom is good for 200ns, fastRom is <= 120ns; S-CPU best case read speed: 3.57MHz / 280ns
// let's be conservative and use 6 x 62.5 = 375ns
NOP;
NOP;
NOP;
NOP;
NOP;
NOP;
buffer[c] = PINC;
c++;
currByte++;
}
file->write(buffer, 1024);
// exit while(1) loop once the uint16_t currByte overflows from 0xffff to 0 (current bank is done)
if (currByte == 0) break;
}
// update progress bar
processedProgressBar += 1024;
draw_progressbar(processedProgressBar, totalProgressBar);
}
}
void readHiRomBanks(unsigned int start, unsigned int total, FsFile* file) {
byte buffer[1024] = { 0 };
uint16_t c = 0;
uint16_t currByte = 0;
//Initialize progress bar
uint32_t processedProgressBar = 0;
uint32_t totalProgressBar = (uint32_t)(total - start) * 1024;
draw_progressbar(0, totalProgressBar);
for (word currBank = start; currBank < total; currBank++) {
PORTL = currBank;
// Blink led
blinkLED();
currByte = 0;
while (1) {
c = 0;
while (c < 1024) {
PORTF = (currByte & 0xFF);
PORTK = ((currByte >> 8) & 0xFF);
// Wait for the Byte to appear on the data bus
// Arduino running at 16Mhz -> one nop = 62.5ns
// slowRom is good for 200ns, fastRom is <= 120ns; S-CPU best case read speed: 3.57MHz / 280ns
// let's be conservative and use 6 x 62.5 = 375ns
NOP;
NOP;
NOP;
NOP;
NOP;
NOP;
buffer[c] = PINC;
c++;
currByte++;
}
file->write(buffer, 1024);
// exit while(1) loop once the uint16_t currByte overflows from 0xffff to 0 (current bank is done)
if (currByte == 0) break;
}
// update progress bar
processedProgressBar += 1024;
draw_progressbar(processedProgressBar, totalProgressBar);
}
}
/******************************************
SNES ROM Functions
******************************************/
void getCartInfo_SNES() {
boolean manualConfig = 0;
//Prime SA1 cartridge
PORTL = 192;
for (uint16_t currByte = 0; currByte < 1024; currByte++) {
PORTF = currByte & 0xFF;
PORTK = currByte >> 8;
// Wait for the Byte to appear on the data bus
// Arduino running at 16Mhz -> one nop = 62.5ns
// slowRom is good for 200ns, fastRom is <= 120ns; S-CPU best case read speed: 3.57MHz / 280ns
// let's be conservative and use 6 x 62.5 = 375ns
NOP;
NOP;
NOP;
NOP;
NOP;
NOP;
}
// Print start page
if (checkcart_SNES() == 0) {
// Checksum either corrupt or 0000
manualConfig = 1;
errorLvl = 1;
setColor_RGB(255, 0, 0);
display_Clear();
println_Msg(F("ERROR"));
println_Msg(F("Rom header corrupt"));
println_Msg(F("or missing"));
println_Msg(FS(FSTRING_EMPTY));
println_Msg(FS(FSTRING_EMPTY));
println_Msg(F("Press button for"));
println_Msg(F("manual configuration"));
println_Msg(F("or powercycle if SA1"));
display_Update();
wait();
// Wait() clears errors but in this case we still have an error
errorLvl = 1;
}
display_Clear();
print_Msg(F("Title: "));
println_Msg(romName);
print_Msg(F("Revision: "));
println_Msg(romVersion);
print_Msg(F("Type: "));
if (romType == HI)
print_Msg(F("HiROM"));
else if (romType == LO)
print_Msg(F("LoROM"));
else if (romType == EX)
print_Msg(F("ExHiRom"));
else
print_Msg(romType);
print_Msg(FS(FSTRING_SPACE));
if (romSpeed == 0)
println_Msg(F("SlowROM"));
else if (romSpeed == 2)
println_Msg(F("SlowROM"));
else if (romSpeed == 3)
println_Msg(F("FastROM"));
else
println_Msg(romSpeed);
print_Msg(F("ICs: ROM "));
if (romChips == 0)
println_Msg(F("ONLY"));
else if (romChips == 1)
println_Msg(F("RAM"));
else if (romChips == 2)
println_Msg(F("SAVE"));
else if (romChips == 3)
println_Msg(F("DSP1"));
else if (romChips == 4)
println_Msg(F("DSP1 RAM"));
else if (romChips == 5)
println_Msg(F("DSP1 SAVE"));
else if ((romChips == 19) || (romChips == 20) || (romChips == 21) || (romChips == 26))
println_Msg(F("SuperFX"));
else if (romChips == 52) {
println_Msg(F("SA1 RAM"));
romType = SA;
} else if (romChips == 53) {
println_Msg(F("SA1 RAM BATT"));
romType = SA;
} else if (romChips == 67) {
println_Msg(F("SDD1"));
} else if (romChips == 69) {
println_Msg(F("SDD1 BATT"));
} else if (romChips == 85)
println_Msg(F("SRTC RAM BATT"));
else if (romChips == 227)
println_Msg(F("RAM GBoy"));
else if (romChips == 243)
println_Msg(F("CX4"));
else if (romChips == 246)
println_Msg(F("DSP2"));
else if (romChips == 245)
println_Msg(F("SPC RAM BATT"));
else if (romChips == 249)
println_Msg(F("SPC RAM RTC"));
else
println_Msg(FS(FSTRING_EMPTY));
if (altconf)
print_Msg(F("Rom Size: "));
else
print_Msg(F("ROM Size: "));
if ((romSize >> 3) < 1) {
print_Msg(1024 * romSize >> 3);
print_Msg(F(" KB"));
} else {
print_Msg(romSize >> 3);
print_Msg(F(" MB"));
}
print_Msg(F(" ("));
print_Msg(numBanks);
println_Msg(F(" banks)"));
//print_Msg(F("Chips: "));
//println_Msg(romChips);
print_Msg(F("Save Size: "));
print_Msg(sramSize >> 3);
println_Msg(F(" KB"));
print_Msg(F("Checksum: "));
println_Msg(checksumStr);
display_Update();
// Wait for user input
#if (defined(ENABLE_LCD) || defined(ENABLE_OLED))
// Prints string out of the common strings array either with or without newline
print_STR(press_button_STR, 1);
display_Update();
wait();
#endif
#ifdef ENABLE_SERIAL
println_Msg(FS(FSTRING_SPACE));
#endif
// Start manual config
if (manualConfig == 1) {
confMenuManual();
}
}
void checkAltConf(char crcStr[9]) {
char tempStr2[5];
char tempStr3[9];
altconf = 0;
if (myFile.open("snes.txt", O_READ)) {
// Get cart info
display_Clear();
println_Msg(F("Searching database..."));
print_Msg(F("Checksum: "));
println_Msg(checksumStr);
display_Update();
while (myFile.available()) {
// Skip first line with name
skip_line(&myFile);
// Skip over the CRC checksum
myFile.seekCur(9);
// Get internal ROM checksum as string
for (byte j = 0; j < 4; j++) {
tempStr2[j] = char(myFile.read());
}
tempStr2[4] = '\0';
// Check if checksum string is a match else go to next entry in database
if (strcmp(tempStr2, checksumStr) == 0) {
// Skip the , in the file
myFile.seekCur(1);
// Read the CRC32 of the SNES header out of database
for (byte k = 0; k < 8; k++) {
tempStr3[k] = char(myFile.read());
}
tempStr3[8] = '\0';
print_Msg(F("Header CRC32: "));
println_Msg(tempStr3);
display_Update();
// Skip the , in the file
myFile.seekCur(1);
// Read file size
byte romSize2 = (myFile.read() - 48) * 10 + (myFile.read() - 48);
// Skip the , in the file
myFile.seekCur(1);
// Read number of banks
byte numBanks2 = (myFile.read() - 48) * 100 + (myFile.read() - 48) * 10 + (myFile.read() - 48);
// skip CRLF
myFile.seekCur(2);
// skip third empty line
skip_line(&myFile);
// Some games have the same checksum, so compare CRC32 of header area with database too
if (strcmp(tempStr3, crcStr) == 0) {
println_Msg(F("Found"));
display_Update();
// Game found, check if ROM sizes differ but only change ROM size if non- standard size found in database, else trust the header to be right and the database to be wrong
if (((romSize != romSize2) || (numBanks != numBanks2)) && ((romSize2 == 10) || (romSize2 == 12) || (romSize2 == 20) || (romSize2 == 24) || (romSize2 == 40) || (romSize2 == 48))) {
// Correct size
println_Msg(F("Correcting size"));
print_Msg(F("Size: "));
print_Msg(romSize);
print_Msg(F(" -> "));
print_Msg(romSize2);
println_Msg(F("Mbit"));
print_Msg(F("Banks: "));
print_Msg(numBanks);
print_Msg(F(" -> "));
println_Msg(numBanks2);
display_Update();
delay(1000);
romSize = romSize2;
numBanks = numBanks2;
altconf = 1;
}
break;
}
}
// If no match go to next entry
else {
// skip rest of line
myFile.seekCur(18);
// skip third empty line
skip_line(&myFile);
}
}
// Close the file:
myFile.close();
}
}
// Read header
boolean checkcart_SNES() {
// set control to read
dataIn();
uint16_t headerStart = 0xFFB0;
byte snesHeader[80];
PORTL = 0;
for (uint16_t c = 0, currByte = headerStart; c < 80; c++, currByte++) {
PORTF = (currByte & 0xFF);
PORTK = ((currByte >> 8) & 0xFF);
NOP;
NOP;
NOP;
NOP;
NOP;
NOP;
NOP;
NOP;
NOP;
NOP;
NOP;
NOP;
snesHeader[c] = PINC;
}
// Calculate CRC32 of header
char crcStr[9];
sprintf(crcStr, "%08lX", calculateCRC(snesHeader, 80));
// Get Checksum as string
sprintf(checksumStr, "%02X%02X", snesHeader[0xFFDF - headerStart], snesHeader[0xFFDE - headerStart]);