mirror of https://github.com/sanni/cartreader.git
414 lines
10 KiB
C++
414 lines
10 KiB
C++
//******************************************
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// SNES Game Processor RAM Cassette code by LuigiBlood
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// Revision 1.0.0 February 2024
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//******************************************
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#ifdef ENABLE_GPC
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/******************************************
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Game Processor RAM Cassette
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******************************************/
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/******************************************
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Prototype Declarations
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*****************************************/
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/* Hoping that sanni will use this progressbar function */
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extern void draw_progressbar(uint32_t processedsize, uint32_t totalsize);
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//void gpcMenu();
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void readRAM_GPC();
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//void setup_GPC();
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void writeRAM_GPC(void);
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/******************************************
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Variables
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*****************************************/
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//No global variables
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/******************************************
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Menu
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*****************************************/
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// GPC flash menu items
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static const char gpcFlashMenuItem1[] PROGMEM = "Read RAM";
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static const char gpcFlashMenuItem2[] PROGMEM = "Write RAM";
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static const char* const menuOptionsGPCFlash[] PROGMEM = { gpcFlashMenuItem1, gpcFlashMenuItem2, FSTRING_RESET };
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void gpcMenu() {
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// create menu with title and 3 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(menuOptionsGPCFlash, 3);
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mainMenu = question_box(F("Game Processor RAM"), 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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// Read ram
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case 0:
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// Change working dir to root
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sd.chdir("/");
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readRAM_GPC();
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break;
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// Write ram
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case 1:
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// Change working dir to root
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sd.chdir("/");
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writeRAM_GPC();
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unsigned long wrErrors;
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wrErrors = verifyRAM_GPC();
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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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} else {
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print_STR(error_STR, 0);
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print_Msg(wrErrors);
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print_STR(_bytes_STR, 1);
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print_Error(did_not_verify_STR);
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}
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wait();
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break;
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// Reset
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case 2:
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resetArduino();
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break;
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}
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}
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/******************************************
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Setup
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*****************************************/
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void setup_GPC() {
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// Request 5V
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setVoltage(VOLTS_SET_5V);
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// Set cicrstPin(PG1) to Output
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DDRG |= (1 << 1);
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// Output a high signal until we're ready to start
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PORTG |= (1 << 1);
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// Set cichstPin(PG0) to Input
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DDRG &= ~(1 << 0);
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// Adafruit Clock Generator
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i2c_found = clockgen.init(SI5351_CRYSTAL_LOAD_8PF, 0, 0);
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if (i2c_found) {
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clockgen.set_pll(SI5351_PLL_FIXED, SI5351_PLLA);
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clockgen.set_pll(SI5351_PLL_FIXED, SI5351_PLLB);
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clockgen.set_freq(2147727200ULL, SI5351_CLK0);
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clockgen.set_freq(307200000ULL, SI5351_CLK2);
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clockgen.output_enable(SI5351_CLK0, 1);
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clockgen.output_enable(SI5351_CLK1, 0);
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clockgen.output_enable(SI5351_CLK2, 1);
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}
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#ifdef ENABLE_CLOCKGEN
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else {
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display_Clear();
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print_FatalError(F("Clock Generator not found"));
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}
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#endif
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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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//BA0-BA7
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DDRL = 0xFF;
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//PA0-PA7
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DDRA = 0xFF;
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// Set Control Pins to Output RST(PH0) CS(PH3) WR(PH5) RD(PH6)
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DDRH |= (1 << 0) | (1 << 3) | (1 << 5) | (1 << 6);
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// Switch RST(PH0) and WR(PH5) to HIGH
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PORTH |= (1 << 0) | (1 << 5);
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// Switch CS(PH3) and RD(PH6) to LOW
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PORTH &= ~((1 << 3) | (1 << 6));
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// Set Refresh(PE5) to Output
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DDRE |= (1 << 5);
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// Switch Refresh(PE5) to LOW (needed for SA-1)
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PORTE &= ~(1 << 5);
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// Set CPU Clock(PH1) to Output
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DDRH |= (1 << 1);
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//PORTH &= ~(1 << 1);
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// Set IRQ(PH4) to Input
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DDRH &= ~(1 << 4);
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// Activate Internal Pullup Resistors
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//PORTH |= (1 << 4);
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// Set expand(PG5) to output
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DDRG |= (1 << 5);
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// Output High
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PORTG |= (1 << 5);
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// Set Data Pins (D0-D7) to Input
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DDRC = 0x00;
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// Enable Internal Pullups
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//PORTC = 0xFF;
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// Unused pins
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// Set wram(PE4) to Output
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DDRE |= (1 << 4);
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//PORTE &= ~(1 << 4);
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// Set pawr(PJ1) to Output
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DDRJ |= (1 << 1);
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//PORTJ &= ~(1 << 1);
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// Set pard(PJ0) to Output
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DDRJ |= (1 << 0);
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//PORTJ &= ~(1 << 0);
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// Start CIC by outputting a low signal to cicrstPin(PG1)
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PORTG &= ~(1 << 1);
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// Wait for CIC reset
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delay(1000);
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}
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/******************************************
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Low level functions
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*****************************************/
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// Write one byte of data to a location specified by bank and address, 00:0000
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void writeBank_GPC(byte myBank, word myAddress, byte myData) {
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PORTL = myBank;
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PORTF = myAddress & 0xFF;
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PORTK = (myAddress >> 8) & 0xFF;
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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"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"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"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"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"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t");
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}
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// Read one byte of data from a location specified by bank and address, 00:0000
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byte readBank_GPC(byte myBank, word myAddress) {
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PORTL = myBank;
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PORTF = myAddress & 0xFF;
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PORTK = (myAddress >> 8) & 0xFF;
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// Arduino running at 16Mhz -> one nop = 62.5ns -> 1000ns total
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__asm__("nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t"
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"nop\n\t");
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// Read
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byte tempByte = PINC;
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return tempByte;
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}
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/******************************************
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Game Processor RAM Cassette functions
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*****************************************/
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// Read RAM cassette to SD card
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void readRAM_GPC() {
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// Set control
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dataIn();
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controlIn_SNES();
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// Get name, add extension and convert to char array for sd lib
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createFolder("SNES", "ROM", "GPC4M", "sfc");
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//clear the screen
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display_Clear();
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print_STR(saving_to_STR, 0);
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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(0, 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_FatalError(create_file_STR);
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}
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// Read Banks
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for (int currBank = 0xC0; currBank < 0xC8; currBank++) {
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// Dump the bytes to SD 512B at a time
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for (long currByte = 0; currByte < 65536; currByte += 512) {
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draw_progressbar((currBank - 0xC0) * 0x10000 + currByte, 0x80000);
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for (int c = 0; c < 512; c++) {
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sdBuffer[c] = readBank_GPC(currBank, currByte + c);
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}
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myFile.write(sdBuffer, 512);
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}
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}
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draw_progressbar(0x80000, 0x80000); //Finish drawing progress bar
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// Close the file:
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myFile.close();
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println_Msg(F("Read ram completed"));
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display_Update();
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wait();
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}
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void writeRAM_GPC(void) {
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//Display file Browser and wait user to select a file. Size must be 512KB.
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filePath[0] = '\0';
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sd.chdir("/");
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fileBrowser(F("Select SFC file"));
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// Create filepath
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sprintf(filePath, "%s/%s", filePath, fileName);
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display_Clear();
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//open file on sd card
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if (myFile.open(filePath, O_READ)) {
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fileSize = myFile.fileSize();
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if (fileSize != 0x80000) {
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println_Msg(F("File must be 512KB"));
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display_Update();
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myFile.close();
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wait();
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return;
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}
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//Disable ram cassette write protection
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dataOut();
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controlOut_SNES();
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for (int countProtect = 0; countProtect < 15; countProtect++) {
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writeBank_GPC(0x20, 0x6000, 0x00);
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}
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//Write ram
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dataOut();
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controlOut_SNES();
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println_Msg(F("Writing ram..."));
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display_Update();
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for (int currBank = 0xC0; currBank < 0xC8; currBank++) {
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//startAddr = 0x0000
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for (long currByte = 0x0000; currByte < 0x10000; currByte += 512) {
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myFile.read(sdBuffer, 512);
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for (unsigned long c = 0; c < 512; c++) {
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//startBank = 0x10; CS low
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writeBank_GPC(currBank, currByte + c, sdBuffer[c]);
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}
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}
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draw_progressbar(((currBank - 0xC0) * 0x10000), 0x80000);
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}
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//reenable write protection
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dataIn();
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controlIn_SNES();
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byte keepByte = readBank_GPC(0x20, 0x6000);
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delay(100);
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dataOut();
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controlOut_SNES();
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writeBank_GPC(0x20, 0x6000, keepByte);
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draw_progressbar(0x80000, 0x80000);
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delay(100);
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// Set pins to input
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dataIn();
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// Close the file:
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myFile.close();
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println_Msg("");
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println_Msg(F("RAM writing finished"));
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display_Update();
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} else {
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print_Error(FS(FSTRING_FILE_DOESNT_EXIST));
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}
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}
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// Check if the RAM was written without any error
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unsigned long verifyRAM_GPC() {
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//open file on sd card
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if (myFile.open(filePath, O_READ)) {
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// Variable for errors
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writeErrors = 0;
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// Set control
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controlIn_SNES();
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//startBank = 0xC0; endBank = 0xC7; CS low
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for (byte currBank = 0xC0; currBank < 0xC8; currBank++) {
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//startAddr = 0x0000
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for (long currByte = 0x0000; currByte < 0x10000; currByte += 512) {
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//fill sdBuffer
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myFile.read(sdBuffer, 512);
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for (unsigned long c = 0; c < 512; c++) {
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if ((readBank_GPC(currBank, currByte + c)) != sdBuffer[c]) {
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writeErrors++;
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}
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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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return writeErrors;
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} else {
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print_Error(F("Can't open file"));
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return 1;
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}
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}
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#endif
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//******************************************
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// End of File
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//******************************************
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