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Gericom
2025-11-16 15:41:34 +01:00
commit 4511cab6d1
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src/ntrCardRomGame.c Normal file
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#include "common.h"
#include <stdio.h>
#include "xor.h"
#include "romData.h"
#include "scramblerRing.h"
#include "ntrCardRom.h"
#include "ntrCardRomGameNoScramble.h"
#include "ntrCardRomGame.h"
void ntrc_gameCmd1Unknown(ntr_rom_emu_t* romEmu, u32 word, pio_hw_t* pio)
{
ntrc_noPayload(pio);
ntrc_finishGameCmd1(romEmu, 0);
//do not receive further commands until card reset
irq_set_enabled(PIO0_IRQ_0, false);
puts("Unknown game command");
printf("%08X%08X\n", romEmu->cmd0, romEmu->cmd1);
}
void __time_critical_func(ntrc_gameCmd0Dummy)(ntr_rom_emu_t* romEmu, u32 word, pio_hw_t* pio)
{
ntrc_finishGameCmd0(romEmu);
}
void __time_critical_func(ntrc_gameCmd1Dummy0)(ntr_rom_emu_t* romEmu, u32 word, pio_hw_t* pio)
{
ntrc_finishGameCmd1(romEmu, 0);
}
void __time_critical_func(ntrc_gameCmd1Dummy4)(ntr_rom_emu_t* romEmu, u32 word, pio_hw_t* pio)
{
ntrc_finishGameCmd1(romEmu, 1);
}
void __scratch_y("cpu0") ntrc_gameReadPageCmd0(ntr_rom_emu_t* romEmu, u32 word, pio_hw_t* pio)
{
ntrc_beginWrite(pio, 512);
ntrc_finishGameCmd0(romEmu);
}
void __scratch_y("cpu0") ntrc_gameReadPageCmd1(ntr_rom_emu_t* romEmu, u32 word, pio_hw_t* pio)
{
u32 address = romEmu->cmd0 << 8;
if (address + 512 <= romEmu->romSize)
{
u32 rPtr = gScramblerRingRPtr;
u32* outPtr = (u32*)&gScrambleBuffers[gFreeScrambleBuf][0];
u32* inPtr = (u32*)&romEmu->romData[address];
applyXor(inPtr, romEmu->scrRingRPtr + 1, outPtr, 512);
}
else
{
//just send some garbage
}
ntrc_dmaToBus(&gScrambleBuffers[gFreeScrambleBuf][0], 512);
gFreeScrambleBuf = 1 - gFreeScrambleBuf;
ntrc_finishGameCmd1(romEmu, 128);
}
void __scratch_y("cpu0") ntrc_gameReadIdCmd0(ntr_rom_emu_t* romEmu, u32 word, pio_hw_t* pio)
{
ntrc_beginWrite(pio, 4);
ntrc_writeWord(pio, romEmu->cardId ^ romEmu->scrRingRPtr[2]); //0=cmd0,1=cmd1,2=payload
ntrc_finishGameCmd0(romEmu);
}
void __scratch_y("cpu0") ntrc_gameDisableScrambleCmd1(ntr_rom_emu_t* romEmu, u32 word, pio_hw_t* pio)
{
ntrc_setGameNoScrambleMode();
ntrc_noPayload(pio);
ntrc_finishGameCmd1(romEmu, 0);
}
extern void ntrc_gameCmd0Handler(ntr_rom_emu_t* romEmu, u32 word, pio_hw_t* pio);
extern void ntrc_gameCmd1Handler(ntr_rom_emu_t* romEmu, u32 word, pio_hw_t* pio);
void __time_critical_func(ntrc_setGameMode)(void)
{
gNtrRomEmu.cmd0Handler = ntrc_gameCmd0Handler;
gNtrRomEmu.cmd1Handler = ntrc_gameCmd1Handler;
gNtrRomEmu.mode = NTR_CARD_MODE_GAME;
}