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Basic GB Camera support (Emulate only MBC, enough for the ROM to boot).

This commit is contained in:
Lior Halphon 2016-10-02 03:40:11 +03:00
parent 9b71454f07
commit b3b041a151
3 changed files with 18 additions and 5 deletions
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2
Core/gb.h
View File

@ -172,6 +172,7 @@ typedef struct {
enum {
GB_STANDARD_MBC,
GB_HUC1, /* Todo: HUC1 features are not emulated. Should be unified with the CGB IR sensor API. */
GB_CAMERA, /* Not emulated as well */
} mbc_subtype;
bool has_ram;
bool has_battery;
@ -282,6 +283,7 @@ typedef struct GB_gameboy_s {
} mbc5;
};
uint16_t mbc_rom0_bank; /* For some MBC1 wirings. */
bool camera_registers_mapped;
);

2
Core/mbc.c
View File

@ -41,7 +41,7 @@ const GB_cartridge_t GB_cart_defs[256] = {
{ GB_MBC5 , GB_STANDARD_MBC, true , true , false, true }, // 1Eh MBC5+RUMBLE+RAM+BATTERY
[0xFC] =
// Todo: What are these?
{ GB_NO_MBC, GB_STANDARD_MBC, false, false, false, false}, // FCh POCKET CAMERA
{ GB_MBC5 , GB_CAMERA , true, true, false, false}, // FCh POCKET CAMERA
{ GB_NO_MBC, GB_STANDARD_MBC, false, false, false, false}, // FDh BANDAI TAMA5
{ GB_NO_MBC, GB_STANDARD_MBC, false, false, false, false}, // FEh HuC3
{ GB_MBC1 , GB_HUC1 , true , true , false, false}, // FFh HuC1+RAM+BATTERY

19
Core/memory.c
View File

@ -74,7 +74,7 @@ static uint8_t read_vram(GB_gameboy_t *gb, uint16_t addr)
static uint8_t read_mbc_ram(GB_gameboy_t *gb, uint16_t addr)
{
if (!gb->mbc_ram_enable || !gb->mbc_ram_size) return 0xFF;
if ((!gb->mbc_ram_enable || !gb->mbc_ram_size) && gb->cartridge_type->mbc_subtype != GB_CAMERA) return 0xFF;
if (gb->cartridge_type->has_rtc && gb->mbc_ram_bank >= 8 && gb->mbc_ram_bank <= 0xC) {
/* RTC read */
@ -82,6 +82,10 @@ static uint8_t read_mbc_ram(GB_gameboy_t *gb, uint16_t addr)
return gb->rtc_latched.data[gb->mbc_ram_bank - 8];
}
if (gb->camera_registers_mapped) {
return 0;
}
if (!gb->mbc_ram) {
return 0xFF;
}
@ -282,7 +286,7 @@ static void write_mbc(GB_gameboy_t *gb, uint16_t addr, uint8_t value)
break;
case GB_MBC2:
switch (addr & 0xF000) {
case 0x0000: case 0x1000: if (!(addr & 0x100)) gb->mbc_ram_enable = value == 10; break;
case 0x0000: case 0x1000: if (!(addr & 0x100)) gb->mbc_ram_enable = value == 0xA; break;
case 0x2000: case 0x3000: if ( addr & 0x100) gb->mbc2.rom_bank = value; break;
}
break;
@ -292,7 +296,7 @@ static void write_mbc(GB_gameboy_t *gb, uint16_t addr, uint8_t value)
case 0x2000: case 0x3000: gb->mbc3.rom_bank = value; break;
case 0x4000: case 0x5000: gb->mbc3.ram_bank = value; break;
case 0x6000: case 0x7000:
if (!gb->rtc_latch && (value & 1)) { /* Todo: verify condition is correct*/
if (!gb->rtc_latch && (value & 1)) { /* Todo: verify condition is correct */
memcpy(&gb->rtc_latched, &gb->rtc_real, sizeof(gb->rtc_real));
}
gb->rtc_latch = value & 1;
@ -304,7 +308,10 @@ static void write_mbc(GB_gameboy_t *gb, uint16_t addr, uint8_t value)
case 0x0000: case 0x1000: gb->mbc_ram_enable = (value & 0xF) == 0xA; break;
case 0x2000: gb->mbc5.rom_bank_low = value; break;
case 0x3000: gb->mbc5.rom_bank_high = value; break;
case 0x4000: case 0x5000: gb->mbc5.ram_bank = value; break;
case 0x4000: case 0x5000:
gb->mbc5.ram_bank = value;
gb->camera_registers_mapped = (value & 0x10) && gb->cartridge_type->mbc_subtype == GB_CAMERA;
break;
}
break;
}
@ -333,6 +340,10 @@ static void write_mbc_ram(GB_gameboy_t *gb, uint16_t addr, uint8_t value)
return;
}
if (gb->camera_registers_mapped) {
return;
}
gb->mbc_ram[((addr & 0x1FFF) + gb->mbc_ram_bank * 0x2000) & (gb->mbc_ram_size - 1)] = value;
}