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mapper_001_mmc1.cpp
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mapper_001_mmc1.cpp
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#include "mapper_001_mmc1.h"
mapper_001::mapper_001(rom * r): mapper(r) {
prg_lo_offset=0;
prg_hi_offset=(cart->prom_pages - 1) * PRG_PAGE_SIZE;
chr_lo_offset = 0;
chr_hi_offset = 0x1000;
mmc1_reg.reg0.val = 0x0c;
mmc1_reg.reg1.val = 0;
mmc1_reg.reg2.val = 0;
mmc1_reg.reg3.val = 0;
mmc1_reg.counter = 0;
for(int i=0;i<5;++i) {
mmc1_reg.temp[i]=false;
}
if(0x01 & (cart->header[6])) {
mmc1_reg.reg0.mirror=false;
mmc1_reg.reg0.obey_mirror=true;
}
else if(0x08 & (cart->header[6])) {
mmc1_reg.reg0.mirror=false;
mmc1_reg.reg0.obey_mirror=false;
}
else {
mmc1_reg.reg0.mirror=true;
mmc1_reg.reg0.obey_mirror=true;
}
mmc1_reg.reg0.high_low = true;
mmc1_reg.reg0.large_small_prg = true;
mmc1_reg.reg0.large_small_chr = false;
}
const unsigned int mapper_001::get_pbyte(const unsigned int addr) {
if(addr < 0xC000) {
//std::cout<<std::hex<<"Addr: "<<addr<<"("<<addr-0x8000+prg_lo_offset<<")"<<std::endl;
return cart->prom[addr-0x8000 + prg_lo_offset];
}
else {
//std::cout<<std::hex<<"Addr: "<<addr<<"("<<addr-0xc000+prg_hi_offset<<")"<<std::endl;
//std::cout<<"Cart: "<<cart<<std::endl;
return cart->prom[addr-0xC000 + prg_hi_offset];
}
}
const unsigned int mapper_001::get_pword(const unsigned int addr) {
if(addr < 0xC000) {
//std::cout<<"Reading: 0x"<<std::hex<<addr<<" (0x"<<(addr-0x8000+prg_lo_offset)<<")"<<std::endl;
return cart->prom_w[addr-0x8000 + prg_lo_offset];
}
else {
//std::cout<<"Reading: 0x"<<std::hex<<addr<<" (0x"<<(addr-0xc000+prg_hi_offset)<<")"<<std::endl;
return cart->prom_w[addr-0xC000 + prg_hi_offset];
}
}
const unsigned int mapper_001::get_cbyte(const unsigned int addr) {
if(addr>=8192) {
std::cout<<"Trying to get CHR byte at address: "<<addr<<std::endl;
return 0;
}
if(addr < 0x1000) return cart->crom[addr+chr_lo_offset];
else return cart->crom[addr-0x1000+chr_hi_offset];
}
void mapper_001::put_pbyte(const unsigned int cycle, const unsigned int val,const unsigned int addr) {
//std::printf("MMC1: %04x = %02x (",addr,val);
if(val < 128 && mmc1_reg.counter < 4) {
if(mmc1_reg.counter == 0) {
//std::cout<<std::endl<<std::endl<<"Initializing new MMC1 register write!"<<std::endl;
}
//std::printf("Set temp[%d] to %d\n",mmc1_reg_counter,((val&1)==1?1:0));
if((val & 1) == 1) {
mmc1_reg.temp[mmc1_reg.counter]=true;
}
else {
mmc1_reg.temp[mmc1_reg.counter]=false;
}
++(mmc1_reg.counter);
} else if(val < 128 && mmc1_reg.counter == 4) {
if(val & 1) {
mmc1_reg.temp[mmc1_reg.counter]=true;
}
else {
mmc1_reg.temp[mmc1_reg.counter]=false;
}
mmc1_reg.counter=0;
//std::printf("MMC1: %04x = %02x\n",addr,tempval(mmc1_reg.temp));
//std::cout<<"Setting addr "<<std::hex<<addr<<" to "<<tempval(mmc1_reg.temp)<<std::endl;
if(addr >= 0x8000 && addr <= 0x9fff) {
int mirror = mmc1_reg.reg0.mirror;
int one_screen = mmc1_reg.reg0.obey_mirror;
mmc1_reg.reg0.val = tempval(mmc1_reg.temp);
if(mirror != mmc1_reg.reg0.mirror) {
std::cout<<"Mirror mode changed to "<<!mirror<<"!"<<std::endl;
if(mmc1_reg.reg0.mirror == 0) ppu_change(cycle, set_vert, 0);
if(mmc1_reg.reg0.mirror == 1) ppu_change(cycle, set_horiz, 0);
}
if(one_screen != mmc1_reg.reg0.obey_mirror) {
std::cout<<"One-screen mode changed!"<<std::endl;
if(mmc1_reg.reg0.obey_mirror == 0) ppu_change(cycle, set_4_scr, 0);
else if(mmc1_reg.reg0.mirror == 0) ppu_change(cycle, set_vert, 0);
else if(mmc1_reg.reg0.mirror == 1) ppu_change(cycle, set_horiz, 0);
}
//std::cout<<"Mirror: "<<(mmc1_reg.reg0.mirror?'H':'V')<<" One-Screen: "<<(!mmc1_reg.reg0.obey_mirror);
//std::cout<<" PRG Switch: "<<(mmc1_reg.reg0.high_low?'L':'H')<<" PRG Size: "<<(mmc1_reg.reg0.large_small_prg?'S':'L');
//std::cout<<" CHR Size: "<<(mmc1_reg.reg0.large_small_chr?'S':'L')<<std::endl;
} else if(addr >= 0xa000 && addr <= 0xbfff) {
mmc1_reg.reg1.val = tempval(mmc1_reg.temp);
if(mmc1_reg.reg0.large_small_chr) { //small chr
cart->updated_crom = 3;
int new_chr_lo_offset = mmc1_reg.reg1.val * 0x1000;
int new_chr_hi_offset = mmc1_reg.reg2.val * 0x1000;
ppu_change(cycle, lo_crom, new_chr_lo_offset);
ppu_change(cycle, hi_crom, new_chr_hi_offset);
} else {
cart->updated_crom = 3;
int new_chr_lo_offset = mmc1_reg.reg1.val * 0x2000;
int new_chr_hi_offset = mmc1_reg.reg1.val * 0x2000 + 0x1000;
ppu_change(cycle, lo_crom, new_chr_lo_offset);
ppu_change(cycle, hi_crom, new_chr_hi_offset);
}
//std::cout<<"CHR ROM bank switching not properly implemented. Sry, dude!"<<std::endl;
} else if(addr >= 0xc000 && addr <= 0xdfff) {
mmc1_reg.reg2.val=tempval(mmc1_reg.temp);
if(mmc1_reg.reg0.large_small_chr) { //small chr
cart->updated_crom = 3;
int new_chr_lo_offset = mmc1_reg.reg1.val * 0x1000;
int new_chr_hi_offset = mmc1_reg.reg2.val * 0x1000;
ppu_change(cycle, lo_crom, new_chr_lo_offset);
ppu_change(cycle, hi_crom, new_chr_hi_offset);
} else {
cart->updated_crom = 3;
int new_chr_lo_offset = mmc1_reg.reg1.val * 0x2000;
int new_chr_hi_offset = mmc1_reg.reg1.val * 0x2000 + 0x1000;
ppu_change(cycle, lo_crom, new_chr_lo_offset);
ppu_change(cycle, hi_crom, new_chr_hi_offset);
}
//std::cout<<"CHR ROM bank switching not properly implemented. Sry, dude!"<<std::endl;
} else if(addr >= 0xe000 && addr <= 0xffff) {
mmc1_reg.reg3.val=tempval(mmc1_reg.temp);
if(!mmc1_reg.reg0.large_small_prg) { //32KiB switching is "false" value
int temp = mmc1_reg.reg3.val >>(1);
prg_lo_offset=temp*0x8000;
prg_hi_offset=temp*0x8000+PRG_PAGE_SIZE;
} else if(mmc1_reg.reg0.high_low) { //Switch low PRG
prg_lo_offset=mmc1_reg.reg3.val*16384;
prg_hi_offset=(cart->prom_pages -1) * PRG_PAGE_SIZE;
} else { //Switch high PRG
prg_lo_offset=0;
prg_hi_offset=mmc1_reg.reg3.val*16384;
}
}
} else if(val>=128) {
//std::printf("MMC1: %04x reset\n",addr);
mmc1_reg.counter=0;
if(addr>=0x8000&&addr<=0x9fff) {
//mmc1_reg.reg0.val = 0;
mmc1_reg.reg0.val |= 0x0C;
//mmc1_reg.reg0.high_low = 1;
//mmc1_reg.reg0.large_small_prg = 1;
//std::cout<<"Clear reg 0"<<std::endl;
} else if(addr>=0xa000&&addr<=0xbfff) {
mmc1_reg.reg1.val = 0;
//std::cout<<"Clear reg 1"<<std::endl;
} else if(addr>=0xc000&&addr<=0xdfff) {
mmc1_reg.reg2.val = 0;
//std::cout<<"Clear reg 2"<<std::endl;
} else if(addr>=0xe000&&addr<=0xffff) {
mmc1_reg.reg3.val = 0;
//std::cout<<"Clear reg 3"<<std::endl;
}
}
}
bool mapper_001::put_cbyte(const unsigned int val,const unsigned int addr) {
if(cart->crom_pages == 0) {
cart->crom[addr]=val;
return true;
}
else return false;
}
int mapper_001::changed_crom() {
return 0;
}
void mapper_001::ppu_change(unsigned int cycle, rom_command_t comm, unsigned int val) {
ppu_queue.push_back(std::make_pair(cycle, std::make_pair(comm, val)));
}
rom::ppu_change_t mapper_001::cycle_forward(unsigned int cycle) {
rom::ppu_change_t p;
p.val=0;
return p;
}
int mapper_001::tempval(bool * val) {
int retval = 0;
for(int i = 4; i >= 0; --i) {
retval<<=(1);
retval |= int(val[i]);
}
return retval;
}
const unsigned int mapper_001::get_page(const unsigned int addr) {
if(addr < 0xc000) {
return prg_lo_offset / PRG_PAGE_SIZE;
}
else {
return prg_hi_offset / PRG_PAGE_SIZE;
}
}