本帖最后由 zdfwyh 于 2016-5-8 18:37 编辑
移植了综合例程中NES程序到我的407板子上,运行很好,不过发现部分ROM不支持,但在Mapper目录下有源文件,只不过未移植,我想参考已经移植好的Mapper进行移植,比如,移植91号Mapper文件(因为我正好有这么一个ROM游戏不支持),却是没有显示,不知道为什么,谁能帮我看看呀.
主要修改的地方为
nes_mapper.c中添加#include "mapper/091.cpp"
同时代码修改如下
[mw_shl_code=c,true]//支持的Mapper号,自己添加
const int MapTab[] =
{
0,1,2,3,4,6,7,8,11,13,15,16,17,18,19,21,22,23,24,25,32,33,34,
64,65,66,67,69,70,71,72,73,75,76,78,79,85,87,88,91,99,113,//增加91
189,225,227,240,245,
-1,//最后一个,-1,表示不支持的map号
};[/mw_shl_code]
[mw_shl_code=c,true]void Mapper_Init(void)
{
uint32 probe;
NES_Mapper->Reset = Mapper_Reset;
NES_Mapper->Write = Mapper_Write;
NES_Mapper->Read = Mapper_Read;
NES_Mapper->WriteLow = Mapper_WriteLow;
NES_Mapper->ReadLow = Mapper_ReadLow;
NES_Mapper->HSync = Mapper_HSync;
NES_Mapper->VSync = Mapper_VSync;
VROM_mask = 0xFFFF;
for(probe = 0x8000; probe; probe >>= 1)
{
if((VROM_1K_SIZE-1) & probe) break;
VROM_mask >>= 1;
}
switch (MapperNo)
{
case 0 :MAP0_Init();break;
case 1 :MAP1_Init();break;
case 2 :MAP2_Init();break;
case 3 :MAP3_Init();break;
case 4 :MAP4_Init();break;
case 6 :MAP6_Init();break;
case 7 :MAP7_Init();break;
case 8 :MAP8_Init();break;
case 11:MAP11_Init();break;
case 13:MAP13_Init();break;
case 15:MAP15_Init();break;
case 16:MAP16_Init();break;
case 17:MAP17_Init();break;
case 18:MAP18_Init();break;
case 19:MAP19_Init();break;
case 21:MAP21_Init();break;
case 22:MAP22_Init();break;
case 23:MAP23_Init();break;
case 24:MAP24_Init();break;
case 25:MAP25_Init();break;
case 32:MAP32_Init();break;
case 33:MAP33_Init();break;
case 34:MAP34_Init();break;
case 64:MAP64_Init();break;
case 65:MAP65_Init();break;
case 66:MAP66_Init();break;
case 67:MAP67_Init();break;
case 69:MAP69_Init();break;
case 70:MAP70_Init();break;
case 71:MAP71_Init();break;
case 72:MAP72_Init();break;
case 73:MAP73_Init();break;
case 75:MAP75_Init();break;
case 76:MAP76_Init();break;
case 78:MAP78_Init();break;
case 79:MAP79_Init();break;
case 85:MAP85_Init();break;
case 87:MAP87_Init();break;
case 88:MAP88_Init();break;
case 91:MAP91_Init();break;//增加91
case 99:MAP99_Init();break;
case 113:MAP113_Init();break;
case 189:MAP189_Init();break;
case 225:MAP225_Init();break;
case 227:MAP227_Init();break;
case 240:MAP240_Init();break;
case 245:MAP245_Init();break;
default:break;
}
NES_Mapper->Reset();
}
[/mw_shl_code]
nes_main.c中
[mw_shl_code=c,true]//加载ROM
//返回值:0,成功
// 1,内存错误
// 3,map错误
u8 nes_load_rom(void)
{
u8* p;
u8 i;
u8 res=0;
p=(u8*)romfile;
if(strncmp((char*)p,"NES",3)==0)
{
RomHeader->ctrl_z=p[3];
RomHeader->num_16k_rom_banks=p[4];
RomHeader->num_8k_vrom_banks=p[5];
RomHeader->flags_1=p[6];
RomHeader->flags_2=p[7];
if(RomHeader->flags_1&0x04)p+=512; //有512字节的trainer:
if(RomHeader->num_8k_vrom_banks>0) //存在VROM,进行预解码
{
VROM_banks=p+16+(RomHeader->num_16k_rom_banks*0x4000);
#if NES_RAM_SPEED==1 //1:内存占用小 0:速度快
VROM_tiles=VROM_banks;
#else
VROM_tiles=mymalloc(SRAMEX,RomHeader->num_8k_vrom_banks*8*1024);//这里可能申请多达1MB内存!!!
if(VROM_tiles==0)VROM_tiles=VROM_banks;//内存不够用的情况下,尝试VROM_titles与VROM_banks共用内存
compile(RomHeader->num_8k_vrom_banks*8*1024/16,VROM_banks,VROM_tiles);
#endif
}else
{
VROM_banks=mymalloc(SRAMIN,8*1024);
VROM_tiles=mymalloc(SRAMEX,8*1024);
if(!VROM_banks||!VROM_tiles)res=1;
}
VROM_1K_SIZE = RomHeader->num_8k_vrom_banks * 8;
VROM_8K_SIZE = RomHeader->num_8k_vrom_banks;
MapperNo=(RomHeader->flags_1>>4)|(RomHeader->flags_2&0xf0);
if(RomHeader->flags_2 & 0x0E)MapperNo=RomHeader->flags_1>>4;//忽略高四位，如果头看起来很糟糕
printf("use map:%d
",MapperNo);
for(i=0;i<255;i++) // 查找支持的Mapper号
{
if (MapTab==MapperNo)break;
if (MapTab==-1)res=3;
}
if(res==0)
{
switch(MapperNo)
{
case 1:
MAP1=mymalloc(SRAMIN,sizeof(Mapper1Res));
if(!MAP1)res=1;
break;
case 4:
case 6:
case 16:
case 17:
case 18:
case 19:
case 21:
case 23:
case 24:
case 25:
case 64:
case 65:
case 67:
case 69:
case 85:
case 91://增加91
case 189:
MAPx=mymalloc(SRAMIN,sizeof(MapperCommRes));
if(!MAPx)res=1;
break;
default:
break;
}
}
}
return res; //返回执行结果
}
//释放内存
void nes_sram_free(void)
{
myfree(SRAMIN,NES_RAM);
myfree(SRAMIN,NES_SRAM);
myfree(SRAMIN,RomHeader);
myfree(SRAMIN,NES_Mapper);
myfree(SRAMIN,spr_ram);
myfree(SRAMIN,ppu);
myfree(SRAMIN,apu);
myfree(SRAMIN,wave_buffers);
myfree(SRAMIN,i2sbuf1);
myfree(SRAMIN,i2sbuf2);
myfree(SRAMEX,romfile);
if((VROM_tiles!=VROM_banks)&&VROM_banks&&VROM_tiles)//如果分别为VROM_banks和VROM_tiles申请了内存,则释放
{
myfree(SRAMIN,VROM_banks);
myfree(SRAMEX,VROM_tiles);
}
switch (MapperNo)//释放map内存
{
case 1: //释放内存
myfree(SRAMIN,MAP1);
break;
case 4:
case 6:
case 16:
case 17:
case 18:
case 19:
case 21:
case 23:
case 24:
case 25:
case 64:
case 65:
case 67:
case 69:
case 85:
case 91://增加91
case 189:
myfree(SRAMIN,MAPx);break; //释放内存
default:break;
}
NES_RAM=0;
NES_SRAM=0;
RomHeader=0;
NES_Mapper=0;
spr_ram=0;
ppu=0;
apu=0;
wave_buffers=0;
i2sbuf1=0;
i2sbuf2=0;
romfile=0;
VROM_banks=0;
VROM_tiles=0;
MAP1=0;
MAPx=0;
}
[/mw_shl_code]
Mapper文件091.cpp修改如下
[mw_shl_code=c,true]
/////////////////////////////////////////////////////////////////////
// Mapper 91
void MAP91_Reset()
{
// set CPU bank pointers
// set_CPU_bank4(num_8k_ROM_banks-2);
// set_CPU_bank5(num_8k_ROM_banks-1);
// set_CPU_bank6(num_8k_ROM_banks-2);
// set_CPU_bank7(num_8k_ROM_banks-1);
// set PPU bank pointers
if(num_1k_VROM_banks)
{
set_PPU_banks(0,0,0,0,0,0,0,0);
}
}
void MAP91_MemoryWrite(uint16 addr, uint8 data)
{
switch(addr & 0xF00F)
{
case 0x6000:
{
set_PPU_bank0(data*2+0);
set_PPU_bank1(data*2+1);
}
break;
case 0x6001:
{
set_PPU_bank2(data*2+0);
set_PPU_bank3(data*2+1);
}
break;
case 0x6002:
{
set_PPU_bank4(data*2+0);
set_PPU_bank5(data*2+1);
}
break;
case 0x6003:
{
set_PPU_bank6(data*2+0);
set_PPU_bank7(data*2+1);
}
break;
case 0x7000:
{
set_CPU_bank4(data);
}
break;
case 0x7001:
{
set_CPU_bank5(data);
}
break;
case 0x7002:
{
MAPx->irq_counter = data;
}
break;
case 0x7003:
{
MAPx->irq_enabled = data;
}
break;
}
}
void MAP91_HSync(int scanline)
{
if(MAPx->irq_enabled)
{
if(0 <= scanline && scanline <= 240)
{
if(spr_enabled() || bg_enabled())
{
if(!MAPx->irq_counter)
{
MAPx->irq_enabled = 0;
CPU_IRQ;
}
else
{
MAPx->irq_counter--;
}
}
}
}
}
void MAP91_Init()
{
NES_Mapper->Reset = MAP91_Reset;
NES_Mapper->Write = MAP91_MemoryWrite;
NES_Mapper->HSync= MAP91_HSync;
}
/////////////////////////////////////////////////////////////////////
[/mw_shl_code]
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