535 lines
11 KiB
C
535 lines
11 KiB
C
#include "main.h"
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#include "stm32f4xx.h"
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#include "nes_main.h"
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#include "nes_ppu.h"
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#include "nes_mapper.h"
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#include "nes_apu.h"
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#include "mymem.h"
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#include "dac.h"
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#include "ff.h"
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#include "string.h"
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//////////////////////////////////////////////////////////////////////////////////
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//本程序移植自网友ye781205的NES模拟器工程
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//ALIENTEK STM32F407开发板
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//NES主函数 代码
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//正点原子@ALIENTEK
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//技术论坛:www.openedv.com
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//创建日期:2014/7/1
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//版本：V1.0
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//////////////////////////////////////////////////////////////////////////////////
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u8 nes_frame_cnt; //nes帧计数器
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int MapperNo; //map编号
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int NES_scanline; //nes扫描线
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int VROM_1K_SIZE;
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int VROM_8K_SIZE;
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u8 PADdata; //手柄1键值 [7:0]右7 左6 下5 上4 Start3 Select2 B1 A0
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u8 PADdata1; //手柄2键值 [7:0]右7 左6 下5 上4 Start3 Select2 B1 A0
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u8 *NES_RAM; //保持1024字节对齐
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u8 *NES_SRAM;
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NES_header *RomHeader; //rom文件头
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MAPPER *NES_Mapper;
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MapperCommRes *MAPx;
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u8* spr_ram; //精灵RAM,256字节
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ppu_data* ppu; //ppu指针
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u8* VROM_banks;
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u8* VROM_tiles;
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apu_t *apu; //apu指针
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u16 *wave_buffers;
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u16 *i2sbuf1; //音频缓冲帧,占用内存数 367*4 字节@22050Hz
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u16 *i2sbuf2; //音频缓冲帧,占用内存数 367*4 字节@22050Hz
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u8* romfile; //nes文件指针,指向整个nes文件的起始地址.
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//////////////////////////////////////////////////////////////////////////////////////
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//记录nes是否需要跳出
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static u8 g_nes_break=0;
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//加载ROM
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//返回值:0,成功
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// 1,内存错误
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// 3,map错误
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u8 nes_load_rom(void)
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{
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u8* p;
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u8 i;
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u8 res=0;
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p=(u8*)romfile;
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if(strncmp((char*)p,"NES",3)==0)
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{
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RomHeader->ctrl_z=p[3];
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RomHeader->num_16k_rom_banks=p[4];
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RomHeader->num_8k_vrom_banks=p[5];
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RomHeader->flags_1=p[6];
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RomHeader->flags_2=p[7];
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if(RomHeader->flags_1&0x04)p+=512; //有512字节的trainer:
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if(RomHeader->num_8k_vrom_banks>0) //存在VROM,进行预解码
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{
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VROM_banks=p+16+(RomHeader->num_16k_rom_banks*0x4000);
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#if NES_RAM_SPEED==1 //1:内存占用小 0:速度快
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VROM_tiles=VROM_banks;
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#else
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VROM_tiles=mymalloc(RomHeader->num_8k_vrom_banks*8*1024);//这里可能申请多达1MB内存!!!
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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
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compile(RomHeader->num_8k_vrom_banks*8*1024/16,VROM_banks,VROM_tiles);
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#endif
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}else
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{
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VROM_banks=mymalloc(8*1024);
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VROM_tiles=mymalloc(8*1024);
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if(!VROM_banks||!VROM_tiles)res=1;
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}
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VROM_1K_SIZE = RomHeader->num_8k_vrom_banks * 8;
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VROM_8K_SIZE = RomHeader->num_8k_vrom_banks;
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MapperNo=(RomHeader->flags_1>>4)|(RomHeader->flags_2&0xf0);
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if(RomHeader->flags_2 & 0x0E)MapperNo=RomHeader->flags_1>>4;//忽略高四位，如果头看起来很糟糕
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//printf("use map:%d\r\n",MapperNo);
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for(i=0;i<255;i++) // 查找支持的Mapper号
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{
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if (MapTab[i]==MapperNo)break;
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if (MapTab[i]==-1)res=3;
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}
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if(res==0)
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{
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switch(MapperNo)
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{
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case 1:
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MAP1=mymalloc(sizeof(Mapper1Res));
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if(!MAP1)res=1;
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break;
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case 4:
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case 6:
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case 16:
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case 17:
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case 18:
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case 19:
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case 21:
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case 23:
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case 24:
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case 25:
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case 64:
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case 65:
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case 67:
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case 69:
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case 85:
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case 189:
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MAPx=mymalloc(sizeof(MapperCommRes));
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if(!MAPx)res=1;
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break;
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default:
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break;
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}
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}
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}
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return res; //返回执行结果
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}
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//变量NES_RAM申请内存时的辅助指针
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void *nes_ram_alignment;
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//释放内存
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void nes_sram_free(void)
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{
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//myfree(NES_RAM);
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myfree(nes_ram_alignment);
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myfree(NES_SRAM);
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myfree(RomHeader);
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myfree(NES_Mapper);
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myfree(spr_ram);
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myfree(ppu);
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myfree(apu);
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myfree(wave_buffers);
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myfree(i2sbuf1);
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myfree(i2sbuf2);
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myfree(romfile);
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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
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{
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myfree(VROM_banks);
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myfree(VROM_tiles);
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}
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switch (MapperNo)//释放map内存
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{
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case 1: //释放内存
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myfree(MAP1);
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break;
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case 4:
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case 6:
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case 16:
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case 17:
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case 18:
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case 19:
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case 21:
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case 23:
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case 24:
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case 25:
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case 64:
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case 65:
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case 67:
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case 69:
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case 85:
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case 189:
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myfree(MAPx);break; //释放内存
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default:break;
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}
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NES_RAM=0;
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NES_SRAM=0;
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RomHeader=0;
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NES_Mapper=0;
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spr_ram=0;
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ppu=0;
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apu=0;
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wave_buffers=0;
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i2sbuf1=0;
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i2sbuf2=0;
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romfile=0;
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VROM_banks=0;
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VROM_tiles=0;
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MAP1=0;
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MAPx=0;
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}
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//为NES运行申请内存
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//romsize:nes文件大小
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//返回值:0,申请成功
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// 1,申请失败
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u8 nes_sram_malloc(u32 romsize)
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{
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u16 i=0;
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//NES_RAM需要0x800大小的内存，这里多申请0x400的内存，用于1024字节对齐
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nes_ram_alignment=mymalloc(0x800+0x400);
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NES_RAM=(void*)(((u32)nes_ram_alignment+0x400)&0xfffffc00);
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NES_SRAM=mymalloc(0X2000);
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RomHeader=mymalloc(sizeof(NES_header));
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NES_Mapper=mymalloc(sizeof(MAPPER));
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spr_ram=mymalloc(0X100);
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ppu=mymalloc(sizeof(ppu_data));
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apu=mymalloc(sizeof(apu_t)); //sizeof(apu_t)= 12588
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wave_buffers=mymalloc(APU_PCMBUF_SIZE*2);
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i2sbuf1=mymalloc(APU_PCMBUF_SIZE*4+10);
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i2sbuf2=mymalloc(APU_PCMBUF_SIZE*4+10);
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romfile=mymalloc(romsize); //申请游戏rom空间,等于nes文件大小
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if(i==64||!NES_RAM||!NES_SRAM||!RomHeader||!NES_Mapper||!spr_ram||!ppu||!apu||!wave_buffers||!i2sbuf1||!i2sbuf2||!romfile)
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{
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nes_sram_free();
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return 1;
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}
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memset(NES_SRAM,0,0X2000); //清零
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memset(RomHeader,0,sizeof(NES_header)); //清零
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memset(NES_Mapper,0,sizeof(MAPPER)); //清零
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memset(spr_ram,0,0X100); //清零
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memset(ppu,0,sizeof(ppu_data)); //清零
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memset(apu,0,sizeof(apu_t)); //清零
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memset(wave_buffers,0,APU_PCMBUF_SIZE*2);//清零
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memset(i2sbuf1,0,APU_PCMBUF_SIZE*4+10); //清零
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memset(i2sbuf2,0,APU_PCMBUF_SIZE*4+10); //清零
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memset(romfile,0,romsize); //清零
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return 0;
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}
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int nes_xoff=0; //显示在x轴方向的偏移量(实际显示宽度=256-2*nes_xoff)
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int nes_yoff=0;
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//开始nes游戏
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//pname:nes游戏路径
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//返回值:
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//0,正常退出
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//1,内存错误
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//2,文件错误
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//3,不支持的map
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u8 nes_load(u8* pname,void *lcd_addr,int x,int y)
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{
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nes_xoff=x;
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nes_yoff=y;
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FIL *file;
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FILINFO *file_info;
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UINT br;
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u8 res=0;
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// app_wm8978_volset(wm8978set.mvol);
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// WM8978_ADDA_Cfg(1,0); //开启DAC
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// WM8978_Input_Cfg(0,0,0);//关闭输入通道
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// WM8978_Output_Cfg(1,0); //开启DAC输出
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g_nes_break=0;
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file=mymalloc(sizeof(FIL));
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file_info= mymalloc(sizeof(FILINFO));
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if(file==0)return 1; //内存申请失败.
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res=f_stat((char*)pname,file_info);
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if(res!=FR_OK) //打开文件失败
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{
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myfree(file);
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myfree(file_info);
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return 2;
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}
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res=nes_sram_malloc(file_info->fsize); //申请内存
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if(res==0)
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{
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f_open(file,(char*)pname,FA_READ);
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f_read(file,romfile,file_info->fsize,&br); //读取nes文件
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res=nes_load_rom(); //加载ROM
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if(res==0)
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{
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Mapper_Init(); //map初始化
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cpu6502_init(); //初始化6502,并复位
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PPU_reset(lcd_addr); //ppu复位
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apu_init(); //apu初始化
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nes_sound_open(0,APU_SAMPLE_RATE); //初始化播放设备
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nes_emulate_frame(); //进入NES模拟器主循环
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nes_sound_close(); //关闭声音输出
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}
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}
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f_close(file);
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myfree(file);//释放内存
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myfree(file_info);
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nes_sram_free(); //释放内存
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return res;
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}
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//运行已经加载在内存中的游戏
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u8 nes_start(u8* file,int fileSize,void *lcd_addr,int x,int y)
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{
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nes_xoff=x;
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nes_yoff=y;
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u8 res=0;
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g_nes_break=0;
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res=nes_sram_malloc(fileSize); //申请内存
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if(res==0)
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{
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mymemcpy (romfile,file,fileSize);//复制一份在运行空间
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res=nes_load_rom(); //加载ROM
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if(res==0)
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{
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Mapper_Init(); //map初始化
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cpu6502_init(); //初始化6502,并复位
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PPU_reset(lcd_addr); //ppu复位
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apu_init(); //apu初始化
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nes_sound_open(0,APU_SAMPLE_RATE); //初始化播放设备
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nes_emulate_frame(); //进入NES模拟器主循环
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nes_sound_close(); //关闭声音输出
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}
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}
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nes_sram_free(); //释放内存
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return res;
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}
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//设置游戏显示窗口
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void nes_set_window(void)
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{
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}
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//读取游戏手柄数据
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void nes_get_gamepadval(void)
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{
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#include "usart.h"
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PADdata=USART3_GetKey();
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PADdata1=0;
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}
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//nes模拟器主循环
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void nes_emulate_frame(void)
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{
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u8 nes_frame;
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//TIM3_Int_Init(10000-1,8400-1);//启动TIM3 ,1s中断一次
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nes_set_window();//设置窗口
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while(1)
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{
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// LINES 0-239
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PPU_start_frame();
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//LCD_SwitchLayerBuff();//切换帧
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for(NES_scanline = 0; NES_scanline< 240; NES_scanline++)
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{
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run6502(113*256);
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NES_Mapper->HSync(NES_scanline);
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//扫描一行
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if(nes_frame==0)scanline_draw(NES_scanline);
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else do_scanline_and_dont_draw(NES_scanline);
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}
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//LCD_ExitLayerBuff ();
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NES_scanline=240;
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run6502(113*256);//运行1线
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NES_Mapper->HSync(NES_scanline);
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start_vblank();
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if(NMI_enabled())
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{
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cpunmi=1;
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run6502(7*256);//运行中断
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}
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NES_Mapper->VSync();
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// LINES 242-261
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for(NES_scanline=241;NES_scanline<262;NES_scanline++)
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{
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run6502(113*256);
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NES_Mapper->HSync(NES_scanline);
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}
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end_vblank();
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nes_get_gamepadval();//每3帧查询一次USB
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apu_soundoutput();//输出游戏声音
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nes_frame_cnt++;
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nes_frame++;
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if(nes_frame>NES_SKIP_FRAME)nes_frame=0;//跳帧
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u8 nesBreak (void);
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if (nesBreak()) break;
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if (Touch_GetState()->x[1]!=0) break;
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}
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//TIM3->CR1&=~(1<<0);//关闭定时器3
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}
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u8 nesBreak (void)
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{
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u8 t=0;
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if ((PADdata&0x0c)==0x0c)
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{
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g_nes_break=0x0c;
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}
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if ((g_nes_break)&&(t=USART3_GetKeyPressed(),t&0x0c))
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{
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g_nes_break&=~t;
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if (g_nes_break==0)
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return 1;
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}
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return 0;
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}
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//在6502.s里面被调用
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void debug_6502(u16 reg0,u8 reg1)
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{
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//printf("6502 error:%x,%d\r\n",reg0,reg1);
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}
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//////////////////////////////////////////////////////////////////////////////////
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//nes,音频输出支持部分
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static vu8 g_buff_Invalid=0; //数据无效时要重新填充数据
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static vu8 g_buff_useing; //当前DMA在使用哪个缓冲区
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static DAC_UserStruct g_dac;
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static void dma_tx_callback(DAC_UserStruct *dac)
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{
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u16 i;
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g_buff_useing=dac->buff_useing;
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g_buff_Invalid=1;
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}
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//NES打开音频输出
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int nes_sound_open(int samples_per_sync,int sample_rate)
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{
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//初始化DAC
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g_dac.buff1=(u32 *)i2sbuf1;
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g_dac.buff2=(u32 *)i2sbuf2;
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g_dac.buff_size=APU_PCMBUF_SIZE*4;
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g_dac.rate=RATE22050;
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g_dac.call_back=dma_tx_callback;
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DAC_NormalInit (&g_dac);
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return 1;
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}
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//NES关闭音频输出
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void nes_sound_close(void)
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{
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DAC_NormalDeInit (&g_dac);
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}
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//NES音频输出到I2S缓存
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void nes_apu_fill_buffer(int samples,u16* wavebuf)
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{
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if (DAC_GetDacHander()!=&g_dac) return;
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u16 i;
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u16 *p;
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while(g_buff_Invalid==0)//等待传输完成
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{
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rt_thread_delay(5);//
|
||
};
|
||
if(g_buff_useing==0)
|
||
{
|
||
p=(u16*)i2sbuf2;
|
||
}else
|
||
{
|
||
p=(u16*)i2sbuf1;
|
||
}
|
||
{
|
||
for(i=0;i<APU_PCMBUF_SIZE;i++)
|
||
{
|
||
p[2*i]=((wavebuf[i]+0x8000)>>4);
|
||
p[2*i+1]=p[2*i];
|
||
}
|
||
}
|
||
//填充了数据之后设置为有效
|
||
g_buff_Invalid=0;
|
||
}
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|