話不多說，上代碼

打開nes.main.c文件

添加如下代碼

u8 nesruning = 0; //初始化為真 u8 frame_cnt; //統計幀數 //u8 *rom_file; //NES游戲rom的存儲地址 //NES 幀周期循環 void NesFrameCycle(void) {int clocks; //CPU執行時間static int NES_time;//啟動模擬器循環，檢查VROM設置，若卡帶為0，初始化VROM//if ( NesHeader.byVRomSize == 0)//設置VROM存儲區位置。frame_cnt = 0;nesruning = 1;while (nesruning){//scanline: 0~19 VBANK 段，若PPU使能NMI，將產生NMI 中斷frame_cnt++;//幀計數器SpriteHitFlag = 0;for (PPU_scanline = 0; PPU_scanline < 20; PPU_scanline++){exec6502(CLOCKS_PER_SCANLINE);}//scanline: 20, PPU加載設置，執行一次空的掃描時間exec6502(CLOCKS_PER_SCANLINE);//NesHBCycle(); //水平周期PPU_scanline++; //20++PPU_Reg.NES_R2 &= ~R2_SPR0_HIT;//scanline: 21~261for (; PPU_scanline < SCAN_LINE_DISPALY_END_NUM; PPU_scanline++){if ((SpriteHitFlag == 1) && ((PPU_Reg.NES_R2 & R2_SPR0_HIT) == 0)){clocks = sprite[0].x * CLOCKS_PER_SCANLINE / NES_DISP_WIDTH;exec6502(clocks); //需重點優化PPU_Reg.NES_R2 |= R2_SPR0_HIT;exec6502(CLOCKS_PER_SCANLINE - clocks);}else exec6502(CLOCKS_PER_SCANLINE); //耗時大戶if (PPU_Reg.NES_R1 & (R1_BG_VISIBLE | R1_SPR_VISIBLE)) //若為假，關閉顯示{if (SpriteHitFlag == 0)NES_GetSpr0HitFlag(PPU_scanline - SCAN_LINE_DISPALY_START_NUM);//查找Sprite #0 碰撞標志}if ((frame_cnt % 3) == 0) //每3幀顯示一次 //耗時大戶{NES_time = micros() ;NES_RenderLine(PPU_scanline - SCAN_LINE_DISPALY_START_NUM);//水平同步與顯示一行printf("%d\n", micros() - NES_time);}}//scanline: 262 完成一幀exec6502(CLOCKS_PER_SCANLINE);PPU_Reg.NES_R2 |= R2_VBlank_Flag;//設置VBANK 標志//若使能PPU VBANK中斷，則設置VBANKif (PPU_Reg.NES_R0 & R0_VB_NMI_EN){NMI_Flag = SET1;//完成一幀掃描，產生NMI中斷}//設置幀IRQ標志，同步計數器，APU等//A mapper function in V-Sync 存儲器切換垂直VBANK同步//MapperVSync();//讀取控制器JoyPad狀態,更新JoyPad控制器值*///NES_JoyPadUpdateValue(); //systick 中斷讀取按鍵值//單獨的返回鍵（KEY6）掃描程序// if(KEY_Scan_f())break; //退出 //退出模擬器} }

同時找到如下代碼

printf("\r\n 開始申請內存\n");res = nes_mem_creat(); //申請內存if (res == 0) //申請成功了.則運行游戲{printf("\r\n 開始申請成功\n");printf("\r\n 初始化6502\n");LCD_tft_init(); //初始化顯示設備PPU_Init(((u8 *)&rom_file[offset + 0x10] + (neshreader->romnum * 0x4000)),(neshreader->romfeature & 0x01)); //PPU_初始化key_init(); //初始化獲取按鍵值設備adc_init(); //初始化獲取方向值設備NES_JoyPadInit(); //初始化模擬手柄printf("\r\n 無限循環執行游戲\n");printf("\r\n 按下退出游戲鍵\n");}else printf("\r\n 開始申請失敗\n");nes_mem_delete();//釋放內存return res; }

改為

printf("\r\n 開始申請內存\n");res = nes_mem_creat(); //申請內存if (res == 0) //申請成功了.則運行游戲{printf("\r\n 開始申請成功\n");init6502mem(0, //exp_rom 0, //sram 由卡類型決定, 暫不支持 ((u8 *)&rom_file[offset + 0x10]), //prg_rombank, 存儲器大小 由卡類型決定 neshreader->romnum); reset6502(); //初始化6502存儲器鏡像LCD_tft_init(); //初始化顯示設備PPU_Init(((u8 *)&rom_file[offset + 0x10] + (neshreader->romnum * 0x4000)),(neshreader->romfeature & 0x01)); //PPU_初始化key_init(); //初始化獲取按鍵值設備adc_init(); //初始化獲取方向值設備NES_JoyPadInit(); //初始化模擬手柄NesFrameCycle();//模擬器循環執行 printf("\r\n 按下退出游戲鍵\n");}else printf("\r\n 開始申請失敗\n");nes_mem_delete();//釋放內存return res; }

同時找到

//CPU使用u8 *ram6502; //RAM 2K字節,由malloc申請 portMUX_TYPE isr_nes_creat = portMUX_INITIALIZER_UNLOCKED;//開辟nes運行所需的RAM. //返回值:0,成功; // 其他,錯誤代碼. u8 nes_mem_creat(void) {portENTER_CRITICAL_ISR(&isr_nes_creat);ram6502 = (u8 *)malloc(2048); //申請2K內存if (ram6502 == NULL)return 1; //申請失敗NameTable = (u8 *)malloc(2048); //申請2K內存if (NameTable == NULL)return 2;Buffer_scanline = (u16 *)malloc((8 + 256 + 8) * 2);if (Buffer_scanline == NULL)return 3;portEXIT_CRITICAL_ISR(&isr_nes_creat);return 0; }

刪掉

//CPU使用u8 *ram6502; //RAM 2K字節,由malloc申請

然后在頭文件添加

#include "6502.h"

編譯通過即可

至此，NES模擬器就此完結，完整資源鏈接為：

下面貼出6502.c和6502.h文件

#include "6502.h"//6502標志位 flags = NVRBDIZC #define C_FLAG 0x01 // 1: Carry #define Z_FLAG 0x02 // 1: Zero #define I_FLAG 0x04 // 1: Irq disabled #define D_FLAG 0x08 // 1: Decimal mode flag (NES unused) #define B_FLAG 0x10 // 1: Break #define R_FLAG 0x20 // 1: Reserved (Always 1) #define V_FLAG 0x40 // 1: Overflow #define N_FLAG 0x80 // 1: Negative// flags = NVRBDIZC BYTE a_reg,x_reg,y_reg,flag_reg,s_reg; WORD pc_reg = 0;//中斷標志 CPU_InitFlag NMI_Flag; CPU_InitFlag IRQ_Flag;// Macros for convenience #define A a_reg #define X x_reg #define Y y_reg #define P flag_reg #define S s_reg #define PC pc_reg//internal registers BYTE opcode; int clockticks6502;//help variables WORD savepc; BYTE value; int sum,saveflags; WORD help;//6502 memory map u8 *ram6502; //RAM 2K字節,由malloc申請 //u8* ppu_regbase; // PPU IO reg //u8* apu_regbase; // APU IO reg u8* exp_rom; // expansion rom u8* sram; // sram u8* prg_rombank0; // prg-rom lower bank u8* prg_rombank1; // prg-rom upper bank // arrays typedef struct {unsigned short int ticks;void (*instruction)(void);//指令void (*adrmode)(void); // }OPCODE;const OPCODE opcodetable[]= { /*0x00*/ {7, brk6502, implied6502}, /*0x01*/ {6, ora6502, indx6502}, /*0x02*/ {2, nop6502, implied6502}, /*0x03*/ {2, nop6502, implied6502}, /*0x04*/ {3, tsb6502, zp6502}, /*0x05*/ {3, ora6502, zp6502}, /*0x06*/ {5, asl6502, zp6502}, /*0x07*/ {2, nop6502, implied6502}, /*0x08*/ {3, php6502, implied6502}, /*0x09*/ {3, ora6502, immediate6502}, /*0x0A*/ {2, asla6502, implied6502}, /*0x0B*/ {2, ora6502, implied6502}, /*0x0C*/ {4, tsb6502, abs6502}, /*0x0D*/ {4, ora6502, abs6502}, /*0x0E*/ {6, asl6502, abs6502}, /*0x0F*/ {2, nop6502, implied6502},/*0x10*/ {2, bpl6502, relative6502}, /*0x11*/ {5, ora6502, indy6502}, /*0x12*/ {3, ora6502, indzp6502}, /*0x13*/ {2, nop6502, implied6502}, /*0x14*/ {3, trb6502, zp6502}, /*0x15*/ {4, ora6502, zpx6502}, /*0x16*/ {6, asl6502, zpx6502}, /*0x17*/ {2, nop6502, implied6502}, /*0x18*/ {2, clc6502, implied6502}, /*0x19*/ {4, ora6502, absy6502}, /*0x1A*/ {2, ina6502, implied6502}, /*0x1B*/ {2, nop6502, implied6502}, /*0x1C*/ {4, trb6502, abs6502}, /*0x1D*/ {4, ora6502, absx6502}, /*0x1E*/ {7, asl6502, absx6502}, /*0x1F*/ {2, nop6502, implied6502},/*0x20*/ {6, jsr6502, abs6502}, /*0x21*/ {6, and6502, indx6502}, /*0x22*/ {2, nop6502, implied6502}, /*0x23*/ {2, nop6502, implied6502}, /*0x24*/ {3, bit6502, zp6502}, /*0x25*/ {3, and6502, zp6502}, /*0x26*/ {5, rol6502, zp6502}, /*0x27*/ {2, nop6502, implied6502}, /*0x28*/ {4, plp6502, implied6502}, /*0x29*/ {3, and6502, immediate6502}, /*0x2A*/ {2, rola6502, implied6502}, /*0x2B*/ {2, nop6502, implied6502}, /*0x2C*/ {4, bit6502, abs6502}, /*0x2D*/ {4, and6502, abs6502}, /*0x2E*/ {6, rol6502, abs6502}, /*0x2F*/ {2, nop6502, implied6502},/*0x30*/ {2, bmi6502, relative6502}, /*0x31*/ {5, and6502, indy6502}, /*0x32*/ {3, and6502, indzp6502}, /*0x33*/ {2, nop6502, implied6502}, /*0x34*/ {4, bit6502, zpx6502}, /*0x35*/ {4, and6502, zpx6502}, /*0x36*/ {6, rol6502, zpx6502}, /*0x37*/ {2, nop6502, implied6502}, /*0x38*/ {2, sec6502, implied6502}, /*0x39*/ {4, and6502, absy6502}, /*0x3A*/ {2, dea6502, implied6502}, /*0x3B*/ {2, nop6502, implied6502}, /*0x3C*/ {4, bit6502, absx6502}, /*0x3D*/ {4, and6502, absx6502}, /*0x3E*/ {7, rol6502, absx6502}, /*0x3F*/ {2, nop6502, implied6502},/*0x40*/ {6, rti6502, implied6502}, /*0x41*/ {6, eor6502, indx6502}, /*0x42*/ {2, nop6502, implied6502}, /*0x43*/ {2, nop6502, implied6502}, /*0x44*/ {2, nop6502, implied6502}, /*0x45*/ {3, eor6502, zp6502}, /*0x46*/ {5, lsr6502, zp6502}, /*0x47*/ {2, nop6502, implied6502}, /*0x48*/ {3, pha6502, implied6502}, /*0x49*/ {3, eor6502, immediate6502}, /*0x4A*/ {2, lsra6502, implied6502}, /*0x4B*/ {2, nop6502, implied6502}, /*0x4C*/ {3, jmp6502, abs6502}, /*0x4D*/ {4, eor6502, abs6502}, /*0x4E*/ {6, lsr6502, abs6502}, /*0x4F*/ {2, nop6502, implied6502},/*0x50*/ {2, bvc6502, relative6502}, /*0x51*/ {5, eor6502, indy6502}, /*0x52*/ {3, eor6502, indzp6502}, /*0x53*/ {2, nop6502, implied6502}, /*0x54*/ {2, nop6502, implied6502}, /*0x55*/ {4, eor6502, zpx6502}, /*0x56*/ {6, lsr6502, zpx6502}, /*0x57*/ {2, nop6502, implied6502}, /*0x58*/ {2, cli6502, implied6502}, /*0x59*/ {4, eor6502, absy6502}, /*0x5A*/ {3, phy6502, implied6502}, /*0x5B*/ {2, nop6502, implied6502}, /*0x5C*/ {2, nop6502, implied6502}, /*0x5D*/ {4, eor6502, absx6502}, /*0x5E*/ {7, lsr6502, absx6502}, /*0x5F*/ {2, nop6502, implied6502},/*0x60*/ {6, rts6502, implied6502}, /*0x61*/ {6, adc6502, indx6502}, /*0x62*/ {2, nop6502, implied6502}, /*0x63*/ {2, nop6502, implied6502}, /*0x64*/ {3, stz6502, zp6502}, /*0x65*/ {3, adc6502, zp6502}, /*0x66*/ {5, ror6502, zp6502}, /*0x67*/ {2, nop6502, implied6502}, /*0x68*/ {4, pla6502, implied6502}, /*0x69*/ {3, adc6502, immediate6502}, /*0x6A*/ {2, rora6502, implied6502}, /*0x6B*/ {2, nop6502, implied6502}, /*0x6C*/ {5, jmp6502, indirect6502}, /*0x6D*/ {4, adc6502, abs6502}, /*0x6E*/ {6, ror6502, abs6502}, /*0x6F*/ {2, nop6502, implied6502},/*0x70*/ {2, bvs6502, implied6502}, /*0x71*/ {5, adc6502, indy6502}, /*0x72*/ {3, adc6502, indzp6502}, /*0x73*/ {2, nop6502, implied6502}, /*0x74*/ {4, stz6502, zpx6502}, /*0x75*/ {4, adc6502, zpx6502}, /*0x76*/ {6, ror6502, zpx6502}, /*0x77*/ {2, nop6502, implied6502}, /*0x78*/ {2, sei6502, implied6502}, /*0x79*/ {4, adc6502, absy6502}, /*0x7A*/ {4, ply6502, implied6502}, /*0x7B*/ {2, nop6502, implied6502}, /*0x7C*/ {6, jmp6502, indabsx6502}, /*0x7D*/ {4, adc6502, absx6502}, /*0x7E*/ {7, ror6502, absx6502}, /*0x7F*/ {2, nop6502, implied6502},/*0x80*/ {2, bra6502, relative6502}, /*0x81*/ {6, sta6502, indx6502}, /*0x82*/ {2, nop6502, implied6502}, /*0x83*/ {2, nop6502, implied6502}, /*0x84*/ {2, sty6502, zp6502}, /*0x85*/ {2, sta6502, zp6502}, /*0x86*/ {2, stx6502, zp6502}, /*0x87*/ {2, nop6502, implied6502}, /*0x88*/ {2, dey6502, implied6502}, /*0x89*/ {2, bit6502, immediate6502}, /*0x8A*/ {2, txa6502, implied6502}, /*0x8B*/ {2, nop6502, implied6502}, /*0x8C*/ {4, sty6502, abs6502}, /*0x8D*/ {4, sta6502, abs6502}, /*0x8E*/ {4, stx6502, abs6502}, /*0x8F*/ {2, nop6502, implied6502},/*0x90*/ {2, bcc6502, relative6502}, /*0x91*/ {6, sta6502, indy6502}, /*0x92*/ {3, sta6502, indzp6502}, /*0x93*/ {2, nop6502, implied6502}, /*0x94*/ {4, sty6502, zpx6502}, /*0x95*/ {4, sta6502, zpx6502}, /*0x96*/ {4, stx6502, zpy6502}, /*0x97*/ {2, nop6502, implied6502}, /*0x98*/ {2, tya6502, implied6502}, /*0x99*/ {5, sta6502, absy6502}, /*0x9A*/ {2, txs6502, implied6502}, /*0x9B*/ {2, nop6502, implied6502}, /*0x9C*/ {4, stz6502, abs6502}, /*0x9D*/ {5, sta6502, absx6502}, /*0x9E*/ {5, stz6502, absx6502}, /*0x9F*/ {2, nop6502, implied6502},/*0xA0*/ {3, ldy6502, immediate6502}, /*0xA1*/ {6, lda6502, indx6502}, /*0xA2*/ {3, ldx6502, immediate6502}, /*0xA3*/ {2, nop6502, implied6502}, /*0xA4*/ {3, ldy6502, zp6502}, /*0xA5*/ {3, lda6502, zp6502}, /*0xA6*/ {3, ldx6502, zp6502}, /*0xA7*/ {2, nop6502, implied6502}, /*0xA8*/ {2, tay6502, implied6502}, /*0xA9*/ {3, lda6502, immediate6502}, /*0xAA*/ {2, tax6502, implied6502}, /*0xAB*/ {2, nop6502, implied6502}, /*0xAC*/ {4, ldy6502, abs6502}, /*0xAD*/ {4, lda6502, abs6502}, /*0xAE*/ {4, ldx6502, abs6502}, /*0xAF*/ {2, nop6502, implied6502},/*0xB0*/ {2, bcs6502, relative6502}, /*0xB1*/ {5, lda6502, indy6502}, /*0xB2*/ {3, lda6502, indzp6502}, /*0xB3*/ {2, nop6502, implied6502}, /*0xB4*/ {4, ldy6502, zpx6502}, /*0xB5*/ {4, lda6502, zpx6502}, /*0xB6*/ {4, ldx6502, zpy6502}, /*0xB7*/ {2, nop6502, implied6502}, /*0xB8*/ {2, clv6502, implied6502}, /*0xB9*/ {4, lda6502, absy6502}, /*0xBA*/ {2, tsx6502, implied6502}, /*0xBB*/ {2, nop6502, implied6502}, /*0xBC*/ {4, ldy6502, absx6502}, /*0xBD*/ {4, lda6502, absx6502}, /*0xBE*/ {4, ldx6502, absy6502}, /*0xBF*/ {2, nop6502, implied6502},/*0xC0*/ {3, cpy6502, immediate6502}, /*0xC1*/ {6, cmp6502, indx6502}, /*0xC2*/ {2, nop6502, implied6502}, /*0xC3*/ {2, nop6502, implied6502}, /*0xC4*/ {3, cpy6502, zp6502}, /*0xC5*/ {3, cmp6502, zp6502}, /*0xC6*/ {5, dec6502, zp6502}, /*0xC7*/ {2, nop6502, implied6502}, /*0xC8*/ {2, iny6502, implied6502}, /*0xC9*/ {3, cmp6502, immediate6502}, /*0xCA*/ {2, dex6502, implied6502}, /*0xCB*/ {2, nop6502, implied6502}, /*0xCC*/ {4, cpy6502, abs6502}, /*0xCD*/ {4, cmp6502, abs6502}, /*0xCE*/ {6, dec6502, abs6502}, /*0xCF*/ {2, nop6502, implied6502},/*0xD0*/ {2, bne6502, relative6502}, /*0xD1*/ {5, cmp6502, indy6502}, /*0xD2*/ {3, cmp6502, indzp6502}, /*0xD3*/ {2, nop6502, implied6502}, /*0xD4*/ {2, nop6502, implied6502}, /*0xD5*/ {4, cmp6502, zpx6502}, /*0xD6*/ {6, dec6502, zpx6502}, /*0xD7*/ {2, nop6502, implied6502}, /*0xD8*/ {2, cld6502, implied6502}, /*0xD9*/ {4, cmp6502, absy6502}, /*0xDA*/ {3, phx6502, implied6502}, /*0xDB*/ {2, nop6502, implied6502}, /*0xDC*/ {2, nop6502, implied6502}, /*0xDD*/ {4, cmp6502, absx6502}, /*0xDE*/ {7, dec6502, absx6502}, /*0xDF*/ {2, nop6502, implied6502},/*0xE0*/ {3, cpx6502, immediate6502}, /*0xE1*/ {6, sbc6502, indx6502}, /*0xE2*/ {2, nop6502, implied6502}, /*0xE3*/ {2, nop6502, implied6502}, /*0xE4*/ {3, cpx6502, zp6502}, /*0xE5*/ {3, sbc6502, zp6502}, /*0xE6*/ {5, inc6502, zp6502}, /*0xE7*/ {2, nop6502, implied6502}, /*0xE8*/ {2, inx6502, implied6502}, /*0xE9*/ {3, sbc6502, immediate6502}, /*0xEA*/ {2, nop6502, implied6502}, /*0xEB*/ {2, nop6502, implied6502}, /*0xEC*/ {4, cpx6502, abs6502}, /*0xED*/ {4, sbc6502, abs6502}, /*0xEE*/ {6, inc6502, abs6502}, /*0xEF*/ {2, nop6502, implied6502},/*0xF0*/ {2, beq6502, relative6502}, /*0xF1*/ {5, sbc6502, indy6502}, /*0xF2*/ {3, sbc6502, indzp6502}, /*0xF3*/ {2, nop6502, implied6502}, /*0xF4*/ {2, nop6502, implied6502}, /*0xF5*/ {4, sbc6502, zpx6502}, /*0xF6*/ {6, inc6502, zpx6502}, /*0xF7*/ {2, nop6502, implied6502}, /*0xF8*/ {2, sed6502, implied6502}, /*0xF9*/ {4, sbc6502, absy6502}, /*0xFA*/ {4, plx6502, implied6502}, /*0xFB*/ {2, nop6502, implied6502}, /*0xFC*/ {2, nop6502, implied6502}, /*0xFD*/ {4, sbc6502, absx6502}, /*0xFE*/ {7, inc6502, absx6502}, /*0xFF*/ {2, nop6502, implied6502} };// //6502 存儲器鏡像讀寫 ////sprite DMA (寫地址到$4014, 左移8位，原數據地址) void SprDMA(BYTE scr_addr) //scr_addr 為高8位地址 {u8 *scr_addrptr = 0; //將傳送sprite數據 指針int i; switch(scr_addr >> 4)//選擇源地址數據區域{ case 0x0: //RAMcase 0x1: scr_addrptr = &ram6502[(scr_addr << 8)];break;case 0x6: //SRAMcase 0x7: #ifdef CHECK_POINTERcheck_pointer(sram); #endifscr_addrptr = sram + ((scr_addr << 8) - 0x6000);break;case 0x8: //程序存儲器 只讀 case 0x9:case 0xA:case 0xB:#ifdef CHECK_POINTERcheck_pointer(prg_rombank0); #endifscr_addrptr = &prg_rombank0[(scr_addr << 8) - 0x8000];break;case 0xC:case 0xD:case 0xE:case 0xF:#ifdef CHECK_POINTERcheck_pointer(prg_rombank1); #endifscr_addrptr = &prg_rombank1[(scr_addr << 8) - 0xC000];break;} #ifdef CKECK_POINTERif(scr_addrptr == NULL){printf("\r\nSprite ram DMA 地址參數錯誤！");return;} #endif for(i=0; i<256; i++){Spr_Mem.spr_ram[i] = scr_addrptr[i];} //每次傳輸，需要512 cycles (about 4.5 scanlines worth) clockticks6502 -= 512;//花掉512CPU時鐘周期 }//讀取6502存儲器 int get6502memory(WORD addr)//沒0x2000遞增 {switch(addr & 0xE000){case 0x0000: //$0000 ~ $0FFF return (ram6502[addr&0x7FF]);case 0x1000: //$1000 ~ $1FFF 鏡像return (ram6502[addr&0x7FF]);case 0x2000: //$2000 ~ $2FFFreturn PPU_RegRead(addr&0x7); //PPU IO接口 //case 0x3000: //$3000 ~ $3FFF 鏡像//break;case 0x4000://$4000 ~ $4FFF //暫不處理//APU 聲音處理 IO接口 擴展ROM //if(addr < 0x4013)return (apu_regbase[addr&0x1F]); //暫不處理 //if(addr == 0x4014){SpriteRAM_DMA();break;} //只支持寫 //if(addr == 0x4015);//pAPU Sound / Vertical Clock Signal Register if(addr == 0x4016){return NES_GetJoyPadVlaue(JOYPAD_0)|0x40;//分為3段8bit數據，第一段8bit為控制器1,第二段控制器3，第三段ID code}if(addr == 0x4017){return NES_GetJoyPadVlaue2(JOYPAD_0);//分為3段8bit數據，第一段8bit為控制器2,第二段控制器4，第三段ID code}break;//case 0x5000:// expansion rom*///#ifdef CKECK_POINTER// check_pointer(exp_rom); //#endif// return (exp_rom[addr - 0x4020]);case 0x6000://卡帶SRAM，一般用來存儲游戲進度 #ifdef CKECK_POINTERcheck_pointer(ram6502); #endif//暫不處理 break;case 0x8000://程序存儲器 只讀 case 0xA000:#ifdef CHECK_POINTERcheck_pointer(prg_rombank0); #endifreturn prg_rombank0[addr-0x8000];case 0xC000:case 0xE000:#ifdef CHECK_POINTERcheck_pointer(prg_rombank1); #endifreturn prg_rombank1[addr-0xC000]; } return (addr >> 8);//通常不會執行到此處,返回地址高八位//APU和SRAM未完成，可能執行到此處*/ }//寫6502存儲器 void put6502memory(WORD addr, BYTE value) {switch(addr & 0xE000){case 0x0000:ram6502[addr&0x7FF] = value;break;case 0x2000://PPU IO接口 PPU_RegWrite(addr&0x7, value);break;case 0x4000: //APU 聲音處理 IO接口 擴展ROM if(addr == 0x4014)SprDMA(value); //value 為將要傳送的數據地址的高八位 if(addr == 0x4016){ //bit0 JoyPad 控制 if(value & 1)//先寫bit0:1復位按鍵狀態，在寫bit0:0禁止{ NES_JoyPadReset();}else NES_JoyPadDisable(); }//其他位暫未使用 //if(addr == 0x4017)NES_SetJoyPad(value); //if(addr >= 0x4020){// exp_rom[addr - 0x6000] = value;// }//其余寄存器暫未處理break;case 0x6000://卡帶SRAM，一般用來存儲游戲進度*///#ifdef CHECK_POINTER// check_pointer(sram); //#endif// sram[addr - 0x6000] = value; //與存儲器切換有關 break;case 0x8000: //程序存儲器 只讀(寫入時與存儲器切換(mapper)有關，暫略) case 0xA000:case 0xC000:case 0xE000://Write to Mapper//MapperWrite( wAddr, byData );break;} } // //尋址模式 ////Adressing modes //Implied void implied6502(void) { }//#Immediate void immediate6502(void) {savepc=PC++; } //ABS void abs6502(void) { //savepc = gameImage[PC] + (gameImage[PC + 1] << 8);savepc=get6502memory(PC)+(get6502memory(PC+1) << 8); PC+=2; } //Branch void relative6502(void) {//savepc = gameImage[PC++];savepc = get6502memory(PC++); if(savepc & 0x80)savepc-=0x100;if((savepc>>8)!=(PC>>8))clockticks6502++; } //(ABS) void indirect6502(void) {//help = gameImage[PC] + (gameImage[PC + 1] << 8);//savepc = gameImage[help] + (gameImage[help + 1] << 8);help = get6502memory(PC)+(get6502memory(PC+1) << 8);savepc = get6502memory(help)+(get6502memory(help+1) << 8); PC+=2; } //ABS,X void absx6502(void) {//savepc = gameImage[PC] + (gameImage[PC + 1] << 8);savepc=get6502memory(PC)+(get6502memory(PC+1) << 8); PC+=2;if(opcodetable[opcode].ticks==4)if ((savepc>>8) != ((savepc+X)>>8))clockticks6502++; savepc += X; } // ABS,Y void absy6502(void) {//savepc = gameImage[PC] + (gameImage[PC + 1] << 8);savepc = get6502memory(PC)+(get6502memory(PC+1) << 8);PC+=2; if (opcodetable[opcode].ticks==4)if ((savepc>>8) != ((savepc+Y)>>8))clockticks6502++; savepc += Y; } //ZP void zp6502(void) {//savepc=gameImage[PC++];savepc = get6502memory(PC);PC++; }/* ZP,X */ void zpx6502(void) { // savepc=gameImage[PC++]+X;savepc = get6502memory(PC) + X;PC++;savepc &= 0x00ff; }//ZP,Y void zpy6502(void) {//savepc=gameImage[PC++]+Y;savepc = get6502memory(PC) + Y;PC++; savepc &= 0x00ff; } //(ZP,X) void indx6502(void) {//value = gameImage[PC++]+X;//savepc = gameImage[value] + (gameImage[value+1] << 8);value = get6502memory(PC) + Y;PC++; savepc = get6502memory(value)+(get6502memory(value + 1) << 8); }//(ZP),Y void indy6502(void) {//value = gameImage[PC++];//savepc = gameImage[value] + (gameImage[value+1] << 8);value = get6502memory(PC);PC++;savepc = get6502memory(value)+(get6502memory(value + 1) << 8); if (opcodetable[opcode].ticks==5)if ((savepc>>8) != ((savepc+Y)>>8))clockticks6502++; savepc += Y; }/* (ABS,X) */ void indabsx6502(void) {//help = gameImage[PC] + (gameImage[PC + 1] << 8) + X;//savepc = gameImage[help] + (gameImage[help + 1] << 8);help = get6502memory(PC)+((get6502memory(PC+1) << 8) +X); savepc = get6502memory(help)+(get6502memory(help + 1) << 8); }//(ZP) void indzp6502(void) {//value = gameImage[PC++];//savepc = gameImage[value] + (gameImage[value + 1] << 8);value = get6502memory(PC);PC++;savepc = get6502memory(value)+( get6502memory(value + 1) << 8 ); }// //指令 ////Instructions void adc6502(void) {opcodetable[opcode].adrmode(); value = get6502memory(savepc); saveflags=(P & 0x01);sum= ((char) A) + ((char) value) + saveflags;if ((sum>0x7f) || (sum<-0x80)) P |= 0x40; else P &= 0xbf;sum= A + value + saveflags;if (sum>0xff) P |= 0x01; else P &= 0xfe;A=sum;if (P & 0x08){P &= 0xfe;if ((A & 0x0f)>0x09)A += 0x06; if ((A & 0xf0)>0x90){A += 0x60;P |= 0x01;}}else clockticks6502++; if (A) P &= 0xfd; else P |= 0x02;if (A & 0x80) P |= 0x80; else P &= 0x7f; }void and6502(void) {opcodetable[opcode].adrmode(); value = get6502memory(savepc); A &= value;if (A) P &= 0xfd; else P |= 0x02;if (A & 0x80) P |= 0x80; else P &= 0x7f; }void asl6502(void) {opcodetable[opcode].adrmode();value = get6502memory(savepc);P= (P & 0xfe) | ((value >>7) & 0x01);value = value << 1;put6502memory(savepc,value);if (value) P &= 0xfd; else P |= 0x02;if (value & 0x80) P |= 0x80; else P &= 0x7f; }void asla6502(void) {P= (P & 0xfe) | ((A >>7) & 0x01);A = A << 1;if (A) P &= 0xfd; else P |= 0x02;if (A & 0x80) P |= 0x80;else P &= 0x7f; }void bcc6502(void) {if ((P & 0x01)==0){opcodetable[opcode].adrmode();PC += savepc;clockticks6502++;}else value = get6502memory(PC++); }void bcs6502(void) {if (P & 0x01){opcodetable[opcode].adrmode();PC += savepc;clockticks6502++;}else value = get6502memory(PC++); }void beq6502(void) {if (P & 0x02){opcodetable[opcode].adrmode();PC += savepc;clockticks6502++;}else value = get6502memory(PC++); }void bit6502(void) {opcodetable[opcode].adrmode();value = get6502memory(savepc); //non-destrucive logically And between value and the accumulator//and set zero flag if (value & A) P &= 0xfd; else P |= 0x02; //set negative and overflow flags from value P = (P & 0x3f) | (value & 0xc0); }void bmi6502(void) {if (P & 0x80){opcodetable[opcode].adrmode();PC += savepc;clockticks6502++;}else value = get6502memory(PC++); }void bne6502(void) {if ((P & 0x02)==0){opcodetable[opcode].adrmode();PC += savepc;clockticks6502++;}else value = get6502memory(PC++); }void bpl6502(void) {if ((P & 0x80)==0) {opcodetable[opcode].adrmode();PC += savepc;clockticks6502++;}else value = get6502memory(PC++); }void brk6502(void) {PC++;put6502memory(0x0100+S--,(BYTE)(PC>>8));put6502memory(0x0100+S--,(BYTE)(PC & 0xff));put6502memory(0x0100+S--,P);P |= 0x14;PC = get6502memory(0xFFFE) + (get6502memory(0xFFFF) << 8); }void bvc6502(void) {if ((P & 0x40)==0){opcodetable[opcode].adrmode();PC += savepc;clockticks6502++;}else value = get6502memory(PC++); }void bvs6502(void) {if (P & 0x40){opcodetable[opcode].adrmode();PC += savepc;clockticks6502++;}else value = get6502memory(PC++); }void clc6502(void) {P &= 0xfe; }void cld6502(void) {P &= 0xf7; }void cli6502(void) {P &= 0xfb; }void clv6502(void) {P &= 0xbf; }void cmp6502(void) {opcodetable[opcode].adrmode();value = get6502memory(savepc);if (A+0x100-value>0xff) P |= 0x01; else P &= 0xfe;value=A+0x100-value;if (value) P &= 0xfd; else P |= 0x02;if (value & 0x80) P |= 0x80; else P &= 0x7f; }void cpx6502(void) {opcodetable[opcode].adrmode();value = get6502memory(savepc);if (X+0x100-value>0xff) P |= 0x01; else P &= 0xfe;value=X+0x100-value;if (value) P &= 0xfd; else P |= 0x02;if (value & 0x80) P |= 0x80; else P &= 0x7f; }void cpy6502(void) {opcodetable[opcode].adrmode();value = get6502memory(savepc);if (Y+0x100-value>0xff) P |= 0x01; else P &= 0xfe;value=Y+0x100-value;if (value) P &= 0xfd; else P |= 0x02;if (value & 0x80) P |= 0x80; else P &= 0x7f; }void dec6502(void) {u8 temp; opcodetable[opcode].adrmode(); temp = get6502memory(savepc);temp--;put6502memory(savepc, temp); value = get6502memory(savepc);if (value) P &= 0xfd; else P |= 0x02;if (value & 0x80) P |= 0x80; else P &= 0x7f; }void dex6502(void) {X--;if (X) P &= 0xfd; else P |= 0x02;if (X & 0x80) P |= 0x80; else P &= 0x7f; }void dey6502(void) {Y--;if (Y) P &= 0xfd; else P |= 0x02;if (Y & 0x80) P |= 0x80; else P &= 0x7f; }void eor6502(void) {opcodetable[opcode].adrmode(); A ^= get6502memory(savepc);if (A) P &= 0xfd; else P |= 0x02;if (A & 0x80) P |= 0x80; else P &= 0x7f; }void inc6502(void) {u8 temp; opcodetable[opcode].adrmode(); //gameImage[savepc]++;temp = get6502memory(savepc);temp++;put6502memory(savepc,temp); value = get6502memory(savepc);if (value) P &= 0xfd; else P |= 0x02;if (value & 0x80) P |= 0x80; else P &= 0x7f; }void inx6502(void) {X++;if (X) P &= 0xfd; else P |= 0x02;if (X & 0x80) P |= 0x80; else P &= 0x7f; }void iny6502(void) {Y++;if (Y) P &= 0xfd; else P |= 0x02;if (Y & 0x80) P |= 0x80; else P &= 0x7f; }void jmp6502(void) {opcodetable[opcode].adrmode();PC=savepc; }void jsr6502(void) {PC++;put6502memory(0x0100+S--,(BYTE)(PC >> 8));put6502memory(0x0100+S--,(BYTE)(PC & 0xff));PC--;opcodetable[opcode].adrmode();PC=savepc; }void lda6502(void) {opcodetable[opcode].adrmode();A = get6502memory(savepc);// set the zero flagif (A) P &= 0xfd; else P |= 0x02;// set the negative flagif (A & 0x80) P |= 0x80; else P &= 0x7f; }void ldx6502(void) {opcodetable[opcode].adrmode();X = get6502memory(savepc);if (X) P &= 0xfd; else P |= 0x02;if (X & 0x80) P |= 0x80;else P &= 0x7f; }void ldy6502(void) {opcodetable[opcode].adrmode();Y = get6502memory(savepc);if (Y) P &= 0xfd; else P |= 0x02;if (Y & 0x80) P |= 0x80; else P &= 0x7f; }void lsr6502(void) {opcodetable[opcode].adrmode();value = get6502memory(savepc); //set carry flag if shifting right causes a bit to be lost P= (P & 0xfe) | (value & 0x01);value = value >>1;put6502memory(savepc,value);//set zero flag if value is zero if (value != 0) P &= 0xfd; else P |= 0x02; //set negative flag if bit 8 set??? can this happen on an LSR? if ((value & 0x80) == 0x80)P |= 0x80; else P &= 0x7f; }void lsra6502(void) {P= (P & 0xfe) | (A & 0x01);A = A >>1;if (A) P &= 0xfd; else P |= 0x02;if (A & 0x80) P |= 0x80; else P &= 0x7f; }void nop6502(void) { }void ora6502(void) {opcodetable[opcode].adrmode();A |= get6502memory(savepc); if (A) P &= 0xfd; else P |= 0x02;if (A & 0x80) P |= 0x80; else P &= 0x7f; }void pha6502(void) {put6502memory(0x100 + S-- , A); }void php6502(void) {put6502memory(0x100 + S--, P); }void pla6502(void) {A = get6502memory(++S + 0x100);if (A) P &= 0xfd; else P |= 0x02;if (A & 0x80) P |= 0x80; else P &= 0x7f; }void plp6502(void) {P = get6502memory(++S + 0x100) | 0x20; }void rol6502(void) {saveflags=(P & 0x01);opcodetable[opcode].adrmode();value = get6502memory(savepc);P= (P & 0xfe) | ((value >>7) & 0x01);value = value << 1;value |= saveflags;put6502memory(savepc,value);if (value) P &= 0xfd; else P |= 0x02;if (value & 0x80) P |= 0x80; else P &= 0x7f; }void rola6502(void) {saveflags=(P & 0x01);P= (P & 0xfe) | ((A >>7) & 0x01);A = A << 1;A |= saveflags;if (A) P &= 0xfd; else P |= 0x02;if (A & 0x80) P |= 0x80; else P &= 0x7f; }void ror6502(void) {saveflags=(P & 0x01);opcodetable[opcode].adrmode();value = get6502memory(savepc);P= (P & 0xfe) | (value & 0x01);value = value >>1;if (saveflags) value |= 0x80;put6502memory(savepc,value);if (value) P &= 0xfd; else P |= 0x02;if (value & 0x80) P |= 0x80; else P &= 0x7f; }void rora6502(void) {saveflags=(P & 0x01);P= (P & 0xfe) | (A & 0x01);A = A >>1;if (saveflags) A |= 0x80;if (A) P &= 0xfd; else P |= 0x02;if (A & 0x80) P |= 0x80; else P &= 0x7f; }void rti6502(void) { P = get6502memory(++S + 0x100)|0X20;PC = get6502memory(++S + 0x100);PC |= (get6502memory(++S + 0x100) << 8); }void rts6502(void) { PC = get6502memory(++S + 0x100);PC |= (get6502memory(++S + 0x100) << 8);PC++; }void sbc6502(void) {opcodetable[opcode].adrmode();value = get6502memory(savepc) ^ 0xFF;saveflags=(P & 0x01);sum= ((char) A) + ((char) value) + (saveflags << 4);if ((sum>0x7f) || (sum<-0x80)) P |= 0x40; else P &= 0xbf;sum= A + value + saveflags;if (sum>0xff) P |= 0x01; else P &= 0xfe;A=sum;if (P & 0x08){A -= 0x66; P &= 0xfe;if ((A & 0x0f)>0x09)A += 0x06; if ((A & 0xf0)>0x90){A += 0x60;P |= 0x01;}}else clockticks6502++; if (A) P &= 0xfd; else P |= 0x02;if (A & 0x80) P |= 0x80; else P &= 0x7f; }void sec6502(void) {P |= 0x01; }void sed6502(void) {P |= 0x08; }void sei6502(void) {P |= 0x04; }void sta6502(void) {opcodetable[opcode].adrmode();put6502memory(savepc,A); }void stx6502(void) {opcodetable[opcode].adrmode();put6502memory(savepc,X); }void sty6502(void) {opcodetable[opcode].adrmode();put6502memory(savepc,Y); }void tax6502(void) {X=A;if (X) P &= 0xfd; else P |= 0x02;if (X & 0x80) P |= 0x80; else P &= 0x7f; }void tay6502(void) {Y=A;if (Y) P &= 0xfd; else P |= 0x02;if (Y & 0x80) P |= 0x80; else P &= 0x7f; }void tsx6502(void) {X=S;if (X) P &= 0xfd; else P |= 0x02;if (X & 0x80) P |= 0x80; else P &= 0x7f; }void txa6502(void) {A=X;if (A) P &= 0xfd; else P |= 0x02;if (A & 0x80) P |= 0x80; else P &= 0x7f; }void txs6502(void) {S=X; }void tya6502(void) {A=Y;if (A) P &= 0xfd; else P |= 0x02;if (A & 0x80) P |= 0x80; else P &= 0x7f; }void bra6502(void) {opcodetable[opcode].adrmode();PC += savepc;clockticks6502++; }void dea6502(void) {A--;if (A) P &= 0xfd; else P |= 0x02;if (A & 0x80) P |= 0x80; else P &= 0x7f; }void ina6502(void) {A++;if (A) P &= 0xfd; else P |= 0x02;if (A & 0x80) P |= 0x80; else P &= 0x7f; }void phx6502(void) {put6502memory(0x100+S--,X); }void plx6502(void) { X = get6502memory(++S + 0x100);if (X) P &= 0xfd; else P |= 0x02;if (X & 0x80) P |= 0x80; else P &= 0x7f; }void phy6502(void) {put6502memory(0x100+S--, Y); }void ply6502(void) {Y = get6502memory(++S + 0x100); if (Y) P &= 0xfd; else P |= 0x02;if (Y & 0x80) P |= 0x80; else P &= 0x7f; }void stz6502(void) {opcodetable[opcode].adrmode();put6502memory(savepc,0); }void tsb6502(void) {u8 temp; opcodetable[opcode].adrmode();temp = get6502memory(savepc);temp |= A;put6502memory(savepc, temp);if(get6502memory(savepc))P &= 0xfd; else P |= 0x02; }void trb6502(void) {u8 temp; opcodetable[opcode].adrmode();temp = get6502memory(savepc);temp &= (A ^ 0xFF);put6502memory(savepc, temp); if(get6502memory(savepc))P &= 0xfd; else P |= 0x02; }// // CPU復位與中斷處理 ////Reset CPU void reset6502(void) {A=X=Y=P=0;P |= 0x20; //Z_FLAG | R_FLAGS=0xff;//PC = get6502memory(0xfffc & addrmask);//PC |= get6502memory(0xfffd & addrmask) << 8;PC = get6502memory(0xfffc); //復位地址，從中讀取PCPC |= get6502memory(0xfffd) << 8;NMI_Flag = CLR0;IRQ_Flag = CLR0; }//Non maskerable interrupt void nmi6502(void) {put6502memory(0x0100+S--,(BYTE)(PC>>8));put6502memory(0x0100+S--,(BYTE)(PC & 0xff));put6502memory(0x0100+S--,P);P |= 0x04; PC=get6502memory(0xfffa);PC |= get6502memory(0xfffb) << 8; }// Maskerable Interrupt void irq6502(void) {put6502memory(0x0100+S--,(BYTE)(PC>>8));put6502memory(0x0100+S--,(BYTE)(PC & 0xff));put6502memory(0x0100+S--,P);P |= 0x04; PC=get6502memory(0xfffe);PC |= get6502memory(0xffff) << 8; }// //執行指令 ////Execute Instruction void exec6502(int timerTicks) { // while (timerTicks > 0) // { // // fetch instructionopcode = gameImage[PC++]; // opcode = get6502memory(PC); // PC++; // // // execute instruction 用函數指針替代Switch改進執行效率的方法 // opcodetable[opcode].instruction(); // // // calculate clock cycles // clockticks6502 += opcodetable[opcode].ticks; // timerTicks -= clockticks6502; // clockticks6502 = 0; // }//中斷檢測 if(NMI_Flag == SET1){nmi6502();NMI_Flag = CLR0;}else{if(IRQ_Flag == SET1 && !(P & I_FLAG)){irq6502();IRQ_Flag = CLR0;}} while (timerTicks > clockticks6502) {opcode = get6502memory(PC); //讀取6502存儲器PC++;opcodetable[opcode].instruction();clockticks6502 += opcodetable[opcode].ticks;}clockticks6502 -= timerTicks; }//初始化6502 存儲器 void init6502mem( u8* exp_romptr,u8* sramptr, u8* prg_rombank0ptr, u8 rom_num) {exp_rom = exp_romptr; //expansion rom sram = sramptr; //sram prg_rombank0= prg_rombank0ptr; //prg-rom lower bank prg_rombank1= prg_rombank0ptr +(0x4000*(rom_num-1));// prg-rom upper bank clockticks6502 = 0; }

#ifndef _6502_H_ #define _6502_H_ #include "type.h" #include "PPU.h" #include "joypad.h"//Address mask. Atari Asteroids/Deluxe use 0x7fff - //but use 0xffff for full 16 bit decode //CPU中斷標志 typedef enum {CLR0 = 0, SET1 = !CLR0} CPU_InitFlag;extern CPU_InitFlag NMI_Flag; extern CPU_InitFlag NMI_Flag; //存儲器指針 extern u8* prg_rombank0; //prg-rom lower bank extern u8* prg_rombank1; //prg-rom upper bank //指令解釋 void implied6502(void); void immediate6502(void); void abs6502(void); void relative6502(void); void indirect6502(void); void absx6502(void); void absy6502(void); void zp6502(void); void zpx6502(void); void zpy6502(void); void indx6502(void); void indy6502(void); void indabsx6502(void); void indzp6502(void); void adc6502(void); void and6502(void); void asl6502(void); void asla6502(void); void bcc6502(void); void bcs6502(void); void beq6502(void); void bit6502(void); void bmi6502(void); void bne6502(void); void bpl6502(void); void brk6502(void); void bvc6502(void); void bvs6502(void); void clc6502(void); void cld6502(void); void cli6502(void); void clv6502(void); void cmp6502(void); void cpx6502(void); void cpy6502(void); void dec6502(void); void dex6502(void); void dey6502(void); void eor6502(void); void inc6502(void); void inx6502(void); void iny6502(void); void jmp6502(void); void jsr6502(void); void lda6502(void); void ldx6502(void); void ldy6502(void); void lsr6502(void); void lsra6502(void); void nop6502(void); void ora6502(void); void pha6502(void); void php6502(void); void pla6502(void); void plp6502(void); void rol6502(void); void rola6502(void); void ror6502(void); void rora6502(void); void rti6502(void); void rts6502(void); void sbc6502(void); void sec6502(void); void sed6502(void); void sei6502(void); void sta6502(void); void stx6502(void); void sty6502(void); void tax6502(void); void tay6502(void); void tsx6502(void); void txa6502(void); void txs6502(void); void tya6502(void); void bra6502(void); void dea6502(void); void ina6502(void); void phx6502(void); void plx6502(void); void phy6502(void); void ply6502(void); void stz6502(void); void tsb6502(void); void trb6502(void);//Non maskerable interrupt void nmi6502(void);//不可屏蔽中斷//Maskerable Interrupt void irq6502(void);//可屏蔽中斷//must be called first to initialise all 6502 engines arrays //初始化CPU RAM void init6502mem( u8* exp_romptr,u8* sramptr, u8* prg_rombank0ptr, u8 rom_num);//sets all of the 6502 registers. The program counter is set from //locations $FFFC and $FFFD masked with the above addrmask void reset6502(void);//run the 6502 engine for specified number of clock cycles void exec6502(int timerTicks);#endif

總結

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