player/Project/Src/NES/nes_main.c

#include "main.h"
#include "stm32f4xx.h" 
#include "nes_main.h" 
#include "nes_ppu.h"
#include "nes_mapper.h"
#include "nes_apu.h"
#include "mymem.h"
#include "dac.h"

#include "ff.h"
#include "string.h"
//////////////////////////////////////////////////////////////////////////////////	 
//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֲ<EFBFBD><D6B2><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ye781205<30><35>NESģ<53><C4A3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
//ALIENTEK STM32F407<30><37><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
//NES<45><53><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD>	   
//<2F><><EFBFBD><EFBFBD>ԭ<EFBFBD><D4AD>@ALIENTEK
//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>̳:www.openedv.com
//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>:2014/7/1
//<2F>汾<EFBFBD><E6B1BE>V1.0  			  
////////////////////////////////////////////////////////////////////////////////// 	 
 

u8 nes_frame_cnt;		//nes֡<73><D6A1><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 
int MapperNo;			//map<61><70><EFBFBD><EFBFBD>
int NES_scanline;		//nesɨ<73><C9A8><EFBFBD><EFBFBD>
int VROM_1K_SIZE;
int VROM_8K_SIZE;

u8 PADdata;   			//<2F>ֱ<EFBFBD>1<EFBFBD><31>ֵ [7:0]<5D><>7 <20><>6 <20><>5 <20><>4 Start3 Select2 B1 A0  
u8 PADdata1;   			//<2F>ֱ<EFBFBD>2<EFBFBD><32>ֵ [7:0]<5D><>7 <20><>6 <20><>5 <20><>4 Start3 Select2 B1 A0  
u8 *NES_RAM;			//<2F><><EFBFBD><EFBFBD>1024<32>ֽڶ<D6BD><DAB6><EFBFBD>
u8 *NES_SRAM;  
NES_header *RomHeader; 	//rom<6F>ļ<EFBFBD>ͷ
MAPPER *NES_Mapper;		 
MapperCommRes *MAPx;  


u8* spr_ram;			//<2F><><EFBFBD><EFBFBD>RAM,256<35>ֽ<EFBFBD>
ppu_data* ppu;			//ppuָ<75><D6B8>
u8* VROM_banks;
u8* VROM_tiles;

apu_t *apu; 			//apuָ<75><D6B8>
u16 *wave_buffers; 		
u16 *i2sbuf1; 			//<2F><>Ƶ<EFBFBD><C6B5><EFBFBD><EFBFBD>֡,ռ<><D5BC><EFBFBD>ڴ<EFBFBD><DAB4><EFBFBD> 367*4 <20>ֽ<EFBFBD>@22050Hz
u16 *i2sbuf2; 			//<2F><>Ƶ<EFBFBD><C6B5><EFBFBD><EFBFBD>֡,ռ<><D5BC><EFBFBD>ڴ<EFBFBD><DAB4><EFBFBD> 367*4 <20>ֽ<EFBFBD>@22050Hz

u8* romfile;			//nes<65>ļ<EFBFBD>ָ<EFBFBD><D6B8>,ָ<><D6B8><EFBFBD><EFBFBD><EFBFBD><EFBFBD>nes<65>ļ<EFBFBD><C4BC><EFBFBD><EFBFBD><EFBFBD>ʼ<EFBFBD><CABC>ַ.
//////////////////////////////////////////////////////////////////////////////////////

//<2F><>¼nes<65>Ƿ<EFBFBD><C7B7><EFBFBD>Ҫ<EFBFBD><D2AA><EFBFBD><EFBFBD>
static u8 g_nes_break=0;



 
//<2F><><EFBFBD><EFBFBD>ROM
//<2F><><EFBFBD><EFBFBD>ֵ:0,<2C>ɹ<EFBFBD>
//    1,<2C>ڴ<EFBFBD><DAB4><EFBFBD><EFBFBD><EFBFBD>
//    3,map<61><70><EFBFBD><EFBFBD>
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;		//<2F><>512<31>ֽڵ<D6BD>trainer:
		if(RomHeader->num_8k_vrom_banks>0)		//<2F><><EFBFBD><EFBFBD>VROM,<2C><><EFBFBD><EFBFBD>Ԥ<EFBFBD><D4A4><EFBFBD><EFBFBD>
		{		
			VROM_banks=p+16+(RomHeader->num_16k_rom_banks*0x4000);
#if	NES_RAM_SPEED==1	//1:<3A>ڴ<EFBFBD>ռ<EFBFBD><D5BC>С 0:<3A>ٶȿ<D9B6>	 
			VROM_tiles=VROM_banks;	 
#else  
			VROM_tiles=mymalloc(RomHeader->num_8k_vrom_banks*8*1024);//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>1MB<4D>ڴ<EFBFBD>!!!
			if(VROM_tiles==0)VROM_tiles=VROM_banks;//<2F>ڴ治<DAB4><E6B2BB><EFBFBD>õ<EFBFBD><C3B5><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>,<2C><><EFBFBD><EFBFBD>VROM_titles<65><73>VROM_banks<6B><73><EFBFBD><EFBFBD><EFBFBD>ڴ<EFBFBD>			
			compile(RomHeader->num_8k_vrom_banks*8*1024/16,VROM_banks,VROM_tiles);  
#endif	
		}else 
		{
			VROM_banks=mymalloc(8*1024);
			VROM_tiles=mymalloc(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;//<2F><><EFBFBD>Ը<EFBFBD><D4B8><EFBFBD>λ<EFBFBD><CEBB><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͷ<EFBFBD><CDB7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 
		//printf("use map:%d\r\n",MapperNo);
		for(i=0;i<255;i++)  // <20><><EFBFBD><EFBFBD>֧<EFBFBD>ֵ<EFBFBD>Mapper<65><72>
		{		
			if (MapTab[i]==MapperNo)break;		
			if (MapTab[i]==-1)res=3; 
		} 
		if(res==0)
		{
			switch(MapperNo)
			{
				case 1:  
					MAP1=mymalloc(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 189:
					MAPx=mymalloc(sizeof(MapperCommRes)); 
					if(!MAPx)res=1;
					break;  
				default:
					break;
			}
		}
	} 
	return res;	//<2F><><EFBFBD><EFBFBD>ִ<EFBFBD>н<EFBFBD><D0BD><EFBFBD>
} 
//<2F><><EFBFBD><EFBFBD>NES_RAM<41><4D><EFBFBD><EFBFBD><EFBFBD>ڴ<EFBFBD>ʱ<EFBFBD>ĸ<EFBFBD><C4B8><EFBFBD>ָ<EFBFBD><D6B8>
void *nes_ram_alignment;
//<2F>ͷ<EFBFBD><CDB7>ڴ<EFBFBD> 
void nes_sram_free(void)
{ 
	//myfree(NES_RAM);		
	myfree(nes_ram_alignment);		
	myfree(NES_SRAM);	
	myfree(RomHeader);	
	myfree(NES_Mapper);
	myfree(spr_ram);		
	myfree(ppu);	
	myfree(apu);	
	myfree(wave_buffers);	
	myfree(i2sbuf1);	
	myfree(i2sbuf2);	 
	myfree(romfile);	  
	if((VROM_tiles!=VROM_banks)&&VROM_banks&&VROM_tiles)//<2F><><EFBFBD><EFBFBD><EFBFBD>ֱ<EFBFBD>ΪVROM_banks<6B><73>VROM_tiles<65><73><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڴ<EFBFBD>,<2C><><EFBFBD>ͷ<EFBFBD>
	{
		myfree(VROM_banks);
		myfree(VROM_tiles);		 
	}
	switch (MapperNo)//<2F>ͷ<EFBFBD>map<61>ڴ<EFBFBD>
	{
		case 1: 			//<2F>ͷ<EFBFBD><CDB7>ڴ<EFBFBD>
			myfree(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 189:
			myfree(MAPx);break;	 		//<2F>ͷ<EFBFBD><CDB7>ڴ<EFBFBD> 
		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;
} 
//ΪNES<45><53><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڴ<EFBFBD>
//romsize:nes<65>ļ<EFBFBD><C4BC><EFBFBD>С
//<2F><><EFBFBD><EFBFBD>ֵ:0,<2C><><EFBFBD><EFBFBD><EFBFBD>ɹ<EFBFBD>
//       1,<2C><><EFBFBD><EFBFBD>ʧ<EFBFBD><CAA7>
u8 nes_sram_malloc(u32 romsize)
{
	u16 i=0;
	
	//NES_RAM<41><4D>Ҫ0x800<30><30>С<EFBFBD><D0A1><EFBFBD>ڴ棬<DAB4><E6A3AC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>0x400<30><30><EFBFBD>ڴ棬<DAB4><E6A3AC><EFBFBD><EFBFBD>1024<32>ֽڶ<D6BD><DAB6><EFBFBD>
	nes_ram_alignment=mymalloc(0x800+0x400);
	NES_RAM=(void*)(((u32)nes_ram_alignment+0x400)&0xfffffc00);
	
 	NES_SRAM=mymalloc(0X2000);
	RomHeader=mymalloc(sizeof(NES_header));
	NES_Mapper=mymalloc(sizeof(MAPPER));
	spr_ram=mymalloc(0X100);		
	ppu=mymalloc(sizeof(ppu_data));  
	apu=mymalloc(sizeof(apu_t));		//sizeof(apu_t)=  12588
	wave_buffers=mymalloc(APU_PCMBUF_SIZE*2);
	i2sbuf1=mymalloc(APU_PCMBUF_SIZE*4+10);
	i2sbuf2=mymalloc(APU_PCMBUF_SIZE*4+10);
 	romfile=mymalloc(romsize);			//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϸrom<6F>ռ<EFBFBD>,<2C><><EFBFBD><EFBFBD>nes<65>ļ<EFBFBD><C4BC><EFBFBD>С 
	if(i==64||!NES_RAM||!NES_SRAM||!RomHeader||!NES_Mapper||!spr_ram||!ppu||!apu||!wave_buffers||!i2sbuf1||!i2sbuf2||!romfile)
	{
		nes_sram_free();
		return 1;
	}
	memset(NES_SRAM,0,0X2000);				//<2F><><EFBFBD><EFBFBD>
	memset(RomHeader,0,sizeof(NES_header));	//<2F><><EFBFBD><EFBFBD>
	memset(NES_Mapper,0,sizeof(MAPPER));	//<2F><><EFBFBD><EFBFBD>
	memset(spr_ram,0,0X100);				//<2F><><EFBFBD><EFBFBD>
	memset(ppu,0,sizeof(ppu_data));			//<2F><><EFBFBD><EFBFBD>
	memset(apu,0,sizeof(apu_t));			//<2F><><EFBFBD><EFBFBD>
	memset(wave_buffers,0,APU_PCMBUF_SIZE*2);//<2F><><EFBFBD><EFBFBD>
	memset(i2sbuf1,0,APU_PCMBUF_SIZE*4+10);	//<2F><><EFBFBD><EFBFBD>
	memset(i2sbuf2,0,APU_PCMBUF_SIZE*4+10);	//<2F><><EFBFBD><EFBFBD>
	memset(romfile,0,romsize);				//<2F><><EFBFBD><EFBFBD> 
	return 0;
} 














int nes_xoff=0;	//<2F><>ʾ<EFBFBD><CABE>x<EFBFBD>᷽<EFBFBD><E1B7BD><EFBFBD><EFBFBD>ƫ<EFBFBD><C6AB><EFBFBD><EFBFBD>(ʵ<><CAB5><EFBFBD><EFBFBD>ʾ<EFBFBD><CABE><EFBFBD><EFBFBD>=256-2*nes_xoff)
int nes_yoff=0;



//<2F><>ʼnes<65><73>Ϸ
//pname:nes<65><73>Ϸ·<CFB7><C2B7>
//<2F><><EFBFBD><EFBFBD>ֵ:
//0,<2C><><EFBFBD><EFBFBD><EFBFBD>˳<EFBFBD>
//1,<2C>ڴ<EFBFBD><DAB4><EFBFBD><EFBFBD><EFBFBD>
//2,<2C>ļ<EFBFBD><C4BC><EFBFBD><EFBFBD><EFBFBD>
//3,<2C><>֧<EFBFBD>ֵ<EFBFBD>map 
u8 nes_load(u8* pname,void *lcd_addr,int x,int y)
{
	nes_xoff=x;
	nes_yoff=y;
	FIL *file;
	FILINFO 	*file_info;
	UINT br;
	u8 res=0;  
//	app_wm8978_volset(wm8978set.mvol);	 
//	WM8978_ADDA_Cfg(1,0);	//<2F><><EFBFBD><EFBFBD>DAC
//	WM8978_Input_Cfg(0,0,0);//<2F>ر<EFBFBD><D8B1><EFBFBD><EFBFBD><EFBFBD>ͨ<EFBFBD><CDA8>
//	WM8978_Output_Cfg(1,0);	//<2F><><EFBFBD><EFBFBD>DAC<41><43><EFBFBD><EFBFBD>
	g_nes_break=0;
	file=mymalloc(sizeof(FIL)); 
	file_info=	mymalloc(sizeof(FILINFO)); 
	if(file==0)return 1;						//<2F>ڴ<EFBFBD><DAB4><EFBFBD><EFBFBD><EFBFBD>ʧ<EFBFBD><CAA7>.  
	
	res=f_stat((char*)pname,file_info);
	if(res!=FR_OK)	//<2F><><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD>ʧ<EFBFBD><CAA7>
	{
		myfree(file);
		myfree(file_info);
		return 2;
	}	 
	res=nes_sram_malloc(file_info->fsize);			//<2F><><EFBFBD><EFBFBD><EFBFBD>ڴ<EFBFBD> 
	if(res==0)
	{
		f_open(file,(char*)pname,FA_READ);
		f_read(file,romfile,file_info->fsize,&br);	//<2F><>ȡnes<65>ļ<EFBFBD>
		res=nes_load_rom();						//<2F><><EFBFBD><EFBFBD>ROM
		if(res==0) 					
		{   
			Mapper_Init();						//map<61><70>ʼ<EFBFBD><CABC>
			cpu6502_init();						//<2F><>ʼ<EFBFBD><CABC>6502,<2C><><EFBFBD><EFBFBD>λ	  	 
			PPU_reset(lcd_addr);						//ppu<70><75>λ
			apu_init(); 						//apu<70><75>ʼ<EFBFBD><CABC> 
			nes_sound_open(0,APU_SAMPLE_RATE);	//<2F><>ʼ<EFBFBD><CABC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>豸
			nes_emulate_frame();				//<2F><><EFBFBD><EFBFBD>NESģ<53><C4A3><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ѭ<EFBFBD><D1AD> 
			nes_sound_close();					//<2F>ر<EFBFBD><D8B1><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
		}
	}
	f_close(file);
	myfree(file);//<2F>ͷ<EFBFBD><CDB7>ڴ<EFBFBD>
	myfree(file_info);
	nes_sram_free();	//<2F>ͷ<EFBFBD><CDB7>ڴ<EFBFBD>
	return res;
}  







//<2F><><EFBFBD><EFBFBD><EFBFBD>Ѿ<EFBFBD><D1BE><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڴ<EFBFBD><DAB4>е<EFBFBD><D0B5><EFBFBD>Ϸ
u8 nes_start(u8* file,int fileSize,void *lcd_addr,int x,int y)
{
	nes_xoff=x;
	nes_yoff=y;
	u8 res=0;  
	g_nes_break=0;
	res=nes_sram_malloc(fileSize);			//<2F><><EFBFBD><EFBFBD><EFBFBD>ڴ<EFBFBD> 
	
	if(res==0)
	{
		mymemcpy (romfile,file,fileSize);//<2F><><EFBFBD><EFBFBD>һ<EFBFBD><D2BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>пռ<D0BF>
		res=nes_load_rom();						//<2F><><EFBFBD><EFBFBD>ROM
		if(res==0) 					
		{   
			Mapper_Init();						//map<61><70>ʼ<EFBFBD><CABC>
			cpu6502_init();						//<2F><>ʼ<EFBFBD><CABC>6502,<2C><><EFBFBD><EFBFBD>λ	  	 
			PPU_reset(lcd_addr);						//ppu<70><75>λ
			apu_init(); 						//apu<70><75>ʼ<EFBFBD><CABC> 
			nes_sound_open(0,APU_SAMPLE_RATE);	//<2F><>ʼ<EFBFBD><CABC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>豸
			nes_emulate_frame();				//<2F><><EFBFBD><EFBFBD>NESģ<53><C4A3><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ѭ<EFBFBD><D1AD> 
			nes_sound_close();					//<2F>ر<EFBFBD><D8B1><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
		}
	}
	nes_sram_free();	//<2F>ͷ<EFBFBD><CDB7>ڴ<EFBFBD>
	return res;
}  











//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϸ<EFBFBD><CFB7>ʾ<EFBFBD><CABE><EFBFBD><EFBFBD>
void nes_set_window(void)
{	
}
//<2F><>ȡ<EFBFBD><C8A1>Ϸ<EFBFBD>ֱ<EFBFBD><D6B1><EFBFBD><EFBFBD><EFBFBD>
void nes_get_gamepadval(void)
{  
#include "usart.h"
		PADdata=USART3_GetKey();
		PADdata1=0; 
}    
//nesģ<73><C4A3><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ѭ<EFBFBD><D1AD>
void nes_emulate_frame(void)
{  
	u8 nes_frame;
	//TIM3_Int_Init(10000-1,8400-1);//<2F><><EFBFBD><EFBFBD>TIM3 ,1s<31>ж<EFBFBD>һ<EFBFBD><D2BB>	
	nes_set_window();//<2F><><EFBFBD>ô<EFBFBD><C3B4><EFBFBD>
	while(1)
	{	
		// LINES 0-239
		PPU_start_frame();
		//LCD_SwitchLayerBuff();//<2F>л<EFBFBD>֡
		for(NES_scanline = 0; NES_scanline< 240; NES_scanline++)
		{
			run6502(113*256);
			NES_Mapper->HSync(NES_scanline);
			//ɨ<><C9A8>һ<EFBFBD><D2BB>		  
			if(nes_frame==0)scanline_draw(NES_scanline);
			else do_scanline_and_dont_draw(NES_scanline); 
		}
		//LCD_ExitLayerBuff ();
		
		NES_scanline=240;
		run6502(113*256);//<2F><><EFBFBD><EFBFBD>1<EFBFBD><31>
		NES_Mapper->HSync(NES_scanline); 
		start_vblank(); 
		if(NMI_enabled()) 
		{
			cpunmi=1;
			run6502(7*256);//<2F><><EFBFBD><EFBFBD><EFBFBD>ж<EFBFBD>
		}
		NES_Mapper->VSync();
		// LINES 242-261    
		for(NES_scanline=241;NES_scanline<262;NES_scanline++)
		{
			run6502(113*256);	  
			NES_Mapper->HSync(NES_scanline);		  
		}	   
		end_vblank(); 
		nes_get_gamepadval();//ÿ3֡<33><D6A1>ѯһ<D1AF><D2BB>USB
		apu_soundoutput();//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϸ<EFBFBD><CFB7><EFBFBD><EFBFBD>	 
		nes_frame_cnt++; 	
		nes_frame++;
		if(nes_frame>NES_SKIP_FRAME)nes_frame=0;//<2F><>֡ 
		u8 nesBreak (void);
		if (nesBreak()) break;
		if (Touch_GetState()->x[1]!=0) break;
	}
	//TIM3->CR1&=~(1<<0);//<2F>رն<D8B1>ʱ<EFBFBD><CAB1>3
}




u8 nesBreak (void)
{
	u8 t=0;
	if ((PADdata&0x0c)==0x0c)
	{
		g_nes_break=0x0c;
	}
	if ((g_nes_break)&&(t=USART3_GetKeyPressed(),t&0x0c))
	{
		g_nes_break&=~t;
		if (g_nes_break==0)
			return 1;
	}
	return 0;
}







//<2F><>6502.s<><73><EFBFBD>汻<EFBFBD><E6B1BB><EFBFBD><EFBFBD>
void debug_6502(u16 reg0,u8 reg1)
{
	//printf("6502 error:%x,%d\r\n",reg0,reg1);
}



////////////////////////////////////////////////////////////////////////////////// 	 
//nes,<2C><>Ƶ<EFBFBD><C6B5><EFBFBD><EFBFBD>֧<EFBFBD>ֲ<EFBFBD><D6B2><EFBFBD>



static vu8 g_buff_Invalid=0;		//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ЧʱҪ<CAB1><D2AA><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
static vu8 g_buff_useing;				//<2F><>ǰDMA<4D><41>ʹ<EFBFBD><CAB9><EFBFBD>ĸ<EFBFBD><C4B8><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
static DAC_UserStruct g_dac;



static void dma_tx_callback(DAC_UserStruct *dac) 
{    
	u16 i;
	g_buff_useing=dac->buff_useing;
	g_buff_Invalid=1;	
} 





//NES<45><53><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƶ<EFBFBD><C6B5><EFBFBD><EFBFBD>
int nes_sound_open(int samples_per_sync,int sample_rate) 
{
	
	//<2F><>ʼ<EFBFBD><CABC>DAC
	g_dac.buff1=(u32 *)i2sbuf1;
	g_dac.buff2=(u32 *)i2sbuf2;
	g_dac.buff_size=APU_PCMBUF_SIZE*4;
	g_dac.rate=RATE22050;
	g_dac.call_back=dma_tx_callback;
	DAC_NormalInit (&g_dac);
	return 1;
}
//NES<45>ر<EFBFBD><D8B1><EFBFBD>Ƶ<EFBFBD><C6B5><EFBFBD><EFBFBD>
void nes_sound_close(void) 
{ 
	DAC_NormalDeInit (&g_dac);
} 
//NES<45><53>Ƶ<EFBFBD><C6B5><EFBFBD><EFBFBD><EFBFBD><EFBFBD>I2S<32><53><EFBFBD><EFBFBD>
void nes_apu_fill_buffer(int samples,u16* wavebuf)
{	
	
	if (DAC_GetDacHander()!=&g_dac) return;
	u16 i; 
	u16 *p;
	while(g_buff_Invalid==0)//<2F>ȴ<EFBFBD><C8B4><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
	{
		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];
		}
	}
	//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>֮<EFBFBD><D6AE><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD><CEAA>Ч
	g_buff_Invalid=0;
}