WhyCan Forum(哇酷开发者社区)

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ratio=f -2143974832 0
Build at: Apr 22 2021 18:08:48
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MACRO
	fetch $count			   ;//提取操作码	;$标号 宏名 $参数1，$参数2，...
;//---------------------------------------------------------------------
	ldr r0,clocksh			   ;//处理apu需要的时钟数
	add r0,r0,#$count
	str r0,clocksh

	ldr r1,opz            ;//获取代码跳转表地址
;//-------------------------------------------------------------------------
	subs cycles,cycles,#$count*256;//CYCLE=256 ;//	3*256 正数或0就执行下2条指令  
	ldrplb r0,[m6502_pc],#1			   ; //从存储器中加载字节到一个寄存器中	 r0=操作码
;	ldrpl pc,[m6502_optbl,r0,lsl#2]	  ;//r10 ********r0=r0x4***运行代码的地址**************************************
	ldrpl pc,[r1,r0,lsl#2]
	ldr pc,nexttimeout
	MEND

.macro fetch count	
			   //提取操作码	//$标号 宏名 $参数1，$参数2，...
//---------------------------------------------------------------------
	ldr r0,clocksh			   //处理apu需要的时钟数
	add r0,r0,#\count
	str r0,clocksh

	ldr r1,opz            //获取代码跳转表地址
//-------------------------------------------------------------------------
	subs cycles,cycles,#\count*256   //CYCLE=256 ////	3*256 正数或0就执行下2条指令  
	ldrplb r0,[m6502_pc],#1			   //从存储器中加载字节到一个寄存器中	 r0=操作码
//	ldrpl pc,[m6502_optbl,r0,lsl#2]	  //r10 ********r0=r0x4***运行代码的地址**************************************
	ldrpl pc,[r1,r0,lsl#2]
	ldr pc,nexttimeout
.endm

C EQU 0x01	;//6502 flags  6502标志
Z EQU 0x02
I EQU 0x04
D EQU 0x08
B EQU 0x10	;//(allways 1 except when IRQ pushes it)IRQ外部中断
R EQU 0x20	;//(locked at 1)
V EQU 0x40
N EQU 0x80

.equ C , 0x01 //6502 flags  6502标志
.equ Z , 0x02
.equ I , 0x04
.equ D , 0x08
.equ B , 0x10 //(allways 1 except when IRQ pushes it)IRQ外部中断
.equ R , 0x20
.equ V , 0x40 //(locked at 1)
.equ N , 0x80

_type	SETA      _ABS

.equ _type , _ABS

cpu6502_init PROC
;----------------------------------------------------------------------------
stmfd sp!,{r4-r11,lr}
ldr r10,=cpu_data	;读取地址
ldr r11,=NES_RAM	;r11=cpu_zpage

.text
.global cpu6502_init
.type cpu6502_init, %function
.align 8
cpu6502_init:
//----------------------------------------------------------------------------
stmfd sp!,{r4-r11,lr}		
ldr r10,=cpu_data	//读取地址
ldr r11,=NES_RAM	//r11=cpu_zpage	
ldr r11,[r11]       //NES_RAM用了指针 

globalptr	RN r10

globalptr .req r10

ldmfd sp!,{r3,lr}
//orr lr,#0x01		//lr最低位置1防止进入arm状态 //F1C100s 本来就是arm状态，需要注释掉这个指令 --By VeiLiang 

u8 PADdata0 __attribute__ ((aligned (8)));  			//手柄1键值 [7:0]右7 左6 下5 上4 Start3 Select2 B1 A0  
u8 PADdata1 __attribute__ ((aligned (8)));   			//手柄2键值 [7:0]右7 左6 下5 上4 Start3 Select2 B1 A0  
u8 *NES_RAM __attribute__ ((aligned (8)));			//保持1024字节对齐
u8 *NES_SRAM __attribute__ ((aligned (8)));  
u8* spr_ram __attribute__ ((aligned (8)));			//精灵RAM,256字节

//读取游戏手柄数据
void nes_get_gamepadval(void)
{  
	// u8 *pt;
	// while((usbx.bDeviceState&0XC0)==0X40)//USB设备插入了,但是还没连接成功,猛查询.
	// {
	// 	usbapp_pulling();	//轮询处理USB事务
	// }
	// usbapp_pulling();		//轮询处理USB事务
	// if(usbx.hdevclass==4)	//USB游戏手柄
	// {	
	// 	PADdata0=fcpad.ctrlval;
	// 	PADdata1=0;
	// }else if(usbx.hdevclass==3)//USB键盘模拟手柄
	// {
	// 	KEYBRD_FCPAD_Decode(pt,0);
	// 	PADdata0=fcpad.ctrlval;
	// 	PADdata1=fcpad1.ctrlval; 
	// }	
}