之前已经实现了NES模拟器玩游戏。W801学习笔记九：HLK-W801制作学习机/NES游戏机(模拟器)

现在要在新版本掌机中移植过来。

1、把NES文件都拷贝到SD卡中。

这回不会受内存大小限制了。我这里拷贝了4个，还可以拷贝更多。

 2、应用初始化中，加载NES文件。

把NES文件名在菜单中进行绑定，动态加载到PSRAM中

int NesSim::scean_init(cJSON*  param){
	char * fileName= cJSON_GetObjectItem(param,"f")->valuestring;
	int sk = cJSON_GetObjectItem(param,"k")->valueint;
	size_t readsize = fatfs_readFile(fileName, &romData);
	LCD_Clear(BLACK);

	if(0!=InfoNES_Load((BYTE*)romData,sk))
	{
		printf("InfoNES_Load fail \n");
	}
	else
	{ 
		printf("InfoNES_Load success \n");
		InfoNES_Main();
	} 
	return 0;
}

k参数用于设置跳过的帧数，以提高最终游戏帧率。

3、修改并确认按键。

InfoNES_system.c

void InfoNES_PadState( DWORD *pdwPad1, DWORD *pdwPad2, DWORD *pdwSystem )
{
   u32 keys = KEY_INPUTB;
    *pdwPad1 = 0;

	if(!(keys & (0x1 << KEY_GPIO_UP)))
	{
		*pdwPad1 |= PAD_JOY_UP;
	}

	if(!(keys & (0x1 << KEY_GPIO_DOWN)))
	{
		*pdwPad1 |= PAD_JOY_DOWN;
	}
	if(!(keys & (0x1 << KEY_GPIO_LEFT)))
	{
		*pdwPad1 |= PAD_JOY_LEFT;
	}
	if(!(keys & (0x1 << KEY_GPIO_RHT)))
	{
		*pdwPad1 |= PAD_JOY_RIGHT;
	}
	if(!(keys & (0x1 <<KEY_GPIO_SEL)))
	{
		*pdwPad1 |= PAD_JOY_START;
	}
	if(!(keys & (0x1 << KEY_GPIO_A)))
	{
		*pdwPad1 |= PAD_JOY_A;
	}
	if(!(keys & (0x1 << KEY_GPIO_B)))
	{
		*pdwPad1 |= PAD_JOY_B;
	}
	if(!(keys & (0x1 << KEY_GPIO_EXIT)))
	{
		*pdwPad1 |= PAD_JOY_SELECT;
	}
	
}

KeyAdepter.h

#define KEY_GPIO_LEFT 	27
#define KEY_GPIO_DOWN 	18
#define KEY_GPIO_RHT 	17
#define KEY_GPIO_UP	 	16
#define KEY_GPIO_A 		21
#define KEY_GPIO_B 		23
#define KEY_GPIO_C 		22
#define KEY_GPIO_D 		24

#define KEY_GPIO_SEL 	26
#define KEY_GPIO_EXIT 	25

#define KEY_INPUTB (*(TLS_REG*)(HR_GPIO_DATA + TLS_IO_AB_OFFSET))

4、在菜单中加入模拟器游戏

。。。
            {
			    "t": "NES 模拟器",
				"i": "-",
				"d": 0,
				"g": {},
				"s": [
					{
						"t": "魂斗罗",
						"i": "-",
						"d": 400,
						"g": {"f":"nes/hdl.nes", "k":1},
						"s": []
					},
					{
						"t": "沙罗曼蛇II",
						"i": "-",
						"d": 400,
						"g": {"f":"nes/slms.nes", "k":1},
						"s": []
					},
					{
						"t": "马戏团",
						"i": "-",
						"d": 400,
						"g": {"f":"nes/mxt.nes", "k":1},
						"s": []
					},
					{
						"t": "超级马里奥",
						"i": "-",
						"d": 400,
						"g": {"f":"nes/cjmla.nes", "k":2},
						"s": []
					}
				]
			}
。。。

5、修改游戏加载

InfoNES.c

int InfoNES_Load( BYTE * rom, int sk)
{
/*
 *  Load a cassette
 *
 *  Parameters
 *    const char *pszFileName            (Read)
 *      File name of ROM image
 *
 *  Return values
 *     0 : It was finished normally.
 *    -1 : An error occurred.
 *
 *  Remarks
 *    Read a ROM image in the memory. 
 *    Reset InfoNES.
 */

  // Release a memory for ROM
  InfoNES_ReleaseRom();

  // Read a ROM image in the memory
  GameFrameSkip = sk;
	  
	  
  if ( InfoNES_ReadRom( rom ) < 0 )
    return -1;

  // Reset InfoNES
  if ( InfoNES_Reset() < 0 )
    return -1;

  // Successful
  return 0;
}