doublebuffering.c

isp1161驱动代码是我下载并该动后而成,还有点缺点,但对你可能有点帮助

// main and cache
#define __CACHE_INVALIDATE_SET(VALUE) asm( "CACHE_INVALIDATE_SET: "); asm( "push %R0");	       asm( "ldi  %0   , %%R0" : : "i" (VALUE) ); asm( "mvtc  0   , %CR5"); asm( "pop  %R0");
#define __CACHE_INVALIDATE_CHECK() 	  asm( "CACHE_INVALIDATE_CHECK:");asm( "mvfc  0  , %CR6"); asm( "and  %R0, 0x00100000, %R0");	      asm( "jnz   CACHE_INVALIDATE_CHECK"); 
#define __CACHE_MODE_SET(VALUE)	      asm( "CACHE_MODE_SET: ");       asm( "push %R0");        asm( "ldi  %0   , %%R0" : : "i" (VALUE) ); asm( "mvtc  0   , %CR3"); asm( "pop  %R0");
#define __CACHE_ACTIVE_SET(VALUE)     asm( "CACHE_ACTIVE_SET: ");     asm( "push %R0");        asm( "ldi  %0   , %%R0" : : "i" (VALUE) ); asm( "mvtc  0   , %CR7"); asm( "pop  %R0");
// CACHE MASTER COMMAND REGISTER
#     define __CACHE_UNIT_DISABLE          ( 0 << 11 )
#     define __CACHE_UNIT_ENABLE           ( 1 << 11 )
#     define __CACHE_UNIT_NORMAL           ( 0 << 0 )
#     define __CACHE_UNIT_DELAY            ( 1 << 0 )
// CACHE INVALIDATE REGISTER
#     define __CACHE_INVALIDATE_DISABLE   ( 0 << 0 )
#     define __CACHE_INVALIDATE_ENABLE    ( 1 << 0 )
// CACHE INVALIDATE REGISTER
#     define __CACHE_WRITE_THROUGH        ( 0 << 6 )
#     define __CACHE_WRITE_BACK           ( 1 << 6 )

int main( void )
{
asm("CACHE_CONFIGURATION_SET:");
__CACHE_INVALIDATE_SET(__CACHE_INVALIDATE_ENABLE)
__CACHE_INVALIDATE_CHECK()
__CACHE_MODE_SET(__CACHE_WRITE_BACK)
__CACHE_ACTIVE_SET(__CACHE_UNIT_ENABLE  | __CACHE_UNIT_DELAY   )     // process read_hit & miss at two cpuclk
	VR0_memory_controller_reset();// FMEM/TMEM - memory controller reset
	CRT_320x240_noninterlace();   // set screen mode 640*480
	InitRenderingEngine_zy();     // Rendering engine reset
	// select Render target => back-buffer. for double buffering...	
	 *(unsigned short*)(0x300008c) = 0x0006; // dither mode : disable,render target : back-buffer

     user();
	
}