misc.c

来自「完整的软件学习--显示器驱动视频软件」· C语言 代码 · 共 69 行

#include <intrins.h>
#include "types.h"
#include "board.h"
#include "global.h"

#if MSTMCU
     #define DelayPeriod	(CPU_CLOCK_MHZ*73/20)
#else
      #if DoubleSpeed
		#define DelayPeriod	(CPU_CLOCK_MHZ*73/20)
	  #else
		#define DelayPeriod	(CPU_CLOCK_MHZ*73/40)
	  #endif
#endif

void Delay4us(void)
{
#if CPU_CLOCK_MHZ>=20
  _nop_();
  _nop_();
  _nop_();
  _nop_();
  _nop_();
  _nop_();
#endif
}

void ForceDelay1ms(WORD msNums)
{ WORD t;

  if (msNums>0)
    { while (msNums--)
        { t=DelayPeriod;
          while (t--);
        }
    }
}

void Delay1ms(WORD msNums)
{ WORD t;

  if (msNums>0)
    { while (msNums--)
        { t=DelayPeriod;
          while (t--)
            if (InputTimingChangeFlag)// || RxBusyFlag)
              return;
        }
    }
}


BYTE GetVSyncTime(void)
{ WORD freq;

  freq=((DWORD)MST_CLOCK_MHZ*10+SrcHPeriod/2)/SrcHPeriod; //get hfreq round 5
  freq=((WORD)SrcVTotal*10+(freq/2))/freq;
  return (BYTE)freq;
}

//yurian add @ 20050125
void SetAudio(bit on)
{
  if(on)   hw_SetVolume();
  else   	hw_ClrVolume();
  
}