misc.c

LCD OSD 程序用於8051 開發lcd

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

#define DelayPeriod	((WORD)CPU_CLOCK_MHZ*78/12)

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