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标题: DPWM方式控制背光 [打印本页]

作者: MingLiu 时间: 2016-10-31 21:01
标题: DPWM方式控制背光
平台:MST70x
原来的背光调节方式客户反馈在室外亮度值调到50以上就发白。亮度值共有100。要求用DPWM来控制背光。这样亮度调高不会发白。

void msAdjustBrightness(BYTE brightness)
{
      BYTE ucBank = msReadByte( BK0_00_REGBK);

{
msWriteByte(BK0_00_REGBK, REG_BANK4_LVDS_CCFL);
msWriteByte(BK4_6B, 0x80);

#if  1//CCFL_BURST_MODE
msWriteByte(BK4_91, 0x00);
msWriteByte(BK4_90, brightness);//tony for SZ demo 0xAE);  //MW_Liu20150908
#else
msWriteByte(BK4_82, 0xAA);
#endif

msWriteByte(BK4_6B, 0x00);
//msWriteByte(BK0_00_REGBK, REG_BANK_SCALER);

   msWriteByte(BK0_00_REGBK, REG_BANK_SCALER);
   msWriteBit(BK0_58_BRIGHTNESS_EN, 1,BRI_EN_B);

         msWriteByte(BK0_59_BRI_R, 0x73);
         msWriteByte(BK0_5B_BRI_B, 0x73);
         msWriteByte(BK0_5A_BRI_G, 0x73);

}
   msWriteByte(BK0_00_REGBK, ucBank);
}

BOOL AdjustBrightness(MenuItemActionType action)
{
WORD tempValue;

if(IsVideoPortInUse()||IsCCIR656InUse())
{
      tempValue=DecIncValue(action, g_VideoSetting.VideoBrightness, MinDefVideoBrightness, MaxDefVideoBrightness, 1);
      if (tempValue==g_VideoSetting.VideoBrightness)
         return FALSE;
      g_VideoSetting.VideoBrightness=tempValue;
      //  printf("\r\tempValue=%d\n",tempValue);
      tempValue=usrNonLinearCalculate(g_NLCBrightness,tempValue);
   /// printf("\r\calculate =%d\n",tempValue);

      msAdjustBrightness(tempValue);
}
#if YPBPR_ENABLE
else if(IsYPbPrInUse())
{
      tempValue=DecIncValue(action, g_YPbPrSetting.Brightness, MinDefYPbPrBrightness, MaxDefYPbPrBrightness, 1);
      if (tempValue==g_YPbPrSetting.Brightness)
         return FALSE;
      g_YPbPrSetting.Brightness=tempValue;

      tempValue=usrNonLinearCalculate(g_NLCBrightness,tempValue);
      msAdjustBrightness(tempValue);
}
#endif
else
{
      tempValue=DecIncValue(action, g_PcSetting.Brightness, MinDefBrightness, MaxDefBrightness, 1);
      if (tempValue==g_PcSetting.Brightness)
         return FALSE;
      g_PcSetting.Brightness=tempValue;

      tempValue=usrNonLinearCalculate(g_NLCBrightness,tempValue);
      msAdjustBrightness(tempValue);
}
return TRUE;
}

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