void fnPrintScreen(void)
{
    unsigned int i, j, n = 0;
    FRESULT ret;
    FIL fbmpout;
    unsigned char *psrc = (unsigned char *)((int)&gRGBBuf[iRGBRdyBufNo][0+640*3*479]);
    unsigned char *pdst = (unsigned char *)(0x01C00000);
    for ( j = 0; j < 480; j++)
    {        
        for ( i = 0; i < 640; i++ )
        {
            pdst[2] = *psrc++;
            pdst[1] = *psrc++;
            pdst[0] = *psrc++;
            pdst += 3;
        }
        psrc -= 3840;
    }

    char sFileName[20];
    char str[10];
    strcpy(sFileName, tUvStatus.sAviName);
    sprintf(str, "%d.bmp", tUvStatus.iAviCnt);
    strcat(sFileName, str);
    LOG_INFO("enc:filename=%s.\r\n", sFileName);
    
    ret = f_open(&fbmpout, sFileName, FA_CREATE_ALWAYS | FA_WRITE);

    if(FR_OK != ret)
    {   
        LOG_DEBUG("Error: Output file err... exiting\n");
        return (-1);
    }

    ret = f_write (&fbmpout, (const void *)sBmpVgaRgb24Hdr, sizeof(sBmpVgaRgb24Hdr), &n);

    ret = f_write(&fbmpout, (const void *)(0x01C00000), RES_VGA_SIZE_RGB24, &n);

    if(FR_OK != ret)
    {
        LOG_DEBUG("Error: Fwrite Output err... exiting\n");
        return (-1);
    }
    tUvStatus.iAviCnt++;
    Sys_SaveIniFile();
    LOG_INFO("enc:save ini ok.\r\n");
    f_close(&fbmpout);

}