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GraphicsConsole video resolution 1920 x 1200
Graphics - Mode 0, Column = 80, Row = 25
Graphics - Mode 1, Column = 80, Row = 50
Graphics - Mode 2, Column = 100, Row = 31
Graphics - Mode 3, Column = 240, Row = 63
……………..
GraphicsConsole video resolution 800 x 600
Graphics - Mode 0, Column = 80, Row = 25
Graphics - Mode 1, Column = 0, Row = 0
Graphics - Mode 2, Column = 100, Row = 31

typedef struct
{
        UINTN                            Signature;
        EFI_GRAPHICS_OUTPUT_PROTOCOL     *GraphicsOutput;
        EFI_UGA_DRAW_PROTOCOL            *UgaDraw;
        EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL  SimpleTextOutput;
        EFI_SIMPLE_TEXT_OUTPUT_MODE      SimpleTextOutputMode;
        GRAPHICS_CONSOLE_MODE_DATA       *ModeData;
        EFI_GRAPHICS_OUTPUT_BLT_PIXEL    *LineBuffer;
} GRAPHICS_CONSOLE_DEV;

#define GRAPHICS_CONSOLE_CON_OUT_DEV_FROM_THIS(a) \
  CR (a, GRAPHICS_CONSOLE_DEV, SimpleTextOutput, GRAPHICS_CONSOLE_DEV_SIGNATURE)

Private = GRAPHICS_CONSOLE_CON_OUT_DEV_FROM_THIS (SimpleTextOutput);
                
if (Private->Signature != GRAPHICS_CONSOLE_DEV_SIGNATURE) {
                        continue;
                }

Print(L"Show ModeData:\n");
Print(L" Col      : %d\n",Private->ModeData->Columns);
Print(L" Row      : %d\n",Private->ModeData->Rows);
Print(L" DeltaX   : %d\n",Private->ModeData->DeltaX);
Print(L" DeltaY   : %d\n",Private->ModeData->DeltaY);
Print(L" GopWidth : %d\n",Private->ModeData->GopWidth);
Print(L" GopHeight: %d\n",Private->ModeData->GopHeight);
Print(L" GopMode  : %d\n",Private->ModeData->GopModeNumber);

Show ModeData:
 Col      : 80
 Row      : 25
 DeltaX   : 80
 DeltaY   : 62
 GopWidth : 800
 GopHeight: 600
 GopMode  : 2

Show ModeData:
 Col      : 80
 Row      : 25
 DeltaX   : 640
 DeltaY   : 362
 GopWidth : 1920
 GopHeight: 1200
 GopMode  : 0

        //
        // if not supporting current mode, try 800x600 which is required by UEFI/EFI spec
        //
        HorizontalResolution = 800;
        VerticalResolution   = 600;
        Status = CheckModeSupported (
                     Private->GraphicsOutput,
                     HorizontalResolution,
                     VerticalResolution,
                     &ModeNumber
                     );

  NewModeBuffer[ValidCount].DeltaX        = (HorizontalResolution - (NewModeBuffer[ValidCount].Columns * EFI_GLYPH_WIDTH)) >> 1;
  NewModeBuffer[ValidCount].DeltaY        = (VerticalResolution - (NewModeBuffer[ValidCount].Rows * EFI_GLYPH_HEIGHT)) >> 1;   

#include  <Uefi.h>
#include  <Library/UefiLib.h>
#include  <Library/ShellCEntryLib.h>
#include  <Protocol/SimpleFileSystem.h>
#include  <Library/UefiBootServicesTableLib.h> //global gST gBS gImageHandle
#include  <Library/ShellLib.h>
#include  <Library/MemoryAllocationLib.h>
#include  <Library/BaseMemoryLib.h>
#include  <Protocol/UgaDraw.h>
#include  <Library/DebugLib.h>
#include  <stdio.h>
#include  <stdlib.h>

//
// Device Structure
//
#define GRAPHICS_CONSOLE_DEV_SIGNATURE  SIGNATURE_32 ('g', 's', 't', 'o')

typedef struct
{
        UINTN   Columns;
        UINTN   Rows;
        INTN    DeltaX;
        INTN    DeltaY;
        UINT32  GopWidth;
        UINT32  GopHeight;
        UINT32  GopModeNumber;
} GRAPHICS_CONSOLE_MODE_DATA;

typedef struct
{
        UINTN                            Signature;
        EFI_GRAPHICS_OUTPUT_PROTOCOL     *GraphicsOutput;
        EFI_UGA_DRAW_PROTOCOL            *UgaDraw;
        EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL  SimpleTextOutput;
        EFI_SIMPLE_TEXT_OUTPUT_MODE      SimpleTextOutputMode;
        GRAPHICS_CONSOLE_MODE_DATA       *ModeData;
        EFI_GRAPHICS_OUTPUT_BLT_PIXEL    *LineBuffer;
} GRAPHICS_CONSOLE_DEV;

#define GRAPHICS_CONSOLE_CON_OUT_DEV_FROM_THIS(a) \
  CR (a, GRAPHICS_CONSOLE_DEV, SimpleTextOutput, GRAPHICS_CONSOLE_DEV_SIGNATURE)

// Include/Protocol/SimpleTextOut.h
EFI_GUID        gEfiSimpleTextOutProtocolGuid  = { 0x387477C2, 0x69C7, 0x11D2,
        { 0x8E, 0x39, 0x00, 0xA0, 0xC9, 0x69, 0x72, 0x3B }
};

/**
  Check if the current specific mode supported the user defined resolution
  for the Graphics Console device based on Graphics Output Protocol.

  If yes, set the graphic devcice's current mode to this specific mode.

  @param  GraphicsOutput        Graphics Output Protocol instance pointer.
  @param  HorizontalResolution  User defined horizontal resolution
  @param  VerticalResolution    User defined vertical resolution.
  @param  CurrentModeNumber     Current specific mode to be check.

  @retval EFI_SUCCESS       The mode is supported.
  @retval EFI_UNSUPPORTED   The specific mode is out of range of graphics
                            device supported.
  @retval other             The specific mode does not support user defined
                            resolution or failed to set the current mode to the
                            specific mode on graphics device.

**/
EFI_STATUS
CheckModeSupported (
  EFI_GRAPHICS_OUTPUT_PROTOCOL  *GraphicsOutput,
  IN  UINT32                    HorizontalResolution,
  IN  UINT32                    VerticalResolution,
  OUT UINT32                    *CurrentModeNumber
  )
{
  UINT32     ModeNumber;
  EFI_STATUS Status;
  UINTN      SizeOfInfo;
  EFI_GRAPHICS_OUTPUT_MODE_INFORMATION *Info;
  UINT32     MaxMode;

  Status  = EFI_SUCCESS;
  MaxMode = GraphicsOutput->Mode->MaxMode;

  for (ModeNumber = 0; ModeNumber < MaxMode; ModeNumber++) {
    Status = GraphicsOutput->QueryMode (
                       GraphicsOutput,
                       ModeNumber,
                       &SizeOfInfo,
                       &Info
                       );
    if (!EFI_ERROR (Status)) {
      if ((Info->HorizontalResolution == HorizontalResolution) &&
          (Info->VerticalResolution == VerticalResolution)) {
        if ((GraphicsOutput->Mode->Info->HorizontalResolution == HorizontalResolution) &&
            (GraphicsOutput->Mode->Info->VerticalResolution == VerticalResolution)) {
          //
          // If video device has been set to this mode, we do not need to SetMode again
          //
          FreePool (Info);
          break;
        } else {
          Status = GraphicsOutput->SetMode (GraphicsOutput, ModeNumber);
          if (!EFI_ERROR (Status)) {
            FreePool (Info);
            break;
          }
        }
      }
      FreePool (Info);
    }
  }

  if (ModeNumber == GraphicsOutput->Mode->MaxMode) {
    Status = EFI_UNSUPPORTED;
  }

  *CurrentModeNumber = ModeNumber;
  return Status;
}

INTN
EFIAPI
main (
        IN UINTN Argc,
        IN CHAR16 **Argv
)
{
        UINTN                            NumHandles;
        EFI_STATUS                       Status;
        EFI_HANDLE                      *HandleBuffer;
        GRAPHICS_CONSOLE_DEV             *Private;
        UINTN                            Index;
        EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL  *SimpleTextOutput;
        UINT32                          HorizontalResolution;
        UINT32                          VerticalResolution;
        UINT32                               ModeNumber;
        EFI_GRAPHICS_OUTPUT_PROTOCOL_MODE    *Mode;        
        //
        // Locate all handles that are using the SFS protocol.
        //
        Status = gBS->LocateHandleBuffer(
                        ByProtocol,
                        &gEfiSimpleTextOutProtocolGuid,
                        NULL,
                        &NumHandles,
                        &HandleBuffer);
        if (EFI_ERROR(Status) != FALSE)
        {
                Print(L"failed to locate any handles using the EfiSimpleTextOutProtocol\n");
                goto CleanUp;
        }

        for (Index = 0; (Index < NumHandles); Index += 1)
        {
                Status = gBS->HandleProtocol(
                                HandleBuffer[Index],
                                &gEfiSimpleTextOutProtocolGuid,
                                (VOID**)&SimpleTextOutput);

                if (EFI_ERROR(Status))
                {
                        Print(L"Failed to locate SimpleTextOutProtocol.\n");
                        continue;
                }
                
                Private = GRAPHICS_CONSOLE_CON_OUT_DEV_FROM_THIS (SimpleTextOutput);
                
                if (Private->Signature != GRAPHICS_CONSOLE_DEV_SIGNATURE) {
                        continue;
                }
                
                Print(L"Show ModeData:\n");
                Print(L" Col      : %d\n",Private->ModeData->Columns);
                Print(L" Row      : %d\n",Private->ModeData->Rows);
                Print(L" DeltaX   : %d\n",Private->ModeData->DeltaX);
                Print(L" DeltaY   : %d\n",Private->ModeData->DeltaY);
                Print(L" GopWidth : %d\n",Private->ModeData->GopWidth);
                Print(L" GopHeight: %d\n",Private->ModeData->GopHeight);
                Print(L" GopMode  : %d\n",Private->ModeData->GopModeNumber);

                // Set new screen offset
                Private->ModeData->DeltaX=80;
                Private->ModeData->DeltaY=62;
                //
                // if not supporting current mode, try 800x600 which is required by UEFI/EFI spec
                //
                HorizontalResolution = 800;
                VerticalResolution   = 600;
                Status = CheckModeSupported (
                             Private->GraphicsOutput,
                             HorizontalResolution,
                             VerticalResolution,
                             &ModeNumber
                             );
                
                Mode = Private->GraphicsOutput->Mode;
                
                if (EFI_ERROR (Status) && Mode->MaxMode != 0) {
                  //
                  // Set default mode failed or device don't support default mode, then get the current mode information
                  //
                  HorizontalResolution = Mode->Info->HorizontalResolution;
                  VerticalResolution = Mode->Info->VerticalResolution;
                  ModeNumber = Mode->Mode;
                  Print(L" CheckModeSupported failed\n");
                } else {
                  Print(L" CheckModeSupported passed\n");
                }
                Private->SimpleTextOutput.Reset(&Private->SimpleTextOutput,TRUE);
        }

CleanUp:
        if (HandleBuffer != NULL)
        {
                FreePool(HandleBuffer);
        }

        return(0);
}

        "C:\Program Files (x86)\Microsoft Visual Studio 14.0\Vc\bin\x86_amd64\cl.exe" /showIncludes /nologo /E /TC /DVFRCOMPILE /FIFileExplorerLibStrDefs.h /Ic:\buildbs\stable202108\MdeModulePkg\Library\FileExplorerLib  /Ic:\buildbs\stable202108\Build\EmulatorX64\DEBUG_VS2015x86\X64\MdeModulePkg\Library\FileExplorerLib\FileExplorerLib\DEBUG  /Ic:\buildbs\stable202108\MdePkg  /Ic:\buildbs\stable202108\MdePkg\Include  /Ic:\buildbs\stable202108\MdePkg\Test\UnitTest\Include  /Ic:\buildbs\stable202108\MdePkg\Include\X64  /Ic:\buildbs\stable202108\MdeModulePkg  /Ic:\buildbs\stable202108\MdeModulePkg\Include  /Ic:\buildbs\stable202108\MdeModulePkg\Library\BrotliCustomDecompressLib\brotli\c\include c:\buildbs\stable202108\MdeModulePkg\Library\FileExplorerLib\FileExplorerVfr.vfr > c:\buildbs\stable202108\Build\EmulatorX64\DEBUG_VS2015x86\X64\MdeModulePkg\Library\FileExplorerLib\FileExplorerLib\OUTPUT\FileExplorerVfr.i
BootManagerVfr.Vfr
DeviceManagerVfr.Vfr
'VfrCompile' is not recognized as an internal or external command,
operable program or batch file.

Microsoft (R) Program Maintenance Utility Version 14.00.24210.0
Copyright (C) Microsoft Corporation.  All rights reserved.

        cl.exe -c  /nologo /Zi /c /O2 /MT /W4 /WX /D _CRT_SECURE_NO_DEPRECATE /D _CRT_NONSTDC_NO_DEPRECATE /W2 -I .\brotli\c\include  -I . -I C:\BuildBs\stable202108\BaseTools\Source\C\Include -I C:\BuildBs\stable202108\BaseTools\Source\C\Include\Ia32 -I C:\BuildBs\stable202108\BaseTools\Source\C\Common BrotliCompress.c -FoBrotliCompress.obj
cl : Command line warning D9025 : overriding '/W4' with '/W2'
BrotliCompress.c
BrotliCompress.c(20): fatal error C1083: Cannot open include file: './brotli/c/common/constants.h': No such file or directory
NMAKE : fatal error U1077: '"C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\BIN\cl.exe"' : return code '0x2'
Stop.

NMAKE : fatal error U1077: 'if' : return code '0x1'
Stop.
NMAKE : fatal error U1077: 'if' : return code '0x1'
Stop.

Processing meta-data .
Architecture(s)  = X64
Build target     = DEBUG
Toolchain        = VS2015x86

Active Platform          = c:\buildbs\stable202108\OvmfPkg\OvmfPkgX64.dsc
...

build.py...
c:\buildbs\stable202108\CryptoPkg\Library\OpensslLib\OpensslLibCrypto.inf(26): error 000E: File/directory not found in workspace
        c:\buildbs\stable202108\CryptoPkg\Library\OpensslLib\openssl\e_os.h

#include <Wire.h>
#include "RTClib.h"
RTC_DS1307 RTC;

void setup () {
    Serial.begin(9600);
    Wire.begin();
    RTC.begin();
  if (! RTC.isrunning()) {
    Serial.println("RTC is NOT running!");
    // following line sets the RTC to the date & time this sketch was compiled
    RTC.adjust(DateTime(__DATE__, __TIME__));
  }
}
void loop () {
    DateTime now = RTC.now(); 
    Serial.print(now.year(), DEC);
    Serial.print('/');
    Serial.print(now.month(), DEC);
    Serial.print('/');
    Serial.print(now.day(), DEC);
    Serial.print(' ');
    Serial.print(now.hour(), DEC);
    Serial.print(':');
    Serial.print(now.minute(), DEC);
    Serial.print(':');
    Serial.print(now.second(), DEC);
    Serial.println(); 
    delay(1000);
}