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EfiClock.inf

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+[Defines]
+  INF_VERSION = 1.25
+  BASE_NAME = EfiClock
+  FILE_GUID = 8e2228f9-6249-48a0-bfd6-f99479ad8a46 # Get a GUID from guidgen.com
+  MODULE_TYPE = UEFI_APPLICATION
+  VERSION_STRING = 1.0
+  ENTRY_POINT = UefiEntry
+ 
+[Sources]
+  UefiMain.c
+ 
+[Packages]
+  MdePkg/MdePkg.dec
+ 
+[LibraryClasses]
+  UefiApplicationEntryPoint
+  UefiLib
+  TimerLib
+ 
+[Guids]
+ 
+[Ppis]
+ 
+[Protocols]
+
+[FeaturePcd]
+ 
+[Pcd]

UefiMain.c

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+#include <Uefi.h>
+#include <Protocol/GraphicsOutput.h>
+#include <Library/UefiLib.h>
+#include <Library/TimerLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiRuntimeServicesTableLib.h>
+
+EFI_GUID gop_guid = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID; 
+EFI_GRAPHICS_OUTPUT_PROTOCOL *Gop = NULL;
+UINT64 Gop_FrameBufferBase = 0;
+UINT32 Gop_PixelsPerScanLine = 0;
+
+static inline void drawPixel(UINT32 x, UINT32 y, UINT32 pixel)
+{
+  *((UINT32*)(Gop_FrameBufferBase + 4 * Gop_PixelsPerScanLine * y + 4 * x)) = pixel;
+}
+
+static inline void drawRectangle(UINT32 x, UINT32 y, UINT32 w, UINT32 h, UINT32 pixel)
+{
+  for(int ix = 0; ix < w; ++ix)
+  {
+    for(int iy = 0; iy < w; ++iy)
+    {
+      drawPixel(x+ix, y+iy, pixel);
+    }
+  }
+}
+
+EFI_STATUS EFIAPI UefiEntry(IN EFI_HANDLE imgHandle, IN EFI_SYSTEM_TABLE* sysTable)
+{
+  gST = sysTable;
+  gBS = sysTable->BootServices;
+  gImageHandle = imgHandle;
+
+  gBS->SetWatchdogTimer(0, 0, 0, NULL);
+
+  EFI_STATUS status = 0;
+
+  /**
+   * GOP Setup
+   */
+
+  status = gBS->LocateProtocol(&gop_guid, NULL, (VOID **)&Gop);
+  if (EFI_ERROR(status)) {
+    Print(u"\r\nERROR: %x; Cannot locate GOP protocol. Return.\r\n", status);
+    return status;
+  }
+
+  Gop_FrameBufferBase   = Gop->Mode->FrameBufferBase;
+  Gop_PixelsPerScanLine = Gop->Mode->Info->PixelsPerScanLine;
+  UINT32 W = Gop->Mode->Info->HorizontalResolution;
+  UINT32 H = Gop->Mode->Info->VerticalResolution;
+  
+  /**
+   * Fills framebuffer
+   */
+   
+  drawRectangle(0,0,W,H,0x000000);
+
+  UINT32 sq_sid  = W * 50 / 1000;
+  UINT32 sq_gap  = W * 17 / 1000;
+
+  /**
+   * Computes squares coordinates
+   */
+
+  UINT32 col0 = W/2 - 7*sq_gap/2 - 4*sq_sid;
+  UINT32 col1 = W/2 - 5*sq_gap/2 - 3*sq_sid;
+  UINT32 col2 = W/2 -   sq_gap/2 -   sq_sid;
+  UINT32 col3 = W/2 +   sq_gap/2           ;
+  UINT32 col4 = W/2 + 5*sq_gap/2 + 2*sq_sid;
+  UINT32 col5 = W/2 + 7*sq_gap/2 + 3*sq_sid;
+
+  UINT32 row0 = H/2 - 3*sq_sid/2 -   sq_gap;
+  UINT32 row1 = H/2 -   sq_sid/2           ;
+  UINT32 row2 = H/2 +   sq_sid/2 +   sq_gap;
+
+  /**
+   * Loops drawing the clockface
+   */
+   
+  EFI_TIME Time;
+  UINT16 second, minute, hour;
+  const UINT32 accentColor = 0xFFAB3F, idleColor = 0x555555;
+  
+  while(1)
+  {
+    gRT->GetTime(&Time, NULL);      
+    second = Time.Second;
+    minute = Time.Minute;
+    hour   = Time.Hour;
+    
+    second & 0b000001 ? drawRectangle(col5,row2,sq_sid,sq_sid,accentColor) : drawRectangle(col5,row2,sq_sid,sq_sid,idleColor);
+    second & 0b000010 ? drawRectangle(col5,row1,sq_sid,sq_sid,accentColor) : drawRectangle(col5,row1,sq_sid,sq_sid,idleColor);
+    second & 0b000100 ? drawRectangle(col5,row0,sq_sid,sq_sid,accentColor) : drawRectangle(col5,row0,sq_sid,sq_sid,idleColor);
+    second & 0b001000 ? drawRectangle(col4,row2,sq_sid,sq_sid,accentColor) : drawRectangle(col4,row2,sq_sid,sq_sid,idleColor);
+    second & 0b010000 ? drawRectangle(col4,row1,sq_sid,sq_sid,accentColor) : drawRectangle(col4,row1,sq_sid,sq_sid,idleColor);
+    second & 0b100000 ? drawRectangle(col4,row0,sq_sid,sq_sid,accentColor) : drawRectangle(col4,row0,sq_sid,sq_sid,idleColor);
+
+    minute & 0b000001 ? drawRectangle(col3,row2,sq_sid,sq_sid,accentColor) : drawRectangle(col3,row2,sq_sid,sq_sid,idleColor);
+    minute & 0b000010 ? drawRectangle(col3,row1,sq_sid,sq_sid,accentColor) : drawRectangle(col3,row1,sq_sid,sq_sid,idleColor);
+    minute & 0b000100 ? drawRectangle(col3,row0,sq_sid,sq_sid,accentColor) : drawRectangle(col3,row0,sq_sid,sq_sid,idleColor);
+    minute & 0b001000 ? drawRectangle(col2,row2,sq_sid,sq_sid,accentColor) : drawRectangle(col2,row2,sq_sid,sq_sid,idleColor);
+    minute & 0b010000 ? drawRectangle(col2,row1,sq_sid,sq_sid,accentColor) : drawRectangle(col2,row1,sq_sid,sq_sid,idleColor);
+    minute & 0b100000 ? drawRectangle(col2,row0,sq_sid,sq_sid,accentColor) : drawRectangle(col2,row0,sq_sid,sq_sid,idleColor);
+
+    hour   & 0b00001  ? drawRectangle(col1,row2,sq_sid,sq_sid,accentColor) : drawRectangle(col1,row2,sq_sid,sq_sid,idleColor);
+    hour   & 0b00010  ? drawRectangle(col1,row1,sq_sid,sq_sid,accentColor) : drawRectangle(col1,row1,sq_sid,sq_sid,idleColor);
+    hour   & 0b00100  ? drawRectangle(col1,row0,sq_sid,sq_sid,accentColor) : drawRectangle(col1,row0,sq_sid,sq_sid,idleColor);
+    hour   & 0b01000  ? drawRectangle(col0,row2,sq_sid,sq_sid,accentColor) : drawRectangle(col0,row2,sq_sid,sq_sid,idleColor);
+    hour   & 0b10000  ? drawRectangle(col0,row1,sq_sid,sq_sid,accentColor) : drawRectangle(col0,row1,sq_sid,sq_sid,idleColor);
+    
+    MicroSecondDelay(1e6);
+  }
+  
+  return EFI_SUCCESS;   
+}