Tag Archives: picture

Bitmap to GLCD Hex file >> Output settings

Bitmap2LCD is a tool for programming small Graphic LCDs in embedded systems.

Go to the Main Settings (v2.5 +):

bitmap2lcd settings

From V2.5, the below settings can also be found on the file explorer window, outputs tab : there’s a button at the top right to hide or show this toolbar.

fig 1. Hex file output settings buttons [ Bitmap2LCD from V2.0 upwards ]


Bitmap2LCD is a universal programming tool for converting bitmaps/images to GLCD for most graphic LCD controllers. (Monochrome,Grayscale, and Color ->[Color from V2.0] )

The software converts the bitmap and generates a hexadecimal file according to the previously defined user settings.

Here’s a short description of the available settings :

The hexadecimal output format can be selected with a series of buttons located in the output panel (fig 1.)

Description of the settings:

  • The choice of 8 different vertical or horizontal pagings ( the buttons with the arrows ) , your choice depends of the GLCD controller which is built in your LCD module. ( Please refer to the GLCD controller datasheet )
  • Most significant bit is first or is last (Data bit 7) — or in other words the data endianness.
  • Byte nibble swap On/Off, for example for 16 gray level grayscale mode for Sitronix ST7528 controller compatibility. ( In the case of 2 pixel per data byte, 4 bit per pixel data, gray levels )
  • Negative or positive output setting
  • GLCD zero corner selection (Corner where the conversion starts)
  • Output File Header Editor , (A small script to configure Hex file header)
  • Enable/Disable of the Output Data for compression for monochrome GLCD.
  • Enable/Disable 6 or 8 bit Data byte wide output for T693C Controller

As the converted output can just contain a part of the display size, there are other selectable options (not on fig1.)

  • Enable/disable X,Y area coordinate data insertion in the Hex ouptut file
  • Enable/disable area size data insertion in the Hex output file

These configuration settings are saved when you quit the application and restored on application launch. These settings are also a part of the project specific configuration.

Find other available settings in this topic.




Color GLCD Displays

In color GLCDs, each individual pixel is divided into three cells, or subpixels, which are colored red (R), green (G), and blue (B).

In GLCDs, the most important thing in interfacing color GLCD is to know how color is defined to a given pixel. Available formats depends on the brand and type of GLCD controller built in the choosen module :

12 bit per pixel pixel format (12bpp)
RRRRGGGG  4 bits red and 4 bits green 1st pixel BBBBRRRR   4 bits blue 1st pixel and 4 bits red 2nd  pixel GGGGBBBB  4 bits  green and 4 bits blue 2nd pixel

8 bit per pixel pixel format (8bpp)
RRRGGGBB  3 bits red, 3 bits green and 2 bits blue

16 bit per pixel pixel format (16bpp)
RRRRRGGG  5 bits red and 3 bits green 1st pixel GGGBBBBB  3 bits red and 5 bits blue 1st pixel

The Bitmap2LCD programming tool supports these GLCD color formats from V2.0.