Matrix Orbital GLK12232-25-SM Legacy - Manual (Page 26)

7.3.3 Upload Font (254 36 [ref] [file size] [file data])
This command begins a font upload to the display’s non-volatile memory. [ref] is the reference number
to be used for this font. File size is a 2 byte value that must be calculated by the host before the transfer takes
place.
7.3.4 Upload Bitmap (254 94[ref] [file size] [file data])
This command begins a bitmap upload to the display’s non-volatile memory. [ref] is the reference
number to be used for this bitmap. File size is a 2 byte value that must be calculated by the host before
the transfer takes place.
7.4 Working with Font Files
A font file consists of a header, a character list and character bitmaps.
The header consists of;
• Placeholder for actual EOF (2 bytes, use 0xFF 0xFF - these bytes will be set to their final value by the
module)
• Nominal character width (1 byte)
• Absolute font height (1 byte)
• ASCII value of first character defined in this file (1 byte)
• ASCII value of last character defined in this file (1 byte)
The character list consists of groups of 3 bytes per character:
• Offset to character bitmap (2 bytes)
• Actual width of this character (1 byte)
7.4.1 Font File in Table Form
The Table below shows the layout of a font file in table form.
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