Establishing a custom character library The character LCD module allows the user to create eight 5x8 dot matrix characters in the HD44780 on-chip CGRAM (64 bytes OOH-3FH), so that we can also write a few simple Chinese characters or symbols to On the display. There are three steps to building a custom character library:
Step 1: Create a font array of custom characters, for example, use a bitmap to get the font (byte) in the CGTAB table below; Step 2: Define the character code of each character, for example, the semicolon ";" in the CGTAB table below. The latter definition is the character code; Step 3: Write the font data into the CGRAM, the subroutine is as follows;
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