57 lines
2.9 KiB
Markdown
57 lines
2.9 KiB
Markdown
# HD44780 LCD Displays
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This is an integration of Peter Fleury's LCD library. This page will explain the basics. [For in depth documentation visit his page.](http://homepage.hispeed.ch/peterfleury/doxygen/avr-gcc-libraries/group__pfleury__lcd.html)
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You can enable support for HD44780 Displays by setting the `HD44780_ENABLE` flag in your keyboards `rules.mk` to yes. This will use about 400 KB of extra space.
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## Configuration
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You will need to configure the pins used by your display, and its number of lines and columns in your keyboard's `config.h`.
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Uncomment the section labled HD44780 and change the parameters as needed.
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````
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/*
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* HD44780 LCD Display Configuration
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*/
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#define LCD_LINES 2 //< number of visible lines of the display
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#define LCD_DISP_LENGTH 16 //< visibles characters per line of the display
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#define LCD_IO_MODE 1 //< 0: memory mapped mode, 1: IO port mode
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#if LCD_IO_MODE
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#define LCD_PORT PORTB //< port for the LCD lines
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#define LCD_DATA0_PORT LCD_PORT //< port for 4bit data bit 0
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#define LCD_DATA1_PORT LCD_PORT //< port for 4bit data bit 1
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#define LCD_DATA2_PORT LCD_PORT //< port for 4bit data bit 2
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#define LCD_DATA3_PORT LCD_PORT //< port for 4bit data bit 3
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#define LCD_DATA0_PIN 4 //< pin for 4bit data bit 0
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#define LCD_DATA1_PIN 5 //< pin for 4bit data bit 1
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#define LCD_DATA2_PIN 6 //< pin for 4bit data bit 2
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#define LCD_DATA3_PIN 7 //< pin for 4bit data bit 3
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#define LCD_RS_PORT LCD_PORT //< port for RS line
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#define LCD_RS_PIN 3 //< pin for RS line
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#define LCD_RW_PORT LCD_PORT //< port for RW line
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#define LCD_RW_PIN 2 //< pin for RW line
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#define LCD_E_PORT LCD_PORT //< port for Enable line
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#define LCD_E_PIN 1 //< pin for Enable line
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#endif
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````
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Should you need to configure other properties you can copy them from `quantum/hd44780.h` and set them in your `config.h`
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## Usage
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To initialize your display, call `lcd_init()` with one of these parameters:
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````
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LCD_DISP_OFF : display off
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LCD_DISP_ON : display on, cursor off
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LCD_DISP_ON_CURSOR : display on, cursor on
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LCD_DISP_ON_CURSOR_BLINK : display on, cursor on flashing
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````
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This is best done in your keyboards `matrix_init_kb` or your keymaps `matrix_init_user`.
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It is advised to clear the display before use.
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To do so call `lcd_clrsrc()`.
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To now print something to your Display you first call `lcd_gotoxy(column, line)`. To go to the start of the first line you would call `lcd_gotoxy(0, 0)` and then print a string with `lcd_puts("example string")`.
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There are more methods available to control the display. [For in depth documentation please visit the linked page.](http://homepage.hispeed.ch/peterfleury/doxygen/avr-gcc-libraries/group__pfleury__lcd.html)
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