mirror of
https://github.com/qmk/qmk_firmware.git
synced 2024-11-22 11:29:26 +00:00
57 lines
2.9 KiB
Markdown
57 lines
2.9 KiB
Markdown
|
# HD44780 LCD Displays
|
||
|
|
|
||
|
|
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)
|
||
|
|
|
||
|
|
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.
|
||
|
|
|
||
|
|
## Configuration
|
||
|
|
|
||
|
|
You will need to configure the pins used by your display and its number of lines and collumn in your keyboards `config.h`.
|
||
|
|
|
||
|
|
Uncomment the section labled HD44780 and change the parameters as needed.
|
||
|
|
````
|
||
|
|
/*
|
||
|
|
* HD44780 LCD Display Configuration
|
||
|
|
*/
|
||
|
|
|
||
|
|
#define LCD_LINES 2 //< number of visible lines of the display
|
||
|
|
#define LCD_DISP_LENGTH 16 //< visibles characters per line of the display
|
||
|
|
#define LCD_IO_MODE 1 //< 0: memory mapped mode, 1: IO port mode
|
||
|
|
#if LCD_IO_MODE
|
||
|
|
#define LCD_PORT PORTB //< port for the LCD lines
|
||
|
|
#define LCD_DATA0_PORT LCD_PORT //< port for 4bit data bit 0
|
||
|
|
#define LCD_DATA1_PORT LCD_PORT //< port for 4bit data bit 1
|
||
|
|
#define LCD_DATA2_PORT LCD_PORT //< port for 4bit data bit 2
|
||
|
|
#define LCD_DATA3_PORT LCD_PORT //< port for 4bit data bit 3
|
||
|
|
#define LCD_DATA0_PIN 4 //< pin for 4bit data bit 0
|
||
|
|
#define LCD_DATA1_PIN 5 //< pin for 4bit data bit 1
|
||
|
|
#define LCD_DATA2_PIN 6 //< pin for 4bit data bit 2
|
||
|
|
#define LCD_DATA3_PIN 7 //< pin for 4bit data bit 3
|
||
|
|
#define LCD_RS_PORT LCD_PORT //< port for RS line
|
||
|
|
#define LCD_RS_PIN 3 //< pin for RS line
|
||
|
|
#define LCD_RW_PORT LCD_PORT //< port for RW line
|
||
|
|
#define LCD_RW_PIN 2 //< pin for RW line
|
||
|
|
#define LCD_E_PORT LCD_PORT //< port for Enable line
|
||
|
|
#define LCD_E_PIN 1 //< pin for Enable line
|
||
|
|
#endif
|
||
|
|
````
|
||
|
|
|
||
|
|
Should you need to configure other properties you can copy them from `quantum/hd44780.h` and set them in your `config.h`
|
||
|
|
|
||
|
|
## Usage
|
||
|
|
|
||
|
|
To initialize your display call lcd_init() with one of these parameters:
|
||
|
|
````
|
||
|
|
LCD_DISP_OFF : display off
|
||
|
|
LCD_DISP_ON : display on, cursor off
|
||
|
|
LCD_DISP_ON_CURSOR : display on, cursor on
|
||
|
|
LCD_DISP_ON_CURSOR_BLINK : display on, cursor on flashing
|
||
|
|
````
|
||
|
|
This is best done in your keyboards `matrix_init_kb` or your keymaps `matrix_init_user`.
|
||
|
|
It is advised to clear the display before use.
|
||
|
|
To do so call `lcd_clrsrc()`.
|
||
|
|
|
||
|
|
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")`.
|
||
|
|
|
||
|
|
There are more posible methods 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)
|