bbea9dadbc
* integrated Peter Fleury's LCD library for HD44780 LCDs * fixed typo * cleanup finished * add documentation * added HD44780 documentation * removed keyboard from .gitmodules * resolved merge conflict * removed edit of kira75s rules.mk made by merge * moved hd44780 to drivers/avr * Added licence info to hd44780 files * Added link to hd44780 docs.
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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.
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.