Integrating Peter Fleury's HD44780 LCD library (#3209)

* 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.

4 files changed, 37 insertions, 0 deletions

diff --git a/quantum/quantum.c b/quantum/quantum.c
index b9934aee8..2bd2c71af 100644
--- a/quantum/quantum.c
+++ b/quantum/quantum.c
@@ -1187,6 +1187,10 @@ void backlight_set(uint8_t level) {}
 
 #endif // backlight
 
+#ifdef HD44780_ENABLED
+#include "hd44780.h"
+#endif
+
 
 // Functions for spitting out values
 //
diff --git a/quantum/quantum.h b/quantum/quantum.h
index 2958a0abd..223846412 100644
--- a/quantum/quantum.h
+++ b/quantum/quantum.h
@@ -121,6 +121,10 @@ extern uint32_t default_layer_state;
         #include "process_terminal_nop.h"
 #endif
 
+#ifdef HD44780_ENABLE
+        #include "hd44780.h"
+#endif
+
 #define STRINGIZE(z) #z
 #define ADD_SLASH_X(y) STRINGIZE(\x ## y)
 #define SYMBOL_STR(x) ADD_SLASH_X(x)
diff --git a/quantum/template/avr/config.h b/quantum/template/avr/config.h
index e739c93c9..ac3174502 100644
--- a/quantum/template/avr/config.h
+++ b/quantum/template/avr/config.h
@@ -187,4 +187,32 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 /* override number of MIDI tone keycodes (each octave adds 12 keycodes and allocates 12 bytes) */
 //#define MIDI_TONE_KEYCODE_OCTAVES 1
 
+/*
+ * 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
+*/ 
+
 #endif
diff --git a/quantum/template/avr/rules.mk b/quantum/template/avr/rules.mk
index 45eb6ee37..d567544c7 100644
--- a/quantum/template/avr/rules.mk
+++ b/quantum/template/avr/rules.mk
@@ -66,3 +66,4 @@ UNICODE_ENABLE = no         # Unicode
 BLUETOOTH_ENABLE = no       # Enable Bluetooth with the Adafruit EZ-Key HID
 AUDIO_ENABLE = no           # Audio output on port C6
 FAUXCLICKY_ENABLE = no      # Use buzzer to emulate clicky switches
+HD44780_ENABLE = no             # Enable support for HD44780 based LCDs (+400)