File content as of revision 0:339986724a03:

#include "LCD.h"

DigitalOut RS(D12);
DigitalOut E(D11);

BusOut data(D5, D4, D3, D2);

void toggle_enable(void)
{
    E=1;
    wait(0.001);
    E=0;
    wait(0.001);
}
//initialize LCD function
void LCD_init(void)
{
    wait(0.02); // pause for 20 ms
    RS=0; // set low to write control data
    E=0; // set low
//function mode
    data=0x2; // 4 bit mode (data packet 1, DB4-DB7)
    toggle_enable();
    data=0x8; // 2-line, 7 dot char (data packet 2, DB0-DB3)
    toggle_enable();
//display mode
    data=0x0; // 4 bit mode (data packet 1, DB4-DB7)
    toggle_enable();
    data=0xF; // display on, cursor on, blink on
    toggle_enable();
//clear display
    data=0x0; //
    toggle_enable();
    data=0x1; // clear
    toggle_enable();
}
//display function
void display_to_LCD(char value)
{
    RS=1; // set high to write character data
    data=value>>4; // value shifted right 4 = upper nibble
    toggle_enable();
    data=value; // value bitmask with 0x0F = lower nibble
    toggle_enable();
}
//locate function
void set_location(char location)
{
    RS=0;
    data=(location|0x80)>>4; // upper nibble
    toggle_enable();
    data=location&0x0F; // lower nibble
    toggle_enable();
}