Display.cpp

/*
* "Drinks" RFID Terminal
* Buy sodas with your company badge!
*
* Benoit Blanchon 2014 - MIT License
* https://github.com/bblanchon/DrinksRfidTerminal
*/

#include <Arduino.h>
#include <LiquidCrystal.h>

#include "Display.h"
#include "Pins.h"

#define SCREEN_COLUMNS     20
#define SELECTION_MAX_LENGTH  (SCREEN_COLUMNS-2)

static LiquidCrystal lcd(PIN_LCD_RS, PIN_LCD_EN, PIN_LCD_D4, PIN_LCD_D5, PIN_LCD_D6, PIN_LCD_D7);

void Display::begin()
{
    pinMode(PIN_LCD_LIGHT, OUTPUT);
    lcd.begin(SCREEN_COLUMNS, 2);
    delay(100);
}

void Display::setText(int line, const char* s)
{
    lcd.setCursor(0, line);

    int i;
    for (i = 0; s[i] && i < SCREEN_COLUMNS; i++)
        lcd.print(s[i]);
    for (; i < SCREEN_COLUMNS; i++)
        lcd.print(' ');
}

void Display::setSelection(int line, const char* s)
{
    int length = strnlen(s, SELECTION_MAX_LENGTH);
    int leftPadding = (SELECTION_MAX_LENGTH - length) / 2;
    int rightPadding = SELECTION_MAX_LENGTH - length - leftPadding;

    lcd.setCursor(0, line);

    lcd.print('<');

    for (int i = 0; i < leftPadding; i++)
        lcd.print(' ');

    lcd.print(s);

    for (int i = 0; i < rightPadding; i++)
        lcd.print(' ');

    lcd.print('>');
}

void Display::setBusy()
{
    setText(0, "Please wait...");
    setText(1, "");
}

void Display::setError()
{
    setText(0, "ERROR !");
    setText(1, "");
}