File content as of revision 9:1501fb01ded6:

#include "mbed.h"
#include "Adafruit_RGBLCDShield.h"
//#include "MCP23017.h"

Serial pc(SERIAL_TX, SERIAL_RX);

MCP23017 mcp23017 = MCP23017(I2C_SDA, I2C_SCL, 0x40);
Adafruit_RGBLCDShield lcd(mcp23017);

enum EExtraChars
{
    eUp = 0,
    eDown,
    eDegree
};

void CreateChars()
{
    uint8_t k_aUp[] = { 0x4,0xe,0x1f,0x15,0x4,0x4,0x4,0x4 };
    uint8_t k_aDown[] = { 0x4,0x4,0x4,0x4,0x15,0x1f,0xe,0x4 };
    uint8_t k_aDegree[] = { 0xc,0x12,0x12,0xc,0x0,0x0,0x0,0x0 };

    lcd.createChar(eUp,k_aUp);
    lcd.createChar(eDown,k_aDown);
    lcd.createChar(eDegree,k_aDegree);    
}

void Initialise()
{
    lcd.begin(16,2);
    CreateChars();

    lcd.setCursor(0,0);
    lcd._putc(eUp);

    lcd.setCursor(0,1);
    lcd._putc(eDown);    
}
    
// Allows to set the backlight, if the LCD backpack is used
void SetBacklight(unsigned char status)
{
    pc.printf("Backlight: %i\r\n", status);
    
    mcp23017.digitalWrite(8, (~(status >> 2) & 0x1));
    mcp23017.digitalWrite(7, (~(status >> 1) & 0x1));
    mcp23017.digitalWrite(6, (~status & 0x1));
}

uint8_t CheckKeys()
{
    static uint8_t lastButtons = lcd.readButtons();
    
    uint8_t buttons = lcd.readButtons();

    if (buttons)
    {
        if (buttons != lastButtons)
        {
            lastButtons = buttons;
        }
            
        lcd.setCursor(2,1);
        
        if (buttons & BUTTON_UP)
        {
            pc.printf("UP ");
            
            lcd.printf("UP ");
        }
        
        if (buttons & BUTTON_DOWN)
        {
            pc.printf("DOWN ");
            
            lcd.printf("DOWN ");
        }
        
        if (buttons & BUTTON_LEFT)
        {
            pc.printf("LEFT ");
            
            lcd.printf("LEFT ");
        }
        
        if (buttons & BUTTON_RIGHT)
        {
            pc.printf("RIGHT ");
            
            lcd.printf("RIGHT ");            
        }
        
        if (buttons & BUTTON_SELECT)
        {
            pc.printf("SELECT ");
            
            lcd.printf("SELECT ");            
        }
        
        lcd.printf("              ");
    }
    
    return buttons;
}

void ShowTemp(int in_nTemp)
{
    lcd.setCursor(2,0);
    lcd.printf("Room: %i%cC     ",in_nTemp,eDegree);    
}

void SetTime
(
    uint8_t     in_nHour,
    uint8_t     in_nMin,
    uint8_t     in_nDay,
    uint8_t     in_nMonth,
    uint16_t    in_nYear
)
{
    tm sCurrentTime = { 0 };
    sCurrentTime.tm_year = in_nYear - 1900;
    sCurrentTime.tm_mon = in_nMonth - 1;
    sCurrentTime.tm_mday = in_nDay;
    
    sCurrentTime.tm_hour = in_nHour;
    sCurrentTime.tm_min = in_nMin;
    
    time_t nCurrentTime = mktime(&sCurrentTime);
    set_time(nCurrentTime);    
}

void ShowTime()
{
    lcd.setCursor(2,1);

    time_t rawtime = time(0);
    tm * timeinfo = localtime(&rawtime);        
    lcd.printf ("%02i:%02i:%02i      ", timeinfo->tm_hour, timeinfo->tm_min, timeinfo->tm_sec);    
}

int main()
{        
    pc.printf("\r\nInitialise LCD\r\n");    
    
    Initialise();

    SetTime(11,48,4,8,2014);
    
    int nTemp = 28;
    ShowTemp(nTemp);

    time_t nLast = 0;
    while (true)
    {
        if (time(0) - nLast > 3)
        {
            ShowTime();
        }

        uint8_t nKeys = CheckKeys();        
        if (nKeys)
        {
            if (nKeys & BUTTON_UP) nTemp++;
            if (nKeys & BUTTON_DOWN) nTemp--;
                        
            ShowTemp(nTemp);            
            nLast = time(0);
        }
            
        wait(0.2);
    }    
}