File content as of revision 1:a6872783beca:

#include "mbed.h"
#include "Speaker.h"
#include "PinDetect.h"
#include "BuzzyGraphics.h"
#include "uLCD_4DGL.h"

////////////////////////////////////////
// Setup instance of LCD display
uLCD_4DGL uLCD(p28, p27, p29); // serial tx, serial rx, reset pin;
////////////////////////////////////////
// Setup instances of push button pins
PinDetect pb_left(p16); 
PinDetect pb_right(p17); 
PinDetect pb_up(p18);
PinDetect pb_down(p19);

Speaker SpeakerOut(p21);
//////////////////////////////////////////////////////////////////////
// Interrupt routine
// used to output next analog sample whenever a timer interrupt occurs
void Sample_timer_interrupt(void)
{
    // send next analog sample out to D to A
    SpeakerOut.PlayNextValue();

}
//---------------------------------------------------------------------------------------------------
// Callback routine is interrupt activated by a debounced pb_left hit
void pb_left_hit_callback (void)
{
    // Tell Buzzy to go left
    //*************
    // Fill in needed Code here
    //*************

}
//---------------------------------------------------------------------------------------------------
// Callback routine is interrupt activated by a debounced pb_right hit
void pb_right_hit_callback (void)
{
    // Tell Buzzy to go right
    //*************
    // Fill in needed Code here
    //*************

}
//---------------------------------------------------------------------------------------------------
// Callback routine is interrupt activated by a debounced pb_up hit
void pb_up_hit_callback (void)
{
    // Tell Buzzy to go up
    //*************
    // Fill in needed Code here
    //*************

}
//---------------------------------------------------------------------------------------------------
// Callback routine is interrupt activated by a debounced pb_down hit
void pb_down_hit_callback (void)
{
    // Tell Buzzy to go down
    //*************
    // Fill in needed Code here
    //*************

}
//---------------------------------------------------------------------------------------------------
int main()
{
    //setup push buttons
    pb_left.mode(PullUp);
    pb_right.mode(PullUp);
    pb_up.mode(PullUp);
    pb_down.mode(PullUp);
    // Delay for initial pullup to take effect
    wait(.01);
    // Setup Interrupt callback functions for a pb hit
    pb_left.attach_deasserted(&pb_left_hit_callback);
    pb_right.attach_deasserted(&pb_right_hit_callback);
    pb_up.attach_deasserted(&pb_up_hit_callback);
    pb_down.attach_deasserted(&pb_down_hit_callback);
    // Setup speaker
    SpeakerOut.period(1.0/200000.0);    

    //Setup LCD display
    uLCD.display_control(PORTRAIT);
    uLCD.background_color(BLACK);
    uLCD.cls();
    uLCD.baudrate(BAUD_3000000); //jack up baud rate to max for fast display
    wait(1.0);
 //   DrawMaze();    
    // Start sampling pb inputs using interrupts
    pb_left.setSampleFrequency();
    pb_right.setSampleFrequency();
    pb_up.setSampleFrequency();
    pb_down.setSampleFrequency();
    // pushbuttons now setup and running
    while(1)
    {
 
    }
} //end main