File content as of revision 0:48311ffdfa96:

#include "mbed.h"
Serial Blue(p28,p27);
Serial PC(USBTX,USBRX);
DigitalOut myled(LED1);
DigitalOut myled4(LED4);
 
//global variables for main and interrupt routine
volatile bool readyFlag = true;
volatile int  bnum = 0;
volatile int  bhit  ;
volatile char keyPress;
//state used to remember previous characters read in a button message
enum statetype {start = 0, got_exclm, got_B, got_num, got_hit};
statetype state = start;
//Interrupt routine to parse message with one new character per serial RX interrupt
void parse_message()
{
    keyPress = Blue.getc();
    PC.putc(keyPress);
    readyFlag = true;
    PC.printf("\n\r Value of readyFlag is: %i",readyFlag);
    
    //PC.printf("Value of keyPress is: %c\n\r",keyPress);
}
 
int main()
{
//attach interrupt function for each new Bluetooth serial character
    Blue.attach(&parse_message,Serial::RxIrq);
    while(1) {
        //check for a new button message ready
        if((keyPress=='Z') && (readyFlag))// button Z pressed
        {
            PC.printf("Got an Z");
            readyFlag = false;
            // Play note that corresponds to Z
            }
        else if((keyPress =='X') && (readyFlag)) // button X pressed
            {
                PC.printf("Got an X");
            // Play note that corresponds to X
            }
        else if((keyPress =='C' && (readyFlag)){} // button C pressed
            // Play note that corresponds to C
        else if((keyPress =='V') && (readyFlag)){} // button V pressed
            // Play note that corresponds to V
        else if((keyPress =='B') && (readyFlag)){} // button B pressed
            // Play note that corresponds to B
        else if((keyPress =='N') && (readyFlag)){} // button N pressed
            // Play note that corresponds to N
        else if((keyPress =='M') && (readyFlag)){} // button M pressed
            // Play note that corresponds to M
        else if((keyPress =='O') && (readyFlag)){} // button O pressed
            // Lower an octave
        else if((keyPress =='L') && (readyFlag)){} // button L pressed
            // Raise an octave
        else if((keyPress =='Q') && (readyFlag)){} // button Q pressed
            // Raise Attack Value
        else if((keyPress =='A') && (readyFlag)){} // button A pressed
            // Lower Attack Value
        else if((keyPress =='W') && (readyFlag)){} // button W pressed
            // Raise Delay Value
        else if((keyPress =='S') && (readyFlag)){} // button S pressed
            // Lower Delay Value
        else if((keyPress =='E') && (readyFlag)){} // button E pressed
            // Raise Sustain Value
        else if((keyPress =='D') && (readyFlag)){} // button D pressed
            // Lower Sustain Value
        else if((keyPress =='R') && (readyFlag)){} // button R pressed
            // Raise Release Value
        else if((keyPress =='F') && (readyFlag)){} // button F pressed
            // Lower Release Value
        }
        //do other tasks in main - interrupts will process button message characters
        myled = 1;
        wait(0.1);
        myled = 0;
        wait(0.1);
    
}