Music Box Code

// Scout Schultz and Neeta Thawani
// ECE 4180 Final Project - BlueTooth Music Box
// Spring 2017

#include "mbed.h"
#include "rtos.h"
#include "SDFileSystem.h"
#include "wave_player.h"
//#include "uLCD_4DGL.h"
#include "PinDetect.h"
#include <vector>
#include <string>
#include "Motor.h"

//uLCD_4DGL uLCD(p28, p27, p29); // create a global lcd object

SDFileSystem sd(p11, p12, p13, p14, "sd"); //SD card
PwmOut Ctrl(p23);
AnalogOut DACout(p18);

wave_player waver(&DACout);

DigitalOut led1(LED1);
DigitalOut led2(LED2);
DigitalOut led3(LED3);
DigitalOut led4(LED4);

PinDetect lid(p22);

Serial pc(USBTX, USBRX); // tx, rx
Serial  blue(p9,p10);

volatile short paused = 0;
volatile short songnum = 0;
volatile short openLid = 0;
volatile short dancerEnable = 1;
string songname;
vector<string> songs;
float motorSpeed = 0.15f;
float volumeIncrement = 0.2;

//This function is for a thread that handles playing a song.
//Once the song ends, it will automatically play the song stored in songname
//(if songname is unchanged, it will just play the same song again and again)
void songThread(void const *argument)
{
    while(1) {
        FILE *wave_file;
        wave_file=fopen(songname.c_str(),"r");
        waver.play(wave_file);
        fclose(wave_file);
    }

}

void pauseSong()
{
    paused=1;
    Ctrl.write(0);
    waver.pause();
}

void resumeSong()
{
    paused=0;
    if(dancerEnable)
        Ctrl.write(motorSpeed);
    waver.resume();
}

void lidClosed()
{
    short tmp = paused; // preserve whether box was paused or not when opening
    pauseSong();
    openLid=0;
    paused = tmp;
}

void lidOpen()
{
    if(paused==0)
        resumeSong();
    openLid=1;
}

int main()
{
    //basic setup
    lid.mode(PullUp);
    wait(0.01);
    lid.attach_deasserted(&lidClosed);
    lid.attach_asserted(&lidOpen);
    lid.setSampleFrequency(50000); // 50 ms sample rate

    //Scan the directory for .wav files and build a vector of file names
    DIR *d;
    struct dirent *p;

    d = opendir("/sd");
    if (d != NULL) {
        while ((p = readdir(d)) != NULL) {
            //printf(" - %s\n", p->d_name);
            string fname = p->d_name;
            if(fname.find(".wav")!=string::npos) { // if it contains ".wav"
                //printf("%s\n\r",fname);
                songs.push_back("/sd/" + fname);
            }
        }
    } else {
        printf("Could not open directory!\n\r");
    }
    closedir(d);

    // Initialize a thread to handle playing the appropriate song
    songname = songs[0];
    Thread t1(songThread);
    // Check whether song should be playing or not at program start
    Thread::wait(50);
    if(lid==0)
        lidClosed();
    else //lid==0
        lidOpen();

    //Start the main loop, reading serial data from Bluetooth
    char bnum=0;
    while(1) {
        Thread::wait(100);
        led1= !led1;
        if(openLid==1) { //only perform actions if lid is open
            if (blue.getc()=='!' && openLid==1) { //Received a serial input
                if (blue.getc()=='B' && openLid==1) { //Received a button press
                    bnum = blue.getc(); //Save which button was pressed
                    if(blue.getc()=='1' && openLid==1) { //only execute on button press (not release)
                        switch(bnum) {
                            case '1':  //pause/play functionality
                                if(paused)
                                    resumeSong();
                                else //not paused
                                    pauseSong();
                                break;
                            case '2':  //enable/disable dancer
                                if(dancerEnable) { //disable the dancer
                                    dancerEnable=0;
                                    Ctrl.write(0);
                                } else { //enable the dancer
                                    dancerEnable = 1;
                                    if(paused==0)
                                        Ctrl.write(motorSpeed);
                                }
                                break;
                            case '3':  //stop functionality
                                waver.stop();
                                Thread::wait(50);
                                pauseSong();
                                break;
                            case '4':  //reset functionality
                                songnum=0;
                                songname = songs[0];
                                waver.stop();
                                Thread::wait(50);
                                resumeSong();
                                break;
                            case '5':  //increase volume
                                if(waver.getVolume()+volumeIncrement>1.0)
                                    waver.setVolume(1.0);
                                else
                                    waver.setVolume(waver.getVolume()+volumeIncrement);
                                break;
                            case '6':  //decrease volume
                                if(waver.getVolume()-volumeIncrement<0.0)
                                    waver.setVolume(0.0);
                                else
                                    waver.setVolume(waver.getVolume()-volumeIncrement);
                                break;
                            case '7':  //previous song in list
                                songnum--;
                                if(songnum<0) {
                                    songnum=songs.size()-1;
                                }
                                songname = songs[songnum];
                                waver.stop();
                                if(paused)
                                    waver.pause();
                                break;
                            case '8': //next song in list
                                songnum++;
                                if(songnum>=songs.size()) {
                                    songnum=0;
                                }
                                songname = songs[songnum];
                                waver.stop();
                                if(paused)
                                    waver.pause();
                                break;
                        }
                    }
                }
            }
        } else { //if lid is closed
            //flush the buffer
            while(blue.readable()) {
                blue.getc();
            }
            //otherwise it will execute commands immediately once you open box
        }
    }
}