Luke Fink
inital commit
Dependencies: mbed wave_player mbed-rtos 4DGL-uLCD-SE SDFileSystem2 PinDetect MMA8452
Diff: main.cpp
- Revision:
- 11:1a47726ac72a
- Parent:
- 10:5bd6abd66d12
diff -r 5bd6abd66d12 -r 1a47726ac72a main.cpp
--- a/main.cpp Sun Dec 12 23:31:10 2021 +0000
+++ b/main.cpp Wed Dec 15 17:17:26 2021 +0000
@@ -1,362 +1,415 @@
+/**
+ * @file main.cpp
+ * @authors Christopher Rothmann (chrisrothmann@gatech.edu) & Luke Fink (lfink6@gatech.edu)
+ * @brief C++ Code to create an MP3 player from an mBED
+ * @version 1.0
+ * @date 2021-12-13
+ *
+ * @copyright Copyright (c) 2021
+**/
+
+
+// Define included libraries; all libraries below must be compiled together
+// Note: Some libraries have been updated to work with this code. Ensure all libraries
+// are the correct by using those included in this github
#include "mbed.h"
#include "rtos.h"
#include "SDFileSystem.h"
#include "uLCD_4DGL.h"
#include "wave_player.h"
-#include "LSM9DS1.h"
+#include "MMA8452.h"
#include "PinDetect.h"
#include <string>
#include <vector>
-DigitalOut myled(LED1);
-RawSerial blue(p28,p27);
+// Defining mBED inputs & outputs
-SDFileSystem sd(p5, p6, p7, p8, "sd"); //SD card
-uLCD_4DGL uLCD(p13,p14,p11);
-
-LSM9DS1 imu(p9, p10, 0xD6, 0x3C);
-Serial pc(USBTX, USBRX);
+// mBED LED Outputs for Audiovisualizer/Testing & Diagnostics
+DigitalOut led1(LED1);
+DigitalOut led2(LED2);
+DigitalOut led3(LED3);
+DigitalOut led4(LED4);
-PinDetect playpause(p23);
-PinDetect menu(p26);
-PinDetect skip(p25);
-PinDetect back(p30);
-Mutex LCD;
-Mutex Speaker;
-Mutex avgs;
-Mutex mentex;
+// Pushbuttons for MP3 Player Controls
+PinDetect prev(p21);
+PinDetect next(p22);
+PinDetect shuffle(p23);
+PinDetect play(p24);
+// Serial & Analog Inputs & Ouputs for Data Communication
+RawSerial blueTooth(p28,p27);
+Serial pc(USBTX, USBRX);
+SDFileSystem sd(p5, p6, p7, p12, "sd");
+uLCD_4DGL uLCD(p13,p14,p11);
+MMA8452 acc(p9, p10, 100000);
AnalogOut DACout(p18);
+wave_player waver(&DACout);
-wave_player waver(&DACout);
+
+// Defining Internal Global Variables
bool playing = false;
-bool play = 1;
-bool menu1 = 0;
-bool inmenu=0;
-int currentsong = 0;
-int avgIMU;
-int avgMic;
-int songcount;
-vector <string> songList; // vector of songs to index
-string dir = "/sd/myMusic/";
+int currentSong = 0;
+int songCount = 0;
+vector<string> songList;
+unsigned short max_range = 0xFFFF;
+
+// Defining Functions
-class microphone
-{
-public :
- microphone(PinName pin);
- float read();
- operator float ();
-private :
- AnalogIn _pin;
-};
-microphone::microphone (PinName pin):
- _pin(pin)
-{
-}
-float microphone::read()
-{
- return _pin.read();
-}
-inline microphone::operator float ()
-{
- return _pin.read();
-}
-
-microphone mymicrophone(p16);
-void LCDThread(void const *argument)
+/**
+ * @brief Increments integer variable currentSong by one, while circling back to first song at end of list
+ * @details Function is called both when "next song" pushbutton pressed or bluetooth command is sent;
+ * LED1 switches value when called for diagnostics & testing
+**/
+void nextSong()
{
- while(1){
- Speaker.lock();
- if(!menu1)
- {
- Speaker.unlock();
- LCD.lock();
- uLCD.cls();
- uLCD.locate(1,1);
- uLCD.printf("%s",songList[currentsong].substr(0,songList[currentsong].find(".wav")));
- if(play)
- {
- //play
-
- uLCD.filled_rectangle(0,118,280,40,BLACK);
- uLCD.triangle(120, 100, 40, 40, 10, 100, 0x0000FF);
- }
- else
- {
- //pause
- uLCD.filled_rectangle(0,118,110,40,WHITE);
- uLCD.filled_rectangle(50,118,100,40,BLACK);
- uLCD.filled_rectangle(180,118,280,40,WHITE);
- }
- LCD.unlock();
- }
- else
- {
-
- Speaker.unlock();
- mentex.lock();
- LCD.lock();
- uLCD.cls();
- LCD.unlock();
- for(int i=-1; i<2; i++)
- {
- //add code to display and scroll through menu here
-
- mentex.lock();
- if(currentsong+i>=0)
- {
- if(currentsong+i<songcount)
- {
- LCD.lock();
- uLCD.printf("%s\r\n\r\n", songList[currentsong+i].substr(0,songList[currentsong + i].find(".wav")));
- LCD.unlock();
- }
- else
- {
- LCD.lock();
- uLCD.printf("%s\r\n\r\n", songList[0].substr(0,songList[0].find(".wav")));
- LCD.unlock();
- }
- }
- else if(currentsong+i<0)
- {
- LCD.lock();
- uLCD.printf("%s\r\n\r\n", songList[songcount-1].substr(0,songList[songcount-1].find(".wav")));
- LCD.unlock();
- }
-
- }
- mentex.unlock();
- LCD.lock();
- uLCD.locate(2,3);
- uLCD.printf("%s", "^^^");
- LCD.unlock();
- }
- Thread::wait(500);
- }
-}
-void buttonThread()
-{
- //add playpause and skip features here
- Speaker.lock();
- if(!menu1)
+ //led1 = !led1;
+ if (currentSong == songCount - 1)
{
- playing=!playing;
- play=!playing;
+ currentSong = 0;
}
else
{
- playing=!playing;
- Thread::wait(500);
- playing=!playing;
+ currentSong++;
}
- myled=play;
- Speaker.unlock();
- Thread::wait(10);
}
-void skipThread()
+
+/**
+ * @brief Increments integer variable currentSong by minus one, while circling back to last song at zero
+ * @details Function is called both when "previous song" pushbutton pressed or bluetooth command is sent;
+ * LED2 switches value when called for diagnostics & testing
+**/
+void prevSong()
{
- //add skip features
-
- Speaker.lock();
- if(currentsong<songcount-1)
+ //led2 = !led2;
+ if (currentSong == 0)
{
- currentsong++;
+ currentSong = songCount - 1;
}
else
{
- currentsong=0;
- }
- if(!menu1)
- {
- playing=true;
- play=!playing;
- }
- Speaker.unlock();
-}
-void backThread()
-{
- Speaker.lock();
- if(currentsong!=0)
- {
- currentsong--;
+ currentSong--;
}
- else
- {
- currentsong=songcount-1;
- }
- if(!menu1)
- {
- playing=true;
- play=!playing;
- }
- Speaker.unlock();
}
-void menuThread()
-{
- menu1=!menu1;
-}
-void BlueThread(void const *argument)
-{
- //add bluetooth control code here
- char bnum =0;
- char bhit=0;
- while(1)
- {
+
- if(blue.readable()&&blue.writeable())
- {
- if (blue.getc()=='!') {
- if (blue.getc()=='B') { //button data
- bnum = blue.getc(); //button number
- bhit=blue.getc();
- if ((bnum>='1')&&(bnum<='4')) //is a number button 1..4
- {
- LCD.lock();
- uLCD.printf("%s", "test lol");
- LCD.unlock();
- switch (bnum)
- {
- case '1': //number button 1 //add playpause and skip features here
- if (bhit=='1') {
- Speaker.lock();
- if(play)
- {
- playing = false;
- }
- else
- {
- playing = true;
- }
- play=!play;
- myled=play;
- Speaker.unlock();
- Thread::wait(10);
- }
- break;
- case '2': //number button 2
- if (bhit=='1') {
- mentex.lock();
- if(currentsong<songcount-1)
- {
- currentsong++;
- }
- else
- {
- currentsong=0;
- }
- if(!menu)
- {
- playing=true;
- play=true;
- }
- mentex.unlock();
- }
- break;
- case '3': //number button 3
- if (bhit=='1') {
- mentex.lock();
- if(currentsong!=0)
- {
- currentsong--;
- }
- else
- {
- currentsong=songcount-1;
- }
- if(!menu)
- {
- playing=true;
- play=true;
- }
- mentex.unlock();
- }
- break;
- case '4': //number button 4
- if (bhit=='1') {
- mentex.lock();
- menu1=!menu1;
- mentex.unlock();
- }
- break;
- default:
- break;
- }
- }
-
- }
- }
- }
- Thread::wait(1000);
- }
-}
-void IMUThread(void const *argument)
+/**
+ * @brief Switches boolean variable playing
+ * @details Function is called both when "pause/play" pushbutton pressed or bluetooth command is sent;
+ * LED3 switches value when called for diagnostics & testing
+**/
+void playSong()
{
- while(1){
- avgs.lock();
- //put imu averaging and next track selection code here if that is selected
- avgMic = int(((abs((mymicrophone - (0.67/3.3)))*500.0)+avgMic)/2);
- imu.readAccel();
- avgIMU=int((((imu.ax+imu.az+imu.ay)/3.0)+avgIMU)/2);
- avgs.unlock();
- Thread::wait(5000);
- }
-
+ //led3 = !led3;
+ playing = !playing;
}
-int main()
+/**
+ * @brief Generates random integer within song list range to assign integer variable currentSong
+ * @details Function is called both when "shuffle song" pushbutton pressed or bluetooth command is sent;
+ * function seeds a true random value through the noise present on the 5th decimal place of an
+ * accelerometer's input values;
+ * LED4 switches value when called for diagnostics & testing
+**/
+void shuffleSong()
{
+ //led4 = !led4;
+ double x, y, z;
+ acc.readXYZGravity(&x,&y,&z);
+ currentSong = int(100000 * (x + y + z)) % songCount;
+}
+
+// Defining Threads
+
+/**
+ * @brief Updates LCD screen according to user input & selections
+ * @details First configures LCD screen layout & songlist, then continously checks for changes in global variables
+ * integer currentSong & boolean playing to update LCD screen accordingly. No updates made if no changes found.
+ * All LCD communications occur strictly in this thread.
+ * @param *arguments Input arguments to thread used for RTOS thread library. Not needed to understand thread code.
+ */
+void LCDThread(void const *argument)
+{
+ // Configure LCD screen
uLCD.cls();
uLCD.baudrate(3000000);
uLCD.background_color(BLACK);
+ uLCD.color(WHITE);
uLCD.text_width(1);
- uLCD.text_height(1);
- imu.begin();
- if (!imu.begin()) {
- //set fail flag for imu here
+ uLCD.text_height(1);
+
+ // Print Song List to LCD Screen
+ uLCD.locate(0,0);
+ uLCD.printf("Song List: ");
+ uLCD.locate(0,1);
+ uLCD.printf("->");
+ for(int i = 0; i < songCount; i++)
+ {
+ uLCD.locate(3,i+1);
+ uLCD.printf("%s\n\r", songList[i].substr(0,songList[i].find(".wav")));
+ }
+
+ // Print "NOW PLAYING: " & "STATUS: " feature; initialize to first song on SD card & paused
+ uLCD.locate(0,12);
+ uLCD.printf("NOW PLAYING:");
+ uLCD.locate(0,13);
+ uLCD.printf("%s", songList[currentSong].substr(0,songList[currentSong].find(".wav")));
+ uLCD.locate(0,14);
+ uLCD.printf("STATUS: PAUSED");
+
+ // Initialize internal thread variables to check for changes to external global variables
+ bool prevPlayLCD = false;
+ int previousSongLCD = 0;
+
+ // Thread while loop to continously check for changes and update screen accordingly
+ while (true)
+ {
+ // Check if new song has been selected
+ if (previousSongLCD != currentSong)
+ {
+ // Update "NOW PLAYING: " feature
+ uLCD.locate(0,12);
+ uLCD.printf("NOW PLAYING:");
+ uLCD.locate(0,13);
+ uLCD.printf("%s ", songList[currentSong].substr(0,songList[currentSong].find(".wav")));
+ // Update "->" feature
+ uLCD.locate(0, previousSongLCD + 1);
+ uLCD.printf(" ");
+ uLCD.locate(0, currentSong + 1);
+ uLCD.printf("->");
+ // Set internal change check to currentSong
+ previousSongLCD = currentSong;
+ }
+ //Check if change to play/pause status
+ if (prevPlayLCD != playing)
+ {
+ // Update "STATUS: " feature
+ uLCD.locate(0,14);
+ if (playing)
+ {
+ uLCD.printf("STATUS: PLAYING");
+ }
+ else
+ {
+ uLCD.printf("STATUS: PAUSED ");
+ }
+ // Set internal change check to playing
+ prevPlayLCD = playing;
+ }
+ Thread::wait(50);
}
- imu.calibrate();
- blue.baud(9600);
+}
+
+/**
+ * @brief Updates phone screen to latest currentSong playing, sends phone commands to mBED, all over BlueTooth
+ * @details See commenting in thread for step-by-step approach
+ * All BlueTooth communications occur strictly in this thread
+ * BlueTooth Control Pad Module Controls: 1 = Pause/Play, 2 = Next Song, 3 = Previous Song, 4 = Shuffle Song
+ * @param *arguments Input arguments to thread used for RTOS thread library. Not needed to understand thread code.
+ */
+void BluetoothThread(void const *argument)
+{
+ // Initialize internal thread variable to check for changes to external global variables
+ int previousSongBLE = 0;
+ // Thread while look to continously check for BlueTooth commands and update currentSong on phone
+ while (true)
+ {
+ // Update currentSong on phone
+ if (blueTooth.writeable())
+ {
+ // Check if new song has been selected
+ if (previousSongBLE != currentSong)
+ {
+ // Send currentSong name over BlueTooth
+ string str = "Current Song: ";
+ for (int i = 0; i < 14; i++)
+ {
+ blueTooth.putc(str[i]);
+ }
+ for (int i = 0; i < songList[currentSong].size() - 4; i++)
+ {
+ blueTooth.putc(songList[currentSong][i]);
+ }
+ blueTooth.putc('\n');
+ previousSongBLE = currentSong;
+ }
+
+ }
+ // Read in commands from BlueTooth module
+ if (blueTooth.readable())
+ {
+ // Check for '!B' to be compatible with "Control Pad" Module serial output
+ if (blueTooth.getc()=='!')
+ {
+ if (blueTooth.getc()=='B')
+ {
+ // Check which command was hit
+ char bnum = blueTooth.getc();
+ // Ensure mBED only updates on release, not hit
+ char bhit = blueTooth.getc();
+ if (bhit == '0')
+ {
+ switch (bnum)
+ {
+ case '1':
+ playSong();
+ break;
+
+ case '2':
+ nextSong();
+ break;
+
+ case '3':
+ prevSong();
+ break;
+
+ case '4':
+ shuffleSong();
+ break;
+
+ default:
+ break;
+ }
+ }
+ }
+ }
+ }
+ Thread::wait(50);
+ }
+}
+
+/**
+ * @brief Updates Mbed LEDs to show current volume level
+ * @details Read and scales analogOut level, then sets leds to show the level in 4 tiers.
+ * @param *arguments Input arguments to thread used for RTOS thread library. Not needed to understand thread code.
+ */
+void AudioVisualizerThread(void const *argument)
+{
+ while(1)
+ {
+ if(playing)
+ {
+ float level = (DACout.read() - 0.25f) * 3.3f;
+ if(level<0.825)
+ {
+ led1=true;
+ led2=led3=led4=false;
+ }
+ else if(level>0.825&&level<1.65)
+ {
+ led1=led2=true;
+ led3=led4=false;
+ }
+ else if(level>1.65&&level<2.47)
+ {
+ led1=led2=led3=true;
+ led4=false;
+ }
+ else if(level>2.47)
+ {
+ led1=led2=led3=led4=true;
+ }
+ Thread::wait(50);
+ }
+ }
+}
+
+// Button Interupt Functions
+
+/**
+ * @brief runs nextSong() function on pushbotton hit. Attached using PinDetect.
+**/
+void nextInt()
+{
+ nextSong();
+}
+
+/**
+ * @brief runs prevSong() function on pushbotton hit. Attached using PinDetect.
+**/
+void prevInt()
+{
+ prevSong();
+}
+
+/**
+ * @brief runs playSong() function on pushbotton hit. Attached using PinDetect.
+**/
+void playInt()
+{
+ playSong();
+}
+
+/**
+ * @brief runs shuffleSong() function on pushbotton hit. Attached using PinDetect.
+**/
+void shuffleInt()
+{
+ shuffleSong();
+}
+
+/**
+ * @brief Program main routine.
+ * @return int No return expected.
+ */
+int main()
+{
+ // Attach & configure interupts to pushbuttons
+ next.mode(PullUp);
+ prev.mode(PullUp);
+ play.mode(PullUp);
+ shuffle.mode(PullUp);
+ next.attach_deasserted(&nextInt);
+ prev.attach_deasserted(&prevInt);
+ play.attach_deasserted(&playInt);
+ shuffle.attach_deasserted(&shuffleInt);
+ next.setSampleFrequency();
+ prev.setSampleFrequency();
+ play.setSampleFrequency();
+ shuffle.setSampleFrequency();
+ // Wait 10 milliseconds to ensure functions are attached
+ Thread::wait(10);
+ // Extract file list from SD Card, place in vector<string> songList
DIR *dp;
struct dirent *dirp;
dp = opendir("/sd/myMusic");
- songcount = 0;
if(dp !=NULL)
{
while ((dirp = readdir(dp)) != NULL) {
songList.push_back(string(dirp->d_name));
- //uLCD.printf("\r%s\r\n", string(dirp->d_name));
- songcount++;
+ songCount++;
}
}
- playpause.mode(PullUp);
- playpause.attach_deasserted(&buttonThread);
- playpause.setSampleFrequency();
+ // Wait 10 miliseconds to ensure SD card communication complete
+ Thread::wait(10);
- menu.mode(PullUp);
- menu.attach_deasserted(&menuThread);
- menu.setSampleFrequency();
- skip.mode(PullUp);
- skip.attach_deasserted(&skipThread);
- skip.setSampleFrequency();
- back.mode(PullUp);
- back.attach_deasserted(&backThread);
- back.setSampleFrequency();
- //LCD, Player, button Interrupt, bluetooth, imu+mic
+ // Start LCD & BlueTooth Thread
Thread thread1(LCDThread);
- Thread thread4(BlueThread);
- Thread thread5(IMUThread);
- while(1){
- FILE *wave_file;
- Thread::wait(1000);
- mentex.lock();
- string selectedSong= "/sd/myMusic/" + songList[currentsong];
- mentex.unlock();
- const char* song = selectedSong.c_str();
- wave_file=fopen(song,"r");
- if(wave_file==NULL) uLCD.printf("file open error!\n\n\r");
- waver.play(wave_file);
- fclose(wave_file);
+ Thread thread2(BluetoothThread);
+ Thread thread3(AudioVisualizerThread);
+
+ // Main while loop:
+ // Main loop is now considered the Speaker Thread, playing/pausing current song
+ // based on changes in global varaibles boolean playing & integer currentSong
+ while (true)
+ {
+ // Read in selected file
+ FILE *wave_file;
+ string selectedSong= "/sd/myMusic/" + songList[currentSong];
+ const char* song = selectedSong.c_str();
+ wave_file=fopen(song,"r");
+ if(wave_file==NULL)
+ {
+ uLCD.locate(0,12);
+ uLCD.printf("file open error!");
+ }
+ // Wait 10 miliseconds to ensure file properly loaded
+ Thread::wait(10);
+ // Play file; stop/play feature built into waver library
+ waver.play(wave_file);
+ // Close file
+ fclose(wave_file);
+ // Reset playing variable so song does not repeat
+ playing = false;
}
}
\ No newline at end of file