Ryan Sartin
This program utilizes an LCD, RPG, 8 ohm speaker, and SD card to provide the basic functions of a music player. The project cycles through the SD card for .wav files and tracks elapsed time. See http://mbed.org/users/rsartin3/notebook/audio-player/ for more information.
Dependencies: DebounceIn RPG SDFileSystem TextLCD mbed wav_header wave_player
Revision 0:040129c3d961, committed 2013-03-04
- Comitter:
- rsartin3
- Date:
- Mon Mar 04 22:37:29 2013 +0000
- Child:
- 1:f31b40073d35
- Commit message:
- Working version with clock;
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/DebounceIn.lib Mon Mar 04 22:37:29 2013 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/AjK/code/DebounceIn/#1f3e0982f89d
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/RPG.lib Mon Mar 04 22:37:29 2013 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/canderson199/code/RPG/#0b389c2c21b5
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/SDFileSystem.lib Mon Mar 04 22:37:29 2013 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/SDFileSystem/#c8f66dc765d4
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/TextLCD.lib Mon Mar 04 22:37:29 2013 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/simon/code/TextLCD/#44f34c09bd37
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Mon Mar 04 22:37:29 2013 +0000
@@ -0,0 +1,351 @@
+/*
+ MUSIC PLAYER HOORAY
+ wumbo
+*/
+
+#include "mbed.h"
+#include "DebounceIn.h"
+#include "SDFileSystem.h"
+#include "wave_player.h"
+#include "TextLCD.h"
+#include "RPG.h"
+#include "Wav_Support_File.h"
+#include "string"
+
+// Debug mode on: 1
+#define DEBUG 0
+
+// -- Debug I/O --
+DigitalOut myled(LED1);
+DigitalOut myled2(LED2);
+DigitalOut myled3(LED3);
+DigitalOut myled4(LED4);
+Serial pc(USBTX, USBRX);
+
+// -- RPG I/O --
+RPG rpg(p17, p16, p19);
+
+// -- Text LCD I/O --
+TextLCD lcd(p25, p26, p27, p28, p29, p30); // rs, e, d4-d7
+
+// -- SD card I/O --
+SDFileSystem sd(p5, p6, p7, p8, "sd"); // the pinout on the mbed Cool Components workshop board
+DigitalIn sdDetect(p9); // Grounded if no card is inserted, Requires pull up
+
+// -- Wave Player I/O --
+AnalogOut DACout(p18);
+wave_player waver(&DACout);
+
+// Timer Junk
+Ticker songTick;
+time_t time_i;
+
+struct playlist {
+ // Doubly-linked list to easily traverse between filenames
+ char s_name[30]; // File name without .wav extension
+ playlist *prev; // Pointer to next filename
+ playlist *next; // Pointer to previous filename
+}; // Structure name courtesy of Layla Marshall
+
+void insert( struct playlist *root, string songName)
+{
+ /* Insert
+ Put a new songname at the end of the linked list
+ @param *head: Pointer to root node of playlist
+ @param songName: String holding the song name to be inserted
+ */
+ playlist *new1=(playlist *) malloc(sizeof(playlist)); // Create new playlist node
+ playlist *temp = root; // Start at root node
+
+ while(temp -> next != NULL)
+ {
+ temp = temp -> next; // Traverse playlist until at last node
+ }
+
+ strcpy(new1 -> s_name, songName.c_str()); // Copy song name into the file name of the node
+ new1 -> next = NULL; // Set next pointer as null
+ new1 -> prev = temp; // Set previous pointer to the last mode
+ temp -> next = new1; // Hhave last node point to newly created node
+};
+
+int createPlaylist(const char *location, playlist *root) {
+ /* createPlaylist
+ Read from given directory and if a file has a .wav extension, add it to the playlist. Output the number of songs added to playlist
+ @param *location: Location to look for .wav files, tested for base SD card directory "/sd/"
+ @param *root: Pointer to root of a playlist. The playlist should be empty except for the root node which will be overwritten
+ @out count: Outputs the number of songs added to the playlist
+ */
+ DIR *d; // Directory pointer
+ dirent *file; // dirent to get file name
+ // playlist *curr = root; //
+ int count = 0; // count of songs added to playlist
+
+ if(DEBUG) pc.printf("\n\rWell... Let's get started!\r\n");
+ if((d = opendir(location)) == NULL) { //Attempt to open directory at given location
+ // If Error
+ lcd.cls();
+ lcd.printf("Unable to open directory!");
+ if(DEBUG) pc.printf("[!] Unable to open directory\r\n");
+ }else{
+ // If Successful
+ while((file = readdir(d)) !=NULL) { // While able to read files in directory
+ if(DEBUG) pc.printf("Parsing file: %s\n\r", file->d_name);
+
+ string str(file->d_name); // Parse filename
+ size_t exten = str.find_last_of("."); // Find final '.'
+
+ if(DEBUG) pc.printf("path: %s\n\r", (str.substr(0,exten)).c_str()); // Prints everything before final '.'
+ if(DEBUG) pc.printf("file: %s\n\r", (str.substr(exten+1)).c_str()); // Prints everything after final '.'
+
+ // If the extension is wav or WAV, add to playlist. Otherwise read in next file
+ if((str.substr(exten+1)).compare("wav") == 0 || (str.substr(exten+1)).compare("WAV") == 0 ){
+ if(DEBUG) pc.printf("This is a file that I like very much!\r\n");
+
+ if(count == 0){ // If still at root node
+ count++; // Increment count
+ strcpy(root->s_name, (str.substr(0,exten)).c_str()); //Copy filename into root node
+ // curr = root;
+ }else{
+ count++; // Increment count
+ insert(root,str.substr(0,exten)); // Add new song to playlist
+ }
+ }
+ }
+ closedir(d); // Close directory
+ }
+ return count; //Return number of songnames added to playlist
+}
+
+void printList(playlist *root) {
+ /* printList
+ (DEBUG function) Traverses the playlist and writes all songnames to the pc
+ @param *root: pointer to playlist to print
+ */
+ int count = 1; // Track number, starts at 1
+ struct playlist *curr = root; // playlist node used to traverse playlist
+ pc.printf("\n\rPrinting File Names:\n\r");
+ pc.printf("Track #%d: %s\n\r", count, curr->s_name); //Root node song name
+
+ while(curr -> next != NULL) { // While there is a following node...
+ curr = curr -> next; // Move to it
+ count++; // Increment song count
+ pc.printf("Track #%d: %s\n\r", count, curr->s_name); // And print the current song name
+ }
+}
+
+void freeList(playlist ** root) {
+/* freeList
+ * Deallocate playlist structure memory, including root node
+ * Sets root pointer to NULL so old memory location cannot be accessed
+ * usage: freeList(&root);
+ */
+
+playlist * node = *root;
+playlist * temp;
+
+if(node == NULL)
+ return; // Protect against an empty root node (no playlist)
+
+ while(node != NULL) {
+ temp = node->next;
+ free(node);
+ node = temp;
+ }
+ *root = NULL;
+}
+
+void deleteList(playlist * root) {
+/* deleteList
+ * Deallocates all non-root playlist structures, leaving the root
+ * node with a default "No wavefile" string and null'ed pointers
+ */
+
+if(root == NULL)
+ return;
+
+ freeList(&(root->next));
+
+ root->next = NULL;
+ root->prev = NULL;
+ strcpy(root->s_name, "No wavefile");
+}
+
+void songClock() {
+ time_t time_f;
+ time_f = time(NULL);
+
+ // if(DEBUG) printf("Time Elapsed: %d. (Start: %d, Stop: %d)\n\r", time_f - time_i, time_i, time_f);
+ lcd.locate(6,1);
+ lcd.printf("%d", time_f - time_i + 1);
+
+}
+
+int main() {
+ // --- Control Variables ---
+ int songCount = 0; // Number of songs in the playlist linked list
+
+ bool sdInsert = false;
+ bool firstList = false; // Is it first instance of reading from SD card
+ bool playlistExist = false;
+
+ int rpgTick = 0; // Slow down RPG turning speed
+ const int rpgThresh = 5;
+
+ FILE *wave_file;
+ string mySongName = "Invalid";
+ unsigned char wave_array[30];
+
+
+ // --- Debug That Junk ---
+ lcd.printf("Hello World!");
+ if(DEBUG) pc.printf("Hello World!\n\r");
+
+ // --- Initialize Playlist ---
+ struct playlist *root; // Create root node
+ root = (playlist *)malloc(sizeof(struct playlist));
+ root -> next = NULL; // Only node
+ root -> prev = NULL;
+ strcpy(root->s_name, "No wavefile"); // Put song name as "No wavfile"
+ if(DEBUG) printList(root);
+
+ struct playlist *curr = root; // Current node for playlist traversal
+
+ // --- Internal Pull-ups ---
+ sdDetect.mode(PullUp);
+ wait(.001);
+
+ /* ================================
+ =========== Start Main Program ============
+ ================================
+ */
+ while(1) {
+ // ------------- No SD Card Detected -------------
+ // Current bug... When SD card is removed and replaced, stays in not detected loop... or something
+ myled = sdDetect;
+ myled2 = 0;
+ if(!sdDetect)
+ {
+ if(DEBUG) {
+ myled2 = 1 - myled2;
+ wait_ms(50);
+ }
+ sdInsert = false; // Note no card is inserted
+ if(playlistExist){
+ playlistExist = false;
+ deleteList(root);
+ curr = root;
+ }
+ lcd.cls();
+ lcd.printf("No SD Card!");
+ if(DEBUG) pc.printf("No SD card detected! Please insert one\n\r");
+ }
+ // ------------ SD Card Detected ------------
+ else {
+ // ---------- Set-up Playlist ----------
+ if(!sdInsert) {
+ // If first loop after inserting SD card
+ sdInsert = true;
+ songCount = createPlaylist("/sd/", root); // Create playlist from .wav files in "/sd/"
+ playlistExist = true; // A playlist now exists
+ firstList = true; // First time through playlist
+ curr = root; // Put current at root node
+ if(DEBUG) printList(root);
+ lcd.cls(); // Display number of songs found
+ lcd.printf("Songs found: %d", songCount);
+ }
+
+ // ----------------- Turn RPG Clockwise -----------------
+ if(rpg.dir() == 1) {
+ // If turned clockwise, see if increment is greater than threshold
+ if(rpgTick < rpgThresh){
+ rpgTick++; //if not increment and do nothing else
+ if(DEBUG) printf("rpgThresh: %d\r\n", rpgThresh);
+ }
+ else {
+ rpgTick = 0; // Clear rpg counter
+
+ if(firstList){ // If first time controlling just put display node song name
+ firstList = false;
+ lcd.cls();
+ lcd.printf("%s", curr->s_name);
+ }
+ else { // Otherwise increment if possible and display song name
+ if(curr -> next != NULL){
+ curr = curr -> next;
+ lcd.cls();
+ lcd.printf("%s",curr->s_name);
+ }
+ }
+ }
+ }
+ // ----------------- Turn RPG Counter Clockwise -----------------
+ else {
+ if(rpg.dir() == -1) {
+ // Check if increment is greater than threshold
+ if(rpgTick < rpgThresh) {
+ rpgTick++;
+ }
+ else {
+ rpgTick = 0; // Clear increment
+
+ if(!firstList ){ //if on song selection, decrement if possible and displays song name
+ if(curr -> prev != NULL){
+ curr = curr -> prev;
+ lcd.cls();
+ lcd.printf("%s",curr->s_name);
+ }
+ }
+ }
+ }
+ }
+ // ----------------- Press RPG Button -----------------
+ if(rpg.pb()) {
+ // if push button is pressed ... SOMETHING
+ lcd.cls();
+ lcd.printf("Song playing");
+
+ //Check sd card maybes
+
+ // File location name thing
+ mySongName.erase();
+ mySongName.append("/sd/");
+ mySongName.append(curr->s_name);
+ mySongName.append(".wav");
+
+ // Open File
+ if(DEBUG) printf("Appended Name: %s\n\r", mySongName.c_str());
+ wave_file=fopen(mySongName.c_str(),"r");
+
+ wave_file_check(wave_array, wave_file);
+ if(DEBUG) printf("Sample Rate: %d\r\n", wave_file_info.samples_per_second);
+ fclose(wave_file);
+
+ lcd.locate(0,1);
+ lcd.printf("Time: / sec");
+ lcd.locate(10,1);
+ lcd.printf("%d", (int)(wave_file_info.length_of_file / (wave_file_info.samples_per_second * wave_file_info.number_of_channels * wave_file_info.bytes_per_sample)) );
+
+
+ wave_file=fopen(mySongName.c_str(),"r");
+
+ songTick.attach(&songClock, 1.0);
+ set_time(1357020000);
+ time_i = time(NULL);
+
+ if(DEBUG) printf("Start Song\r\n");
+ waver.play(wave_file);
+
+ if(DEBUG) printf("Close Song!\r\n");
+ fclose(wave_file);
+
+ songTick.detach();
+ time_i = 0;
+
+ lcd.cls();
+ lcd.printf(curr->s_name);
+ if(DEBUG) printf("Finished mai SONG!\r\n");
+ }
+ if(DEBUG) printf("rpgTick: %d \r\n",rpgTick);
+ }
+ }
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Mon Mar 04 22:37:29 2013 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/3d0ef94e36ec \ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/wav_header.lib Mon Mar 04 22:37:29 2013 +0000 @@ -0,0 +1,1 @@ +wav_header#a50bba1964ec
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/wave_player.lib Mon Mar 04 22:37:29 2013 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/sravet/code/wave_player/#acc3e18e77ad