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Dependencies:   mbed FATFileSystem

WDplayer/WDplayer.cpp@11:7f3e9bc7366d, 2019-05-05 (annotated)

Committer:
rottenegg
Date:
Sun May 05 03:45:29 2019 +0000
Revision:
11:7f3e9bc7366d
Parent:
3:63cdd5cab431
Child:
12:ff8d26124c38
WDplayer: Added new ISR Ticker compatible Functions and updated Documents.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
rottenegg 2:964e19f2f3f1 1 #include "WDplayer.h"
rottenegg 11:7f3e9bc7366d 2 Ticker ISR;
rottenegg 2:964e19f2f3f1 3
rottenegg 3:63cdd5cab431 4 //Constructor
rottenegg 11:7f3e9bc7366d 5 WDplayer::WDplayer(PinName buzzer)
rottenegg 11:7f3e9bc7366d 6 : _dac(new PwmOut(buzzer)) {
rottenegg 3:63cdd5cab431 7 buffer = (unsigned char *)malloc(1);
rottenegg 3:63cdd5cab431 8 }
rottenegg 2:964e19f2f3f1 9
rottenegg 3:63cdd5cab431 10 //Deconstructor
rottenegg 3:63cdd5cab431 11 WDplayer::~WDplayer() {
rottenegg 3:63cdd5cab431 12 free(buffer);
rottenegg 11:7f3e9bc7366d 13 free(cache);
rottenegg 11:7f3e9bc7366d 14 delete _dac;
rottenegg 3:63cdd5cab431 15 }
rottenegg 3:63cdd5cab431 16
rottenegg 11:7f3e9bc7366d 17 void WDplayer::intWD(const char *path, bool allocate) {
rottenegg 3:63cdd5cab431 18 //Open File and Check
rottenegg 2:964e19f2f3f1 19 _fptr = fopen(path,"r");
rottenegg 2:964e19f2f3f1 20 if (_fptr == NULL) {
rottenegg 2:964e19f2f3f1 21 std::cerr << "Error File not Found" << std::endl;
rottenegg 2:964e19f2f3f1 22 }
rottenegg 3:63cdd5cab431 23 //Get Riff Information
rottenegg 2:964e19f2f3f1 24 unsigned int samplerate;
rottenegg 2:964e19f2f3f1 25 fseek(_fptr,24,SEEK_SET);
rottenegg 2:964e19f2f3f1 26 fread(&samplerate,4,1,_fptr);
rottenegg 2:964e19f2f3f1 27 fseek(_fptr,0,SEEK_END);
rottenegg 2:964e19f2f3f1 28 unsigned int len = ftell(_fptr);
rottenegg 3:63cdd5cab431 29 //Set Private Variables
rottenegg 2:964e19f2f3f1 30 _pwmfreq = (1.0f / samplerate);
rottenegg 2:964e19f2f3f1 31 _path = path;
rottenegg 2:964e19f2f3f1 32 _length = len - 44;
rottenegg 2:964e19f2f3f1 33 _fptr = NULL;
rottenegg 2:964e19f2f3f1 34 _tck = 0;
rottenegg 11:7f3e9bc7366d 35 lock = false;
rottenegg 11:7f3e9bc7366d 36 vtck = 8000;
rottenegg 11:7f3e9bc7366d 37 cache = NULL;
rottenegg 11:7f3e9bc7366d 38 _dac->period( _pwmfreq / 4.0f);
rottenegg 11:7f3e9bc7366d 39 if (allocate) {
rottenegg 11:7f3e9bc7366d 40 cache = (unsigned char*)std::calloc(8000,sizeof(unsigned char));
rottenegg 11:7f3e9bc7366d 41 }
rottenegg 2:964e19f2f3f1 42 };
rottenegg 2:964e19f2f3f1 43
rottenegg 11:7f3e9bc7366d 44 //Inline Functions (Operates using main MCU)
rottenegg 11:7f3e9bc7366d 45
rottenegg 11:7f3e9bc7366d 46 void WDplayer::WDplay() {
rottenegg 2:964e19f2f3f1 47 _fptr = fopen(_path,"r");
rottenegg 2:964e19f2f3f1 48 fseek(_fptr,44,SEEK_SET);
rottenegg 3:63cdd5cab431 49 //Sampling Loop- Sample Byte by Byte
rottenegg 3:63cdd5cab431 50 //CORE ENGINE
rottenegg 2:964e19f2f3f1 51 for (_tck = _length; _tck > 1; _tck--) {
rottenegg 2:964e19f2f3f1 52 fread(buffer,1,1,_fptr);
rottenegg 11:7f3e9bc7366d 53 _dac->write((float)buffer[0] / 255.00f);
rottenegg 2:964e19f2f3f1 54 wait(_pwmfreq / 2.0f); //I dont like this & Playback present here
rottenegg 2:964e19f2f3f1 55 }
rottenegg 2:964e19f2f3f1 56 _fptr = NULL;
rottenegg 2:964e19f2f3f1 57 _tck = 0;
rottenegg 2:964e19f2f3f1 58 };
rottenegg 2:964e19f2f3f1 59
rottenegg 11:7f3e9bc7366d 60 void WDplayer::WDtck() {
rottenegg 3:63cdd5cab431 61 //To Loop the Music File When it Ends
rottenegg 2:964e19f2f3f1 62 if (_fptr == NULL) {
rottenegg 2:964e19f2f3f1 63 _fptr = fopen(_path,"r");
rottenegg 2:964e19f2f3f1 64 fseek(_fptr,44,SEEK_SET);
rottenegg 2:964e19f2f3f1 65 }
rottenegg 3:63cdd5cab431 66 //Sampling If Statements
rottenegg 2:964e19f2f3f1 67 if (_tck == _length) {
rottenegg 2:964e19f2f3f1 68 _fptr = NULL;
rottenegg 2:964e19f2f3f1 69 _tck = 0;
rottenegg 2:964e19f2f3f1 70 } else {
rottenegg 3:63cdd5cab431 71 //Plays One Sample
rottenegg 2:964e19f2f3f1 72 fread(buffer,1,1,_fptr);
rottenegg 11:7f3e9bc7366d 73 _dac->write( (int)buffer[0] / 255.00 );
rottenegg 2:964e19f2f3f1 74 _tck++;
rottenegg 2:964e19f2f3f1 75 }
rottenegg 2:964e19f2f3f1 76 };
rottenegg 2:964e19f2f3f1 77
rottenegg 11:7f3e9bc7366d 78 //Outline Functions (Uses ISR to operate)
rottenegg 11:7f3e9bc7366d 79
rottenegg 11:7f3e9bc7366d 80 void WDplayer::ISRpreload() {
rottenegg 11:7f3e9bc7366d 81 //File Reset
rottenegg 11:7f3e9bc7366d 82 if (_fptr == NULL) {
rottenegg 11:7f3e9bc7366d 83 _fptr = fopen(_path,"r");
rottenegg 11:7f3e9bc7366d 84 fseek(_fptr,44,SEEK_SET);
rottenegg 11:7f3e9bc7366d 85 //Reset State and Locational Variables
rottenegg 11:7f3e9bc7366d 86 lock = false;
rottenegg 11:7f3e9bc7366d 87 vtck = 8000;
rottenegg 11:7f3e9bc7366d 88 _tck = 0;
rottenegg 11:7f3e9bc7366d 89 }
rottenegg 11:7f3e9bc7366d 90 //CORE ENGINE WRITING
rottenegg 11:7f3e9bc7366d 91 if (_tck + 4000 >= _length) {
rottenegg 11:7f3e9bc7366d 92 _fptr = NULL;
rottenegg 11:7f3e9bc7366d 93 _tck = 0;
rottenegg 11:7f3e9bc7366d 94 vtck = 0;
rottenegg 11:7f3e9bc7366d 95 } else if (vtck > 4001 && !lock) {
rottenegg 11:7f3e9bc7366d 96 //Block 1 Update
rottenegg 11:7f3e9bc7366d 97 for (int i = 0; i <= 4000; i++) {
rottenegg 11:7f3e9bc7366d 98 fread(buffer,1,1,_fptr);
rottenegg 11:7f3e9bc7366d 99 cache[i] = ((unsigned char)buffer[0]);
rottenegg 11:7f3e9bc7366d 100 }
rottenegg 11:7f3e9bc7366d 101 lock = true;
rottenegg 11:7f3e9bc7366d 102 _tck = _tck + 4000;
rottenegg 11:7f3e9bc7366d 103 } else if (vtck < 3999 && lock) {
rottenegg 11:7f3e9bc7366d 104 //Block 2 Update
rottenegg 11:7f3e9bc7366d 105 for (int i = 4001; i <= 8000; i++) {
rottenegg 11:7f3e9bc7366d 106 fread(buffer,1,1,_fptr);
rottenegg 11:7f3e9bc7366d 107 cache[i] = ((int)buffer[0]);
rottenegg 11:7f3e9bc7366d 108 }
rottenegg 11:7f3e9bc7366d 109 lock = false;
rottenegg 11:7f3e9bc7366d 110 _tck = _tck + 4000;
rottenegg 11:7f3e9bc7366d 111 }
rottenegg 11:7f3e9bc7366d 112 }
rottenegg 11:7f3e9bc7366d 113
rottenegg 11:7f3e9bc7366d 114 void WDplayer::ISRset() {
rottenegg 11:7f3e9bc7366d 115 this->ISRpreload();
rottenegg 11:7f3e9bc7366d 116 ISR.attach(callback(this,&WDplayer::ISRtck),_pwmfreq);
rottenegg 11:7f3e9bc7366d 117 }
rottenegg 11:7f3e9bc7366d 118
rottenegg 11:7f3e9bc7366d 119 void WDplayer::ISRreset() {
rottenegg 11:7f3e9bc7366d 120 free(cache);
rottenegg 11:7f3e9bc7366d 121 lock = false;
rottenegg 11:7f3e9bc7366d 122 vtck = 8000;
rottenegg 11:7f3e9bc7366d 123 _tck = 0;
rottenegg 11:7f3e9bc7366d 124 ISR.detach();
rottenegg 11:7f3e9bc7366d 125 }
rottenegg 11:7f3e9bc7366d 126
rottenegg 11:7f3e9bc7366d 127 void WDplayer::ISRtck() {
rottenegg 11:7f3e9bc7366d 128 _dac->write( cache[vtck] / 255.00 );
rottenegg 11:7f3e9bc7366d 129 if (vtck == 8000) {
rottenegg 11:7f3e9bc7366d 130 vtck = -1;
rottenegg 11:7f3e9bc7366d 131 }
rottenegg 11:7f3e9bc7366d 132 vtck++;
rottenegg 11:7f3e9bc7366d 133 };
rottenegg 11:7f3e9bc7366d 134
rottenegg 11:7f3e9bc7366d 135
rottenegg 2:964e19f2f3f1 136 float WDplayer::get_pwmfreq() {
rottenegg 2:964e19f2f3f1 137 return _pwmfreq;
rottenegg 2:964e19f2f3f1 138 };