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Dependencies:   mbed FATFileSystem

WDplayer/WDplayer.cpp@18:14e5391beccf, 2019-05-08 (annotated)

Committer:
rottenegg
Date:
Wed May 08 01:49:54 2019 +0000
Revision:
18:14e5391beccf
Parent:
17:7d4d8905b608
Child:
21:f3b0ce18b44f
CaMove: 20 line per Function criteria met

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 2:964e19f2f3f1 18 _fptr = fopen(path,"r");
rottenegg 3:63cdd5cab431 19 //Get Riff Information
rottenegg 2:964e19f2f3f1 20 unsigned int samplerate;
rottenegg 2:964e19f2f3f1 21 fseek(_fptr,24,SEEK_SET);
rottenegg 2:964e19f2f3f1 22 fread(&samplerate,4,1,_fptr);
rottenegg 2:964e19f2f3f1 23 fseek(_fptr,0,SEEK_END);
rottenegg 2:964e19f2f3f1 24 unsigned int len = ftell(_fptr);
rottenegg 3:63cdd5cab431 25 //Set Private Variables
rottenegg 2:964e19f2f3f1 26 _pwmfreq = (1.0f / samplerate);
rottenegg 2:964e19f2f3f1 27 _path = path;
rottenegg 2:964e19f2f3f1 28 _length = len - 44;
rottenegg 2:964e19f2f3f1 29 _fptr = NULL;
rottenegg 2:964e19f2f3f1 30 _tck = 0;
rottenegg 11:7f3e9bc7366d 31 lock = false;
rottenegg 12:ff8d26124c38 32 vtck = 4000;
rottenegg 11:7f3e9bc7366d 33 _dac->period( _pwmfreq / 4.0f);
rottenegg 11:7f3e9bc7366d 34 if (allocate) {
rottenegg 12:ff8d26124c38 35 cache = (unsigned char*)std::calloc(4000,sizeof(unsigned char));
rottenegg 11:7f3e9bc7366d 36 }
rottenegg 2:964e19f2f3f1 37 };
rottenegg 2:964e19f2f3f1 38
rottenegg 11:7f3e9bc7366d 39 //Inline Functions (Operates using main MCU)
rottenegg 11:7f3e9bc7366d 40
rottenegg 11:7f3e9bc7366d 41 void WDplayer::WDplay() {
rottenegg 2:964e19f2f3f1 42 _fptr = fopen(_path,"r");
rottenegg 2:964e19f2f3f1 43 fseek(_fptr,44,SEEK_SET);
rottenegg 3:63cdd5cab431 44 //Sampling Loop- Sample Byte by Byte
rottenegg 3:63cdd5cab431 45 //CORE ENGINE
rottenegg 2:964e19f2f3f1 46 for (_tck = _length; _tck > 1; _tck--) {
rottenegg 2:964e19f2f3f1 47 fread(buffer,1,1,_fptr);
rottenegg 11:7f3e9bc7366d 48 _dac->write((float)buffer[0] / 255.00f);
rottenegg 2:964e19f2f3f1 49 wait(_pwmfreq / 2.0f); //I dont like this & Playback present here
rottenegg 2:964e19f2f3f1 50 }
rottenegg 2:964e19f2f3f1 51 _fptr = NULL;
rottenegg 2:964e19f2f3f1 52 _tck = 0;
rottenegg 2:964e19f2f3f1 53 };
rottenegg 2:964e19f2f3f1 54
rottenegg 11:7f3e9bc7366d 55 void WDplayer::WDtck() {
rottenegg 3:63cdd5cab431 56 //To Loop the Music File When it Ends
rottenegg 2:964e19f2f3f1 57 if (_fptr == NULL) {
rottenegg 2:964e19f2f3f1 58 _fptr = fopen(_path,"r");
rottenegg 2:964e19f2f3f1 59 fseek(_fptr,44,SEEK_SET);
rottenegg 2:964e19f2f3f1 60 }
rottenegg 3:63cdd5cab431 61 //Sampling If Statements
rottenegg 2:964e19f2f3f1 62 if (_tck == _length) {
rottenegg 2:964e19f2f3f1 63 _fptr = NULL;
rottenegg 2:964e19f2f3f1 64 _tck = 0;
rottenegg 2:964e19f2f3f1 65 } else {
rottenegg 3:63cdd5cab431 66 //Plays One Sample
rottenegg 2:964e19f2f3f1 67 fread(buffer,1,1,_fptr);
rottenegg 11:7f3e9bc7366d 68 _dac->write( (int)buffer[0] / 255.00 );
rottenegg 2:964e19f2f3f1 69 _tck++;
rottenegg 2:964e19f2f3f1 70 }
rottenegg 2:964e19f2f3f1 71 };
rottenegg 2:964e19f2f3f1 72
rottenegg 11:7f3e9bc7366d 73 //Outline Functions (Uses ISR to operate)
rottenegg 11:7f3e9bc7366d 74
rottenegg 11:7f3e9bc7366d 75 void WDplayer::ISRpreload() {
rottenegg 11:7f3e9bc7366d 76 //File Reset
rottenegg 11:7f3e9bc7366d 77 if (_fptr == NULL) {
rottenegg 11:7f3e9bc7366d 78 _fptr = fopen(_path,"r");
rottenegg 11:7f3e9bc7366d 79 fseek(_fptr,44,SEEK_SET);
rottenegg 11:7f3e9bc7366d 80 //Reset State and Locational Variables
rottenegg 11:7f3e9bc7366d 81 lock = false;
rottenegg 12:ff8d26124c38 82 vtck = 4000;
rottenegg 11:7f3e9bc7366d 83 _tck = 0;
rottenegg 11:7f3e9bc7366d 84 }
rottenegg 11:7f3e9bc7366d 85 //CORE ENGINE WRITING
rottenegg 12:ff8d26124c38 86 if (_tck + 2000 >= _length) {
rottenegg 11:7f3e9bc7366d 87 _fptr = NULL;
rottenegg 11:7f3e9bc7366d 88 _tck = 0;
rottenegg 11:7f3e9bc7366d 89 vtck = 0;
rottenegg 12:ff8d26124c38 90 } else if (vtck > 2001 && !lock) {
rottenegg 17:7d4d8905b608 91 this->UpdateBlock1();
rottenegg 12:ff8d26124c38 92 } else if (vtck < 1999 && lock) {
rottenegg 17:7d4d8905b608 93 this->UpdateBlock2();
rottenegg 11:7f3e9bc7366d 94 }
rottenegg 11:7f3e9bc7366d 95 }
rottenegg 11:7f3e9bc7366d 96
rottenegg 17:7d4d8905b608 97 void WDplayer::UpdateBlock2() {
rottenegg 17:7d4d8905b608 98 //Block 2 Update
rottenegg 17:7d4d8905b608 99 for (int i = 2001; i <= 4000; i++) {
rottenegg 17:7d4d8905b608 100 fread(buffer,1,1,_fptr);
rottenegg 17:7d4d8905b608 101 cache[i] = ((int)buffer[0]);
rottenegg 17:7d4d8905b608 102 }
rottenegg 17:7d4d8905b608 103 lock = false;
rottenegg 17:7d4d8905b608 104 _tck = _tck + 2000;
rottenegg 17:7d4d8905b608 105 }
rottenegg 17:7d4d8905b608 106
rottenegg 17:7d4d8905b608 107 void WDplayer::UpdateBlock1() {
rottenegg 17:7d4d8905b608 108 //Block 1 Update
rottenegg 17:7d4d8905b608 109 for (int i = 0; i <= 2000; i++) {
rottenegg 17:7d4d8905b608 110 fread(buffer,1,1,_fptr);
rottenegg 17:7d4d8905b608 111 cache[i] = ((unsigned char)buffer[0]);
rottenegg 17:7d4d8905b608 112 }
rottenegg 17:7d4d8905b608 113 lock = true;
rottenegg 17:7d4d8905b608 114 _tck = _tck + 2000;
rottenegg 17:7d4d8905b608 115 }
rottenegg 17:7d4d8905b608 116
rottenegg 11:7f3e9bc7366d 117 void WDplayer::ISRset() {
rottenegg 11:7f3e9bc7366d 118 this->ISRpreload();
rottenegg 11:7f3e9bc7366d 119 ISR.attach(callback(this,&WDplayer::ISRtck),_pwmfreq);
rottenegg 11:7f3e9bc7366d 120 }
rottenegg 11:7f3e9bc7366d 121
rottenegg 12:ff8d26124c38 122 void WDplayer::ISRpause() {
rottenegg 12:ff8d26124c38 123 ISR.detach();
rottenegg 12:ff8d26124c38 124 }
rottenegg 12:ff8d26124c38 125
rottenegg 12:ff8d26124c38 126 void WDplayer::ISRresume() {
rottenegg 12:ff8d26124c38 127 ISR.attach(callback(this,&WDplayer::ISRtck),_pwmfreq);
rottenegg 12:ff8d26124c38 128 }
rottenegg 12:ff8d26124c38 129
rottenegg 11:7f3e9bc7366d 130 void WDplayer::ISRreset() {
rottenegg 11:7f3e9bc7366d 131 free(cache);
rottenegg 11:7f3e9bc7366d 132 lock = false;
rottenegg 12:ff8d26124c38 133 vtck = 4000;
rottenegg 11:7f3e9bc7366d 134 _tck = 0;
rottenegg 11:7f3e9bc7366d 135 ISR.detach();
rottenegg 11:7f3e9bc7366d 136 }
rottenegg 11:7f3e9bc7366d 137
rottenegg 11:7f3e9bc7366d 138 void WDplayer::ISRtck() {
rottenegg 11:7f3e9bc7366d 139 _dac->write( cache[vtck] / 255.00 );
rottenegg 12:ff8d26124c38 140 if (vtck == 4000) {
rottenegg 11:7f3e9bc7366d 141 vtck = -1;
rottenegg 11:7f3e9bc7366d 142 }
rottenegg 11:7f3e9bc7366d 143 vtck++;
rottenegg 11:7f3e9bc7366d 144 };
rottenegg 11:7f3e9bc7366d 145
rottenegg 11:7f3e9bc7366d 146
rottenegg 2:964e19f2f3f1 147 float WDplayer::get_pwmfreq() {
rottenegg 2:964e19f2f3f1 148 return _pwmfreq;
rottenegg 2:964e19f2f3f1 149 };